Utilities
Tools
Small, focused utilities that solve one prompt-engineering annoyance each. Start with the token counter — text never leaves your browser.
Live
Token Counter
Paste a prompt and see token counts across major model families, plus how much of each context window you are using.
Count tokens →Coming soon
Prompt Cost Estimator
Estimate input and output cost for a prompt across providers. Coming next.
Coming soon
Prompt Diff
Semantic diff between two prompt revisions. Highlight adds, removals, and reorders.
Coming soon
JSON Schema Validator
Paste a schema and model output — validate and explain failures.