Free, no-login utilities

Small AI tools for everyday decisions

Use one focused tool, get an answer, and move on. These utilities help with prompt size, token cost, context limits, and JSON overhead.

Prompt Diff

See how an edit changes token count and estimated input cost.

Check whether input and planned output fit a model limit.

Turn input, output, and request volume into an API estimate.

Compare formatted and compact JSON before sending it.

See how many requests fit a monthly token budget.

Check prompt size and remaining context before a request.

FAQ

Are these tools free?

Yes. They run in the browser and do not require an account or API key.

Which tool should I use first?

Use Prompt Diff to compare an edit, Context Window Checker to test capacity, or Tokens to Cost to turn a measured request into a budget estimate.