Kiro vs MySpec

Kiro

The spec step is the whole argument: forcing a prompt through requirements, design and a task list before code is written gives you a review point that chat-based assistants never offer, and it holds up better on large codebases. Property-based testing and hooks are real additions rather than checkbox features. Credit metering means the advertised tier price is a floor, not a ceiling.

Pros

• +Specs turn a prompt into reviewable requirements, design and ordered tasks
• +Property-based test generation catches cases hand-written unit tests miss
• +Parallel agents work on separate tasks in the same session
• +Hooks run background jobs like test reruns and doc updates automatically
• +Available as IDE, CLI, web and mobile across Mac, Windows and Linux
• +Free tier of 50 credits a month that does not expire

Cons

• −Everything is credit-metered, so heavy agent runs outpace the tier price
• −The free 50 credits are enough to evaluate and little else
• −Top-up credits cost $0.04 each, which adds up quickly at agent scale
• −No public API for driving Kiro from outside its own surfaces
• −The spec workflow is overhead on small, well-understood changes

MySpec

Spec-driven development is the current answer to agents that build the wrong thing confidently, and MySpec is a clean implementation of it: a real interview, four files with distinct jobs, and testable EARS+ requirements instead of prose. The MCP server matters — the spec lands where the agent already works. It is an unlimited free beta right now, which also means the pricing you eventually pay is unknown.

Pros

• +Four distinct output files rather than one blob, each with a defined job
• +Requirements use the testable EARS+ when/if/then format instead of prose
• +Brownfield mode reads an existing codebase and scopes the change rather than restating the whole system
• +MCP server connects it to Claude Code, Cursor and Claude Desktop
• +Live Mermaid rendering for flowcharts, ER and sequence diagrams

Cons

• −Open beta, so nothing about stability, support or eventual price is settled
• −No company name, country or team disclosed anywhere on the site
• −The interview adds real time before any code gets written
• −Announced Pro and Team tiers have no published figures

Is Kiro cheaper than MySpec?

MySpec is free to use; Kiro starts at $20/mo.

Does Kiro or MySpec have a free tier?

Both: Kiro has a free tier, and MySpec is free to use.