OneHandy Studio
Free AI cost calculator, prompt library and 100+ browser too
OneHandy Studio is a Korean AI-tips publication that also ships 100+ free, client-side web tools — an AI API cost calculator, text and format converters, and design utilities. Everything runs in the browser with no login and no data sent to a server. New tools and articles are added weekly.
Features
100+ browser-only tools: calculators, converters, generators
AI API cost calculator (GPT, Claude, Gemini, GLM pricing)
Prompt library and prompt assembler for ChatGPT workflows
No signup, no server round-trip — all client-side
Weekly AI-tips articles alongside the tools
Use Cases
Estimate AI API costs before committing to a model or plan
Convert file formats, encode or decode data without installing anything
Pull a ready-to-use ChatGPT prompt instead of writing one from scratch
Learn practical AI workflows through the weekly blog posts
Comments
Hi Fazier! I run OneHandy Studio - it started as a Korean blog about actually using ChatGPT/Claude/Gemini day to day, and grew into 100+ small browser tools we built ourselves (AI cost calculator, converters, prompt library) because we kept needing them and couldn't find a version we trusted with our own data. Everything runs client-side, nothing gets uploaded. Would love feedback on which tool category is most useful to you.
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Comments
Hi Fazier! I run OneHandy Studio - it started as a Korean blog about actually using ChatGPT/Claude/Gemini day to day, and grew into 100+ small browser tools we built ourselves (AI cost calculator, converters, prompt library) because we kept needing them and couldn't find a version we trusted with our own data. Everything runs client-side, nothing gets uploaded. Would love feedback on which tool category is most useful to you.
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