head to head · open source
Prometheus vs lettuce
Prometheus has 66,109 GitHub stars, 10,839 forks, 890 open issues and last shipped yesterday. lettuce has 5,778 stars, 1,101 forks, 204 open issues and last shipped today. Prometheus leads on adoption by 1,044% (66,109 vs 5,778 stars). Prometheus is written in Go under Apache-2.0; lettuce is written in Java under MIT. Prometheus has attracted 16% as many forks as stars, lettuce 19%. lettuce was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Prometheus | lettuce | |
|---|---|---|
| GitHub stars | ★ 66K | ★ 5.8K |
| License | Apache-2.0 | MIT |
| Written in | Go | Java |
| Last push | 2026-09-17 | 2026-09-18 |
| Forks | ⑂ 11K | ⑂ 1.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prometheus if
- You weight community size — 66K 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 lettuce if
- You want the lettuce feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Java
- You evaluated both and lettuce fits your workflow better
About Prometheus
Prometheus is an open source monitoring system and time series database, part of the Cloud Native Computing Foundation ecosystem. It collects metrics from configured targets at defined intervals, evaluates alerting rules, and visualizes results. Designed for reliability in dynamic environments, it operates without reliance on distributed storage, ensuring each server node functions independently.
read the full Prometheus overview →
About lettuce
Lettuce is an MIT licensed, thread safe Java Redis client from the Redis organization that speaks to Redis over synchronous, asynchronous, and reactive APIs, and it is aimed at Java teams running Redis or Redis compatible caches such as AWS ElastiCache and Azure Redis Cache.
read the full lettuce overview →
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Frequently asked questions
Is Prometheus or lettuce more popular?
Prometheus has 66,109 GitHub stars and lettuce has 5,778. Prometheus has the larger community by that measure.
Are Prometheus and lettuce free?
Both are open source. Prometheus is licensed under Apache-2.0 and lettuce under MIT. Neither carries a licence fee.
What is the difference between Prometheus and lettuce?
Prometheus is written in Go and lettuce in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Prometheus or lettuce?
Choose Prometheus if you want the larger community (66,109 stars) or its Apache-2.0 licence terms. Choose lettuce if its feature set, stack or MIT licence fits better. Both are self-hostable.