head to head · open source
hydra vs voidauth
hydra has 17,563 GitHub stars, 1,610 forks, 98 open issues and last shipped 2 months ago. voidauth has 2,843 stars, 124 forks, 60 open issues and last shipped 3 days ago. hydra leads on adoption by 518% (17,563 vs 2,843 stars). hydra is written in Go under Apache-2.0; voidauth is written in TypeScript under AGPL-3.0. hydra has attracted 9% as many forks as stars, voidauth 4%. voidauth was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (docker), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| hydra | voidauth | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 2.8K |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Go | TypeScript |
| Last push | 2026-07-29 | 2026-09-22 |
| Forks | ⑂ 1.6K | ⑂ 124 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick hydra if
- You weight community size — 18K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick voidauth if
- You want the voidauth feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and voidauth fits your workflow better
About hydra
Ory Hydra is an OpenID Certified OpenID Connect and OAuth 2.1 provider written in Go and licensed under Apache 2.0, built for teams that need standards compliant token issuance, client management, and consent flows while user accounts stay in their own existing identity system.
read the full hydra overview →
About voidauth
VoidAuth is an open source, self hosted single sign on and user management provider, written in TypeScript under the AGPL 3.0 licence, that places one authentication service in front of the self hosted applications of homelab operators, self hosters and small teams.
read the full voidauth overview →
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Frequently asked questions
Is hydra or voidauth more popular?
hydra has 17,563 GitHub stars and voidauth has 2,843. hydra has the larger community by that measure.
Are hydra and voidauth free?
Both are open source. hydra is licensed under Apache-2.0 and voidauth under AGPL-3.0. Neither carries a licence fee.
What is the difference between hydra and voidauth?
hydra is written in Go and voidauth in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, hydra or voidauth?
Choose hydra if you want the larger community (17,563 stars) or its Apache-2.0 licence terms. Choose voidauth if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.