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

#	App	Pricing	Open source	Platforms	Verified facts	Score
1	Datadog	Free plan + paid	No	Web, iOS, Android	4 of 4	70.9
2	Site24x7	Paid	No	Web, iOS, Android	4 of 4	57.5

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. 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.

Best Paessler PRTG alternative for most people

Datadog

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

Best Paessler PRTG alternative for a free option

Zabbix

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

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.

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.

Best Paessler PRTG alternative for self-hosting

Icinga

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

Best Paessler PRTG alternative for Linux

Zabbix

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

Best Paessler PRTG alternative for iPhone and Android

Site24x7

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

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.