What is Cube?
Cube is a set of agent-native UI components. Each component, starting with a job application form, is readable by a person in a browser and operable by an AI agent over HTTP or through an MCP connector. The site publishes the form's fields as JSON Schema and Markdown, so an agent can fill it in on a person's behalf, following the rule that it only sends what the person has provided.
The components are copied into your application rather than hosted by Cube, so your data stays in your own systems. Submissions reach your code directly. The project is listed as open source under the MIT license, with the source on GitHub. Besides the forms component, the page lists booking, table and document components with suggestions as coming soon.
Key features
- Forms readable by people in a browser and fillable by agents over HTTP
- MCP connector with read_form and submit_form tools
- JSON Schema and Markdown versions of each form
- Copy-in components so data stays in your own app
- Open source under the MIT license
- Booking, table and document components listed as coming soon
Who is it for
- Developers building forms into their own apps
- Teams wanting forms that AI agents can also complete
- Open source contributors
Pros and cons
- Open source under MIT, source on GitHub
- Your data stays yours because components are copied into your app
- Booking, table and document components are not yet available
Cube pricing
The vendor does not publish prices in a readable form (often pricing is shown only after signing in).
Is Cube free?
The vendor does not state this clearly on the homepage or pricing page.
Cube alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Google Workspace Gemini | 31.50 PLN/mo | trial | Productivity & notes |
 Granola | 14 USD/mo | yes | Productivity & notes |
 Raycast | not listed | yes | Productivity & notes |
 Notion | 9.50 EUR/mo | trial | Productivity & notes |
 Figma AI | 3 USD/mo | yes | Productivity & notes |
 Fyxer | 37 USD/mo | trial | Productivity & notes |
FAQ
What is Cube used for?
Open source UI components (forms first) that both people and AI agents can read and operate, copied into your own app.
Is Cube free?
The vendor does not state this clearly on the homepage or pricing page.
How much does Cube cost?
The vendor does not publish prices publicly or requires sign-in.
What are the best Cube alternatives?
Closest alternatives: Google Workspace Gemini, Granola, Raycast, Notion, Figma AI.
Data checked October 14, 2026 on the vendor website (ui.usecube.io).