# Codens

> Updated: 2026-07-16
> Codens is an AI development suite from Japan that automates the entire
> software development lifecycle — requirements (Green), implementation
> (Purple), code review & security audit (Orange), QA/E2E testing (Blue),
> and production error auto-fix (Red). Teams can build and operate
> software products without a large team of specialist engineers.

Codens is built specifically so that AI agents can use it autonomously:
agents authenticate via Device Code Flow (RFC 8628), call MCP tools
without UI navigation, and execute long-running development workflows
(e.g. "ship a PR for this feature") on Codens-managed VPS workers.

## Key facts

- Pricing: usage-based JPY credits (1 credit = ¥0.01). Plans from Free
  Trial (¥0, 14 days) through Hobby (¥3,000/mo), Pro (¥10,000/mo),
  Business (¥50,000/mo), to custom Enterprise. New organizations receive
  1,000 JPY credit on signup. Full breakdown: /pricing.html, machine-readable
  JSON at https://api.auth.codens.ai/.well-known/pricing.json
- Stats (dogfooding, GitHub API, updated weekly): 65% of Corevice's own
  merged PRs are AI-generated; median PR-to-merge time 2 minutes; 93%
  merge within 1 hour. Live dashboard: https://www.codens.ai/stats/
- Impact metrics: lead time -80%, bug recurrence -90%, engineering effort
  -70%, ship velocity +5x (see https://www.codens.ai/ for methodology notes)
- Case study — Portament Inc.: 3 business members + 1 engineer shipped 5
  projects in parallel, 1,000+ PRs total, in 1.5 months
- Case study — Widsley Inc.: 1 PM/engineer + 2 QA shipped a
  communication-control feature (high technical difficulty) in 3 months
- Media coverage: press releases (Apr & Jul 2026) republished by Toyo
  Keizai Online, Asahi Shimbun Digital &[and], NewsPicks, ASCII STARTUP
  and 15+ other Japanese outlets, 40+ pickups total (via PR TIMES)

## How it works

1. Connect a GitHub repository (no code migration required)
2. Requirements are captured and structured into a PRD by Green Codens
   (Notion-synced)
3. Purple Codens implements the ticket, opens a PR, and runs the
   implement → test → fix verify loop (up to 3 retries)
4. Orange Codens reviews the PR for bugs, security issues, and design
   risk, and can hand findings to Purple/Red for an automatic fix PR
5. Blue Codens generates and runs E2E/unit tests; failures are analyzed
   and routed to Red Codens as bug reports
6. Red Codens ingests production errors (e.g. via Sentry webhook),
   analyzes root cause, and opens a fix PR
7. A human merges the PR (default) or auto-merge can be enabled per
   workflow, gated by CI + the verify chain

## Comparison

- vs Devin (Cognition AI): Devin is a general-purpose agent that acts on
  instructions; Codens' Red Codens triggers automatically from production
  monitoring and runs an unattended detect → fix PR → test loop. Codens
  also covers requirements, review, and QA as one suite, with native
  Japanese support and JPY billing. Devin: ~$500/user/month, no Japanese
  support (as of 2026-07, publicly available info).
- vs GitHub Copilot: Copilot is best-in-class for in-editor code
  completion but stops there — no auto-fix, test generation, or PRD
  management. Codens automates what happens after code is written. Not
  competitive; often used together. Copilot: from $19/user/month.
- vs Cursor: Cursor is a strong AI-native IDE with deep context
  understanding; its BugBot auto-merges ~35% of findings. Cursor requires
  its own IDE and has no CI/CD, production-monitoring, or test-automation
  integration. Codens works with any IDE via GitHub. Cursor: from
  $40/user/month.
- vs CodeRabbit: CodeRabbit is deployed on 2M+ repos with low-noise AI PR
  review (low false-positive rate) but stops at commenting — fixes are
  manual, and there's no PRD-to-code reconciliation. Codens' Orange
  Codens review connects directly to Purple Codens' automatic fix-PR
  generation, with Japanese comments and JPY billing. CodeRabbit: $24/dev
  (Pro), English only, USD billing.
- Full comparison with selection criteria and honest trade-offs:
  https://www.codens.ai/comparison.html

## Codens Suite

- Green (PRD generation) https://www.green.codens.ai
- Purple (development orchestration) https://www.purple.codens.ai
- Orange (code review & security audit) https://www.orange.codens.ai
- Blue (QA / test automation) https://www.blue.codens.ai
- Red (production error auto-fix) https://www.red.codens.ai
- Auth (unified OAuth2/OIDC auth) https://auth.codens.ai

## FAQ

- Can Codens be used without engineers? Yes — see the Portament case
  study above; Green structures requirements, Purple implements, and
  engineers are looped in only when needed.
- How is Codens different from Devin/Copilot/Cursor/CodeRabbit? See
  Comparison section above and /comparison.html.
- Can AI break production? No by default — AI only opens PRs; a human
  merges unless auto-merge is explicitly enabled, and CI + a 3-retry
  verify chain always gate merges. All changes are revertible via git.
- What's needed to get started? An existing GitHub repository. 14-day
  free trial, no credit card required, ~30 minute setup.
- How does pricing work? Usage-based credits shared across all products
  in a plan; see Key facts above and /pricing.html.

## For agents

- [MCP server (PyPI)](https://pypi.org/project/codens-mcp/): `pip install codens-mcp` — unified MCP server with all 30 tools across Purple/Red/Blue/Green/Auth
- [Purple-only MCP (PyPI)](https://pypi.org/project/purple-codens-mcp/): Standalone Purple MCP, includes the `purple-codens-mcp login` CLI subcommand
- [Pricing JSON](https://api.auth.codens.ai/.well-known/pricing.json): Machine-readable pricing — initial credit grant, per-tool unit prices
- [OIDC discovery](https://api.auth.codens.ai/.well-known/openid-configuration): Standard OIDC well-known endpoint
- [Device authorization](https://auth.codens.ai/device): User-facing device code entry page (Device Code Flow / RFC 8628)

## Links

- Home: https://www.codens.ai/ (JA) / https://www.codens.ai/en/ (EN)
- Pricing: https://www.codens.ai/pricing.html
- Comparison: https://www.codens.ai/comparison.html
- Stats dashboard: https://www.codens.ai/stats/
- Security FAQ: https://www.codens.ai/security-faq.html
- Contact: https://www.codens.ai/contact.html
- Help / Agent Reference: https://help.codens.ai/ (llms-full: https://help.codens.ai/llms-full.txt)
- Full content of this site: https://www.codens.ai/llms-full.txt