Skip the setup.
Start tracking now.
Sentry is the gold standard for error tracking. But you need analytics too. Happenstance gives you both—errors with breadcrumbs AND user behavior—in one zero-config script.
Happenstance
Zero-config
- 1 Add one script tag to your site
- 2 Done. Errors, breadcrumbs, and events tracked automatically.
Sentry
Traditional setup
- 1 Create Sentry account and project
- 2 Install Sentry SDK for your framework
- 3 Configure DSN and environment
- 4 Set up source maps for readable stack traces
- 5 Configure error boundaries
- 6 Set up alerts and integrations
- 7 Then add a separate analytics tool...
Sentry is the industry standard for error tracking. Stack traces, breadcrumbs, session replay, source map support—it's indispensable for engineering teams debugging complex issues. But it's an error tool, not an analytics tool. You still need Mixpanel or Amplitude to understand user behavior. Happenstance catches errors with full context AND tracks user events in one zero-config script.
Feature Comparison
| Feature | Happenstance | Sentry |
|---|---|---|
| Zero-config setup | ||
| Error tracking | ||
| Unhandled promise rejections | ||
| Network/HTTP error tracking | ||
| Breadcrumbs | ||
| Error fingerprinting/grouping | ||
| Stack traces | ||
| Source map deobfuscation | ||
| Event tracking | ||
| User analytics | Limited | |
| Performance monitoring | ||
| Session replay | ||
| Goal tracking | ||
| All-in-one solution | ||
| Free tier | 10k events/mo | 5k errors/mo |
Why teams switch
Teams try Happenstance when they realize they're paying for two tools that don't talk to each other. Sentry tells you WHAT broke. Analytics tells you WHO was affected. Happenstance connects both—see which user journeys lead to errors, and which errors impact your conversion goals. Our error tracking includes breadcrumbs, fingerprinting for grouping similar errors, and full context (browser, URL, screen size).
How to migrate from Sentry
- 1 Add the Happenstance script tag — errors are captured automatically.
- 2 Compare error reports between Sentry and Happenstance for a week.
- 3 If you don't need source maps or deep debugging, remove Sentry's SDK.
- 4 Enjoy combined error tracking and analytics in a single, zero-config tool.
- 5 Use Happenstance's breadcrumbs to see what users did before errors occurred.
Who should use what
Choose Happenstance if...
You want error tracking AND analytics in one tool. Perfect for frontend teams who need to understand both what broke and how users behave.
Choose Sentry if...
You need source-mapped stack traces, performance monitoring, or deep backend error tracking across multiple services.
Integration Code
Happenstance (complete setup)
<script src="https://happenstance.click/v1/track.js"></script>Sentry (just initialization)
import * as Sentry from '@sentry/browser';
Sentry.init({
dsn: 'YOUR_DSN',
tracesSampleRate: 1.0,
});
// Still need separate analytics:
// mixpanel.track(...)
// amplitude.track(...)Sentry is the right choice for teams who need source-mapped stack traces and deep debugging. Happenstance is for teams who want solid error tracking plus analytics in one tool, without the setup complexity.
Start tracking in 30 seconds
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