← All Tools
Rate Limit Calculator
Model token bucket, sliding window, and fixed window rate limiters with live visualization
⚙️ Algorithm
📊 Results
Response Headers
🎮 Simulator
Ready
Click "Send Request" to simulate API calls…
💡 Quick Reference
- Token Bucket: Best for allowing bursts while enforcing average rate. Used by AWS, Stripe.
- Fixed Window: Simplest to implement. Risk of 2× burst at window boundaries.
- Sliding Window Log: Most accurate. Tracks every request timestamp. Higher memory usage.
- Standard headers:
X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset
- IETF draft:
RateLimit-Limit, RateLimit-Remaining, RateLimit-Reset