Open, decentralised, immersive worlds built on Matrix (by matrix-org)

Thirdroom Alternatives

Similar projects and alternatives to thirdroom

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better thirdroom alternative or higher similarity.

thirdroom reviews and mentions

Posts with mentions or reviews of thirdroom. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-27.
  • WebXR
    4 projects | | 27 May 2023
    you can calculate 2D CSS transforms which match the equivalent transforms of your WebGL scene in WebXR - as an efficient but hacky way to (for instance) do live video overlays in 3D without having to mess around importing the video texture into WebGL (assuming you don’t need occlusion or environmental effects etc).

    we’re toying with this as an approach for video overlays in, especially for underpowered devices.

    2 projects | | 23 May 2023
    by “matrix chat 3d like things” do you mean

    It would be super easy to build something like this on Third Room - and then get e2ee and decentralisation etc for free :)

  • Google Earth 3D Models Now Available as Open Standard (GlTF)
    3 projects | | 10 May 2023
    oh, wow. we have 3D Tile support in but had only ever found NASA’s Mars dataset as a good set of tiles to point it at. This could effectively turn Third Room into a FOSS, decentralised, E2EE multiplayer Google Earth running over Matrix!
  • The AT protocol is the most obtuse crock of s*
    9 projects | | 9 May 2023
    AT proto has some significant similarities to Matrix:

    * Both are work by self-authenticating git-style replication of Merkle trees/DAGs

    * Both define strict data schemas for extensible sets of events (Matrix uses JSON schema - and OpenAPI; AT uses Lexicons)

    * Both use HTTPS for client-server and server-server traffic by default.

    * Both are focused on decentralised composable reputation - e.g. on the Matrix side, or on the bluesky side, etc.

    * Both are designed as big-world communication networks. You don't have the server balkanisation that affects ActivityPub.

    * Both eschew cryptocurrency systems and incentives.

    There are some significant differences too:

    * Matrix aspires to be the secure communication layer for the open web.

    * AT aspires (i think) to be an open decentralised social networking protocol for the internet.

    * AT has portable identity by default. We've been working on this on Matrix (e.g. MSC1228 - and MSC2787 - and have a new MSC (and implementation on Dendrite) in progress right now which combines the best bits of MSC1228 & MSC2787 into something concrete, at last. In fact the proto-MSC is due to emerge today.

    * AT is proposing a asymmetrical federation architecture where user data is stored on Personal Data Servers (PDS), but indexing/fan-out/etc is done by Big Graph Servers (BGS). Matrix is symmetrical and by default federates full-mesh between all servers participating in a conversation, which on one hand is arguably better from a self-sovereignty and resilience perspective - but empirically has created headaches where an underpowered server joins some massive public chatroom and then melts. Matrix has improved this by steady optimisation of both protocol and implementation (i.e. adding lazy loading everywhere - e.g., but formalising an asymmetrical architecture is an interesting different approach :)

    * AT is (today) focused on for public conversations (e.g. prioritising big-world search and indexing etc), whereas Matrix focuses both on private and public communication - whether that's public chatrooms with 100K users over 10K servers, or private encrypted group conversations. For instance, one of Matrix's big novelties is decentralised access control without finality ( in order to enforce access control for private conversations.

    * Matrix also provides end-to-end encryption for private conversations by default, today via Double Ratchet (Olm/Megolm) and in the nearish future MLS ( We're also starting to work on post quantum crypto.

    * Matrix is obviously ~7 years older, and has many more use cases fleshed out - whether that's native VoIP/Video a la Element Call ( or virtual worlds like Third Room ( or shared whiteboarding ( etc.

    * AT's lexicon approach looks to be a more modular to extend the protocol than Matrix's extensible event schemas - in that AT lexicons include both RPC definitions as well as the schemas for the underlying datatypes, whereas in Matrix the OpenAPI evolves separately to the message schemas.

    * AT uses IPLD; Matrix uses Canonical JSON (for now)

    * Matrix is perhaps more sophisticated on auth, in that we're switching to OpenID Connect for all authentication (and so get things like passkeys and MFA for free):

    * Matrix has an open governance model with >50% of spec proposals coming from the wider community these days:

    * AT has done a much better job of getting mainstream uptake so far, perhaps thanks to building a flagship app from day one (before even finishing or opening up the protocol) - whereas Element coming relatively late to the picture has meant that Element development has been constantly slowed by dealing with existing protocol considerations (and even then we've had constant complaints about Element being too influential in driving Matrix development).

    * AT backs up all your personal data on your client (space allowing), to aid portability, whereas Matrix is typically thin-client.

    * Architecturally, Matrix is increasingly experimenting with a hybrid P2P model ( as our long-term solution - which effectively would end up with all your data being synced to your client. I'd assume bluesky is consciously avoiding P2P having been overextended on previous adventures with DAT/hypercore: Whereas we're playing the long game to slowly converge on P2P, even if that means building our own overlay networks etc:

    I'm sure there are a bunch of other differences, but these are the ones which pop to the top of my head, plus I'm far from an expert in AT protocol.

    It's worth noting that in the early days of bluesky, the Matrix team built out Cerulean ( as a demonstration to the bluesky team of how you could build big-world microblogging on top of Matrix, and that Matrix is not just for chat. We demoed it to Jack and Parag, but they opted to fund something entirely new in the form of AT proto. I'm guessing that the factors that went into this were: a) wanting to be able to optimise the architecture purely for social networking (although it's ironic that ATproto has ended up pretty generic too, similar to Matrix), b) wanting to be able to control the strategy and not have to follow Matrix's open governance model, c) wanting to create something new :)

    From the Matrix side; we keep in touch with the bluesky team and wish them the best, and it's super depressing to see folks from ActivityPub and Nostr throwing their toys in this manner. It reminds me of the unpleasant behaviour we see from certain XMPP folks who resent the existence of Matrix (e.g. The reality is that the 'enemy' here, if anyone, are the centralised communication/social platforms - not other decentralisation projects. And even the centralised platforms have the option of seeing the light and becoming decentralised one day if we play our parts well.

    What would be really cool, from my perspective, would be if Matrix ended up being able to help out with the private communication use cases for AT proto - as we obviously have a tonne of prior art now for efficient & audited E2EE private comms and decentralised access control. Moreover, I /think/ the lexicon approach in AT proto could let Matrix itself be expressed as an AT proto lexicon - providing interop with existing Matrix rooms (at least semantically), and supporting existing Matrix clients/SDKs, while using AT proto's ID model and storing data in PDSes etc. Coincidentally, this matches work we've been doing on the Matrix side as part of the MIMI IETF working group to figure out how to layer Matrix on top of other existing protocols: e.g. and - and if I had infinite time right now I'd certainly be trying to map Matrix's CS & SS APIs onto an AT proto lexicon to see what it looks like.

    TL;DR: I think AT proto is cool, and I wish that open projects saw each other as fellow travellers rather than competitors.

  • We're not really game yet.
    11 projects | | 24 Feb 2023
    Have you looked into what thirdroom or ambient have done in the space?
  • Introducing Ambient 0.1: a runtime for building high-performance multiplayer games and 3D applications, powered by Rust, WebAssembly and WebGPU
    8 projects | | 22 Feb 2023
    Have you lot made any friends over at Third Room yet? ;)
  • Matrix 2.0 — Matthew Hodgson talks about Rust in Element client, Rust SDK, IETF MLS, MIMI and more
    7 projects | | 7 Feb 2023
    Third Room, which is basically a virtual reality space built using C that leverages Matrix and runs natively in your browser through WASM. I'd recommend anyone that is interested to checkout the video for more details. It's an interesting presentation.
  • The Matrix Holiday Update 2022: "We are witnessing a classic tragedy of the commons."
    3 projects | | 28 Dec 2022
    It's a decentralised comms protocol; it lets you replicate blobs of end-to-end encrypted JSON over a mesh of servers whose users are participating in a given conversation. You can use it for chat or VoIP or weirder stuff like The thing that makes it special is that conversations are fully decentralised over the servers which participate in them, a bit like Git repositories are fully decentralised. There is no single point of control or failure when users are on separate servers, and access control is provided by decentralised ACLs.
  • Hear me out
    11 projects | | 10 Dec 2022
    Perhaps a federated metaverse
  • Thirdroom: Decentralized, open source, 3D collaborative environment
    2 projects | | 3 Oct 2022
    You can play with it at or hop straight into a world like The code is all Apache Licensed up at We're hoping this provides a much-needed counterbalance to the Big Tech visions of the metaverse, or ones which are entangled with decentralised financial incentives, and might be a genuinely open platform for building spatial web/metaverse apps in future.
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Basic thirdroom repo stats
5 days ago

matrix-org/thirdroom is an open source project licensed under Apache License 2.0 which is an OSI approved license.

The primary programming language of thirdroom is C.

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