Ship better code. Every time.
Battle-tested prompts for code review, documentation, architecture decisions, and debugging. Multi-model execution means you always get the best result.
One API call. Expert-level output.
a21e is to prompts what a compiler is to assembly. Drop-in compatible with the OpenAI API.
curl https://api.a21e.com/v1/execute \
-H "Authorization: Bearer a21e_your_key" \
-d '{
"input": "Review this PR for security issues",
"model_tier": "standard"
}'Works with any HTTP client. SDKs for JS, Python, Go, Rust, and C#.
Built for the way you work
Every prompt is purpose-built for developer workflows. No generic output.
Code Reviews
Get consistent, thorough reviews that catch bugs, suggest improvements, and enforce your team's conventions.
Architecture Decisions
Evaluate trade-offs, document ADRs, and get recommendations grounded in your stack and constraints.
Documentation Generation
Generate accurate docs from code. READMEs, API references, inline comments — all matching your style.
Debugging Assistance
Describe the symptom, get structured root-cause analysis with suggested fixes ranked by likelihood.
API Design
Design REST, GraphQL, or RPC interfaces with consistent naming, versioning, and error handling patterns.
Test Generation
Produce meaningful test cases — unit, integration, E2E — that cover edge cases, not only happy paths.
Fits into your stack
Use a21e from wherever you write code. CLI, editor, API, or MCP — your choice.
CLI
Run a21e from your terminal. Pipe in code, get results.
VS Code Extension
Right-click enhance. Inline suggestions. Zero context switching.
MCP Plugin
Give your AI coding assistant access to a21e tools over MCP.
REST API
Full API with JSON-RPC and OpenAI-compatible shim.
5 SDKs
JavaScript, Python, Go, Rust, C#. First-class support for each.
Better code starts here.
Stop writing prompts from scratch. Get expert-level AI output tuned for developers. $5 to start.