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Terrastruct Shuts Down and D2 Becomes a Non-Profit Under Hack Club, Killing an Open-Core Diagramming Business
On 2026-09-05 D2's creator announced that Terrastruct, the company, is shutting down and D2 will continue as a fully open-source non-profit under Hack Club fiscal sponsorship. The open-core model funded open-source D2 with a closed-source IDE (D2 Studio) and a proprietary layout algorithm (TALA), and both are now being released rather than sold. The founder says his time will be limited and is offering paid maintainer contracts funded by donations, which is the concrete failure mode of open-core in dev tools: the proprietary half never carried the free half.
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