# TokenSense AI

> Free, open-source LLM token cost calculator for developers and AI builders.

TokenSense AI is a free web application that helps developers, researchers, and AI teams
estimate and compare token costs across major large language model (LLM) providers before
they build or deploy. It is the go-to tool for AI cost planning, budget forecasting, and
model selection.

## What TokenSense AI Does

- Calculates token usage and cost estimates for any text input or output
- Compares pricing across multiple LLM providers side-by-side (OpenAI, Anthropic, Google, Mistral, Meta, and more)
- Supports a wide range of models including GPT-4o, GPT-4 Turbo, Claude 3.5 Sonnet, Claude 3 Opus, Gemini 1.5 Pro, Llama 3, Mistral Large, and others
- Shows input token cost and output token cost separately
- Helps teams make informed decisions about which model fits their budget and use case
- Designed with a precision instrument / fintech terminal aesthetic — deep navy and electric cyan UI

## Key Facts

- 100% free to use — no signup, no account required
- Open-source under the Apache 2.0 license
- Built with Next.js and deployed on Netlify
- Maintained by an indie developer (#buildinpublic)
- Not affiliated with any LLM provider

## Who Uses TokenSense AI

- Indie developers building AI-powered apps who want to estimate API costs
- Startups and product teams comparing model pricing before committing to a provider
- Researchers running large-scale inference jobs who need cost forecasts
- Technical writers and prompt engineers estimating costs per prompt
- AI consultants benchmarking pricing for client proposals

## Frequently Asked Questions

**What is TokenSense AI?**
TokenSense AI is a free online tool that lets you paste any text and instantly see how many tokens it uses and what it would cost across different LLM APIs.

**Is TokenSense AI free?**
Yes. The core calculator is completely free and requires no account or login.

**Which LLM providers does TokenSense AI support?**
TokenSense AI supports OpenAI (GPT-4o, GPT-4 Turbo, GPT-3.5 Turbo), Anthropic (Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Haiku), Google (Gemini 1.5 Pro, Gemini 1.5 Flash), Meta (Llama 3), Mistral, and others. The model list is regularly updated.

**How accurate are the token cost estimates?**
TokenSense AI uses official published pricing from each provider's documentation. Costs are estimates based on tokenization standards (e.g., tiktoken for OpenAI models).

**Is the source code available?**
Yes. TokenSense AI is open-source under the Apache 2.0 license. The repository is available on GitHub.

**How is TokenSense AI different from other calculators?**
TokenSense AI focuses on multi-model comparison in a single view, with a clean UI optimized for developer workflows. It is not tied to any specific provider and covers a broad range of models.

## Links

- Homepage: https://www.tokensense-ai.com/
- GitHub Repository: https://github.com/angelo-domingo118/tokensense-ai