Chess trainer that turns each player's own games into drills that fix mistakes
Maestro (maestrochess.com) is a finished, live chess-improvement web app. It finds the mistakes a player keeps repeating in their own games and turns them into drills that come back until they stop happening. What it does • Free Blunder Scan: enter a Chess.com or Lichess username and the last 12 games are analysed by Stockfish 18 in the visitor's own browser in about a minute, with no sign-up • Move-by-move Game Review with accuracy, nine move grades and written commentary • Blunder Bank: the player's own mistakes as puzzles, on a spaced-repetition schedule • Chess DNA: a style profile on six axes and an estimated rating • Play the engine at strengths from about 700 to 3500 Elo, or play people online on server-kept clocks • Opening academy, endgame drills, annotated master games, daily puzzle and Puzzle Rush • Installable phone app that opens offline Business • Subscription billing live through Paddle as merchant of record: Pro at $10/month or $100/year • All engine analysis runs in the user's browser, so extra users cost almost nothing; the whole product runs for about $45 a month • Admin dashboard: MRR, churn, sign-ups, countries, acquisition and a scan-to-paid funnel • Honest status: launched July 2026 with no marketing yet; 7 people besides me have signed up, and there are no paying subscribers yet Tech React 18 + TypeScript (Vite), Node.js + Express, SQLite, WebSockets, Stockfish 18 (WebAssembly), Docker + Caddy on one VPS behind Cloudflare, and 467 automated tests running in CI. What's included The domain, the full source code with its git history and all IP, the live deployment, the Paddle setup (moved to your own account), the Search Console and Bing properties, brand assets, a technical overview, runbooks, and 30 days of handover support. Why I'm selling I built the product I set out to build. Growing it is a distribution job, best done by someone with an audience: a chess creator, a coach or a chess-education business.
Next step: <p>Put the free game scan in front of an existing chess audience: a creator's video, a coach's students, a club newsletter. It shows the product in a minute with no sign-up, and every scan is tracked by source through to sign-up and payment.</p><p> Grow search traffic with more guides like the nine already live, which answer questions club players type ("why do I keep hanging pieces?").</p><p>Add a coach plan, so a coach sees each student's repeated mistakes, or partner with chess clubs.</p><p> Put the app in the stores: an Android wrapper and an iOS shell around the existing installable app.</p><p>Offer deeper analysis with the multi-threaded Stockfish build as a Pro upgrade.</p>
For sale
Asking price: $16,500 USD
What's included
Domain name, Source code, All related data, All related design work
The live deployment (server transferred, or redeployed onto yours in minutes), the Paddle billing integration ready for your own account, the Google Search Console and Bing Webmaster properties, email sending (Resend) and uptime monitoring, a technical overview, an incident runbook and a step-by-step handover guide, the 467-test suite running in CI, and 30 days of handover support.
Reason for selling
I built the product I set out to build. Growing it from here is a distribution job, best done by someone who already has an audience, and that isn't me. Maestro deserves an owner who can put it in front of players.
Project metrics
Average Monthly Visitors: Under 1K/mo
Average Monthly Revenue: Pre-revenue
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