HandyAI

Categories: Coding & Developer Tools, Productivity, Data Analysis | Pricing: Free | Official Website ↗

HandyAI offers a collection of free, single-purpose, in-browser tools for LLM development, including token counters and cost calculators.

HandyAI provides a suite of free, client-side tools designed for prompt engineers, LLM builders, and indie AI developers. These tools are entirely in-browser, ensuring no data leaves the user's browser unless an AI-powered tool is explicitly invoked. The current offerings include an LLM Token Counter and an AI Cost Calculator. The platform also lists several upcoming tools, some of which are AI-powered, such as a Claude System Prompt Analyzer, Regex Builder from Natural Language, JSON Validator + AI Fixer, and Prompt Template Extractor. These future tools aim to assist with various aspects of LLM development and prompt engineering.

Key Features

LLM Token Counter (Claude, GPT, Gemini)
AI Cost Calculator (Claude, GPT, Gemini)
Client-side processing
No sign-up required

Pros

All tools are free to use
No sign-up or account creation needed
Processes data client-side for privacy (unless AI-powered tool invoked)
Provides live cost estimates for LLM API calls
Specifically designed for LLM developers and prompt engineers

Cons

Limited number of tools currently available
Many announced tools are still in development with distant release dates
No direct API access for programmatic use
Focuses primarily on Anthropic, OpenAI, and Google LLMs
No advanced features beyond single-purpose utilities

Use Cases

Counting tokens for various LLM models
Estimating monthly LLM API costs
Analyzing Claude system prompts (future)
Converting JSON Schema to Anthropic tool definitions (future)
Building regex from natural language descriptions (future)

Best For

Prompt engineers
LLM builders
Indie AI developers
Developers needing quick LLM token counts
Users estimating LLM API costs

Platforms: Web

Watch demo on YouTube ↗

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