Free calculators for LLM APIs and developer workflows. No signup — everything runs in your browser.
Compare Claude, GPT & Gemini token costs by request volume.
Estimate tokens for any prompt or text.
Check if your prompt fits a model's window.
Estimate cost of embedding a dataset.
Opus / Sonnet / Haiku cost estimator.
OpenAI token pricing estimator.
Google Gemini cost estimator.
RPM vs TPM throughput bottleneck.
Which vendor changed rates, and when.
Build and understand cron schedules.
Translate a cron expression to plain English.
Convert Unix timestamps to dates.
Reading & speaking time from word count.