Garnet vs KeyDB
Both are alternatives to Redis. Here's how they stack up — verified facts, no spin.
Also searched as KeyDB vs Garnet — same comparison, one verdict.
Garnet and KeyDB are closely matched on ownership (92 vs 89) — this one comes down to pricing and to which trade-offs below you can live with.
Garnet
Microsoft Research's cache — MIT, and unusually fast under contention.
Garnet is a Redis-protocol cache store out of Microsoft Research, written in C#, and its published throughput under high client concurrency is striking — the workload where Redis's single-threaded design shows most. MIT licensed, around 12k stars, used inside Microsoft before release. It is the most permissively licensed serious option here. The caution is ecosystem: a .NET server is an unusual dependency for teams that are not already there, and it is the newest of these by some distance.
KeyDB
The earlier fork — multithreaded Redis, BSD, now Snap-owned.
KeyDB forked Redis before any of this to add multithreading, and was acquired by Snap in 2022. It remains BSD-3-Clause with around 12.5k stars and full Redis protocol compatibility, including active replication where multiple nodes accept writes. It is the option with the longest track record of the forks here. The honest caveat is momentum: development has slowed considerably since the acquisition, and Valkey has absorbed most of the community energy that KeyDB once held.
Side by side
6 points of comparison, every one read from a verified field. Green marks the side that wins a row outright. A dash means we do not hold that fact — never that it is zero.
| Garnet | KeyDB | |
|---|---|---|
| Sovereignty ScoreOur transparent 0–100 composite for data ownership and exit cost. | 92 | 89 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first data | Yes | Yes |
| License | MIT | BSD-3-Clause |
| Pricing | Free and open source. | Free and open source. |
Garnet edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Weighing both against staying on Redis? Is Redis free? What it actually costs →
Garnet
Strengths
- +MIT — the most permissive licence in this comparison
- +Exceptional throughput under high concurrency
- +Microsoft Research behind it, with real production use
- +Redis protocol compatible, so clients work unchanged
Trade-offs
- −Newest option here with the shortest track record
- −A .NET runtime dependency many teams will not want
- −Smaller community than Valkey or DragonflyDB
- −Not all Redis commands and data types are implemented
KeyDB
Strengths
- +BSD-3-Clause with a longer production history than Valkey
- +Multithreaded well before Redis addressed it
- +Active-active replication — multiple writable nodes
- +Full Redis protocol compatibility
Trade-offs
- −Development pace has slowed markedly since Snap acquired it
- −Community energy has largely moved to Valkey
- −Corporate owner rather than foundation governance
- −Fewer managed hosting options
Which one fits you
The trade-offs above, turned into a decision. Find the line that describes your team.
Choose Garnet
if a lower exit cost matters more to you than any single feature, and mIT — the most permissive licence in this comparison.
Choose KeyDB
if bSD-3-Clause with a longer production history than Valkey.
Neither, yet
if both carry a real cost you should weigh first — newest option here with the shortest track record, and development pace has slowed markedly since Snap acquired it. If either of those is a dealbreaker for your team, the shortlist is wrong rather than the choice.
Garnet vs KeyDB — common questions
Is Garnet a better fit than KeyDB for in-memory data stores & caching?
It depends on what you are optimising for, and the honest split is this: Garnet scores 92 to KeyDB's 89 on data ownership and exit cost, so it is the safer choice if you care about being able to leave. KeyDB earns its place on a different axis — bSD-3-Clause with a longer production history than Valkey. Neither is a wrong answer for every team; the table above is the actual comparison.
What happens if we want to switch later?
Garnet keeps its data local or in open formats, so leaving is an export rather than a negotiation. KeyDB is still self-hostable, so the files stay on your server either way — but it is not local-first by design, so check what its export produces before you rely on it.
Can I self-host Garnet or KeyDB?
Both can be self-hosted. The difference is what it costs you in time rather than whether it is possible — see the setup and maintenance rows above.
Are Garnet and KeyDB both alternatives to Redis?
Yes — both appear in our Redis comparison, which is why they are worth putting side by side. People usually arrive here already having decided to move off Redis and now choosing between the two replacements, which is a narrower and much easier question.
Related alternative guides
Facts verified 2026-08-05. Licenses and pricing change — spotted something out of date? That's a correction we want.