Source: https://seerepo.com/compare/ben-manes/caffeine/vs/openzipkin/zipkin
Markdown source: https://seerepo.com/compare/ben-manes/caffeine/vs/openzipkin/zipkin.md
Description: caffeine and zipkin share 4 technologies: caffeine, jcl-over-slf4j, jul-to-slf4j, and log4j-core. Both are written in Java.

# caffeine vs zipkin

caffeine and zipkin share 4 technologies: caffeine, jcl-over-slf4j, jul-to-slf4j, and log4j-core. Both are written in Java.

- [ben-manes/caffeine](https://seerepo.com/r/ben-manes/caffeine): A high performance caching library for Java
- [openzipkin/zipkin](https://seerepo.com/r/openzipkin/zipkin): Zipkin is a distributed tracing system

## What they share and what sets them apart

- In common: caffeine, jcl-over-slf4j, jul-to-slf4j, log4j-core
- Only in caffeine: H2 Database, javax.cache:cache-api, com.hazelcast:hazelcast, org.ehcache:ehcache, org.apache.felix.framework, jakarta.inject:jakarta.inject-api, org.jfree:jfreechart, jsoup, de.siegmar:fastcsv, slf4j-nop
- Only in zipkin: kafka-clients, MariaDB, org.apache.cassandra:java-driver-core, spring-boot-starter-cache, Apache, MySQL, org.apache.pulsar:pulsar-client, RabbitMQ, com.zaxxer:HikariCP, Spring, org.springframework.cloud:spring-cloud-starter-netflix-eureka-server, Vite, React, react-router-dom, history, org.jooq:jooq, log4j-1.2-api, micrometer-bom, micrometer-registry-prometheus, micrometer-registry-prometheus-simpleclient, org.apache.logging.log4j:log4j-jul, org.springframework.boot:spring-boot-starter-actuator, slf4j-simple, spring-boot-starter-log4j2, zipkin-reporter-brave, org.slf4j:slf4j-api, io.micrometer:micrometer-core, styled-components, classnames, @material-ui/styles, material-ui, react-virtualized-auto-sizer, react-window, recharts, @material-ui/icons, Font Awesome, prop-types

## Side by side

| | caffeine | zipkin |
|---|---|---|
| Size | 190,783 lines written, 469 code files | 73,675 lines written, 326 code files |
| Who writes it | 0.1% of its commits signed by AI. With GitHub Copilot and Claude Code | 0% of its commits signed by AI |
| Activity | Last push October 25, 2026, 2,922 commits, 17,934 stars | Last push August 6, 2026, 2,780 commits, 17,473 stars |
| Tests | 255 test files. 29.4% of its code files have a test that imports them | 231 test files. 54.9% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, caffeine or zipkin?

caffeine, with 190,783 lines written; zipkin has 73,675.

The proof: [ben-manes/caffeine's code at commit 10646b0](https://github.com/ben-manes/caffeine/tree/10646b00c14a7837fe16a16a2a7b1f82e5fa3155)

### Which has more GitHub stars, caffeine or zipkin?

caffeine, with 17,934 stars; zipkin has 17,473.

The proof: [ben-manes/caffeine on GitHub](https://github.com/ben-manes/caffeine)

### Which has more tests, caffeine or zipkin?

caffeine, with 255 test files; zipkin has 231.

The proof: [ben-manes/caffeine's code at commit 10646b0](https://github.com/ben-manes/caffeine/tree/10646b00c14a7837fe16a16a2a7b1f82e5fa3155)

### Which was updated more recently, caffeine or zipkin?

caffeine: its last push was on October 25, 2026, and zipkin's on August 6, 2026.

The proof: [ben-manes/caffeine's commits on GitHub](https://github.com/ben-manes/caffeine/commits)

### Which has more commits signed by AI, caffeine or zipkin?

caffeine: an AI signed 0.1% of its commits, with GitHub Copilot and Claude Code.

## Sources

- ben-manes/caffeine: Read on November 6, 2026, at commit 10646b0 (https://github.com/ben-manes/caffeine/tree/10646b00c14a7837fe16a16a2a7b1f82e5fa3155)
- openzipkin/zipkin: Read on November 6, 2026, at commit 878ce2a (https://github.com/openzipkin/zipkin/tree/878ce2a1fad54ca941d17fdcf2e1d924b148eb1f)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.