Opsis vs PostHog: from sessions you can watch to bugs you can fix
PostHog and Opsis are not rivals. Opsis connects to PostHog. PostHog is where you understand what your users do; Opsis is where the broken sessions become reproduced, proven bugs with a fix attached. If you already run PostHog, Opsis is the layer that turns all that replay data into action.
At a glance
| Dimension | Opsis | PostHog |
|---|---|---|
| Primary job | Find, prove & fix bugs | Product analytics & replay |
| Session replay | Reads yours (PostHog, Sentry, SDK) | Records its own |
| Tells you which sessions are bugs | Yes, signal detection + AI | You watch and decide |
| Reproduces the bug in a browser | Yes, via Opsis MCP | – |
| Hands you a copy-paste fix | Yes, per finding | – |
| Re-verifies a fix | Yes, Fixed is earned | – |
| Funnels / experiments / flags | No (not its job) | Yes |
Opsis
PostHog
What PostHog is great at
Best-in-class product analytics
Funnels, retention, trends, feature flags and experiments. PostHog is a genuinely excellent analytics platform for understanding behaviour at scale.
Rich session replay
PostHog records what happened in a session so you can watch it back. That raw replay is exactly the input Opsis reads.
Replay tells you a session looked bad. It doesn't prove the bug or fix it.
Watching hundreds of replays to find the one that broke isn't a workflow; it's a chore nobody has time for. PostHog shows you the session; it won't tell you which sessions are defects, reproduce the failure in a browser, prove it on video, or write the fix. That triage-to-fix gap is the entire job Opsis does.
How they fit together
Connect PostHog to Opsis with one read-only OAuth click. Opsis imports your sessions, runs deterministic signal detection (rage clicks, console errors, failed requests, checkout abandonment), reproduces the strongest findings via Opsis MCP, and hands you a guard-railed fix. PostHog keeps doing analytics; Opsis does QA.
When to use which
Use PostHog
Reach for PostHog when you need to understand behaviour: funnels, retention, experiments, feature flags. It's the analytics brain of your product.
Use Opsis
Reach for Opsis when you need the broken sessions found, reproduced, proven and fixed, without watching replays yourself or writing tests.
Together
Best together: PostHog records, Opsis turns the bad sessions into proven bugs with fixes. One OAuth click connects them.
Questions
Does Opsis replace PostHog?
No. Opsis reads PostHog's session replay (read-only OAuth) and adds the QA layer on top: detection, Opsis MCP reproduction, and fixes. Keep PostHog for analytics.
Do I need PostHog to use Opsis?
No. PostHog is one supported source. You can also connect Sentry, drop in the first-party Opsis SDK, or use pre-deploy checks with no session source at all.