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Tools — Free AI Utilities

// tools — 9 tools · 4 categories

Built with AI, not guaranteed to work, not going anywhere. Free, no accounts — everything runs in your browser.

🔑 Some tools need an API key — you bring yours, we never store it. Get a free Gemini key →

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Context Window Planner

Will your files fit in the context window? Drop them in and find out before you burn tokens.

client-side multi-model
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System Instruction Builder

Stop writing system prompts from scratch. Pick a template, fill in the blanks, copy.

client-side 4 templates
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Session Architect

Set the goal before you start talking. Get a structured opening brief to paste into any chat.

client-side exportable brief
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Token & Cost Counter

Find out what your prompt actually costs. Paste text, pick a model, get the bill.

client-side 13 models
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Prompt Sharpener

Paste a prompt. See what's vague, what's missing, and what the AI will guess on its own.

client-side 9 checks
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Prompt Library

Your prompt collection. Stays in your browser, exports when you want it.

client-side export/import
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AI Output Reviewer

Did the AI actually do what you asked? Paste both and find out.

BYOK multi-provider
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Response Translator

Turn "attention mechanism" into "how the model decides what matters." Free glossary scans — AI rewrite for the rest.

free glossary BYOK rewrite
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Asteroid Tracker

What's flying past Earth today. Size, speed, what it's made of, what it's worth.

live data NASA APIs