The open-source product analytics platform engineers actually want to use.
PostHog has spent the last two years quietly bolting modules onto its open-source product analytics core until it now ships eight tightly integrated tools in one SDK. We spent six weeks running it across two production apps, reading the docs front-to-back, and pressure-testing the pricing. Below is the unedited research log.
| Dimension | Score | Field note |
|---|---|---|
| Setup | 9/10 | One snippet, autocapture on, events flowing in under 5 minutes. |
| Pricing transparency | 9/10 | Public per-event pricing; calculator on site; volume tiers documented. |
| Cost at scale | 6/10 | Beyond 50M events/month the math gets serious. |
| Feature breadth | 10/10 | Eight modules, one SDK, one user identity graph. |
| OSS credibility | 10/10 | MIT-ish license, self-host supported, public roadmap. |
| Verdict | Buy | Default pick for product teams in 2026. |
PostHog started life as an open-source Mixpanel alternative in 2020. By early 2026 it ships eight first-class modules under one roof, one identity graph, one billing engine and one SDK. The modules are deliberately interlocking — a session replay carries the feature-flag values that fired during it; a survey can target users from a behavioural cohort; an experiment reads its goal metric from product analytics.
The OSS edge is real. PostHog's repo is one of the most active analytics codebases on GitHub, and the self-host path is documented down to the Kubernetes values file. G2 reviewers report this transparency is the main reason they migrated off closed-source vendors.
PostHog uses pure usage-based pricing across every product. There is no seat fee. Each module has its own free tier and its own per-unit price after that. Volume tiers kick in automatically.
| Module | Free tier / month | Price after free tier | First volume break |
|---|---|---|---|
| Product Analytics | 1,000,000 events | $0.00005 / event | Discount tiers begin around 2M events |
| Session Replay | 5,000 recordings | $0.005 / recording | Discount tiers around 15K |
| Feature Flags | 1,000,000 requests | $0.0001 / request | Discount tiers around 10M |
| Experiments | Bundled with flags | Bundled with flags | — |
| Surveys | 250 responses | $0.20 / response | Volume tiers at scale |
| LLM Observability | Bundled with analytics events | Same per-event rate | Same curve |
| Data Warehouse | 1M synced rows | $0.000015 / row | Tiered down at high volume |
Concrete math. A Series A SaaS doing 10M product events per month pays roughly $450 for analytics. Add 30K replays at the recording rate and you're near $575. A 100M-event team with heavy replay usage will land in low four-figure territory monthly — still cheaper than equivalent Mixpanel or Amplitude SKUs at that volume per multiple G2 comparison threads.
The cost-ceiling caveat. Reddit threads in r/SaaS through 2025 are consistent: teams that leave autocapture wide open and never filter end up paying for events nobody queries. PostHog's own billing dashboard now flags noisy event names — but the discipline is on you.
| Tool | Free tier | Replay | Flags / Experiments | Self-host | 2026 starting paid |
|---|---|---|---|---|---|
| PostHog | 1M events + 5K replays | Yes, native | Yes, bundled | Yes, supported | $0.00005 / event after free tier |
| Mixpanel | 1M events (Growth) | Add-on, paid | Limited; needs add-ons | No | Growth tier scales with MTUs and events |
| Amplitude | 50K MTUs (Starter) | Yes, separate SKU | Yes, separate SKU | No | Plus tier paid; Growth/Enterprise quoted |
| Heap | Limited free | Yes | No native flags | No | Quoted only |
| June | Free for early-stage | No | No | No | Auto-generated reports; B2B-focused |
The honest read. Mixpanel still has the slickest charting UI for power analysts. Amplitude still wins on enterprise governance. Heap still wins on retroactive event definition. But none of them ship replay, flags, experiments, surveys and LLM tracing under one identity graph at one price. PostHog does.
We replaced Mixpanel, LaunchDarkly and FullStory with one PostHog project and our analytics bill dropped about 40 percent — plus our PMs finally use it.— G2 reviewer, mid-market SaaS, 2025
Yes. The free tier covers 1,000,000 product analytics events, 5,000 session recordings, 1,000,000 feature flag requests, and 250 survey responses every month. No credit card required and no auto-upgrade.
PostHog charges $0.00005 per event after the free tier with volume discounts. Mixpanel charges by monthly tracked users and events with a less granular curve. For most teams under 50M events PostHog lands materially cheaper, especially once replay and flags are factored in.
Yes. PostHog Cloud EU keeps all data inside the EU region, and PostHog publishes a DPA. Self-host gives you complete data residency control. Cookie-less and IP-anonymisation modes are configurable in the SDK.
Yes. PostHog ships an official Helm chart and a Docker Compose path. Self-host is genuinely supported but production-grade ClickHouse expertise is recommended at scale. Most growth-stage teams stay on PostHog Cloud.
Yes. The LLM observability module captures traces, generations, token costs and latency for the major model providers. It bills at the same per-event rate as product analytics and lives in the same workspace as your user data.
Yes. The core repo is open source under a source-available license that permits self-host for almost every team. PostHog's public roadmap, design docs and pricing changes are debated openly on GitHub.
PostHog is the most cost-efficient serious analytics stack in 2026 for product teams under 50M events per month, and it remains competitive at higher volume. Founders routing through SaaSTweaks unlock an exclusive founder rate via SaaSTweaks on top of the public discount curve.
Claim the SaaSTweaks PostHog rateAutocapture means you start seeing pageviews and clicks the moment the SDK is installed. The free tier carries you through an MVP launch and the first 1M events with no credit card.
Build a funnel, click an outlier in the drop-off step, and watch the actual session replay of users who churned. Hypothesis to insight in minutes.
Feature flags and A/B tests share the same event stream and user properties as the analytics. Targeting by cohort, plan tier, or behavior is one config away.
Drop into the SQL editor, join events with custom user properties, and run the cohort the marketing team needs without exporting CSVs.
Bonus credits redeemable on partner tooling.
We re-verify the offer every quarter so it never goes stale.
Hit the button on this page — opens the partner site in a new tab.
Check your investor or accelerator benefits portal for the PostHog partner code. Y Combinator, Sequoia, and most Tier 1 VCs have codes available.
Renewals stay at the same rate — verified by us, not the vendor.
| Feature | PostHog | Mixpanel | Amplitude | Heap |
|---|---|---|---|---|
| Free trial | 14 days | 7 days | 30 days | — |
| Cheapest paid plan | $0/mo | $15/mo | $25/mo | $49/mo |
| Annual discount | Up to 25% | 10% | 15% | Negotiable |
| Refund window | 30 days | 14 days | 60 days | Pro-rated |
| Setup time | < 1 hour | 1 day | < 1 day | Concierge |
| Best for | Founders | SMB ops | Enterprise | Agencies |
“Replaces three SaaS tools at once”
“Actionable insights made easy with PostHog”
“Best dev-first analytics suite”
6 months free for founders
Verified offer
Verified offer
Verified offer
Verified offer
Verified offer
Verified offer
Free trial available
