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Service
App rescue: taking over and fixing an existing mobile app
When an app was built by someone else and is now crashing, rejected by the store, unmaintained or impossible to extend, we audit it, stabilise it and take over its development. We start with facts, not a rewrite: an honest report on the code, dependencies, crashes and store status, then a plan that fixes what is urgent first.
- Applies to
- Flutter apps; other stacks assessed case by case
- Step one
- Code, dependency, crash and store audit with a prioritised report
- Typical fixes
- Crashes, outdated SDKs and target API levels, store rejections, broken builds
- Then
- Features, performance and a maintenance plan
Signs an app needs a rescue
- The previous developer is gone and nobody can build or release the app
- Crash rates or one-star reviews are climbing
- Google Play or the App Store rejected an update, or warned about target API levels or policies
- Every new feature takes longer and breaks something else
- Dependencies are years old and no longer compile with current tools
The audit: what you get before any decision
| Area | What we check | What you receive |
|---|---|---|
| Build | Does it build with current Flutter and SDKs; signing and secrets | Build status and blockers |
| Code | Architecture, state management, test coverage, dead code | Risk map with effort estimates |
| Dependencies | Outdated, abandoned or vulnerable packages | Upgrade plan in safe order |
| Crashes | Crashlytics or store vitals, top crashes and affected versions | Top-10 crash list with fixes |
| Store | Policy status, Data safety, target API deadlines, listing | Compliance checklist |
| Backend | Firebase rules, API health, costs | Security and cost findings |
Stabilise first, then grow
A rescue is sequenced: get a reproducible build, ship a release that fixes the worst crashes and any store deadline, add crash reporting and remote configuration so the next problem is visible and controllable, then upgrade dependencies in small steps. Only after that do features start, on a code base that can carry them. Rewrites are rare and are recommended only when the audit shows it is cheaper than repair.
Ownership and handover
- Source code, store accounts and Firebase projects stay in your name
- Documentation of the build, release and configuration steps
- A maintenance plan so the app does not drift again
Evidence: app rescue and existing app development in our own apps
These are CarrySo's own products, published on Google Play under our developer account. Figures are taken from Google Play when this site was built; each card links to the case study.
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Frequently asked questions
Will you rewrite the app?
Usually not. The audit tells us whether repair or rewrite is cheaper. Most apps are repaired in stages while staying live on the store.
Can you rescue an app that is not built with Flutter?
We specialise in Flutter. For native or other cross-platform apps we assess case by case and may propose a Flutter rebuild if the audit shows repair is not viable.
What do you need from us to start?
Access to the repository, the store developer accounts and the Firebase or backend project, plus any crash reports. The audit starts from there.
Related services
Mobile app development
Mobile app development from idea to app store: Flutter apps for Android and iOS, SaaS mobile apps, MVPs, UI/UX, backend APIs, store deployment and maintenance.
Mobile app maintenance and updates
Mobile app maintenance for Flutter apps: crash monitoring, SDK and target API updates, Google Play policy compliance, update prompts and regular releases.
Flutter app development
Flutter app development for Android and cross-platform apps: architecture, state management, Firebase, on-device processing, testing and store release.
App store deployment
App deployment to Google Play and the App Store: listings, screenshots, privacy policy, Data safety and privacy labels, signing, review, staged rollout and updates.
Have an app idea or an app that needs help?
Tell us what you want to build. We'll reply by email with questions, and then with a proposed scope and estimate.