PostHog vs Sentry in 2026: pick PostHog if you want to know how people use your product
PostHog vs Sentry is product analytics that added error tracking against error monitoring that added replay and logs. PostHog's free tier covers 1M analytics events, 5K session replays, 1M feature flag requests and 100K exceptions a month, then usage pricing. Sentry's free Developer plan is for 1 user with 5K errors, 50 replays and 5M spans, and Team costs $29 a month ($26 billed yearly) with unlimited users.
Facts and prices checked on against the sources listed below.
Quick verdict
Pick PostHog if you want to know how people use your product: funnels, replays and feature flags, with error tracking in the same tool and a large free tier.
Sentry
Starts atTeam $29/mo
Pick Sentry if errors and performance come first: stack traces, tracing, release health and alerts across many languages, with unlimited users from $29 a month.
PostHog vs Sentry at a glance
| Feature |  PostHog | Sentry |
|---|---|---|
| Core job | Product analytics, session replay and feature flags | Error monitoring, tracing and performance |
| Free tier | 1M events, 5K replays, 1M flag requests, 100K exceptions a month | Developer: 1 user, 5K errors, 50 replays, 5M spans, 5 GB logs |
| Paid plans | Pay as you go per product, with billing limits | Team $29 a month ($26 yearly), Business $89 ($80 yearly) |
| Error tracking | Yes, each issue linked to the user's session replay | The core product |
| Feature flags | Built in | No own flags; integrates with LaunchDarkly, Statsig, Unleash and others |
| Self-hosting | Free Docker Compose setup under MIT, unsupported | Self-hosted under FSL, Apache 2.0 after 2 years; no Seer AI |
| GitHub stars | 40.6k | 45.7k |
Pricing and free tier (checked Nov 2026)
PostHog prices each product by usage, with a free allowance that renews every month: 1M product analytics events, 5K session replays, 1M feature flag requests and 100K error tracking exceptions. No card is needed to start, and you can set a billing limit per product; PostHog says it will never charge more than that limit. Free plan recordings are kept for 1 month, and for 90 days on pay as you go.
Sentry's Developer plan is free for 1 user, with 5K errors, 50 replays, 5M spans, 5 GB of logs, 1 uptime monitor, 1 cron monitor and a 30 day lookback. Team costs $29 a month, or $26 billed yearly, with unlimited users, 50K errors and up to 90 days of lookback. Business costs $89 a month, or $80 billed yearly. Logs past 5 GB cost $0.50 per GB, and Seer, Sentry's AI, costs extra.
Different starting points
PostHog starts from the product side: who signed up, where they dropped off, what they clicked, and which feature flag they saw. Error tracking was added on top, and every issue comes with the affected user's session replay.
Sentry starts from the code side: an exception with its stack trace, the release that introduced it, the trace across services and the performance cost. Sentry does not have its own feature flags, but it reads flag changes from LaunchDarkly, Statsig, Unleash, Flagsmith and others to link them to new errors.
Self-hosting and licences
PostHog's self-hosted hobby deployment is free under MIT, runs on Docker Compose and needs about 4 vCPU, 16 GB of RAM and 30 GB of storage. PostHog does not support it and suggests its cloud above about 300K events a month. The repository is MIT outside its ee directory and had 40.6k stars on GitHub.
Self-hosted Sentry is Fair Source under the FSL, which turns into Apache 2.0 after 2 years. It needs 4 cores, 16 GB of RAM plus 16 GB of swap and 20 GB of disk, comes with no support and has no Seer AI features. The repository had 45.7k stars.
When to pick PostHog
- You want analytics, replays and flags in one tool.
- You want a large free tier for a whole team.
- Basic error tracking is enough for now.
When to pick Sentry
- Errors and performance are your main worry.
- You run many services in many languages.
- You want unlimited users from $29 a month.
See also PostHog vs Mixpanel, PostHog pricing and PostHog alternatives.
FAQ
Can PostHog replace Sentry?
For many small apps, yes. PostHog has error tracking with 100K exceptions a month on the free tier, and each issue comes with the affected user's session replay. Sentry goes deeper on stack traces, tracing and performance across many languages, so larger backends often keep it.
Is Sentry free?
Sentry's Developer plan is free for 1 user, with 5K errors, 50 replays, 5M spans, 5 GB of logs, 1 uptime monitor and 1 cron monitor, and a 30 day lookback. Team starts at $29 a month, or $26 billed yearly, with unlimited users.
Can I self-host PostHog or Sentry?
Both, with limits. PostHog's hobby Docker Compose deployment is free under MIT, needs about 4 vCPU and 16 GB of RAM, and comes without support; PostHog suggests its cloud above about 300K events a month. Self-hosted Sentry is Fair Source under the FSL, needs 4 cores and 16 GB of RAM plus swap, and has no Seer AI features.
Should I use both?
Plenty of teams do: Sentry for backend errors and performance, PostHog for product analytics and flags. If you want one bill, start with PostHog and add Sentry when you need deeper tracing.
Sources, checked November 1, 2026
Prices and plans change often. If something here is out of date, tell us through the contact page.