That Open Company

free / open source (MIT and MPL-2.0) core libraries; a hosted "That Open Platform" and a paid custom-app development service exist alongside, with pricing not publicly disclosed for either Produce & Issue Documents

Open-source "AECOsystem" of JavaScript/TypeScript engine libraries (web-ifc, @thatopen/components, @thatopen/fragments, @thatopen/ui) for building browser-based, native-IFC BIM applications -- a WASM-speed IFC parser, a compact binary "Fragments" format for fast loading of huge models, and Three.js-based UI building blocks (viewers, clipping planes, measurement, DXF export) -- plus an emerging hosted "That Open Platform" (private beta) and a paid custom-BIM-app development service.

4.0 /5 composite score

C1 4/5 reflects the usable free and open-source core libraries, C2 4/5 reflects the documented TypeScript and JavaScript APIs plus CLI, and C4 5/5 reflects full IFC2X3 and IFC4 support with DXF export. The surface is a developer SDK for BIM applications rather than a turnkey end-user authoring tool.

Worth it

Rubric Scorecard

How we grade →

Criterion	Score	Evidence
Value for the price	4/5	free / open source (MIT and MPL-2.0) core libraries; a hosted "That Open Platform" and a paid custom-app development service exist alongside, with pricing not publicly disclosed for either, from $0, free tier
Agent Friendliness	4/5	CLI, API: Full open-source TypeScript/JavaScript library API (web-ifc, @thatopen/components, @thatopen/fragments, @thatopen/ui); a separate thatopen CLI and API-token auth exist for the commercial, private-beta That Open Platform Source →
Ease of adoption	4/5	web-saas, moderate learning curve
Portability & lock-in	5/5	3 file formats, export: bulk Source →
Interoperability	3/5	1 integrations

Pricing

Modelfree / open source (MIT and MPL-2.0) core libraries; a hosted "That Open Platform" and a paid custom-app development service exist alongside, with pricing not publicly disclosed for either

Entry price$0

Free tieryes

Free vieweryes

Free tier scopeusable

Visit That Open Company →

How we verified this: we checked That Open Company against its live site and an independent source — github.com. Nothing on this page is listed from memory. See how we grade. Verified 2026-07-03.

Evidence

File formats

Format	Direction	Support
IFC2X3	both	full
IFC4	both	full
DXF	export	partial

Integrations

Three.js (native)

Adoption

Deploymentweb-saas

Self-serve signupyes

Implementation requirednone

SSO/admin requiredno

Training requiredtutorials

Learning curvemoderate

Data export

Export mechanismbulk

Export scopeall-data

Ecosystem

Plugin marketplaceno

Sources

API docs CLI docs Formats

Also covers

That Open Company also appears in these sub-categories:

BIM Coordination

The BIM-coordination placement is tied to the Fragments format and Three.js-based component stack rather than a packaged coordination application. C2 4/5 reflects the documented TypeScript and JavaScript APIs plus CLI, and C4 5/5 reflects IFC2X3 and IFC4 support.

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