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Kiro vs MySpec

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Kiro publishes a starting price ($20); MySpec does not. Both have a free tier.

KiroAWS's spec-driven agentic dev environment: a prompt becomes requirements, a design and sequenced tasks.MySpecInterviews you about a feature, then writes constitution, requirements, solution and task files

Side by side

FactKiroMySpec
CategoryAI Code Editors & IDEsDocumentation Generators
Pricing modelFreemiumFree
Starts at$20 month—
Public APINoNo
PlatformsWeb, macOS, Windows, LinuxWeb
CompanyAmazon Web Services—
Launched2025—
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

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

Which one fits

Choose Kiro if you need

  • Large existing codebases where a chat assistant loses the thread
  • Teams that want a reviewable plan before an agent starts editing
  • Developers already inside the AWS account and identity ecosystem

Choose MySpec if you need

  • Developers using Claude Code, Cursor or similar who want a spec before generation
  • Teams adding a feature to an existing codebase and needing a scoped delta
  • Anyone tired of agents inventing requirements mid-build

More comparisons

All Kiro alternatives →All MySpec alternatives →Browse all AI Code Editors & IDEs →