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Mantyl Review

Mantyl is a CLI tool for AI-first builders that provides verifiable proof and transparency for AI-built software projects through a project passport.

shipped Sep 1, 2026agentsfreemium
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Mantyl — product screenshot

Why it matters

1Offers a free local-first CLI with no account required for core functionality.
2Generates a verified project passport compiling repository, coding-agent history, and executed checks.
3Supports multiple AI agents including Claude Code, OpenAI, Gemini, Cursor, and Codex.
4Provides independent verification of delivered projects, with a paid 'Mantyl Verified' service priced at £19–£49 per project.

About Mantyl

Business Model
Freemium SaaS
Usage Pricing
£19–£49 per project
Headquarters
UK
Platforms
CLI
Target Audience
AI-first builders, software developers

Pricing Plans

CLI
£0 FOREVER / lifetime
  • • Local-first CLI
  • • Unlimited projects
  • • Scan, verify, generate and receive
  • • passport.json stays an open format
Hosted passports
£0 DURING ALPHA / lifetime
  • • One command publishes an approved passport
  • • Shareable link with the full report
  • • Server re-checks schema and digest
  • • Unpublish any time with your delete token
Mantyl Verified
£19–£49 PER PROJECT, BY SIZE / per project
  • • Independent re-execution on clean infrastructure
  • • Every recorded check reproduced in a fresh sandbox
  • • Signed accreditation, publicly checkable offline
  • • The mark on your hosted passport

Cost Examples

  • • One credit per project

Specs

API Docs

View Documentation →

GitHub

View Repository →

API Available

Yes, public API

overview

What is Mantyl?

Mantyl is an AI code handover tool that enables AI-first builders to deliver AI-built software along with proof of independence through a verified project passport. It compiles a project's repository, coding-agent history, and executed checks into a recipient-ready handover document, addressing "transfer debt" in AI-driven development.

features

Key Features of Mantyl

Mantyl provides a suite of features designed to ensure transparency and verifiability in AI-built software projects, focusing on an evidence-based approach for project handovers.

  • Free local-first CLI for unlimited projects, requiring no account for core functionality.
  • Generates a verified passport.json project passport, an open format document.
  • Supports multiple AI agents including Claude, OpenAI, Gemini, Cursor, Codex, and Lovable.
  • Every assertion within the project passport links directly to evidence from the repository, execution output, or configuration.
  • Clearly states the scope and limitations of what was checked, when, and against which commit.
  • Offers independent verification of delivered projects through the 'Mantyl Verified' paid service.
  • Compiles repository data, coding-agent history, and executed checks into a single handover document.
  • Multimodality support for text and audio data within agent histories.
  • API available for programmatic interaction and integration into existing workflows.
  • Privacy policy states that user data is never used for training.

use cases

Who Should Use Mantyl?

Mantyl is primarily designed for professionals and organizations involved in the development and transfer of AI-assisted software, aiming to enhance trust and accountability.

  • AI-first builders and freelancers: To deliver AI-assisted software with verifiable proof of independence and integrity to clients.
  • Clients receiving AI-built software: To independently inspect build output, test runs, and configuration, ensuring transparency and understanding project scope and limitations.
  • Agencies and teams: For streamlining software handover processes by providing a verifiable artifact that recipients can re-run and check.
  • Developers integrating into CI workflows: To continuously regenerate project passports on every push, accumulating evidence throughout the project's lifecycle.
  • Auditors and compliance officers: For establishing an evidence chain for AI-built projects, linking claims to repository evidence and execution output.

how to use

How to Use Mantyl

Mantyl operates as a local-first CLI tool, allowing users to scan their repositories and AI agent histories to generate a project passport. The process involves initializing Mantyl within a project and executing commands to build the handover document.

  • 1Install the Mantyl CLI tool locally on your development machine.
  • 2Navigate to your project's root directory in the terminal.
  • 3Initialize Mantyl within your project to set up the necessary configuration.
  • 4Run Mantyl commands to scan your repository, collect coding-agent history, and execute defined checks.
  • 5Generate the passport.json handover document, which can then be shared with recipients.
  • 6Optionally, submit a passed run for independent verification via the 'Mantyl Verified' service for a signed accreditation.

pricing

Mantyl Pricing & Plans

Mantyl offers a freemium model, providing core CLI functionality for free, with additional paid services for hosted passports and independent verification.

  • CLI: £0 FOREVER. This tier provides the local-first CLI tool for generating project passports without requiring an account.
  • Hosted passports: £0 DURING ALPHA. This service is currently free during its alpha phase for hosting generated project passports.
  • Mantyl Verified: £19–£49 PER PROJECT, BY SIZE. This paid service offers independent re-execution of recorded checks on clean infrastructure and provides a signed accreditation on the project passport. Pricing varies based on project size.

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Pros

  • +Provides verifiable proof of independence for AI-built software, enhancing trust.
  • +Local-first CLI with no account required for core functionality, ensuring privacy and immediate access.
  • +Supports a wide range of AI agents including Claude, OpenAI, Gemini, Cursor, and Codex.
  • +Generates an open-format passport.json document, ensuring inspectability by recipients.
  • +Integrates into CI workflows for continuous evidence accumulation throughout a project's lifecycle.
  • +Offers an optional paid service for independent, third-party verification of project integrity.

Cons

  • −The 'Mantyl Verified' service is a paid feature, adding cost for independent accreditation.
  • −Requires CLI usage, which may have a learning curve for users unfamiliar with command-line tools.
  • −Python support for executed checks was in beta with version 0.6.0, indicating ongoing development for language-specific features.
  • −The 'Hosted passports' service is currently in alpha, suggesting potential changes or limitations.

Policies

Pricing Page

View Pricing→

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