AI-Powered Go Analysis

Analyze Every Move. Find Every Pattern.

StoneBase is a desktop Go review tool powered by KataGo AI. See win rates and candidate moves for every position, explore variation trees, and search your game library by board position — all running privately on your machine.

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AI analysis with candidate moves, win rate graph, and move tree

Everything You Need to Improve

AI analysis, position search, and a full game library — professional tools for studying Go.

Game Library

Import, store, and organize your SGF game files. Upload single files, multiple files, or entire folders.

Interactive Go Board

Beautiful canvas-based board with stone placement, move markers, and variation preview on hover.

AI Analysis

KataGo evaluates every move with win rates, candidate moves, score estimates, and principal variations.

Move Tree Navigation

Visual move tree with branching variations. Add comments, annotations, and navigate freely.

Game Metadata

Track player names, ranks, events, komi, handicap, results, and dates for every game.

Game Search

Filter by player, date, event, ranks, komi, handicap, move count, board size, result type, and analysis status.

SGF Export

Download your games as standard SGF files, preserving all metadata and analysis.

Board Annotations

Mark positions with circles, squares, triangles, crosses, and text labels for study.

OGS Integration

Import games directly from the Online Go Server. Search by username and bring your full game history into StoneBase.

Board Appearance

Choose from six board themes and three stone styles. Kaya, Cherry, Night mode, Shell & Slate, and more.

English & Spanish

Full interface and game metadata in both languages. Switch anytime from the settings.

Private & Local

Your games and analysis stay on your machine. No cloud accounts, no uploads, no tracking. You own your data.

Go Further with Pro

Unlock advanced tools for serious study and large game collections.

Pro

Batch AI Analysis

Queue multiple games for background KataGo analysis with real-time progress tracking.

Pro

Position Search

Find games containing exact or similar board positions across your entire library.

Pro

Duplicate Detection

Automatically identify duplicate games via move sequence hashing and merge their analysis data.

Pro

Batch Export

Download multiple games at once as a ZIP archive with auto-generated filenames.

Pro

Unlimited Library

No cap on the number of games. Build a comprehensive library of thousands of games.

How It Works

Get from game to insight in three simple steps.

1

Import

Upload your SGF files — individually, in batches, or by folder. StoneBase parses and indexes every game automatically.

2

Analyze

KataGo evaluates every move — win rate, score lead, top candidate moves, and full principal variations.

3

Improve

Review your mistakes, explore better variations, and search for board positions across your entire library.

A Professional Review Environment

Built for serious Go study.

StoneBase — Game Review
AI analysis with candidate moves, win rate graph, and move tree

AI analysis with candidate moves, win rate graph, and move tree

StoneBase — Game Library
Game library with advanced search and batch operations

Game library with advanced search and batch operations

Advanced search with filters for players, dates, rules, and analysis status

Advanced search with filters for players, dates, rules, and analysis status

Duplicate game detection with smart merge and cleanup tools

Duplicate game detection with smart merge and cleanup tools

StoneBase — OGS Import
Import games directly from the Online Go Server by username

Import games directly from the Online Go Server by username

Simple, Transparent Pricing

Start free. Upgrade when you need more power.

Free

Perfect for casual review

€0
  • Up to 50 games in library
  • Single game AI analysis
  • Advanced search & filters
  • SGF import & export
  • Board annotations
  • Move tree navigation
  • OGS game import
  • Board & stone themes
Download Free
Most Popular

Pro

For dedicated players

€9.99 /month

€99/year (billed annually)

  • Unlimited games
  • Batch AI analysis
  • Position search (exact & similar)
  • Duplicate detection & merge
  • Batch ZIP export
  • Use on up to 3 devices
  • Everything in Free
Join the Beta (free)
Coming soon

Max

For players who want the strongest analysis

€19.99 /month

€199/year (billed annually)

  • Cloud KataGo analysis (no local GPU needed)
  • Stronger neural networks
  • Faster analysis speed
  • Priority support
  • Use on up to 3 devices
  • Everything in Pro
Coming soon

Just want unlimited games? — Supporter, €2.99/mo or €24/year

Lift the 50-game cap and help keep StoneBase free for everyone. No other Pro features — just unlimited library and a warm fuzzy feeling.

Coming soon

Frequently Asked Questions

What is StoneBase?
StoneBase is a desktop baduk (Go) game review application — think ChessBase, but for Go. It lets you import SGF files, analyze games with KataGo AI, search for board positions, and organize your game library.
What is KataGo?
KataGo is one of the strongest open-source Go AI engines. It provides move-by-move evaluation including win rate, score estimates, and best variations. StoneBase integrates directly with KataGo running on your machine.
What file formats are supported?
StoneBase supports SGF (Smart Game Format), the standard file format for Go games. You can import single SGF files, multiple files at once, or entire folders.
Is my data stored locally?
Yes. All your games and analysis data are stored in a local H2 database on your machine. Nothing is sent to the cloud — your data stays private.
What board sizes are supported?
StoneBase supports all standard board sizes including 9×9, 13×13, and 19×19.
How much does StoneBase cost?
StoneBase offers a free tier with up to 50 games and single-game AI analysis. For unlimited games, batch analysis, position search, and more, you can upgrade to the Pro plan. The Max plan adds cloud-based KataGo analysis with stronger networks — no local GPU required.
What does the 50-game limit on the Free tier actually mean?
It is the maximum size of your local library at any given time — not a monthly quota and not a lifetime cap. You can import, delete, and re-import games freely; if you hit 50, just delete some you no longer need to make room. There is no per-month import limit, no expiration, and every other Free feature (single-game AI analysis, advanced search & filters, OGS import, SGF import/export, board annotations, themes) has no usage cap.
Is there a cheaper plan if I just want unlimited games?
A Supporter tier is in the works (€2.99/month or €24/year) that lifts only the 50-game cap, with no other Pro features. It is aimed at users who want unlimited library access and want to support the project without paying for Pro features they will not use.
Can I use my license on multiple devices?
Yes. Each license can be activated on up to 3 devices (e.g., your desktop, laptop, and a spare). You can deactivate a device from Settings to free up a slot.
Can I use my own KataGo network?
Absolutely. You can configure the KataGo binary path, network model, and analysis settings through the Settings page.