● Comparisons · Updated
Cosumi Alternative — When to Switch to sharp.go
Looking for a Cosumi alternative? Compare Cosumi’s quick 9×9 browser Go with sharp.go’s immersive 3D Weiqi board, real-time play, and AI opponents — fair, fact-checked.
Answer first: Cosumi is excellent for frictionless 9×9 Go in a browser tab. sharp.go is a Cosumi alternative when you want an immersive 3D Weiqi board, real-time online play, and AI opponents on a modern web client — not a clone of Cosumi’s micro-board niche.
sharp.go is not affiliated with Cosumi. Comparisons below use publicly known product shapes and first-hand testing of what we ship today.
● Competitor comparison
01What Cosumi does well
A quick, low-friction Go experience — and that is a feature, not a bug.
Cosumi earned a loyal following by making it easy to drop a few stones in the browser with no install and little commitment. Load time is short. The experience is great for showing a friend what Go looks like or for a five-minute distraction. We do not think that is the wrong product — it is the right product for that niche.
● Product angle
02Where sharp.go goes further
Built for players who outgrew the casual micro-board and want a 3D-first Weiqi client.
If you have outgrown a casual 9×9 micro-board, Cosumi’s ceiling appears quickly. sharp.go is built for the next step:
- ✓
Immersive 3D board
Rotate, zoom, and inspect stones — the core differentiator vs classic 2D clients.
- ✓
Full Go board sizes
Play beyond a micro-board, including standard 19×19 study and longer games.
- ✓
Real-time online play
Cross-board multiplayer with low-latency move streaming.
- ✓
AI opponents
Engine-backed opponents at multiple strength levels for practice.
- ✓
Ratings powered by Glicko-2
Challenge and bot ladders use a Glicko-2-style rating model in our stack.
- ✓
Browser-only
No native iOS/Android app install required — play at game.weiqi.app.
● At a glance
03Feature comparison
Honest differences — Cosumi still wins on zero-account speed.
● Comparison
Cosumi vs sharp.go
| ● Feature | Cosumi | sharp.go |
|---|---|---|
| Account required | ✗ | Yes (for full online features) |
| Board experience | Quick 9×9 micro-board | Immersive 3D board |
| Board sizes | Focused on 9×9 | 9×9 / 13×13 / 19×19 |
| Real-time multiplayer | ✗ | ✓ |
| AI opponents | Yes (casual strengths) | Yes (engine-backed) |
| Rating system | none / casual | Glicko-2 (challenges & bots) |
| 3D board | ✗ | ✓ |
| Native mobile apps | ✗ | ✗ |
| Public Open API | ✗ | ✗ |
| Tournaments / prize pools | ✗ | ✗ |
| Cost | Free | Free |
| Time to first stone | Very fast (no account) | Fast (browser load) |
● Decision guide
04When to choose which
Choose Cosumi when you want zero friction: open a tab, place a few stones, leave. No account, no long session. Ideal for coffee-break Go or a demo for non-players.
Choose sharp.go when you want a modern 3D Weiqi board, longer games on larger grids, real-time opponents, and AI practice — and you are fine creating an account for history and online features.
Honest trade-offs: Cosumi is faster to first move without signup. sharp.go loads a richer 3D client and expects a server connection for online and AI features. Both are free. The right answer depends on what you want from Go right now. Browser play only — no native App Store / Play Store apps yet.
● Switching
05How to try sharp.go after Cosumi
- 01.
Open game.weiqi.app and create an account (email or supported social login).
- 02.
Play a few games against AI at a comfortable strength to learn the 3D controls.
- 03.
Try a real-time match when you want human opponents.
- 04.
Use smaller boards for Cosumi-like quick sessions; move to 19×19 when you want depth.
● Cosumi vs sharp.go FAQ
01 Is sharp.go free like Cosumi? ▾
Yes. sharp.go (Weiqi 3D) is free to play in the browser at game.weiqi.app. Optional premium features may appear later; core play is free.
02 Can I keep using Cosumi and also try sharp.go? ▾
Absolutely. Many players use Cosumi for a zero-friction coffee-break game and sharp.go when they want a fuller 3D board and longer sessions.
03 Does sharp.go support 9×9 like Cosumi? ▾
Yes. sharp.go is built around the full Go experience including smaller boards for quick games, with a focus on the immersive 3D board.
04 Do I need an account for sharp.go? ▾
Cosumi is famous for play-without-account. sharp.go is account-oriented for match history and online play; the trade-off is persistence and deeper features.
● Next step
Try Weiqi in 3D
Play free in the browser — immersive board, real-time matches, AI opponents. No install.