REOP, the Real Estate Open Protocol, is an open, vendor-neutral JSON standard for new-development (off-plan / pre-sale) real estate data: one document shape from developer systems to marketplaces, portals and AI agents.
Current version: 1.4.0 (released 2026-10-22).
| Protocol repository (schema, OpenAPI, vocabularies, examples, migration guides) | REOP-IO/reop-protocol |
| Latest release with downloadable schema and OpenAPI | v1.4.0 |
| Published JSON Schema | https://reop.io/schema/1.4.0/reop.schema.json |
| Website | reop.io |
| API reference of the reference implementation | api.reop.io/api-docs |
| A marketplace built on REOP | app.reop.io |
Developer -> Project -> Building -> Floor -> UnitModel -> Unit: decoupled inventory, multilingual text, media as objects, inventory synchronisation (InventoryUpdate), versioned and extensible (protocol.version, extensions).
Proposals and questions: Issues and Discussions on the protocol repository (CONTRIBUTING). Commercial inquiries: info@reop.io. License: MIT.