What this means
A hosted app on Calculator Tools is a public web app that runs in a browser. Calculator Tools stores static files on your account and serves them at a calculator.tools URL. The entry file is index.html. Extra files sit in the same directory: CSS, JavaScript, JSON, SVG, and similar static files.
The result is a calculator, tracker, converter, quiz, or small game that anyone with the link can open. There is no app-store install.
Why it matters
Many AI chats show a preview that dies when the session ends. A hosted app is the opposite. The URL stays. The files stay on your account. You can send the link. You can open it later from the dashboard.
That is the product. Not a local project folder. Not a chat attachment. Not a Node or React workspace.
How it works here
You create an app on Create, through a ChatGPT custom GPT, or through MCP. Calculator Tools saves the files and publishes a public page under /app/. MCP and the GPTs can add or update files one at a time. All filenames live in one directory. Nested folders are not supported.
Remix copies an existing public app into your account so you can change it. Ownership stays with the account that published it.
Free accounts can publish 3 apps. Pro ($5.99/month) raises the limit to 25.
Related pages
- Source - the files on the account
- Ownership - who the account holder is
- Remix - copy and edit a public app
- Session preview versus hosted public URL - why a chat preview is not this
- MCP - publish from Cursor, Claude, or ChatGPT
Sources
Ready to publish a public app you own?
Calculator Tools