Custom API Graph Database Popularity Ranking

GUN leads with a score of 54.5, followed by Atomic Server (50.6) and Gaffer (49.0) — 13 engines ranked, May 2026.

#	Name	Score	Tier	Type	License	Language	Query Languages
1	GUN	54.5	Strong	Property Graph	MIT	JavaScript	Custom API
2	Atomic Server	50.6	Strong	Other	MIT	Rust	Custom API
3	Gaffer	49.0	Growing	Other	Apache-2.0	Java	Custom API
4	ZipG	40.6	Growing	Other	-	Java	Custom API
5	Weaver	35.8	Growing	Other	BSD-3-Clause	C++	Custom API
6	agdb	34.4	Growing	Property Graph	Apache-2.0	Rust	Custom API
7	CogDB	26.8	Emerging	Other	MIT	Python	Custom API
8	OmniGraph	26.4	Emerging	Property Graph	MIT	Rust	Custom API
9	Akutan	25.5	Emerging	RDF	Apache-2.0	Go	Custom API
10	RushDB	24.4	Emerging	Property Graph	ELv2	TypeScript	Custom API
11	KGLite	21.4	Emerging	Property Graph	MIT	Rust	Custom APIopenCypher
12	TribleSpace	16.5	Emerging	Other	MIT OR Apache-2.0	Rust	Custom API
13	LiveGraph	15.2	Emerging	Other	Apache-2.0	C++	Custom API