FirstThree

FirstThree turns one sentence about your app idea into a tiny v1 build plan you can carry into your favorite vibecoding builder. Key features: • A v1 feature list with what to include • A clear skip list explaining what to leave out and why • The simplest recommended tech stack • The main screens your app needs • Three copy-paste prompts in build order • A done-when check after each prompt FirstThree is built for the moment after you have an idea but before you start building. Most first projects fail because the scope grows too fast, with accounts, notifications, and integrations added before anyone has used the core feature. The tool keeps v1 small by separating what is essential from what can wait, so you finish a working version instead of an unfinished one. Each recommendation includes a short reason, which helps you understand the tradeoffs rather than just following a list. The prompts are written for Cursor, Lovable, Bolt, Replit, or ChatGPT. Each one is scoped to a single step, so you can paste it, check the result against the done-when criteria, and move on to the next. Beginners get plain-language instructions on how to run the app, and experienced builders get a clean starting structure they can extend. Because the output is structured, you can revise your idea and regenerate the plan without starting over. FirstThree is ideal for hobbyists, indie makers, students, and non-technical founders who want to test an app idea quickly. It works well for personal tools like habit trackers, shared-item logs, and meal planners, as well as small public products. The service is free, requires no sign-up, and does not store the ideas you submit.