All Tools
A complete collection of free AI developer tools. All tools run entirely in your browser for maximum privacy and speed.
Token Calculator
Calculate the estimated token count for your text. Supports multiple languages including English, Chinese, and code.
Token Cost Calculator
Calculate the API cost for different AI models based on input and output token counts. Compare prices across providers.
Tokenizer Viewer
Visualize how your text is split into tokens. See the tokenization process and understand token boundaries.
Prompt Formatter
Format your prompts with proper structure for system, user, and assistant messages. Improve prompt organization.
Prompt Diff
Compare two prompts side by side and highlight the differences. Perfect for tracking prompt iterations.
Model Price Comparison
Compare AI model prices from OpenAI, Anthropic, Google, and more. Find the most cost-effective option.
Context Length Checker
Check if your prompt fits within the context limits of various AI models. Avoid truncation issues.
Frequently Asked Questions
Are these tools free to use?
Yes, all our AI developer tools are completely free to use. No registration or API key required.
Is my data safe?
Absolutely. All processing happens locally in your browser. Your text and prompts never leave your device.
How accurate is the token calculator?
Our token calculator provides estimates based on standard tokenization algorithms. While very accurate, actual token counts may vary slightly depending on the specific model.
Which AI models are supported?
We support all major AI providers including OpenAI (GPT-4, GPT-3.5), Anthropic (Claude), Google (Gemini), Mistral, and Cohere.