Codefly - Sell Project
Listed October 31, 2026
About Codefly
Duolingo-style web app for learning real JavaScript, with in-browser exercises.
Codefly is a Duolingo-style, browser-based app for learning real JavaScript. It has short lessons, hands-on exercises (including sandboxed code that learners actually run), XP, streaks, levels and badges, spaced-repetition review, certificates, and weekly / friends / all-time leaderboards. Progress is stored in the browser first, optional Supabase cloud sync adds sign-in and cross-device progress. Curriculum covers JavaScript fundamentals through array methods, recursion and OOP. Tech stack: React 19, TypeScript, Vite 8, Tailwind v4, React Router, Framer Motion, CodeMirror 6, Supabase (Auth + Postgres), Vitest and Playwright tests. Status: pre-revenue, roughly 1-2 free users and no traffic - this is a sale of a finished codebase to build on. Included: full source code, the Supabase project and schema, and the brand / logo. Not included: a domain name (the buyer needs to use their own). Reason for selling: I want to focus on other projects.
Project details
Website: https://codefly.webxdevelop.com/
For sale
Asking price: $500 USD
What's included
Source code, All related data, All related design work
Includes the Supabase project (schema, auth config) and the Codefly brand and logo. The domain is NOT included - the buyer needs to use their own domain.
Reason for selling
I am busy with other things and no longer have time to maintain this project.
Project metrics
Average Monthly Visitors: Pre-launch
Average Monthly Revenue: Pre-revenue