Catch errors
before your
users do.
Add two lines of code and get real-time error tracking, performance monitoring, and security alerts — with a dashboard your team will actually use.
Free during beta · 50,000 events/month · No credit card required
47+ developers already monitoring their apps
Works with your stack
See it in action
Your errors, caught instantly.
Watch Femmi capture errors as they happen. No configuration, no agents, no infrastructure.
Acme Store
Try the buttons below to generate live Femmi events.
Premium Widget Pro
$49.99
Last action: none
Get started in 30 seconds
Two lines of code.
Install the SDK and call init(). Femmi starts capturing automatically — no config files, no setup wizards.
import { init } from '@femmi/sdk/browser'
init({
apiKey: 'sk-proj-••••••••',
environment: 'production',
})
// Femmi now captures:
// ✓ JavaScript errors & stack traces
// ✓ Network failures & slow requests
// ✓ Memory leaks & Core Web Vitals
// ✓ Security vulnerabilitiesTypeError: Cannot read properties of null
CRITICAL14 occurrences · 8 users affected · 2h ago
at CheckoutButton checkout.tsx:82
at ProductCard product-card.tsx:36
at renderWithHooks react-dom:16308
User journey
● /products/widget-pro
● Add to cart clicked
● Checkout opened → error
View full ticket →
Actionable tickets
From error to fix, faster.
Every error becomes a ticket with full context — stack trace, user journey, affected count, and a suggested fix. Your team knows exactly what broke and how to fix it.
Auto-deduplication:500 users hitting the same bug = 1 ticket.
Session replay:See exactly what the user did before the crash.
Source maps:Minified traces automatically de-obfuscated.
Stay ahead of incidents
Get notified before your users complain.
Set rules that match your risk tolerance. Get paged in Slack, Discord, or any webhook when error rates spike or critical vulnerabilities are detected.
🚨 Femmi Alert — Production
Error rate spiked 4× above baseline
Severity: HIGH · 3 minutes ago
[View Dashboard →]
Rule: "Error spike"
When: error rate > 3× baseline in 5m
Then: POST → hooks.slack.com/…
Throttle: once per hour ✓
Critical ticket threshold
ON> 1 critical → Slack #incidents
Fired 3 times · Last: 2h ago
Error spike
ON3× spike in 5m → Webhook
Fired 1 time · Last: 6h ago
Rules are active and throttled to reduce alert fatigue.
Why Femmi?
Lighter, cheaper, simpler.
Sentry is powerful — but it's heavy and expensive for small teams. Femmi gets you running in 30 seconds.
| Feature | Femmi ✦ | Sentry |
|---|---|---|
| Bundle size | < 5 kb gzipped | ~50 kb gzipped |
| Install | 2 lines of code | 6–10 lines + config |
| Free tier events | 50,000 / month | 5,000 / month |
| Source maps | Included on Pro ($19) | Paid plan required |
| Self-hostable | Yes, open source | Enterprise only |
| Security scanning | Built in | Add-on / third party |
| Overage fees | Events dropped, no surprises | Can escalate quickly |
Based on publicly available plans, 2025. Sentry is a great product — Femmi is just a better fit for indie devs and small teams.
Pricing
Simple, honest pricing.
Start free. Scale when you're ready.
Hobby
$0/mo
For side projects and indie developers.
- ✓1 project
- ✓50,000 events/month
- ✓7-day retention
- ✓Unlimited tickets
- ✓Email alerts
- –Slack / webhook alerts
- –Source map upload
- –Team members
Pro
$19/mo
For production apps and small teams.
- ✓5 projects
- ✓1M events/month
- ✓30-day retention
- ✓Unlimited tickets
- ✓Slack & webhooks
- ✓Source map upload
- ✓5 team members
- ✓Weekly digest emails
Enterprise
Custom
For large teams with custom requirements.
- ✓Unlimited projects
- ✓Unlimited events
- ✓90-day retention
- ✓Unlimited team members
- ✓SSO / SAML
- ✓Dedicated support
- ✓SLA guarantee
- ✓On-premise option
Can I self-host Femmi?+
Yes — Femmi is open source. Run it on your own infrastructure with full control over your data.
What counts as an event?+
Any data point captured by the SDK: a JS error, an API log, a performance metric, or a security alert.
What happens if I exceed my plan limits?+
We'll email you at 80% usage. Events beyond the limit are dropped — we never charge overage fees without warning.
Free during beta
Start monitoring in 2 minutes.
Install the SDK, call init(), and errors start appearing in your dashboard. No config files, no infrastructure to manage.
No credit card required · 50,000 events/month free · Cancel anytime