What is the difference between PostHog and Countly?

PostHog is best for Product teams that need analytics, session replay, and feature flags in one tool, while Countly is best for Mobile app teams wanting open-source analytics. PostHog starts at Free and Countly starts at Free.

Is PostHog or Countly cheaper?

PostHog starts at Free and is free. Countly starts at Free and is free.

Is there a free alternative to Countly?

Both PostHog and Countly offer free tiers.

PostHog vs Countly

PostHog is open-source product analytics suite with session replay, feature flags, A/B testing, and surveys, while Countly is open-source product analytics for mobile, web, and desktop with crash reporting. PostHog is built for product teams that need analytics, session replay, and feature flags in one tool, whereas Countly targets mobile app teams wanting open-source analytics.

At a glance

	PostHog	Countly
Best for	Product teams that need analytics, session replay, and feature flags in one tool	Mobile app teams wanting open-source analytics
Starting price	Free	Free
Free tier	✓	✓
Open source	✓	✓
Free tier available	✓	✓
Open source	✓	✓
A/B Testing	✓	—
Crash Reports	—	✓
Feature Flags	✓	—
Mobile Analytics	—	✓
Product Analytics	✓	—
Push Notifications	—	✓
Session Replay	✓	—
Surveys	✓	✓

PostHog

Strengths

All-in-one: analytics, session replay, feature flags, A/B tests
Generous free tier (1M events/mo)
Open source and self-hostable
Strong developer experience

Weaknesses

Can be overwhelming — lots of features
Self-hosting requires significant infrastructure
UI has a learning curve
Some features less mature than best-in-class alternatives

Try PostHog → Full review

Countly

Strengths

Open source and transparent
Includes Mobile Analytics as a core feature, purpose-built for analytics workflows
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Fewer built-in features means you may need additional tools to cover gaps
Data accuracy depends on tracking setup — misconfigured events give misleading results

Try Countly → Full review

The bottom line

Pricing: Both PostHog and Countly are free, so this decision comes down to features and philosophy rather than budget.

Feature gaps: PostHog offers A/B Testing, Feature Flags and Product Analytics that Countly lacks. Countly brings Crash Reports, Mobile Analytics and Push Notifications that PostHog does not have. Both share Surveys.

Team fit: PostHog is geared toward any size teams, while Countly is aimed at mid-size teams teams. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

Open source: Both PostHog and Countly are open source, so self-hosting and code audits are on the table with either choice.

Where each tool shines: PostHog's biggest strengths are: all-in-one: analytics, session replay, feature flags, a/b tests. generous free tier (1m events/mo). Countly's biggest strengths are: open source and transparent. includes mobile analytics as a core feature, purpose-built for analytics workflows.

Watch out for: With PostHog, users commonly note that can be overwhelming — lots of features. With Countly, the main complaint is that may lack some advanced features.

Choose PostHog if...

You need a tool built for product teams that need analytics, session replay, and feature flags in one tool
You specifically need A/B Testing and Feature Flags
You care about generous free tier (1m events/mo)
Your team size fits the any size profile PostHog is designed for

Choose Countly if...

You need a tool built for mobile app teams wanting open-source analytics
You specifically need Crash Reports and Mobile Analytics
You care about includes mobile analytics as a core feature, purpose-built for analytics workflows
Your team size fits the mid-size teams profile Countly is designed for