Browser-native · Instant startup · Local-first
Study like a Grandmaster. From any browser.
A serious preparation suite: database-backed analysis, FSRS training, and a ChessBase-class workbench — no install required.
Open FlexiChess — No account needed
Database search
Search 10,313,932 Grandmaster games
Full-database position search over our public index. Measured warm API latency ~90 ms median on production infrastructure (May 2026; see performance baseline). First query after a cold deploy may take longer while edge cache warms.
- Measured warm API latency ~90 ms median on production infrastructure
- Zobrist-indexed position lookup across the full public database
- First query after a cold deploy may take longer while edge cache warms
~90ms
Measured warm median position lookup (May 2026 production bench)
See the game search pane and opening statistics in the hero capture above — same position, full database.
Commentary that reads like a chess book
Tier 1 quick review on critical moments and Tier 2 deep annotation — narrative grounded in engine facts and database precedent, not generic engine blurbs.
Train your openings. Scientifically.
FSRS spaced repetition on your own repertoire — the same memory science as Anki, built into FlexiChess. Free for every user.
Workbench
A real preparation environment. Not a toy.
Floating workbench panels, layout presets (Opening, Live, Analysis), and database plus engine side by side — designed for players who actually study.
- Classic stacked cockpit or freeform floating windows on large screens
- Layout presets: Opening prep, Live viewing, Analysis, and custom workbenches
- Resize and rearrange panels without leaving the browser
Your games. Your machine. Your data.
Collections under 20,000 games stay in your browser until you choose to sync or upload. Sign in only when you want cross-device persistence or cloud-scale libraries.
Browser
Your games (IndexedDB) — default home for local libraries
Optional sync
Sign in to back up settings, repertoire, and training cards
Cloud database
Public GM index — read-only until you explicitly upload
Simple, honest pricing
Pro: $9/mo · $84/yr (save 22%) · Cancel anytime
Free
$0
Full workstation on this device. No account required.
- Engine analysis & notation
- 10M+ game database search
- Opening book explorer
- PGN import up to 20,000 games (local)
- FSRS repertoire training
Synced
Free
Sign in to sync repertoire, training, and settings across devices.
- Everything in Free
- Cross-device sync
- Large PGN collections to cloud
- Server-backed repertoire & FSRS
Pro
$9/mo
GM-quality AI commentary, collaboration, and expanded cloud storage.
- Everything in Synced
- AI GM Commentary (quick + deep)
- Commentary voice selection
- Live collaboration sessions (beta)
- Extended gauntlet history
- Larger personal cloud database