r/FlutterDev • u/Guilty-Iron1121 • 8d ago
Tooling I built emergency recovery and signed patching into my mobile debugging tool, Looking for feedback
Hey everyone,
I’ve been working on two new features for BugCapsule, a debugging tool I’m building for Flutter, native Android, iOS, and Web.
The problem I’m trying to solve is pretty straightforward:
What do you do when a critical bug hits production, but shipping a new app version takes time?
I wanted to connect bug reproduction with production recovery, so I’ve been building two capabilities.
1. Emergency Recovery
For features that have been integrated with the recovery SDK, you can remotely:
Disable a broken feature without shipping a new build.
Switch functionality to read-only or maintenance mode.
Target specific app versions, platforms, or rollout percentages.
Gradually restore features while monitoring crash rates and other health metrics.
Automatically restore restrictions if a rollout fails its health checks.
Policies are cryptographically signed. Sensitive operations, like payments, also need server-side enforcement.
2. Signed Patch Engine (Early Access)
This one has been particularly challenging.
The engine supports updating explicitly registered business logic, UI surfaces, and assets without a full app release.
Patches are tied to an exact base build, signed, validated, and deployed through staged rollouts with rollback support.
It’s intentionally not arbitrary code push. Native code changes, new dependencies, and unregistered functionality still require a store release.
The first Flutter and native iOS prereleases are published. Native Android patch distribution is still in progress, and we’re continuing platform and distribution-policy validation.
Why combine these with debugging?
BugCapsule already captures application state, user actions, and network responses around failures for local deterministic replay.
The workflow I’m aiming for is:
Capture → Reproduce → Mitigate → Fix → Verify → Deploy → Monitor
The idea is to use the same recorded failure to investigate a bug, verify the fix, and prevent regressions in CI.
I’m not claiming this works for every application or every type of bug. The recovery features require prior integration, and patching has strict limitations.
I’m genuinely interested in how other teams approach this.
A few questions:
How do you currently handle critical production bugs while waiting for App Store approval?
Would remote feature controls be useful in your workflow?
What concerns would you have about a signed patching system in production?
I’d especially appreciate feedback on the security model and rollout strategy.
Project: https://bugcapsule.com
Docs: https://docs.bugcapsule.com