What is a free AI game maker?

Every tool in the table below gives you some of it for nothing, and every one of them has the same bill underneath: each tool call your agent makes and each GDScript file it writes is model inference, and inference costs money per token. A 3D model or a sound from a generator costs money per job. So when a page says free, the useful question is not whether, it is who pays that bill and on what terms.

There are three answers. The first is a credit allowance: the vendor pays for a small monthly amount of inference, then meters you. Ziva’s Hobby plan, GDevelop’s 40 AI requests a month and Unity AI’s 14-day trial on Personal all work this way. The second is export-gated free: you can build, but downloading the project, commercial rights or removing a watermark sit behind a plan. Rosebud puts project code download on a paid plan. The third is bring your own model: the tool costs nothing and the inference runs on an account you already have, so the only bill is the one you were paying anyway.

Flockbay is the third kind. It runs on the Claude or ChatGPT plan you already pay for, on your own agent or on your own key, with a small Demo allowance to try the app first. More models are optional, a credit reload at API prices.

More on this: How to make games in Claude Code: from install to a game you can play

Your Claude plan. Pick Claude in the model menu and Flockbay runs Claude Code, Anthropic’s coding agent, behind its own chat, on Claude Pro or Max. It finds Claude Code or installs it the first time, and you sign in on Anthropic’s page. The free Claude plan does not include Claude Code, so it does not work. On Windows.

A ChatGPT sign-in. Flockbay’s chat can run on your ChatGPT subscription on Plus or higher. OpenAI refuses the Free and Go plans for this, so they do not work.

Your own agent over MCP. Claude Code, Codex, Cursor or any MCP client connects to Flockbay’s MCP server and drives the open Godot editor: scene edits with undo, running the game headless or in the Game screen, reading stdout and GDScript parse errors with file and line, injecting input events and capturing the viewport. Flockbay charges nothing for the connection; you pay your agent’s provider exactly what you pay them now. The Godot MCP guide has the setup for each client.

Your own API key (BYOK). Paste an OpenAI or Anthropic key and Flockbay’s own chat runs on it, billed by your provider per token. Generated pictures, 3D models and sound run on your own Tripo and ElevenLabs keys the same way.

Demo. Every new account gets a small free allowance on a small, low-quality model, marked Demo in the model menu, so the first build costs nothing before you choose.

More on this: Claude for Godot: how to build a Godot game with Claude Code, step by step

The engine. Flockbay bundles the official Godot 4.7.2, not a fork, so stock Godot 4.7.2 opens the same folder.

The project. It is a real Godot project on your disk: .tscn scenes, GDScript, your assets. There is no export gate, no watermark and no revenue share, and it keeps existing if you stop using Flockbay.

The builder. The terrain, foliage, prop, water, sky and weather tools are buttons around the Godot editor’s own 3D and 2D view, with the editor’s undo. They make no model calls, so hand-building a level costs nothing on any plan.

Playtesting. The game runs locally on the bundled Godot. Pressing Play, and the runs your agent starts to check its own work, cost nothing beyond the tokens the agent spends reading the results.

More on this: How do I use Flockbay with my own AI agent?

Inference, anywhere. Someone pays for tokens: you through your agent, key or ChatGPT plan, us through a Flockbay plan, or the vendor for a few dollars of credits a month.

Offline building. The chat, asset generation and world data come over the network, so building needs a connection. Playing the game you built does not.

Every platform. Flockbay runs on 64-bit Windows today, and the Mac release follows later. On a Mac or Linux machine today, Ziva or the free Godot AI add-on with your own agent is the free route.

The app’s source. Flockbay is closed source. The engine is Godot and the project is yours; the app that builds it is ours.

More on this: How to make games in Codex: the Codex CLI, the ChatGPT app, or your ChatGPT plan inside Flockbay