The Firebase Crashlytics alternative for the bugs that don't crash
Crashlytics reports crashes for free. Appxiom also catches ANRs, app hangs, memory leaks and failing APIs on Android, iOS, Flutter and Web, and ranks them by how many users they stop from finishing checkout, signup or any goal you define.
Appxiom or Firebase Crashlytics?
Both are good tools. The right one depends on what you ship and which bugs hurt you most.
Choose Appxiom if…
You ship a web app as well as mobile and want one dashboard for Android, iOS, Flutter and Web. Your worst bugs don't crash: frozen screens, slow or failing APIs, ANRs, iOS app hangs, memory leaks. You need to know which bugs stop users from finishing key journeys. You want your AI coding agent to see each bug's business impact and the user's trail along with the stack trace.
Keep Firebase Crashlytics alongside Appxiom if…
You want free crash reporting with 90 days of history. Your team works in Firebase and Google Analytics and wants crash data in the same console. You also ship Unity or NDK (C/C++) games and want their crash reports to stay in Firebase.
Appxiom vs Firebase Crashlytics
Every Firebase Crashlytics claim links to its official documentation, so you can check it yourself.
| Feature | Appxiom | Firebase Crashlytics |
|---|---|---|
| Android, iOS and Flutter | Yes Native SDKs for Android and iOS, a Flutter plugin and a Kotlin Multiplatform SDK. | Yes Android, Apple and Flutter apps. Source: Crashlytics product page |
| Web apps (JavaScript) | Yes Generally available. JS/TS SDK, React package, client-side setup for Next.js, Nuxt and SvelteKit. | Partial Private preview announced at Google I/O 2026, built on Cloud Logging and Trace. Not generally available yet. Source: Firebase at Google I/O 2026 |
| Crashes | Yes Stack trace, device state and Activity Trail with every crash. | Yes Crash reports grouped into issues and variants by stack trace. Source: Crashlytics docs |
| Non-fatal and handled exceptions | Yes Handled exceptions, custom issues and iOS NSError tracking. | Yes Opt-in. Stores the most recent 8 exceptions per session. Source: Customize crash reports |
| Android ANRs | Yes Detected live while the main thread is blocked, plus ANR exit records on Android 11+. | Yes Android 11 and higher only. Reported when the app next starts. |
| iOS app hangs | Yes Detected automatically in debug and release builds. | Not documented Not described in the docs. iOS SDK 12.18.0 removed its unused MetricKit integration. Source: Apple SDK release notes |
| Memory leaks and spikes | Yes Leaks, memory spikes, abnormal usage and low-memory warnings. In production builds, leaks are detected at screen level (Activity, Fragment and ViewController). In Kotlin Multiplatform, leaks are tracked on the ViewModels and Compose Multiplatform screens you register with Ax.watchLeaks or AxWatchLeakOnDispose. | Partial Groups out-of-memory and low-memory kills on Android 17+, and can collect Android heap dumps. Leak detection is not described. |
| Failed, slow and duplicate API calls | Yes Each one reported as an issue: status code errors, network exceptions, delayed and duplicate calls. | Partial Not in Crashlytics. Firebase Performance Monitoring (a separate, free SDK) shows network requests as aggregated traces. Source: Performance Monitoring |
| Frozen and slow frames | Yes Reported as issues with screen context on Android, iOS, Flutter and Web. | Partial Via Performance Monitoring screen traces on Apple and Android, as a percentage of screen instances. Source: Screen rendering traces |
| Screen load and app startup delays | Yes Screen load delays, plus cold, warm and hot start on Android and cold start on iOS. | Partial App start time via Performance Monitoring. Source: Performance Monitoring |
| Breadcrumbs before a bug | Yes Activity Trail from the Appxiom SDK: lifecycle events, taps and clicks, custom markers, free memory at each step. | Yes Custom logs (64 kB per session) and breadcrumbs powered by Google Analytics, which needs the Analytics SDK. Source: Customize crash reports |
| Release monitoring | Yes Issue Distribution Analytics across every release, plus a Quality Score per version (Professional). | Yes Crash-free metrics, version uptake and comparison with up to 2 earlier builds. Needs 500+ users on a build. Source: Release monitoring |
| Business impact of bugs | Yes Goal Friction Impact scores each user journey from 0 to 10 (Professional). | No Prioritizes by crash-free metrics, users affected and velocity. No journey or goal metric. Source: Crashlytics alerts, Release monitoring |
| MCP server for AI coding agents | Yes Issues, occurrences, Activity Trails, Issue Distribution Analytics, Quality Score and GFI. | Yes Experimental, with no SLA. Issues, events, notes, reports and issue state. Source: AI assistance via MCP |
| Agent Skills | Yes SDK setup skills for every platform, plus MCP skills for goals, severity, quality and telemetry. | Yes Firebase Agent Skills cover Crashlytics setup and debugging in the IDE. Source: Firebase at Google I/O 2026 |
| Data retention | 30–60 days 30 days on Starter, 60 days on Professional. | 90 days Stack traces and identifiers are kept for 90 days. Source: Privacy and security in Firebase |
| Price | Paid Starter $10/month, Professional $99/month, Enterprise custom. 30-day free trial, no credit card. | Free Listed as a no-cost product on every Firebase plan. Source: Firebase pricing |
Android, iOS and Flutter
Native SDKs for Android and iOS, a Flutter plugin and a Kotlin Multiplatform SDK.
Web apps (JavaScript)
Generally available. JS/TS SDK, React package, client-side setup for Next.js, Nuxt and SvelteKit.
Private preview announced at Google I/O 2026, built on Cloud Logging and Trace. Not generally available yet.
Source: Firebase at Google I/O 2026
Crashes
Stack trace, device state and Activity Trail with every crash.
Crash reports grouped into issues and variants by stack trace.
Source: Crashlytics docs
Non-fatal and handled exceptions
Handled exceptions, custom issues and iOS NSError tracking.
Opt-in. Stores the most recent 8 exceptions per session.
Source: Customize crash reports
Android ANRs
Detected live while the main thread is blocked, plus ANR exit records on Android 11+.
Android 11 and higher only. Reported when the app next starts.
iOS app hangs
Detected automatically in debug and release builds.
Not described in the docs. iOS SDK 12.18.0 removed its unused MetricKit integration.
Source: Apple SDK release notes
Memory leaks and spikes
Leaks, memory spikes, abnormal usage and low-memory warnings. In production builds, leaks are detected at screen level (Activity, Fragment and ViewController). In Kotlin Multiplatform, leaks are tracked on the ViewModels and Compose Multiplatform screens you register with Ax.watchLeaks or AxWatchLeakOnDispose.
Groups out-of-memory and low-memory kills on Android 17+, and can collect Android heap dumps. Leak detection is not described.
Failed, slow and duplicate API calls
Each one reported as an issue: status code errors, network exceptions, delayed and duplicate calls.
Not in Crashlytics. Firebase Performance Monitoring (a separate, free SDK) shows network requests as aggregated traces.
Source: Performance Monitoring
Frozen and slow frames
Reported as issues with screen context on Android, iOS, Flutter and Web.
Via Performance Monitoring screen traces on Apple and Android, as a percentage of screen instances.
Source: Screen rendering traces
Screen load and app startup delays
Screen load delays, plus cold, warm and hot start on Android and cold start on iOS.
App start time via Performance Monitoring.
Source: Performance Monitoring
Breadcrumbs before a bug
Activity Trail from the Appxiom SDK: lifecycle events, taps and clicks, custom markers, free memory at each step.
Custom logs (64 kB per session) and breadcrumbs powered by Google Analytics, which needs the Analytics SDK.
Source: Customize crash reports
Release monitoring
Issue Distribution Analytics across every release, plus a Quality Score per version (Professional).
Crash-free metrics, version uptake and comparison with up to 2 earlier builds. Needs 500+ users on a build.
Source: Release monitoring
Business impact of bugs
Goal Friction Impact scores each user journey from 0 to 10 (Professional).
Prioritizes by crash-free metrics, users affected and velocity. No journey or goal metric.
Source: Crashlytics alerts, Release monitoring
MCP server for AI coding agents
Issues, occurrences, Activity Trails, Issue Distribution Analytics, Quality Score and GFI.
Experimental, with no SLA. Issues, events, notes, reports and issue state.
Source: AI assistance via MCP
Agent Skills
SDK setup skills for every platform, plus MCP skills for goals, severity, quality and telemetry.
Firebase Agent Skills cover Crashlytics setup and debugging in the IDE.
Source: Firebase at Google I/O 2026
Data retention
30 days on Starter, 60 days on Professional.
Stack traces and identifiers are kept for 90 days.
Source: Privacy and security in Firebase
Price
Starter $10/month, Professional $99/month, Enterprise custom. 30-day free trial, no credit card.
Listed as a no-cost product on every Firebase plan.
Source: Firebase pricing
Where Appxiom and Firebase Crashlytics differ
Web apps are covered today
Crashlytics has been mobile-only for most of its life. At Google I/O 2026, Firebase announced web support and opened a private preview built on Cloud Logging and Trace. Until it is generally available, a team with a web app still needs a second tool.
Appxiom's Web SDK is available now for JavaScript and TypeScript apps, with a React package and client-side setup for Next.js, Nuxt and SvelteKit. Web issues show up in the same dashboard as your Android, iOS and Flutter apps.
The key difference
Firebase Crashlytics:
Web support is in private preview. Web errors are planned to live in Cloud Logging and Trace.
Appxiom:
HTTP errors, slow and duplicate requests, JavaScript errors, failed resource loads, memory leaks and frame drops on web, next to your mobile issues.
See the bugs that never throw a crash
Crashlytics reports crashes, non-fatal exceptions and Android ANRs (Android 11 and higher, sent on the next app start). Network and rendering data belong to Firebase Performance Monitoring, a separate SDK that shows aggregated traces. Its docs don't describe iOS hang detection.
Appxiom raises each of these as its own issue, with a stack trace, device state and Activity Trail: ANRs detected while the main thread is blocked, ANR exits on Android 11+, iOS app hangs, screen-level memory leaks in release builds (Activity, Fragment and ViewController), Kotlin Multiplatform leaks in ViewModels and Compose Multiplatform screens you register with Ax.watchLeaks or AxWatchLeakOnDispose, failed, slow and duplicate API calls, frozen frames, and screen load and startup delays.
The key difference
Firebase Crashlytics:
A checkout API that times out appears as a latency trace in Performance Monitoring, without the user's steps attached.
Appxiom:
The same timeout is an issue with the device, the stack and the screens and taps that led to it.
Rank bugs by the users they stop
Crashlytics helps you prioritize with crash-free users and sessions, the number of users affected, and velocity alerts when an issue spikes in a release. Those are good stability signals, but they don't tell you whether a bug blocked a purchase or a rarely used settings screen.
Appxiom's Goal Friction Impact (GFI) scores each user journey from 0 to 10. You mark a goal with two calls (beginGoal and completeGoal on mobile, startGoal and endGoal on web), and Appxiom links the bugs users hit to whether they finished. GFI is part of the Professional plan.
The key difference
Firebase Crashlytics:
Issues ranked by events, users affected and velocity.
Appxiom:
Journeys like checkout ranked by GFI score, with the issues users hit before they gave up.
Know what the user did, and how good the release is
Crashlytics adds custom logs (up to 64 kB per session) and breadcrumbs to crash reports. Breadcrumbs are powered by Google Analytics, so you need the Analytics SDK as well.
Appxiom's Activity Trail comes from its own SDK: screen lifecycle events, taps and button clicks, network calls and your own markers, each with free memory at that moment. Quality Score then combines crashes, ANRs, memory and network issues into one score per release, so you can compare versions at a glance (Professional plan).
The key difference
Firebase Crashlytics:
Breadcrumbs need the Google Analytics SDK. Release health is shown as crash-free users and sessions.
Appxiom:
A trail from the Appxiom SDK alone, and one Quality Score per version across every issue type.
Show your coding agent what each bug costs
Crashlytics also has an MCP server, marked Experimental, that lets Claude Code, Cursor or Antigravity read issues, events and reports, plus Agent Skills and free Gemini insights for crashes and ANRs in the console.
Appxiom's MCP server gives your agent the same kind of access across every issue type, and adds what Crashlytics doesn't track: GFI for each user journey, Quality Score, Issue Distribution Analytics and the full Activity Trail. The @appxiom/mcp-skills package teaches the agent how to rank goal drop-offs and judge severity by business impact.
The key difference
Firebase Crashlytics:
The agent sees crash issues, events and stack traces.
Appxiom:
The agent sees which journeys are failing, what the user did before it, and how much it matters.
Use both, or switch when you're ready
You don't have to remove Crashlytics to try Appxiom. Both SDKs can run in the same app, so you can compare them on a real release before you decide.
Add Appxiom next to Crashlytics
Your coding agent can set up the integration using Appxiom Agent Skills. Prefer to do it by hand? Add the SDK and call init with your app and platform keys.
Track one key journey
Wrap a flow that matters, such as checkout or signup, in a goal. That turns on Goal Friction Impact for it.
Compare on a real release
Ship a version with both SDKs and see what each one reports. Then keep both, or remove Crashlytics if you no longer need it.
No data migration is needed. Appxiom reports issues from the first release that includes it, and your past Crashlytics history stays in Firebase.
Firebase Crashlytics alternative FAQs
Straight answers to the questions developers ask when comparing Appxiom and Crashlytics.
Last updated: 3 November 2026. Firebase Crashlytics features change often; every Firebase Crashlytics claim in the comparison table links to its official source.
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