Algorithm:
Token Bucket: allows bursts up to max capacity. Tokens refill continuously.
How to use
What it simulates
This tool simulates a rate limiter and lets you compare two classic algorithms: Token Bucket and Fixed Window. You'll see how many requests are accepted or rejected over time.
Set up the simulation
Choose the algorithm with the toggle above, adjust its parameters and define the incoming traffic: Incoming requests (req/s) and Duration (seconds). Press Simulate to run.
Token Bucket
Allows bursts up to the maximum token Capacity; each request consumes a token and tokens are continuously replenished at the Refill rate (tok/s). Good for absorbing occasional spikes.
Fixed Window
Allows up to Limit requests per fixed time window. It's simple but can suffer the "window edge": a burst straddling two windows doubles the allowed traffic. The summary shows accepted, rejected and the acceptance rate, with a second-by-second timeline (✓ accepted, ✗ rejected).
