What is the difference between PostHog and Amplitude?

PostHog is best for Product teams that need analytics, session replay, and feature flags in one tool, while Amplitude is best for Growth teams needing advanced product analytics. PostHog starts at Free and Amplitude starts at Free.

Is PostHog or Amplitude cheaper?

PostHog starts at Free and is free. Amplitude starts at Free with a free tier.

Is there a free alternative to Amplitude?

Both PostHog and Amplitude offer free tiers.

PostHog vs Amplitude

PostHog is open-source product analytics suite with session replay, feature flags, A/B testing, and surveys, while Amplitude is digital analytics platform for understanding user behavior across the full product journey. PostHog is open source and can be self-hosted, giving you full control over your data. PostHog is built for product teams that need analytics, session replay, and feature flags in one tool, whereas Amplitude targets growth teams needing advanced product analytics.

At a glance

	PostHog	Amplitude
Best for	Product teams that need analytics, session replay, and feature flags in one tool	Growth teams needing advanced product analytics
Starting price	Free	Free
Free tier	✓	✓
Open source	✓	—
Free tier available	✓	✓
Open source	✓	—
A/B Testing	✓	—
Behavioral Analytics	—	✓
CDP	—	✓
Cohorts	—	✓
Experiments	—	✓
Feature Flags	✓	—
Product Analytics	✓	—
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

Amplitude

Strengths

Includes Behavioral Analytics as a core feature, purpose-built for analytics workflows
Includes Cohorts as a core feature, purpose-built for analytics workflows
Free up to 10M events/mo — generous enough for most small teams to get real work done
Established product with 14+ years on the market and a mature ecosystem

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Data accuracy depends on tracking setup — misconfigured events give misleading results
Mobile experience lags behind the desktop version in features and polish

Try Amplitude → Full review

The bottom line

Pricing: Both PostHog and Amplitude are free. You can try both without spending a dollar.

Feature gaps: PostHog offers A/B Testing, Feature Flags and Product Analytics that Amplitude lacks. Amplitude brings Behavioral Analytics, CDP and Cohorts that PostHog does not have.

Team fit: PostHog is geared toward any size teams, while Amplitude 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: PostHog is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Amplitude is proprietary — you are trusting the vendor with your data and uptime.

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). Amplitude's biggest strengths are: includes behavioral analytics as a core feature, purpose-built for analytics workflows. includes cohorts 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 Amplitude, the main complaint is that free plan exists but key features are locked behind the paid upgrade.

Choose PostHog if...

You need a tool built for product teams that need analytics, session replay, and feature flags in one tool
You need self-hosting, data sovereignty, or the ability to audit source code
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 Amplitude if...

You need a tool built for growth teams needing advanced product analytics
You specifically need Behavioral Analytics and CDP
You care about includes cohorts as a core feature, purpose-built for analytics workflows
Your team size fits the mid-size teams profile Amplitude is designed for
The free tier works for you: free up to 10m events/mo