Mobile App Bug Fixing by Freelance App Developers

What mobile app bug fixing covers

Mobile app bug fixing is short, focused work on an app that already exists, often one built by someone who is no longer available. Typical jobs include:

• Crashes on launch, after login or on specific phones.
• Screens that freeze or show the app-not-responding dialog.
• API errors: blank lists, failed payments, wrong data from the server.
• Builds that no longer compile after a library or OS update.
• Google Play policy warnings and App Store rejections.
• Poor app performance: slow screens, battery drain, a memory leak.

App bug fixing cost in India

Freelancers price app bug fixing per issue, per batch or by the hour. Typical ranges:

Bug-fix gigs here begin at ₹999. Same-day work, missing source code or very old frameworks push the price up.

Fixed price vs hourly for app bug fixing

A fixed price works when the bug is easy to reproduce and the cause is clear. Hourly suits mystery crashes where finding the cause is most of the job. A fair middle path: pay for two or three hours of investigation, then agree on a fixed price for the fix.

How long does mobile app bug fixing take?

Simple bugs take a few hours. Crashes that need log analysis take one to three days. Upgrades of old projects can take a week or more, plus store review time.

Why does my app keep crashing?

Most crashes come from a short list of causes: a null value the code did not expect, a server response in a new format, a missing permission on newer Android or iOS versions, running out of memory on cheaper phones, or a library that conflicts with an update. Any app bug fixing job starts by working out which one applies.

How to find the cause of an app crash

The developer starts with crash logs, which show the exact line and the device. On Android they read Logcat in Android Studio; on iPhone they use the Xcode debugger and crash reports from App Store Connect. Debugging then means reproducing the crash on the same OS version and fixing the root cause, not hiding the error.

What is Firebase Crashlytics?

Firebase Crashlytics is a free crash-reporting tool from Google that works with Android, iOS, Flutter and React Native. It groups crashes, shows how many users each one affects and records the phone model and OS. If your app does not have it, adding it is usually the first task in any app bug fixing order.

Why does my app work on emulator but not on phone?

Emulators run on powerful computers with clean stock Android. Real Xiaomi, Oppo or Vivo phones have less memory and kill background tasks aggressively. You are also usually testing a debug build on the emulator, while the phone runs a release build where code shrinking can remove classes the app still needs.

How to fix app crash on older Android versions

The app usually calls a feature older versions lack, without a version check. Add the checks, test on the minimum supported version, or raise the minimum if few users are affected.

Fix Android app crashes and errors, including ANRs

What is ANR in Android?

ANR stands for Application Not Responding. Android shows it when the app blocks the main thread for about five seconds, often while waiting for a slow network call. Google Play tracks your ANR and crash rates in Android vitals, and apps above its thresholds can get less visibility in the store.

How to fix app not responding error

Move network calls, database work and image processing off the main thread, add timeouts to API requests, and check the ANR traces in Play Console to find the blocked line.

Why was my app rejected by Google Play?

Common reasons include a Data safety form that does not match the app, SMS or location permissions without a valid reason, an old target API level, or a login that fails for the reviewer. The rejection email names the policy, so the fix is usually quick.

Fix iOS app bugs and crashes

iPhone crashes often come from force-unwrapped values in Swift, threading mistakes, or memory problems on older iPhones. Developers check crash reports in Xcode Organizer and profile memory with Instruments.

How to fix App Store rejection

Read the message in App Store Connect carefully; it cites a guideline number. Frequent ones are crashes during review, a missing demo account, no in-app account deletion, or digital purchases outside Apple's payment system. Fix the issue, explain the change in the reply, and resubmit.

Bugs in Flutter, React Native and inherited code

Cross-platform apps have their own failure points. A Flutter app bug fixing freelancer often deals with package conflicts after a Flutter upgrade, platform channel errors and iOS build failures from CocoaPods. A React Native app bug fixing service usually covers Metro bundler errors, native module mismatches and crashes that appear only in release builds. For bigger Flutter work, see Flutter development.

Can another developer fix bugs in my app code?

Yes, if you have the complete source code and the build works. The new developer will need a day or two to understand the project before fixing anything, so the first bug costs more than later ones.

Should I rebuild or fix my existing app?

Fix it when the code is reasonably organized and the framework is still supported. Consider rebuilding when every fix breaks something else, the framework is abandoned (old Cordova or Ionic versions, very old React Native), or you no longer have the source code.

Access, code sharing and bug reports

What access to give a developer to fix my app

Give only what the job needs: the repository, Crashlytics viewer access and a test login. Add them to Google Play Console or App Store Connect with a limited role rather than sharing your own login.

How to share app source code safely

Invite the freelancer to a private GitHub, GitLab or Bitbucket repository instead of sending a zip. Keep production API keys out of the repo and remove access when the job closes.

How to report bugs to an app developer

1. Steps to reproduce, numbered.
2. What you expected and what happened.
3. Phone model, Android or iOS version and app version.
4. A screen recording and any error text.
5. How urgent it is and how many users are affected.

Paste this into your mobile app bug fixing order or post a requirement. Chat stays on Naukri Mitra, contact numbers are shared once the developer takes the order, and you pay them directly, ideally after the fix is tested.

Testing the fix and keeping crashes down

Good app bug fixing ends with a release plan, not only a code change.

How to test an app after bug fixes

Check the original bug on the same phone and OS where it appeared. Then do regression testing: run through login, payments and other key flows to make sure nothing else broke. Release through the internal testing track or TestFlight first, then a staged rollout to a small share of users.

How to reduce app crashes and improve rating

Watch Crashlytics weekly and fix the top crashes first, use staged rollouts for every release, and reply to one-star reviews once the problem is fixed. Ask for ratings only after a happy moment, such as a delivered order. For new features rather than repairs, browse mobile app development.