Free AI Tools Online

Free AI tools are online utilities for tasks around AI models, such as counting tokens, estimating API costs or checking whether text fits a context window, without a subscription. The token counters on this page run in your browser, so you get the result the moment you paste your text.

No. Every tool on Calcxi is free to use with no account, no email address, no sign-up and no credit card. Open the tool and start using it. There are no daily limits either, so use any tool as often as you need.

The token counters work on the text inside your browser, and Calcxi does not store what you paste. Even so, treat any online tool with care before pasting confidential business data, and read Calcxi's Privacy Policy for the full details.

A token is the unit large language models like ChatGPT and Claude read text in. It is not exactly a word: a short common word is usually one token, while longer or rarer words can split into several. Tokens matter because AI APIs charge per token and every model has a maximum context window measured in tokens, so the count controls both cost and whether your text fits.

OpenAI models, including GPT-4o, GPT-4.1 and GPT-5, through the ChatGPT Token Counter, and Anthropic's Claude Opus, Sonnet and Haiku through the Claude Token Counter. A Gemini token counter is in development, and each tool page lists the exact model versions it covers.

Paste your prompt into the matching token counter. It counts the tokens and applies the provider's published price per million tokens. Input tokens, your prompt, and output tokens, the model's reply, are priced separately, so the tool shows both.

For a single, well defined job, often yes: you do not need a paid platform just to count tokens or estimate a bill. Paid products earn their price on bigger workflows such as team collaboration, automation and monitoring. The idea here is a solid free tool for each small job, so you only pay for what genuinely needs a subscription.

Yes. Every tool is responsive and works on phones, tablets and desktops in any modern browser, with nothing to download or install.

A calculator applies a fixed formula to your numbers. The tools in this category work with the way AI models process text, such as how a prompt is split into tokens and what those tokens cost. Formula based calculators live in categories like Finance and Construction.

Counts and prices follow what OpenAI and Anthropic publish, and the tools are updated when models or prices change. Each tool page shows a Last Updated date and explains how its count is worked out, so you can see how current it is before relying on it.

Anyone working with language models. Developers use them to stay inside context limits and control API spend, writers check prompt length before sending it to ChatGPT or Claude, researchers check whether a long document fits in one request, and students use them to see how models split text.

A Gemini Token Counter, an AI cost comparison calculator for OpenAI, Anthropic and Google side by side, a prompt character counter and a context window visualiser. To ask for a specific AI tool, use the contact page, because user requests decide what gets built next.