Bonsai vs Designcenter for BIM

Bonsai is a free, open-source family of applications for creating, reviewing, and sharing IFC models. Bonsai Studio is an IFC authoring platform built on Blender. It supports modeling, documentation, coordination, and BIM data management across disciplines. Studio can generate and annotate linked 2D drawings, then produce schedules and reports from model data. Bonsai Viewer is a separate free desktop application for reviewing IFC models, drawings, and data without the authoring environment. Viewer includes model search and filtering, clash detection, BCF issue management, federation of multiple models, and cloud synchronization for models and issues. Bonsai reads and writes native IFC and states that it has no proprietary formats or lock-in. Studio is powered by IfcOpenShell and includes Python scripting and an API. Listed workflows cover structural-analysis solver connections, MEP systems, 4D scheduling, 5D cost estimation, and COBie facility-management data. Studio and Viewer support Windows, macOS, and Linux. The Studio page labels the software alpha.

Designcenter for BIM has no write-up on Specifiction yet; its figures are above.