is it really FOSS?

Convex

A reactive database for app developers

Nope!
Not FOSS but there are FOSS related licensing, marketing, or transparency issues.

Details

The project is provided under a Functional Source License (FSL), with change to Apache 2.0 after two years. The FSL license is non-FOSS, preventing any kind competitive use, modification or distribution.

The project advertises as open source on its website, including a dedicated open source page. It also advertises as open source in its GitHub description and project readme.

This was queried on Reddit, but the references remain 4 months later at time of review.

The project appears to have raised at least $26m in funding from investors which include Andreessen Horowitz. The project appears to receive revenue from selling its software as a service.

Details last reviewed 2025-06-11. Mistakes or outdated information? Let us know by opening an issue on Codeberg.