Plans and limits
Teskooano is free to use. A free account lets you keep systems, and the paid plans add room and tools on top. Every guide on this site starts with a badge saying who it’s for:
- Free, no account needed: anyone can use it, signed in or not.
- Free with an account: sign in with GitHub. It costs nothing.
- Paid plans, or a named plan such as Explorer and above: needs that plan or a higher one.
Prices, Lifetime and the launch offer are on the plans page.
What each plan includes
Systems
| Feature | Free | Adventurer | Explorer | Pioneer | Status |
|---|---|---|---|---|---|
| Handcrafted catalogue | Showcase systems, more with an account | + paid systems | Same | Same | Live |
| Generated systems | Any seed, within the body limit | Same | Same | Same | Live |
| The system editor | Build and try; no save or download | Save and download | Same | Same | Coming; MCP today |
| Kinds of body you can add | Main-sequence stars, everyday planets | Every kind | Same | Same | Coming |
| Advanced data layers | No | Yes | Yes | Yes | Coming |
| Saved systems | 5: copies, imports and seeds | 250 | 1,000 | 2,500 | Coming; today 100 |
| Storage | 5 MB | 100 MB | 1 GB | 2 GB | Coming |
| Versions kept per system | 3 | 25 | 100 | 250 | Coming; today all |
On Free, the editor is a sandbox: build and try a system there, but saving it or downloading its file needs a paid plan. Your 5 free saved systems come from copying catalogue systems, importing files and saving generated seeds.
Free systems are made from the everyday kinds of body: main-sequence stars, and rocky, barren, desert, terrestrial, ocean and ice planets, gas giants, moons, asteroids and comets. The exotic kinds need a paid plan:
- black holes, neutron stars, pulsars and magnetars;
- Wolf-Rayet and carbon stars, giants and supergiants, white dwarfs, brown dwarfs and hot subdwarfs;
- iron and lava worlds;
- nebulae and bodies from fiction.
This applies everywhere a system is made: on Free the generator, the editor, imports and MCP all stick to the everyday kinds. You can still open and explore every catalogue system your plan includes, exotic bodies and all.
New catalogue systems open to paid plans first, then to every account after about 90 days. Systems from fiction are never paid, and Sol, TRAPPIST-1 and Kepler-16 are open to everyone, signed in or not.
Simulator
| Feature | Free | Adventurer | Explorer | Pioneer | Status |
|---|---|---|---|---|---|
| Frame rate | Up to 60 FPS | Uncapped | Uncapped | Uncapped | Coming; uncapped today |
| Quality profiles | Up to High | All, with Cosmic | Same | Same | Coming; open today |
| Engine views open at once | 2 (1 signed out) | 3 | 6 | Your device | Coming; no limit today |
| Bodies in a system | 15 | 100 | 250 | Your device | Coming; no limit today |
| Physics integrators | Standard | Standard | High-accuracy | All | Coming |
| Photo mode | Screen-size captures | Up to 4K | 4K, 1080p video | 8K, export | Screen size live; rest coming |
| Saved cameras and views | No | 50 | 200 | 500 | Coming |
| Camera paths and grand tours | The built-in Grand Tour | - | Record and share | Same | Tour live; recording coming |
| Projects and tab groups | No | No | 10 | 100 | Coming |
The body limit is a hard cap on every system you make, whichever way you make it: the generator, the editor, an imported file or an AI assistant over MCP. On Free that is 15 bodies, signed in or out; editing needs an account. Catalogue systems are the one exception: they open whole on every plan.
Data and API
| Feature | Free | Adventurer | Explorer | Pioneer | Status |
|---|---|---|---|---|---|
| MCP server for AI assistants | Read-only | All tools | Same | Same | Live; all tools today |
| API units a month (MCP, API and CLI) | 300 | 3,000 | 10,000 | 30,000 | Coming; not counted today |
| Imports from real data sources | 3 a day | 20 a day | 75 a day | 200 a day | Coming; no limit today |
| Personal API tokens and the CLI | No | Yes | Yes | Yes | Coming |
Lifetime includes everything in Pioneer for good, every app update free, and 12 months of Pioneer-level API access and cloud storage. After that, the optional Cloud add-on keeps them, since they’re what costs us money to run. The Developer licence, for building on the engine itself, is shown on the plans page but not on sale yet.
Always free
- The whole simulator: N-body physics, every kind of star and planet, the Grand Tour, photo mode and installing it as an app.
- Elite Dangerous and EVE Online systems, when they arrive, for any signed-in account. Their makers only allow non-commercial use, so they will never be part of a paid plan.
- Downloading any system you can open, and a copy of your data at any time.
Technical limits
These hold on every plan, today.
Systems and files
| Limit | Value |
|---|---|
| One system file | 1 MB |
| System names | 80 characters |
| System descriptions | 500 characters |
| Saved systems per account | 100, until the plan limits above go live |
| Lists on the site and over MCP | 50 systems a page |
| Sign-in | GitHub only |
A system file is the JSON the site’s Download buttons give you. Files from older versions of Teskooano are upgraded when they’re opened.
The simulator
| Limit | Value |
|---|---|
| Browser | A current Chrome, Edge, Firefox or Safari with WebGL 2 |
| Gravity | Summed exactly between every pair of bodies up to 2,048 bodies; an octree (Barnes-Hut) approximates it above that |
| Lights | Up to 8 stars light each body |
| Planet surface cache | 256 MB in the browser (64 MB on phones), so systems you’ve seen load faster |
| Phones | Bloom off, a lower rendering resolution, fewer asteroid rocks and smaller planet surfaces |
How large a system runs smoothly depends on your computer and its graphics card. Renderer Info in the Developer tools shows what yours is doing.
MCP and analysis
| Limit | Value |
|---|---|
system_simulate length |
Up to 1,000 simulated years |
system_simulate work |
10 million body-steps a call; longer runs stop early and say so |
system_simulate samples |
Up to 200 snapshots of positions |
See Connect an agent for every tool.
If your plan ends
Your plan runs to the end of the month or year you paid for, then drops to Free. Nothing you saved is deleted: anything over the free limits becomes read-only until you upgrade again. See the refund policy and terms.