A holding company for durable software.

Loop21 builds and operates small, focused projects with one property in common: past work keeps earning. We favor compounding assets over linear labor. We ship under our own name only when it helps the project.

• AI → Bitcoin ROI Index

  Open dataset tracking capital efficiency across Lightning-native AI services.
  Live
• BOLT12 Tools

  In-browser decoder and TLV inspector for the Lightning BOLT12 spec.
  Live