Tools
Free performance tools & calculators
Instant, client-side utilities for load testing, SRE and AI workloads — plus a live site-speed analyser that fetches any URL and recommends fixes.
Analyser
Site Speed Check
Analyse any URL for TTFB, payload, compression and caching — with fixes.
Analyse a site →Calculators
Performance Testing
Pacing Calculator
Find the pacing / think time to hit a target throughput with N virtual users.
Open → AI PerformanceLLM Cost & Latency Estimator
Estimate per-request and monthly token cost plus end-to-end latency for an LLM workload.
Open → ConceptsLittle's Law Calculator
Solve for concurrency, throughput, or latency given the other two (L = λW).
Open → SREError Budget Calculator
Turn an SLO target into allowed downtime and a burn-rate readout.
Open → ConceptsApdex Calculator
Compute an Apdex score from satisfied / tolerating / frustrated counts.
Open → ConceptsLatency Percentile Analyser
Paste latency samples to get p50/p90/p95/p99, mean, and tail spread.
Open →On the roadmap
- Throughput / TPS calculator
- Think time & iteration calculator
- Load generator sizing
- GPU batch-size & throughput estimator
- Universal Scalability Law fitter
- GC time-ratio calculator