Is Checkmk or PostHog better?

Neither clearly leads. Checkmk starts at Free and PostHog at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Checkmk or PostHog?

Checkmk starts at Free and PostHog at Free.

Does Checkmk or PostHog run on more platforms?

Checkmk runs on Web. PostHog runs on Web, Ios, Android, Api.

Can I use Checkmk for free?

Both have a free tier, so you can try either at no cost before committing.

What is Checkmk best used for?

Checkmk is most often used for infrastructure monitoring, system observability, enterprise compliance monitoring. Of those, infrastructure monitoring and system observability are not what PostHog is typically brought in for.

What can Checkmk do that PostHog cannot?

PostHog covers Product analytics, Session recording, Feature flags, A/B testing.

Technology · head to head

Checkmk vs PostHog

Checkmk

Technology

Comprehensive IT monitoring, open and flexible

From: Free
Rated: -

Full review Website

PostHog

Technology

The single platform to analyze, test, observe, and deploy new features

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: Checkmk pricing calculated by service count, not hosts (approximately 30 services per host on average); PostHog the free tier covers 1M events, 5K web session recordings and 2.5K mobile recordings per month before usage-based billing starts
Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Checkmk and PostHog actually diverge.

Attributes where Checkmk and PostHog differ
Attribute	Checkmk	PostHog
Pricing model	subscription	usage-based
Platforms	Web	Web, Ios, Android, Api
Founded	Unknown	2020

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Technology).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Checkmk

Nothing recorded that PostHog does not also cover.

Only in PostHog

Product analytics
Session recording
Feature flags
A/B testing
Heatmaps
SQL access
Data warehouse
Apps platform

What people use each for

The jobs each tool is most often brought in to do.

Checkmk

Infrastructure monitoringnot PostHog
System observabilitynot PostHog
Enterprise compliance monitoringnot PostHog

PostHog

Product analyticsnot Checkmk
Feature experimentationnot Checkmk
User behavior trackingnot Checkmk
A/B testingnot Checkmk
Debug production issuesnot Checkmk

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Checkmk

Pricing calculated by service count, not hosts (approximately 30 services per host on average)
Professional support limited to 8-10 hours per week on base plans
Synthetic monitoring is separate add-on with per-test pricing

PostHog

The free tier covers 1M events, 5K web session recordings and 2.5K mobile recordings per month before usage-based billing starts
Accounts without a card on file are limited to 1 project; adding one raises it to 6
Data retention is 1 year until a card is added, which extends it to 7 years
Support is community-only until the account is on a paid plan
Error tracking is capped at 100K exceptions and surveys at 1500 responses per month on the free tier

Pricing, plan by plan

Checkmk

Free

Community (Self-Hosted)Free
- No cost, forever
- Up to ~100 hosts
- Basic infrastructure monitoring
Pro (Self-Hosted)$190/month
- Advanced analytics
- Reporting
- Distributed monitoring
Ultimate (Self-Hosted)$275/month
- Full-stack observability
- Advanced security compliance
- 10 hours x 5 days professional support (upgradable to 24/7)
CloudAI (SaaS)$240/month
- Fully managed cloud hosting
- 99.5% uptime SLA
- Supports up to 50000 services

PostHog

Free

FreeFree
- 1M events/month
- 5K sessions/month
- Unlimited users
Paid$undefined/month
- $0.00031/event
- $0.005/session
- Advanced permissions
Enterprise$undefined/month
- SAML SSO
- Advanced security
- Dedicated support

Which should you pick?

Choose Checkmk if

You want to start without paying.

Checkmk review

Choose PostHog if

You need product analytics.
You want to start without paying.
You work on Web, Ios, Android, Api.
You also want session recording.

PostHog review

Questions people ask

Is Checkmk or PostHog better?: Neither clearly leads. Checkmk starts at Free and PostHog at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Checkmk or PostHog?: Checkmk starts at Free and PostHog at Free.
Does Checkmk or PostHog run on more platforms?: Checkmk runs on Web. PostHog runs on Web, Ios, Android, Api.
Can I use Checkmk for free?: Both have a free tier, so you can try either at no cost before committing.
What is Checkmk best used for?: Checkmk is most often used for infrastructure monitoring, system observability, enterprise compliance monitoring. Of those, infrastructure monitoring and system observability are not what PostHog is typically brought in for.
What can Checkmk do that PostHog cannot?: PostHog covers Product analytics, Session recording, Feature flags, A/B testing.

Answered from the vendors’ own pages

Checkmk: Is there a free version of Checkmk?

Yes, Checkmk Community edition is free forever and supports up to approximately 100 hosts for basic infrastructure monitoring with no cost.

Source

PostHog: What does PostHog's free tier include per month?

PostHog free tier includes: 1M analytics events, 5K session replays, 1M feature flag requests, 100K error tracking exceptions, 1,500 survey responses, 1M data warehouse rows, 10K data pipeline events, 100K AI observability events, 500 PostHog AI credits, 10K workflow messages, and 10GB log ingestion. Source: https://posthog.com/pricing

Source

Checkmk: How does Checkmk calculate pricing by host count?

Checkmk uses service-based pricing where each monitored aspect (file system, hardware sensor, switch port, metric) counts as one service. On average, there are approximately 30 services per host.

Source

PostHog: How much data retention does PostHog provide on paid plans?

PostHog free tier provides 1-year data retention. Pay-as-you-go plans offer 7-year data retention across all projects, enabling longer historical analysis. Source: https://posthog.com/pricing

Source

Checkmk: What is the difference between Checkmk Pro and Ultimate tiers?

Pro tier at 190 EUR/month includes advanced analytics and 8x5 support, while Ultimate at 275 EUR/month adds full-stack observability, advanced compliance features, and upgradable 24/7 support.

Source

PostHog: What percentage of PostHog users stay on the free tier?

PostHog states that 97% of companies use PostHog for free, indicating extensive free tier adoption. However, specific per-unit pricing rates for overages on paid plans are not published. Source: https://posthog.com/pricing

Source

Checkmk: Does Checkmk offer a managed SaaS option?

Yes, Checkmk CloudAI is a fully managed SaaS tier at 240 EUR/month with 99.5% uptime SLA and support for up to 50000 services.

Source

PostHog: When does PostHog provide priority support on paid plans?

PostHog provides email or Slack support for accounts exceeding $2,000/month on pay-as-you-go plans. Specific response times and support SLAs are not detailed on their pricing page. Source: https://posthog.com/pricing

Source

Checkmk vs PostHog

Checkmk

PostHog

The short version

Where they differ

What each one covers

Only in Checkmk

Only in PostHog

What people use each for

Checkmk

PostHog

Where each one falls short

Checkmk

PostHog

Pricing, plan by plan

Checkmk

PostHog

Which should you pick?

Choose Checkmk if

Choose PostHog if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Checkmk

More on PostHog

Keep looking

Other head to heads