Open MMORPG
Jake Song (solo) · Self-published (open source)
Jake Song's solo, open-source MMORPG experiment where AI agents and human players are treated as equals: agents connect through the exact same WebSocket protocol as humans with no privileged API, so the server cannot tell them apart. The pre-alpha browser build — currently more tech demo than game — offers a procedurally generated 32×32 km world with seasons, twin moons, D&D-style stat-based combat, and multi-story timber-frame housing.
Worth playing in 2026?
No verdict — not out yetOpen MMORPG isn't released (TBA), and hype is not a verdict. When it launches, the score and monetization data will speak for themselves — track it on the release calendar until then.
Worth it if
- ✓ AI-agent tinkerers
- ✓ Open-source contributors
- ✓ Watching an MMO built in the open
Skip it if
- ✗ you need something to play tonight
Composed from this page's data — score, update cadence, monetization — not from a reviewer's mood. Same inputs as the tier list.
What it costs to start
Free to start- · Free to download and play — no purchase required
- · Completely free — an open-source hobby project with no shop, subscription, or monetization of any kind
- · Runs in a desktop browser via Google sign-in; no download or install
Prices and bundles change — verify on the official site ↗.
Business model
Combat
World design
Platforms
Housing
Update cadence
Profile facts verified 2026-07-22 · monetization verified 2026-07-22
Development
Review scores
Population activity
Sourced, dated observations — never an estimate. Different sources measure different things and are never combined.
No verified public player count is available. MMOlist does not estimate MMO populations — an absence of public numbers is not evidence that a game is inactive.
Data as of 2026-07-26.
Live data refreshed 2026-07-26 · refreshes daily
Gameplay profile
Editorial scales · verified 2026-07-22
Pros & cons
- ✓ AI agents and humans share one protocol — a genuinely novel experiment
- ✓ Fully open source with the design docs public; PRs welcome
- ✓ Free, instant browser access with no install
- ✓ Built by the creator of Lineage and ArcheAge
- ✗ Currently a pre-alpha tech demo, not a playable game — a first-hand look confirms it's a proof of what AI agents can do in a world (running the general store, standing guard) rather than something to actually play yet
- ✗ Solo hobby project with no roadmap or service guarantees
- ✗ Assets and music are largely AI-generated placeholders
- ✗ Barely any population or endgame yet
Best for
- AI-agent tinkerers
- Open-source contributors
- Watching an MMO built in the open
Notes & links
Source code and design docs released on GitHub July 20, 2026; the free browser build at openmmo.to.nexus is a pre-alpha tech demo (the July 20 drop was an open-source alpha release, not a launch — the game remains in development). Combat is real-time click-to-engage resolved by NetHack/D&D-style stats (4d6-drop-lowest rolls, six attributes) — filed as Tab Target pending deeper systems. Client is Svelte/Three.js, server is Rust; roughly 50 AI-generated music tracks. An experiment in AI-era MMO design, not a commercial launch.
Sources
Guilds recruiting
No guilds recruiting for Open MMORPG yet
Playing with a community? Yours could be the first listing here — an evergreen recruitment page beats weekly forum posts.
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Release tracker
Nothing currently on the calendar for Open MMORPG.
Past events (1)
Open-source release + pre-alpha browser demo
Jake Song published Open MMORPG's full source code and design docs on GitHub and opened a free browser build (Google sign-in, no install). The build is a pre-alpha tech demo — the game itself remains in development; this was not an Early Access launch. The experiment's core rule: AI agents connect through the exact same WebSocket protocol as human players, with no privileged agent API — the server cannot tell them apart.
Source: Jake Song on X ↗verified free / open to everyoneBrowserGlobal
Dates come from the sourced MMOlist release tracker — estimated windows are marked “~” and delays keep their history. Follow the whole genre on the release calendar.
Frequently asked questions
▸When does Open MMORPG release?
Open MMORPG is in development at Jake Song (solo), with release expected TBA. Planned platforms: Browser.
▸Will Open MMORPG be free to play?
Yes — Open MMORPG is planned as a free-to-play title.
OpinionJake Song is back — and his new MMO treats AI agents like players — MMOlist Editorial; never affects this page's data.
Spotted outdated or wrong info? — corrections ship fast.