Buyer’s Guide - October 2026

The 10 best PRTG alternatives in 2027

Q: Can Zabbix replace PRTG?

Functionally, yes. Zabbix covers SNMP devices, servers, agents, and alerting at any scale with no license fee. The trade is complexity: setup, templates, dashboards, and database administration are manual, where PRTG automates them. Default polling is also minute-level rather than per-second, so short spikes can be missed.

Teams leave PRTG for three reasons: sensor-based licensing that balloons with monitoring depth, the move to subscription-only licensing, and a core server that only runs on Windows. This guide ranks 10 replacements on what actually decides the switch: network device depth, how the bill grows, and how much of your PRTG setup you have to rebuild.

Start with Netdata Jump to rankings

The 10 best PRTG alternatives in 2027 product interface

Why this list exists

PRTG earned its reputation honestly: install a Windows service, run auto-discovery, and within hours you have sensors polling switches, servers, and applications with maps your whole team understands. For SMB and mid-market IT teams it was often the default answer to “how do we monitor everything.”

The reasons teams leave are equally concrete. Every check is a licensed sensor, so the bill grows with monitoring depth rather than estate size, and G2 reviewers regularly flag sensor licensing becoming expensive at scale. Paessler ended perpetual licenses in July 2024 and moved to subscription-only, with users reporting sharply higher renewals. The core server runs only on Windows, and scaling past a single server means deploying remote probes and balancing them by hand.

What you give up by moving is real: the wizard-driven setup, the sensor library, the maps, and the single-appliance mental model. Every alternative to PRTG requires rebuilding sensors, maps, and notification rules from scratch. Nothing imports a PRTG configuration.

Three dimensions decide which replacement fits:

Licensing axis. PRTG counts sensors. Alternatives count nodes, devices, services, hosts, or ingested volume, and open-source tools count nothing but charge you in operations time. Pick the axis that stays predictable as you add monitoring depth, not the one with the lowest sticker today.
Network device depth versus infrastructure breadth. If your estate is hundreds of switches and routers, SNMP auto-discovery and vendor templates matter most (LibreNMS, Zabbix, OpManager). If it is mostly servers, containers, and applications, per-second telemetry and anomaly detection matter more than another SNMP poller.
Deployment model. If Windows-only was a reason to leave, check where the server component runs and whether SaaS is acceptable. Air-gapped and sovereignty-sensitive estates need self-hosted options.

One note on pricing: we do not quote list prices. Every alternative licenses on a different axis, so headline numbers are meaningless without your device and check counts, and vendor pricing pages change. Each card describes how the bill grows and links the official pricing page so you can model your own estate. For the head-to-head on the incumbent, see our detailed Netdata vs PRTG comparison.

The shortlist was assembled from the tools practitioners actually recommend when PRTG comes up: recurring picks across r/sysadmin and r/networking threads on PRTG’s price increase and open-source replacements, competitor roundups from Faddom, Motadata, and Obkio, and each vendor’s own licensing and product documentation. Tools that only monitor cloud applications or only do uptime checks were excluded; every entry can credibly take over a meaningful slice of a PRTG deployment.

Weighting reflects why teams actually leave. Network device monitoring depth carries the most weight because SNMP polling and device discovery are PRTG’s core use case. Licensing and cost predictability is second because it is the most-cited reason for switching, followed by deployment flexibility (the Windows-only core complaint) and scalability. Modern observability signals are weighted low deliberately: most teams leaving PRTG are buying a network and infrastructure monitor first.

Tester credit

Compiled by the Netdata team - Updated October 14, 2026

Sources verified

Scoring criteria

Network device monitoring depth 25%
SNMP polling, auto-discovery, traps, hardware health
Licensing and cost predictability 20%
Which axis the bill grows on
Deployment flexibility 15%
Server OS, on-prem vs SaaS, air-gapped options
Scalability and distributed monitoring 15%
Pollers, probes, agents at thousands of devices
Ease of setup and migration from PRTG 10%
Auto-discovery, what must be rebuilt
Alerting and notification quality 10%
Thresholds, anomalies, escalation
Modern observability coverage 5%
Per-second metrics, logs, traces, ML

Vendor 01 / 10 · #netdata

Netdata

Real-time infrastructure monitoring with per-second metrics, logs, traces, and on-node machine learning, priced per node instead of per sensor.

Best for

Teams replacing PRTG’s server and infrastructure monitoring with per-second visibility and no per-check licensing
Hybrid and cloud-native estates that want anomaly detection without hand-tuned thresholds
Organizations that want telemetry stored on their own infrastructure

Pricing

Per-node pricing: Netdata Cloud Business starts at $4.5/node/month on annual plans, and the per-node price decreases as node count grows
Not billed: metrics volume, Logs Monitoring (querying logs in place), users, data retention, containers
Agents are open source (GPLv3+) and self-hosted; you run and operate them yourself
Community plan is free for personal, non-commercial use with up to 5 active connected nodes; businesses use the Agent or Cloud Business (14-day trial)

Pros

Per-second collection on every node, versus PRTG’s sensor polling intervals, so short spikes are visible instead of averaged away
Unsupervised ML runs on each node for every metric; anomaly detection adapts as infrastructure changes and raw telemetry never leaves the host
One agent collects metrics, logs (systemd-journal, Windows Event Log, macOS unified logs queried in place, plus OpenTelemetry collection), and OpenTelemetry traces over OTLP
SNMP device auto-discovery with 100+ vendor profiles, SNMP traps, LLDP/CDP topology maps, and NetFlow/sFlow/IPFIX flow analysis
Auto-generated dashboards plus custom dashboards, with hundreds of preconfigured collectors and alerts
Runs on Linux, Windows, macOS, FreeBSD and edge devices; agents stream to parents or Netdata Cloud for a fleet view

Honest limitations

The 100+ vendor device profiles cover common hardware plus BGP, LLDP and CDP, but LibreNMS and Zabbix have broader template libraries for uncommon devices and deep vendor MIBs (OSPF, EIGRP, MPLS)
Network configuration and change management (config backup, diff, compliance) is out of scope; pair with a dedicated NCM tool if you need it
Viewing logs in the dashboard requires a Netdata Cloud sign-in

Verdict

Netdata removes the two things that drive most PRTG exits: per-check licensing and polling-interval blindness. The bill grows with node count, not with how finely you monitor, and every node collects per-second metrics with anomaly detection already running. The honest caveat is for pure network teams: if your PRTG deployment is mostly switch and router templates for uncommon hardware, LibreNMS, Zabbix, or OpManager cover that niche deeper. For the server, container, and application side of a PRTG estate, Netdata is the strongest replacement on this list.

Start monitoring with Netdata -> See Netdata vs PRTG ->

Vendor 02 / 10 · #zabbix

Zabbix

The most-cited open-source PRTG replacement: enterprise-grade monitoring of networks, servers, and applications with no license fee.

Best for

Teams that want a self-hosted PRTG replacement and can invest in setup and administration
Large, heterogeneous estates needing deep SNMP and agent coverage
Organizations with in-house monitoring expertise or air-gapped requirements

Pricing

Open source under AGPLv3 (since Zabbix 7.0); no license fee and no feature gating
Vendor revenue comes from optional tiered support subscriptions and Zabbix Cloud, billed by monitored capacity (NVPS)
You run and operate the server, database, and poller infrastructure yourself

Pros

Broad SNMP, IPMI, agent, and agentless coverage with thousands of community templates; the most-recommended PRTG alternative on r/sysadmin
Distributed monitoring with proxies scales to very large environments
No per-sensor or per-node billing; the bill does not grow with monitoring depth
Server component runs on Linux, removing PRTG’s Windows-only constraint
Actively developed, with Zabbix 7.4 adding low-level discovery and visualization features

Cons

Steep setup and administration curve; Reddit threads repeatedly call it powerful but complex versus PRTG’s installer-driven setup
Dashboards and alert workflows need manual configuration; nothing like PRTG’s auto-generated sensor views
Default polling is minute-level, so short spikes can be missed
Database sizing, upgrades, and HA are your operations burden

Verdict

Moving from PRTG to Zabbix trades license cost for engineering time. Functionally it covers everything PRTG does at any scale, and it is the strongest open-source answer on this list. Budget a real implementation project: templates, dashboards, and alert rules are built, not discovered. Teams that found PRTG expensive but easy should be honest about which half of that sentence bothered them more.

Read full Netdata vs Zabbix -> Zabbix pricing ->

Vendor 03 / 10 · #opmanager

ManageEngine OpManager

The most direct commercial PRTG competitor: network and server monitoring with device-based licensing and a similar workflow.

Best for

PRTG users who want the same sensor-style workflow with device-based licensing instead of sensor counting
Windows-centric IT teams that want an on-prem, appliance-like monitoring experience
Network admins who need flow analysis, firewall log, and switch/port management add-ons

Pricing

Device-based licensing: you license the number of devices, with unlimited interfaces, disk volumes, and sensors per device
Editions (Standard, Professional, Enterprise) plus paid add-ons for firewall, bandwidth, and flow analysis grow the bill as you extend coverage
On-premises software with annual maintenance; MSP edition available

Pros

Device-based licensing removes PRTG’s per-sensor counting anxiety; interfaces and volumes are unlimited per device
Deep network monitoring: SNMP discovery, switch port management, NetFlow, and firewall monitoring
Runs on Windows and Linux, familiar to PRTG administrators; described on r/sysadmin as the most direct competitor to PRTG and SolarWinds
Add-on ecosystem covers adjacent needs (NCM, OpUtils, firewall logs)

Cons

Add-on pricing means the bill grows as you extend beyond core network monitoring
Same on-prem server administration model as PRTG; scaling still means managing multiple servers and probes
Windows-first heritage; less at home in cloud-native estates
Minute-level polling, not per-second telemetry

Verdict

OpManager is the lowest-friction exit from PRTG: similar workflow, similar feature set, similar admin experience, but the license counts devices instead of sensors. That makes it the easiest migration on this list and the least transformative. If the goal is to stop counting sensors without rethinking the stack, this is the pick; if the goal is to modernize, look higher up the list.

Read full Netdata vs OpManager -> OpManager pricing ->

Vendor 04 / 10 · #checkmk

Checkmk

Open-core infrastructure monitoring with strong auto-discovery and agent-based checks, positioned as a direct PRTG-class alternative.

Best for

Teams that liked PRTG’s auto-discovering, all-in-one approach but want a Linux server and agent-based depth
Mixed estates of servers, network devices, and applications at large scale
Buyers who want a commercial vendor with an open-source fallback edition

Pricing

Open core: the Community edition is open source under GPLv2 and self-hosted; you operate it yourself
Commercial editions (Ultimate self-managed, Cloud SaaS) are priced by the number of monitored services and custom metrics, so the bill grows with the estate
Cloud edition is a hosted SaaS on AWS in EU and US regions

Pros

Automatic host discovery and thousands of bundled check plugins: the closest workflow to PRTG’s sensor model among open-source tools
Distributed monitoring scales to 100,000+ hosts in the Ultimate edition
Genuine open-source Community edition alongside commercial editions
Synthetic monitoring add-on and application observability in commercial editions

Cons

Advanced features (synthetic monitoring, some scalability and support features) sit in paid editions
The check-based model still requires rule and threshold administration, more hands-on than PRTG’s wizards
Check intervals are typically minutes rather than per-second
Commercial pricing is opaque and quoted per service and metric count

Verdict

Checkmk is the middle path between PRTG and a build-it-yourself stack: auto-discovery and bundled checks give a PRTG-like start, while the commercial editions add the polish and scale. Moving from PRTG means rebuilding checks as rules, but discovery does much of the inventory work. Watch the service-count pricing axis; it is friendlier than sensor counting but still rewards trimming check depth.

Read full Netdata vs Checkmk -> Checkmk pricing ->

Vendor 05 / 10 · #librenms

LibreNMS

Community-driven, fully open-source network monitoring with SNMP auto-discovery, the closest self-hosted match to PRTG’s device-discovery workflow.

Best for

Network-focused teams replacing PRTG’s SNMP device monitoring with a self-hosted open-source tool
MSPs and multi-site networks that need distributed pollers without license costs
Teams comfortable with Linux and PHP/MySQL administration and community support

Pricing

Open source under GPLv3; a community project with no paid edition and no feature gating
Optional commercial support from third parties
Real costs are the poller and database infrastructure plus administration time

Pros

Automatic SNMP device discovery and extensive device support, directly comparable to PRTG’s network coverage
Distributed poller architecture for scale-out deployments
Fully open source with no license fees or gated features
Supports 1-minute polling for faster network resolution, with an SNMP trap handler and alerting rules built in

Cons

Network-device centric: server and application monitoring depth is thin compared with PRTG or Zabbix
Community support model; no vendor SLA unless you buy third-party support
Web UI and alerting are functional but dated next to modern platforms
You operate the LAMP-style stack, upgrades, and database tuning

Verdict

LibreNMS is the best open-source stand-in for the network-device half of PRTG: discovery, SNMP polling, traps, and distributed pollers. Migration from PRTG is fast for switches and routers because discovery rebuilds the inventory itself. It does not replace PRTG’s server and application sensor library, so many teams pair it with an infrastructure monitor rather than asking it to be one.

Read full Netdata vs LibreNMS -> LibreNMS site ->

Vendor 06 / 10 · #datadog

Datadog

Cloud observability platform covering infrastructure, network devices, APM, logs, and synthetics, for teams modernizing beyond PRTG.

Best for

Cloud-native and hybrid organizations that want infrastructure plus APM, logs, and synthetics in one SaaS
Teams leaving PRTG who also want deep application performance monitoring and continuous profiling
Enterprises with budget headroom that prefer zero monitoring infrastructure to operate

Pricing

Modular usage-based pricing: per-host for infrastructure, per-device for SNMP network device monitoring, per-GB for logs, per-seat and per-feature for APM and other modules
The bill grows with hosts, devices, log volume, retention, and every module switched on; costs are notoriously hard to forecast at scale
SaaS only; no self-hosted option

Pros

Network Device Monitoring covers switches, routers, and firewalls over SNMP with interface and hardware health metrics
Broadest observability scope on this list: 900+ integrations, APM, continuous profiling, RUM, synthetics, logs
Fully managed SaaS with fast deployment and strong dashboards and alerting
Mature anomaly detection and machine-learning features

Cons

Modular usage-based pricing is frequently the top complaint in reviews; a multi-signal estate can cost far more than the PRTG bill you left
SaaS only: data leaves your infrastructure, a blocker for air-gapped or strict-sovereignty environments
SNMP device monitoring is a paid add-on priced per device, so large network estates add up
Agents must be deployed and managed across the fleet

Verdict

Datadog is the modernization path out of PRTG: it covers the network use case and then adds the application-layer depth PRTG never had. The risk is repeating the licensing complaint on a new axis. Teams fleeing an unpredictable sensor bill should model hosts, devices, log volume, and modules carefully before committing, because usage-based SaaS bills surprise in the same way, just later and larger.

Read full Netdata vs Datadog -> Datadog pricing ->

Vendor 07 / 10 · #icinga

Icinga

Vendor-neutral open-source monitoring framework with flexible APIs and modules, popular with teams leaving PRTG for a Linux-native stack.

Best for

Engineering-led teams that want a configurable, API-driven monitoring framework rather than an appliance
Hybrid environments needing custom checks and integration with config-management pipelines
MSPs that want predictable costs with no per-host licensing

Pricing

Open source under GPLv2 (Icinga 2 core and Web); no per-host or per-client license fees
Vendor revenue comes from optional module subscriptions and support subscriptions (8x5 or 24x7)
You run and operate the stack; cluster and database infrastructure are your cost

Pros

API-first architecture that integrates with configuration management and deployment pipelines
Distributed monitoring via zones and satellites
Genuinely open source with no per-host fees; the vendor positions it explicitly for MSP cost predictability
Large module ecosystem (Director, reporting, Grafana integration) and an active community

Cons

A framework, not an appliance: significant configuration work versus PRTG’s wizards (Icinga Director helps)
Enterprise modules carry annual subscription costs
Check-based polling at minute-level intervals, not per-second telemetry
No built-in log or trace pipeline; it monitors, it does not do observability

Verdict

Icinga suits teams whose real complaint about PRTG was rigidity, not just price. Moving from PRTG means expressing your sensors as check configuration, ideally driven by automation, which is liberating for engineering-led teams and painful for IT generalists. If your PRTG instance was maintained by one sysadmin with wizards, Icinga will feel like a step backward in day-to-day ease even though the license math is better.

Read full Netdata vs Icinga -> Icinga pricing ->

Vendor 08 / 10 · #grafana-prometheus

Grafana + Prometheus (Grafana stack)

The open-source observability stack: Prometheus metrics, Grafana dashboards, Loki logs, and Tempo traces, assembled by your team.

Best for

Engineering teams with Kubernetes and cloud-native estates and the skills to run the components
Organizations standardizing on OpenTelemetry and open standards
Teams that want full control of dashboards and data with no per-sensor or per-node licensing

Pricing

Open source components (Prometheus, Grafana, Loki, Tempo) you run and operate yourself; no license fees
Grafana Cloud SaaS is usage-based (host hours, container hours, telemetry volume) with a limited free tier and a platform fee; enterprise commits carry annual minimums
Real costs are infrastructure, storage sizing, and the engineering time to assemble and maintain the stack

Pros

Industry-standard metrics stack with the largest dashboard and visualization ecosystem
Full observability coverage when assembled: metrics, logs, traces, and synthetic monitoring via Grafana Cloud
No license fees for the self-managed stack; Grafana Cloud has a free tier for small use
Recommended on r/sysadmin as the go-to for teams comfortable with self-assembly

Cons

Not a product: discovery, alerting rules, dashboards, and retention must be built and maintained; nothing like PRTG’s sensor library
Weak fit for traditional SNMP device monitoring without add-ons; the SNMP exporter is basic
Pull-based scraping at 15-60s intervals misses per-second spikes
Self-managed operation burden (storage, federation, upgrades) is significant

Verdict

As a PRTG replacement, the Grafana stack is a category shift, not a swap. It is excellent for cloud-native infrastructure and poor at the SNMP device discovery that anchors most PRTG installs. Choose it when the team, not the tool, should own the monitoring logic, and when nobody on that team will miss maps, wizards, and auto-discovery.

Read full Netdata vs Grafana -> Grafana pricing ->

Vendor 09 / 10 · #solarwinds

SolarWinds Network Performance Monitor

Enterprise network monitoring with deep SNMP and NetFlow coverage, now subscription-licensed per node.

Best for

Large enterprise network teams needing deep SNMP, NetFlow, and multi-vendor device coverage
Organizations already standardized on SolarWinds modules
Teams with dedicated monitoring administrators who need mature reporting and capacity planning

Pricing

Per-node subscription licensing with tiers based on monitored entities (nodes, interfaces, volumes)
SolarWinds is transitioning its perpetual base globally to subscription, with multi-year contracts billed annually
The bill grows with node count and with each added module (NetFlow Traffic Analyzer, Server and Application Monitor, and others)

Pros

Very deep network monitoring: SNMPv2/v3, NetFlow, CBQoS, multi-vendor device support
Mature ecosystem of add-on modules covering servers, applications, storage, and logs
Scalable distributed Orion architecture with additional polling engines
Strong reporting, capacity planning, and network atlas features comparable to PRTG’s maps

Cons

The subscription transition with mandatory multi-year contracts has drawn heavy criticism on r/Solarwinds; costs rose sharply for existing customers
The Orion platform runs on Windows Server and carries a heavy administration footprint
Per-node plus per-module licensing makes total cost hard to predict as coverage expands
The 2020 Orion supply-chain incident still weighs on buyer trust

Verdict

Functionally, NPM is the deepest network monitor on this list. Strategically, moving from PRTG to SolarWinds repeats the pattern most leavers are escaping: a Windows Server platform, a forced perpetual-to-subscription transition, and a bill that grows on multiple axes. It earns its place for enterprises whose NetFlow and multi-vendor requirements genuinely outweigh licensing predictability, and few others.

Read full Netdata vs SolarWinds -> SolarWinds pricing ->

Vendor 10 / 10 · #nagios-xi

Nagios XI

The commercial edition of the classic Nagios engine: host and service checks with wizards, dashboards, and per-node perpetual licensing.

Best for

Teams that want the proven Nagios check model with a web UI and commercial support
Buyers who prefer perpetual licensing over subscriptions
Environments where per-node licensing matches their growth pattern

Pricing

Perpetual license priced by the number of monitored nodes, with no limit on services or checks per licensed node
Optional support contract; add-ons and wizards extend coverage
On-premises software on a Linux server

Pros

Per-node licensing with unlimited services per node, a simpler model than PRTG’s sensor counting
90+ configuration wizards and auto-discovery reduce the classic Nagios configuration burden
Massive community check ecosystem inherited from Nagios Core; existing Core configs migrate into XI
Multi-tenancy, REST API, dashboards, and reporting built in

Cons

Aging architecture: check-based polling at minute-level intervals, no per-second telemetry, logs, or traces
UI and workflow feel dated next to modern platforms
The perpetual license plus support model means recurring upgrade and support costs over time
Scaling large estates requires add-ons and careful planning

Verdict

Nagios XI is the conservative exit from PRTG: familiar host-and-service concepts, a license that counts nodes rather than checks, and perpetual terms for teams burned by subscription shifts. Moving from PRTG means rebuilding checks through wizards rather than auto-generated sensors. It buys stability and license simplicity at the cost of any modern observability capability, which makes it a fit for risk-averse estates rather than ambitious ones.

Read full Netdata vs Nagios -> Nagios XI licensing ->

Frequently asked questions

What is the best PRTG alternative in 2027?

There is no single best; the right pick depends on whether your priority is network device discovery, cost predictability, or modern observability. Netdata ranks first for per-second collection, on-node ML anomaly detection, and per-node pricing that replaces sensor counting. Zabbix is the strongest open-source breadth option, OpManager the most like-for-like commercial swap, LibreNMS the best pure network device monitor, and Datadog the cloud-native observability play.

Is there a free or open-source PRTG alternative?

Several. Zabbix (AGPLv3), Checkmk Community (GPLv2), LibreNMS (GPLv3), Icinga (GPLv2), and the Grafana/Prometheus stack are all open source and self-hosted. Open source is a distribution model, not a price: you run the servers, databases, and upgrades yourself, and that operating cost is real. Netdata’s agent is open source (GPLv3+) and its Community plan is free for personal, non-commercial use with up to 5 active connected nodes; businesses use the open-source Agent or Netdata Cloud Business.

Why are teams leaving PRTG?

Four reasons come up consistently. Sensor-based licensing grows expensive and unpredictable as environments scale, since every check is a licensed sensor. Paessler ended perpetual licenses in July 2024 and moved to subscription-only, with users reporting sharply higher renewals. The core server runs only on Windows, which conflicts with Linux-first estates. And scaling requires deploying multiple probes with manual balancing, with performance degrading in large deployments.

How does PRTG pricing compare to alternatives?

PRTG licenses by sensor count on a subscription, and sensors multiply quickly because each interface, disk, or service check can be its own sensor. Alternatives license on different axes: Netdata per node, OpManager per device, SolarWinds per node on multi-year subscription, Datadog usage-based per host, device, and ingested volume, Nagios XI per node perpetual, and open-source tools with no license fee but real operating costs. Compare what makes each bill grow rather than headline prices, and model your estate against each vendor’s pricing page.

Which PRTG alternative is best for network device monitoring (SNMP)?

LibreNMS, Zabbix, OpManager, and SolarWinds have the deepest SNMP auto-discovery and device coverage. Datadog offers Network Device Monitoring as a paid per-device add-on. Netdata covers SNMP devices with auto-discovery, 100+ vendor profiles, SNMP traps, LLDP/CDP topology maps, and flow analysis, but its device template library is narrower than the long-established NMS tools for uncommon hardware, an honest limitation for pure network teams.

Can Zabbix replace PRTG?

Is Netdata a good PRTG alternative?

Yes for server, container, application, and uptime monitoring: per-second metrics, logs, traces, on-node ML anomaly detection, and per-node pricing that does not grow with check depth. Honest limits: the device template library is narrower than long-established NMS tools for uncommon hardware, network configuration management is out of scope, and viewing logs in the dashboard needs a Netdata Cloud sign-in. It fits best when the estate is servers and cloud infrastructure; pure switch and router estates may prefer LibreNMS or OpManager.

How hard is it to migrate from PRTG?

Nothing migrates directly: PRTG sensors, maps, and notification rules must be rebuilt in every alternative. OpManager is the lowest-friction move with a similar Windows-friendly workflow; Zabbix and Checkmk need template and rule setup; LibreNMS re-discovers SNMP devices quickly on its own. Plan a parallel-run period: deploy the new tool alongside PRTG, rebuild critical checks first, then cut over notifications.

What is the difference between sensor-based and per-node licensing?

Sensor-based licensing counts every individual check, so costs scale with how finely you monitor. Per-node licensing (Netdata, Nagios XI, SolarWinds) counts each monitored machine or device once regardless of how many metrics or checks you run. Usage-based licensing (Datadog, Grafana Cloud) follows ingested data volume or host hours. The licensing axis determines whether adding monitoring depth raises the bill, which is the question most PRTG leavers are actually asking.

The 10 best PRTG alternatives in 2027

How we evaluated PRTG alternatives

Netdata

Zabbix

ManageEngine OpManager

Checkmk

LibreNMS

Datadog

Icinga

Grafana + Prometheus (Grafana stack)

SolarWinds Network Performance Monitor

Nagios XI

Frequently asked questions

Book Your Free Demo