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Paessler PRTG alternatives: 6 apps ranked by verified data

Facts checked Nov 1, 2026AppBreakup editorialHow we rank

Common reasons people leave Paessler PRTG: the core server runs only on Windows, and sensor-based licences get expensive as networks grow. We ranked 6 alternatives by how directly each one replaces Paessler PRTG, then by reviews, real visits and how recently each app's facts were checked against its own website. Datadog currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Datadog logoDatadogFree plan + paidNoWeb, iOS, Android4 of 470.9
2Zabbix logoZabbixOpen sourceYesSelf-hosted, Linux, Web4 of 468.8
3Checkmk logoCheckmkFree plan + paidYesSelf-hosted, Linux, Web6 of 664.8
4Icinga logoIcingaOpen sourceYesSelf-hosted, Linux, Web3 of 359.4
5Site24x7 logoSite24x7PaidNoWeb, iOS, Android4 of 457.5
  1. Datadog logo

    1. DatadogTop pick

    Best for: Cloud-heavy teams that want metrics, traces, logs and alerts in one hosted product and can budget for it

    Free plan + paidWeb, iOS, Android

    70.9

    score / 100

    Why switch from Paessler PRTG

    A SaaS observability platform for teams also monitoring cloud apps, logs and traces.

    Pros

    • Very wide integration catalogue that works with little setup
    • Metrics, traces and logs are linked in one interface
    • Mature dashboards, monitors and on-call features

    Cons

    • Per-product, per-host pricing makes bills hard to forecast
    • Custom metrics and log volume get expensive quickly
    • No self-hosted option
    Visit Datadog Details and reviews
    How this score is calculated
    Editorial fit ×0.357
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Datadog a good Paessler PRTG alternative?

    Verified facts

    4 of 4 verified
    Starting price
    $15 per host/month (Infrastructure Pro, annual)
    Checked Oct 29, 2026datadoghq.com(opens source in a new tab)
    Free tier
    Up to 5 hosts, 1-day metric retention
    Checked Oct 25, 2026datadoghq.com(opens source in a new tab)
    Free trial
    14 days
    Checked Oct 29, 2026datadoghq.com(opens source in a new tab)
    Integrations
    1,000+
    Checked Oct 29, 2026datadoghq.com(opens source in a new tab)
  2. Zabbix logo

    2. Zabbix

    Best for: IT teams monitoring servers and network devices on-premises at scale without licence fees

    Open sourceSelf-hostableSelf-hosted, Linux, Web

    68.8

    score / 100

    Why switch from Paessler PRTG

    Free and open source with no sensor limits, and the server runs on Linux.

    Pros

    • Free with no per-device licence fees
    • Huge template library for devices and services
    • Scales to large estates with proxies

    Cons

    • Dense interface with a steep learning curve
    • Less suited to ephemeral containers
    • Self-hosting the database and server is on you
    Visit Zabbix Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Zabbix a good Paessler PRTG alternative?

    Verified facts

    4 of 4 verified
    License
    AGPL-3.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Licence change
    AGPLv3 from version 7.0
    Checked Oct 29, 2026zabbix.com(opens source in a new tab)
    Licence fees
    None
    Checked Oct 29, 2026zabbix.com(opens source in a new tab)
    Hosted option
    Zabbix Cloud
    Checked Oct 25, 2026zabbix.com(opens source in a new tab)
  3. Checkmk logo

    3. Checkmk

    Best for: IT teams with mixed server, network and cloud estates who want fast automatic setup

    Free plan + paidOpen sourceSelf-hostableSelf-hosted, Linux, Web

    64.8

    score / 100

    Why switch from Paessler PRTG

    Similar auto-discovery and ready-made checks, with a free open-source edition.

    Pros

    • Auto-discovery sets up checks with sensible thresholds
    • Rule-based web configuration
    • Free open-source community edition

    Cons

    • Best features are in paid editions
    • Rule system takes time to master
    • Server runs only on Linux
    Visit Checkmk Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Checkmk a good Paessler PRTG alternative?

    Verified facts

    6 of 6 verified
    License
    GPL-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Free edition
    Checkmk Community
    Checked Oct 29, 2026checkmk.com(opens source in a new tab)
    SaaS option
    Checkmk Cloud
    Checked Oct 29, 2026checkmk.com(opens source in a new tab)
    Starting price
    From €190 a month, billed annually (Pro)
    Checked Nov 1, 2026checkmk.com(opens source in a new tab)
    Ultimate plan
    From €275 a month, billed annually
    Checked Nov 1, 2026checkmk.com(opens source in a new tab)
    Free plan
    Yes, Checkmk Community
    Checked Nov 1, 2026checkmk.com(opens source in a new tab)
  4. Icinga logo

    4. Icinga

    Best for: Linux-savvy teams that want scriptable, distributed on-premises monitoring

    Open sourceSelf-hostableSelf-hosted, Linux, Web

    59.4

    score / 100

    Why switch from Paessler PRTG

    A modern open-source take on Nagios with a better web interface and an API.

    Pros

    • Compatible with Nagios check plugins
    • Clustering and REST API built in
    • Configuration works well with automation tools

    Cons

    • Requires solid Linux administration
    • Graphing needs extra components
    • Steeper setup than hosted tools
    Visit Icinga Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Icinga a good Paessler PRTG alternative?

    Verified facts

    3 of 3 verified
    License
    GPL-3.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Free edition
    Forever free, open source
    Checked Oct 29, 2026icinga.com(opens source in a new tab)
    Open source
    Yes
    Checked Oct 29, 2026icinga.com(opens source in a new tab)
  5. Site24x7 logo

    5. Site24x7

    Best for: Small IT teams and MSPs who want broad hosted monitoring at a low monthly price

    PaidWeb, iOS, Android

    57.5

    score / 100

    Why switch from Paessler PRTG

    A cloud-hosted option covering networks, servers and websites with no server to maintain.

    Pros

    • Covers websites, servers, networks, cloud and APM in one product
    • Low entry prices
    • MSP edition for managing client accounts

    Cons

    • Busy interface with many options
    • Each area is less deep than specialist tools
    • Add-on pricing can get complicated
    Visit Site24x7 Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Site24x7 a good Paessler PRTG alternative?

    Verified facts

    4 of 4 verified
    Web Uptime plan
    $9/month (annual), 25 websites
    Checked Oct 29, 2026site24x7.com(opens source in a new tab)
    Free trial
    30 days, no card
    Checked Oct 29, 2026site24x7.com(opens source in a new tab)
    Monitoring locations
    32 on Web Uptime
    Checked Oct 25, 2026site24x7.com(opens source in a new tab)
    Infrastructure Lite
    $9/month (annual), 2 servers
    Checked Oct 29, 2026site24x7.com(opens source in a new tab)

The best Paessler PRTG alternative for…

The highest-ranked app in this list for each need.

Datadog logo

Best Paessler PRTG alternative for most people

Datadog

A SaaS observability platform for teams also monitoring cloud apps, logs and traces.

Zabbix logo

Best Paessler PRTG alternative for a free option

Zabbix

Free and open source with no sensor limits, and the server runs on Linux.

Checkmk logo

Best Paessler PRTG alternative for a free plan you can upgrade

Checkmk

Similar auto-discovery and ready-made checks, with a free open-source edition.

Nagios logo

Best Paessler PRTG alternative for open source

Nagios

A long-standing open-source monitor with a huge plugin library for those happy to configure files.

Icinga logo

Best Paessler PRTG alternative for self-hosting

Icinga

A modern open-source take on Nagios with a better web interface and an API.

Zabbix logo

Best Paessler PRTG alternative for Linux

Zabbix

Free and open source with no sensor limits, and the server runs on Linux.

Site24x7 logo

Best Paessler PRTG alternative for iPhone and Android

Site24x7

A cloud-hosted option covering networks, servers and websites with no server to maintain.

Datadog logo

Best Paessler PRTG alternative for working in the browser

Datadog

A SaaS observability platform for teams also monitoring cloud apps, logs and traces.

Paessler PRTG alternatives: common questions

What is the best alternative to Paessler PRTG?

Datadog ranks first right now. A SaaS observability platform for teams also monitoring cloud apps, logs and traces. Zabbix and Checkmk follow it in our ranking.

Is there a free alternative to Paessler PRTG?

Yes. Datadog (free plan + paid), Zabbix (open source), Checkmk (free plan + paid) and Nagios (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Paessler PRTG?

Yes: Zabbix, Checkmk, Nagios and Icinga. Zabbix, Checkmk and Nagios can also be self-hosted.

Which Paessler PRTG alternatives work on Linux?

Zabbix, Checkmk, Nagios and Icinga run on Linux.

Why do people switch from Paessler PRTG?

The complaints we hear most: the core server runs only on Windows; sensor-based licences get expensive as networks grow; different licence sizes can't be combined on one server.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Paessler PRTG, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.