Free tools for AI APIs
Free tools for building on AI APIs: an LLM cost calculator, a token counter, a cURL converter, an OpenAI migration guide, a model picker, and an llms.txt generator. No sign-up.
Free tools for building on AI APIs. They run in the browser, need no account, and use the same prices as the model catalogue.
The tools
- LLM API cost calculator — Price a request in seconds and see what it saves against the provider's list price.
- How many tokens does this prompt use? — Count prompt tokens and see how many of them fit into a model's context window.
- cURL to Python, Node.js or Go — Turn a cURL request into the SDK call that runs it.
- Move from the OpenAI API to Aether API — Change the base URL, keep the code, and pay less for the same models.
- Which AI model should I use? — Answer two questions and get the models that fit the job.
- llms.txt generator — Write the llms.txt file for a site so AI crawlers find the right pages first.
What they have in common
- No sign-up — Every tool runs in the browser. No account, no key, no email.
- Live prices — The calculators use the current model catalogue, not a copied price list.
- Built for one key — The generated code points at a single base URL for every model.
After the tool
Every tool points at the same catalogue: every model with its price, context window, and a request example and the credit packages. The calculators price the same models you can call with one key.
Aether API — OpenAI-compatible access to 13+ providers through one API key.