Opsis vs FullStory: from searchable replay to reproduced, fixed bugs
FullStory is one of the original and best session-replay platforms, known for high-fidelity DOM replay and powerful search across everything users did. Opsis is built to act on exactly that data: it finds which sessions are defects, reproduces the failure in a real browser, proves it on video, and writes the fix. They're a natural pair.
At a glance
| Dimension | Opsis | FullStory |
|---|---|---|
| Primary job | Find, prove & fix bugs | Session replay & search |
| Session replay | Reads yours (FullStory, SDK) | Records its own |
| Heatmaps (click / scroll / attention) | Yes (Pro+) | Yes |
| Search across every session | No (focused on findings) | Yes, element & event search |
| Reproduces the bug in a browser | Yes, via Opsis MCP | – |
| Proof video of the failure | Yes | No (replay, not reproduction) |
| Hands you a copy-paste fix | Yes, per finding | – |
| Pre-deploy QA crawl | Yes, before-ship | – |
Opsis
FullStory
What FullStory is great at
High-fidelity session replay & search
FullStory records pixel-accurate DOM replay and lets you search across every session by element, event, error or user attribute. For finding the right session fast, its search is genuinely strong.
Friction & signal detection
FullStory flags rage clicks, dead clicks and errors, and offers journey and funnel views. That detection is exactly the kind of finding Opsis can read and reproduce.
Search finds the session. It doesn't reproduce the bug or fix it.
FullStory's search gets you to the right session in seconds, but you still watch it, judge whether it's a real bug, then try to reproduce it and write the fix yourself. At scale that's more replays than any team can triage. Opsis closes the loop: it reads the strongest signals, reproduces the failure via Opsis MCP, proves it on video, and returns a guard-railed fix.
How they fit together
Point Opsis at the sessions FullStory records (or use the Opsis SDK). Opsis reads the friction and error signals, reproduces the failure in a browser through Opsis MCP, proves it on video, and writes the fix. FullStory keeps recording and searchable; Opsis turns the bad sessions into action.
When to use which
Use FullStory
Reach for FullStory when you want high-fidelity replay and the ability to search across every session by element, event or error.
Use Opsis
Reach for Opsis when you need the broken sessions reproduced on video and fixed, instead of searching, watching and rebuilding the failure yourself.
Together
Best together: FullStory records and makes sessions searchable, Opsis reproduces the failures and writes the fixes.
Questions
Does Opsis replace FullStory?
No. Opsis isn't a replay or search platform. It reads the sessions FullStory records, reproduces the strongest findings in a browser, proves them on video, and writes the fix. Keep FullStory for replay and search.
Does Opsis do session search like FullStory?
No. Opsis is focused on findings: it detects, reproduces and fixes the broken sessions. Powerful cross-session search is intentionally left to replay tools like FullStory.
How is Opsis different from FullStory?
FullStory records and lets you search replays. Opsis takes the strongest findings, reproduces the failure via Opsis MCP, records proof video, and returns a guard-railed fix, so you ship the fix instead of just watching the session.
Do I need FullStory to use Opsis?
No. FullStory is one supported source. You can also connect PostHog, Sentry, drop in the first-party Opsis SDK, or run pre-deploy checks with no session source at all.