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Twinning vs graftfork

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Twinning compared with graftfork
DetailTwinning logo Twinninggraftfork logo graftfork
What it doesOpen-source tool that turns an OpenAPI spec or schema into a local, runnable twin Keep your changes on every upstream release
StageNot given Not given
Founded2023 Not given
Based inUS US
Pricing modelOpen source Freemium
PricingNot given Free: 10 syncs per month, first conflict resolved free. Premium: $12/month with $6 of agent work included, up to 40 syncs per month, $10 add-ons for $7 of agent work. Team: $15 per fork per month (1-20 forks). Enterprise: by contract.
Key features
  • REST API twin generation from OpenAPI spec
  • Postgres wire protocol support
  • Snowflake wire protocol support
  • MCP server support
  • Live behavior overlay on published specs
  • One-command agent installation
  • Deterministic test responses matching live behavior
  • Automatic change carrying onto new upstream releases
  • Test-driven verification before moving changes
  • AI-powered conflict resolution
  • No write access to your repository
  • Automatic test discovery for Python and Node projects
  • Program rebuilding from specification documents
  • Early warning system for upcoming releases
  • Signed records of every sync with verification
  • Support for GitHub, GitLab, Codeberg and any git host
  • Organization-level team management with audit logs
What makes it different
  • No backend required, serves twins directly from specifications
  • Supports multiple protocols: REST, Postgres, Snowflake, and MCP
  • Production behavior fidelity through live behavior overlay
  • MIT licensed open source with no cost
  • Never moves you onto code that fails your tests
  • Keeps your branch untouched until you decide to take a move
  • No overage charges on Premium and Team plans
  • Tested with real GitHub forks and Debian/Ubuntu release history
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)27 −1 (down) since last checkNot checked yet no change since last check
Trust Flow (Majestic)50
Citation Flow (Majestic)390
Referring domains (Majestic)160

5 details filled in for both companies.

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