GGRS
GGRS: A focused Rust/WebAssembly library for peer-to-peer rollback sessions, not matchmaking. Ranked #25 of 29 in Game Networking Middleware by our editors (6.5/10); pricing: Open source; best for rust browser games needing peer-to-peer rollback.
At a glance
- Editor score6.5 / 10
- PricingOpen source
- Best forRust browser games needing peer-to-peer rollback
- Paid fromFree
- MatchmakingNo
- Facts checked21 Sep 2026
Where it wins
- Rollback, re-simulation, and remote-input prediction
- Spectator sessions, sync tests, and checksum desync detection
- UDP socket plus custom transport integration for browser projects
Where it doesn't
- No matchmaking signalling
- No NAT traversal
- Requires external infrastructure for connection setup
Our verdict on GGRS
GGRS is an open-source Rust library for adding peer-to-peer rollback networking to multiplayer games. It is aimed at developers building Rust or WebAssembly/browser games that need synchronized sessions, remote-input prediction, and rollback after misprediction. The library supports peer-to-peer multiplayer, spectator sessions, and local determinism sync tests, making it a focused option for games whose networking model depends on rollback rather than a hosted backend.
Its standout feature is the rollback workflow. GGRS predicts remote inputs, then rolls back and re-simulates game state when those predictions are wrong. Time synchronization supports coordinated sessions, while checksum-based desync detection helps identify divergent game state. The published feature set also includes a non-blocking UDP socket and a custom transport trait. Browser and WebAssembly projects can adapt WebRTC sockets such as Matchbox, and integrations include Matchbox, Bevy GGRS, and the Godot GGRS Wrapper.
GGRS is open source rather than a hosted networking service, so teams must assemble the surrounding connection infrastructure. It does not provide matchmaking signalling or NAT traversal; those functions require external infrastructure such as Matchbox. That makes it a good fit for developers who want control over a Rust rollback layer and can supply the rest of the networking stack. Teams seeking an all-in-one service for player discovery, signalling, or connectivity management should choose a broader alternative instead.
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GGRS pricing
GGRS fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Network model | P2p |
| Supported platforms | Rust; WebAssembly/browser |
| Matchmaking | No |
| Rollback netcode | Yes |
| Max players per session | Not verified |
| Transport protocols | UDP; custom transports |
| Deployment | Cloud |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Integrations | 3 integrations: Matchbox, Bevy GGRS, Godot GGRS Wrapper |
| Pricing | Open source |
| Website | github.com |
| Facts checked | 21 Sep 2026 |
GGRS integrations
GGRS lists 3 integrations on its own site.
- Matchbox
- Bevy GGRS
- Godot GGRS Wrapper
Alternatives to GGRS
- ColyseusFlexible multiplayer middleware spanning networking, matchmaking, accounts, persistence, and live operations.9.4
- SmartFoxServerA broad, mature backend for studios building real-time multiplayer games.9.2
- Photon QuantumA focused Unity framework for deterministic simulation, rollback, and authoritative validation.9.0
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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