mostviable

Live: https://mostviable.100dayaichallenge.com

Product-concept mockup, not a literal screenshot. Try the live app at the link above.

Day 101 of Savion's 100 Day AI Build Challenge — one app per day for 100 days.

If you build far more apps than you sell, mostviable tells you which ones are worth turning into a product. It reads the GitHub repos you choose, researches the real market for the strongest candidates, and names the three most viable, each with a price and a plan to sell it.

What it does

1. Connect and choose. Sign in with Google, connect GitHub, and tick the repos to include. Only ticked repos are read.
2. Triage. Every selected repo is scored from its README, file list and dependencies.
3. Market research. The top eight candidates get live web research: evidence of demand, real competitors and what they charge. Every claim links to its source, and a source that did not appear in the search results is flagged as unverified.
4. The top three. The shortlist is compared side by side and three winners are picked on market demand and how sellable they are, with code readiness as the tiebreaker.

What you get for each winner

• Scorecard: five weighted dimensions (market demand, ease of selling, willingness to pay, open competition, readiness) with the reasoning behind each score.
• Market view: competitors with their published pricing, demand evidence, and a recommended price.
• Go-to-market kit: positioning, a first customer profile, pricing tiers, where to find buyers, a ten-step plan to the first ten customers, and a launch message you can copy.
• Gap-to-sellable checklist: what the repo still needs before someone could pay for it, with progress you can tick off.

You also get the runners-up with the reason each missed the top three, and an honest list of repos not worth pursuing as products.

A rescan only redoes work for repos that are new or were pushed to since the last scan.

Install

git clone https://github.com/Still-InFrame/day-101-mostviable.git
cd day-101-mostviable
npm install
npm run dev

Copy .env.local.example to .env.local and fill in:

• NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY: a Supabase project with Google sign-in enabled. Create the tables with supabase/schema.sql.
• ANTHROPIC_API_KEY: a Claude API key.
• GITHUB_CLIENT_ID and GITHUB_CLIENT_SECRET: from a GitHub OAuth App (GitHub → Settings → Developer settings → OAuth Apps). Add a redirect URI of <your origin>/api/github/callback for each origin you run on. Leave "Expire user access tokens" unticked: the app does not refresh tokens yet.
• GITHUB_TOKEN_ENCRYPTION_KEY: openssl rand -base64 32.

Scans call the Claude API on your key, so each one costs money.

Stack

• Next.js 16 (App Router), TypeScript, Tailwind CSS
• Supabase for Google sign-in and data, with row-level security per user
• GitHub OAuth for repo access; tokens are stored encrypted
• Claude Opus 5.5 with web search for triage, research and ranking
• Deployed on Vercel

Links

• Live app: https://mostviable.100dayaichallenge.com
• Challenge tracker: https://www.100dayaichallenge.com/share/savion