Prosper Self-hosted Launching 20 Oct

Describe a game. Prosper builds it.

A self-hosted AI game builder for 2D and 3D web games. It splits your idea into parts, has models write each one, checks every part, plays the result in a headless browser and repairs what fails.

Phaser for 2D · three.js for 3D · Runs on your own server
Prosper · Conductor UnitsSpecEvents
Prosper's Conductor screen: a game brief on the left and the eight build units it was split into on the right, each with its status.
How a build works

From brief to playable game

Every step is checked. A game only counts when a headless browser can actually play it.

  1. SpecTitle, genre, platform and description.
  2. DecomposeSystems, scenes, assets and glue.
  3. BuildModels write each unit, with fallbacks across providers.
  4. VerifyImports resolve, exports exist, scenes connect.
  5. MergeUnits bundle into one game.
  6. Play gateA headless browser boots it and reaches play.
  7. RepairAn agent fixes what fails until it passes.
Built by Prosper

Games that passed the play test

Finished builds exactly as the pipeline produced them, captured mid-play.

Prompt-to-game is in beta: games boot and play, but don't always match the brief yet. Templates are gate-tested by hand.

Start from a template that already plays

Hand-built templates, each tested in a real browser. A build can start from one and change it.

44/45templates pass the play gate19 in 3D: racing, platformer, dungeon, tower defense, survival, city builder and more

Add-ons you snap on

About 99 packs, plus a shared 3D runtime for loading, audio, input, cameras and multiplayer.

LeaderboardsAchievementsDaily challengesWeatherDay & nightExtra wavesGhost lapsPerf overlay

Every asset licensed, every build audited

CC0 art packs, music, sound and fonts. Each file carries a licence record.

⚖ licence audit build #418
✓sprites · Kenney CC0
✓music loops · CC0
✓fonts · OFL
✓ Safe to sell

Sell what you make

Built-in licensing: a payment becomes a PIN, the PIN becomes a signed licence tied to the machine.

$Payment
PINActivate
RS256Licensed
Launching 20 October

Be first in line on launch day.

Also from us

PROLU

Self-hosted governance for AI agents: verify the code they write, limit what they can touch, and keep a record nobody can quietly edit.

Your agents act.
Prolu keeps the receipts.

Gate · verify code Warrant · limit authority Ledger · record decisions Harbour · run agents Proof · data rights Bench · evaluate agents
0/27

false alarms on clean changes

Gate benchmark

8/8

kinds of tampering caught offline

Ledger test matrix

20

agent framework adapters

Warrant · Go & Python

0

steps repeated after a crash

Harbour two-phase commit

The stack

Use one, or all of them.

Each installs with a single script and works on its own. Together they share one signed record.

VERIFY CODEGo · CLI
MCP tool · GitHub App

Gate

Reviews AI-written changes and decides approve, review or reject, with reasons a person can read and a suggested fix.

LIMIT AUTHORITYMCP + A2A gateway
20 adapters

Warrant

Gives each agent a short-lived permission that covers only the job at hand. A stolen token is useless without its key.

RECORD DECISIONSPostgres · Ed25519
EU AI Act evidence

Ledger

An append-only, hash-chained log that anyone can verify offline.

RUN AGENTScrash-safe
approval gates

Harbour

Long agent jobs that pause for approval and survive crashes without repeating side effects.

PROVE DATA RIGHTSNode.js 22+
HF dataset cards

Proof

Signed evidence of what your crawler fetched and whether it was allowed to.

EVALUATE AGENTSpass@k
free forever

Bench

Turns your own repository's bug fixes into a private eval, then scores Claude Code, Codex, Cursor and Aider on it, with confidence intervals instead of a single lucky number.

Pricing · USD

Free to start. Pay when your team relies on it.

You run everything yourself. A license key unlocks paid features, offline.

Community
$0

For individuals, open-source projects and evaluation.

  • All six products, core features
  • Gate on public repos
  • Proof capture and verify at any volume
  • Community support on GitHub
Download
Team Most popular
$200 / dev / year

Gate for teams shipping AI-written code every day.

  • Private repos and org-wide policy
  • Single sign-on for the Gate dashboard
  • Email support
  • Or $20 / developer / month
  • Proof Starter $990 / year, Pro $2,990 / year
Buy Gate Team
Enterprise
Custom

The whole governed-agent stack under one contract.

  • Compliance evidence exports
  • KMS signing and locked S3 archive
  • Scale-out workers and multi-tenant
  • Priority support and invoicing
Talk to us
ProductCommunityPaidEnterprise
Gate$0Public repos, solo developers$200 / dev / yearTeam · or $20 / dev / monthCustomAudit export
Proof$0Capture, verify, report$990 / yearStarter: certificates, PDF · $99 / month$2,990 / yearPro: adds re-checks, 1-year retention · $299 / monthFrom $15,000 / yearMulti-org portal, legal holds
Ledger$0Full log and verification—CustomCompliance exports, KMS, S3 archive
Warrant$0Tokens, gateway, adapters—CustomGateway tool filtering
Harbour$0Up to 2 workers per server—CustomScale-out workers
Bench$0Everything——

Buy a license

Gate Team$200 per developer / year
Proof Starter$990 / year · certificates, PDF
Proof Pro$2,990 / year · adds re-checks, 1-year retention

Pay by US bank transfer (ACH). You get an exact amount to send, and your license key is emailed automatically within minutes of the money arriving. For invoiced or Enterprise purchases, use the form below.

Invoiced purchases

Pay by invoice and bank transfer.

Most companies buy this way. It takes three steps.

  1. Tell us what you needProducts, seats and billing details.
  2. Get a quote, then an invoicePay by ACH, wire or FedNow.
  3. Receive your license keyIt works offline for the whole term.
Email proluog@gmail.com

Give your agents limits, and yourself a record.

Install one product in a few minutes · Source on GitHub