PostHog is an all-in-one product analytics platform — event tracking, session replay, feature flags, A/B testing and surveys behind a single API and SDK, open-source with a hosted cloud option. Here's the pricing, the free tier, and how to get started.
| Product | Free tier | Beyond free |
|---|---|---|
| Product analytics free tier | 1M events/mo | ~$0.00005/event on-demand |
| Session replay | 5,000 replays/mo | ~$0.005/replay on-demand |
| Feature flags | 1M requests/mo | ~$0.0001/request on-demand |
| Self-hosted (open source) | $0 usage fees | you run the infrastructure |
PostHog's free tier is unusually broad: 1 million analytics events, 5,000 session replays and 1 million feature flag requests per month — across the whole platform, not a single crippled product. That's enough for most early-stage products to run real product analytics, watch session replays and ship A/B tests without a credit card. Usage-based pricing kicks in per product past those thresholds, and each product (analytics, replay, flags) is billed separately.
1. Sign up at posthog.com (US or EU cloud region) or deploy the open-source version yourself.
2. Create a project — PostHog generates a Project API Key immediately, shown in Project Settings.
3. Add the JavaScript snippet (or a framework SDK: React, Next.js, Python, etc.) to your app with that key.
4. For server-side/REST API access (querying data programmatically), create a Personal API Key under Settings → Personal API Keys.
Minimal JavaScript init:
Mixpanel has a smaller free tier (1M events/mo) but a flat overage rate at any scale. Amplitude gives the largest free tier (2M events/mo) but hides its post-free-tier rate behind a custom quote. Self-hosting PostHog (it's open source) removes usage fees entirely but shifts cost to running and scaling ClickHouse/Postgres yourself — worth it only past meaningful volume. Run your real event volume through the PostHog vs Mixpanel vs Amplitude cost calculator to see which billing shape wins for you. For error tracking rather than product analytics, see Sentry.
Yes — 1M analytics events, 5,000 session replays and 1M feature flag requests per month, free, across the whole platform.
Create a project at posthog.com and copy the Project API Key from Project Settings; use a separate Personal API Key for server-side REST calls.
PostHog's combined free tier (analytics + replay + flags) is more generous overall; Mixpanel's raw event free allowance is larger but covers analytics only. Model your real event volume on each vendor's calculator.
Yes — PostHog is open source and self-hosting removes usage-based fees, but you take on running and scaling the underlying infrastructure yourself.
Not affiliated with PostHog. Prices are reference estimates — always verify on the official pricing page.