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Line0

The First AI Pair Programmer for Backend Development·line0.dev

Line0 is an AI pair programmer that helps backend developers generate production-ready Express.js backend services from natural language descriptions. It offers an in-browser code editor, two-way sync with GitHub repositories, and a built-in API client for testing generated endpoints with hot-reloading and live database previews. Users can split feature development into separate chats and import existing GitHub projects to continue building with AI assistance.

What it's for

Generate production-ready backend services from natural language promptsBuild Express.js backend services with AI assistanceEdit generated project code directly in a browser-based editorSync generated code two-way with a GitHub repositoryImport and continue building on existing GitHub repositoriesTest newly generated APIs directly in the browser without external toolsPreview and test with live, auto-provisioned database data

Features 13

'Enhance' prompt assistance
Automatic code sync after each commit
Built-in API client for testing generated APIs (coming soon)
Choose a dedicated working branch per project
Full in-browser project code editing
Hot-reloading of newly generated backend code
Import existing GitHub repositories/projects
Live database preview with auto-provisioned database per service
Natural language backend generation
No external tools (Postman/curl) required for API testing
Split features into separate chats per feature
Tab-to-autocomplete prompting
Two-way sync with GitHub

At a glance

free tier

TypeWeb app

DeploymentCloud

PlatformsWeb

Forbackend developers

CompanyVratix

Integrations

GitHub

Pricing

Pricing page shows an Individual/Team toggle and a Monthly/Annual billing toggle with a 15% annual discount; the displayed Plus ($17) and Pro ($85) prices are labeled 'Billed yearly', so they may reflect the annual-billed monthly-equivalent rather than a standalone monthly rate. Exact standalone monthly prices are not shown.

FreeFree

Billed yearly notation shown alongside $0/month.

Daily message limits; create up to 10 public projects

Plus$17/mo · billed annually

Price shown as $17/month + local tax, billed yearly; a 15% annual savings toggle is offered on the pricing page, so this figure may represent the annual-billed monthly equivalent.

150 messages per month

Pro$85/mo · billed annually

Price shown as $85/month + local tax, billed yearly; a 15% annual savings toggle is offered on the pricing page, so this figure may represent the annual-billed monthly equivalent.

2000 messages per month

Save 15% with annual billing (toggle labeled 'Saving 15%').