What Tablif read on BlunderLens's site
BlunderLens describes itself as: “BlunderLens · Your 3 most repeated chess mistakes (Chess.com or Lichess)”
- Price model: Monthly · free tier
- Free tier: Free forever
- Stage: Live, no waitlist
- How it differs: “Game Review looks at one game at a time. BlunderLens looks across your last 12–20 games and counts what repeats”
What it is
Calls itself “BlunderLens”.
- Calls itself: BlunderLens
Where it puts itself
Rules out “store your games or your report”.
- Says it will not: store your games or your report
“Game Review looks at one game at a time. BlunderLens looks across your last 12–20 games and counts what repeats”
“We don't store your games or your report.”
What it costs
Monthly subscription. A free tier, free forever. Prices quoted: $7/month.
- Monthly: yes
- Free plan: free forever
- Price: $7/month
“Daily Training Plan $7/month”
“Free sample report $0”
Who it sells to
Sells to consumers.
- Sells to: consumers
“Find the 3 chess mistakes you keep repeating, free”
How it runs
A web app. Runs locally and works offline. Offers an API. AI is the core of the product. Built with Vercel.
- Kind: web
- Runs where: on the device, offline
- API: yes
- AI role: core to the product
- Built with: Vercel
“Stockfish checks your recent games in your browser and ranks the 3 mistakes you repeat most”
“The engine runs on your own device and measures how much each move changed your winning chances.”
What it works with
Integrates with Stripe. Built on Chess.com, Lichess and Stockfish.
- Integrates with: Stripe
- Built on: Chess.com · Lichess · Stockfish
“BlunderLens”
“Chess.com”
What it offers as proof
Live, no waitlist. Try it without signing up. Publishes docs.
- Instant signup: yes
- Trial asks for: nothing
“Find my 3 mistakes →”
“Sample report: $0 , no signup.”
Sources
Tablif read these pages, last on 20 Oct 2026. Everything above is what the product says about itself; Tablif does not verify every claim.
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