head to head · open source
Apache SkyWalking vs semantic_logger
Apache SkyWalking has 24,988 GitHub stars, 6,632 forks, 41 open issues and last shipped 2 days ago. semantic_logger has 957 stars, 140 forks, 0 open issues and last shipped 2 days ago. Apache SkyWalking leads on adoption by 2,511% (24,988 vs 957 stars). Apache SkyWalking is written in Java under Apache-2.0; semantic_logger is written in Ruby under Apache-2.0. Apache SkyWalking has attracted 27% as many forks as stars, semantic_logger 15%. Apache SkyWalking was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (logging), 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
| Apache SkyWalking | semantic_logger | |
|---|---|---|
| GitHub stars | ★ 25K | ★ 957 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Ruby |
| Last push | 2026-11-03 | 2026-11-03 |
| Forks | ⑂ 6.6K | ⑂ 140 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Apache SkyWalking if
- You weight community size — 25K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick semantic_logger if
- You want the semantic_logger feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Ruby
- You evaluated both and semantic_logger fits your workflow better
About Apache SkyWalking
Apache SkyWalking ========== SkyWalking : an APM (Application Performance Monitoring) system, especially designed for microservices, cloud native and container based architectures. Abstract SkyWalking is an open source APM system that provides monitoring, tracing and diagnosing capabilities for distributed systems in Cloud Native architectures. Distributed Tracing End to end distributed tracing. Service topology analysis, service centric observability and APIs dashboards. Agents for your stack Java, .Net Core, PHP, NodeJS, Golang, LUA, Rust, C++, Client JavaScript and Python agents with active development and…
read the full Apache SkyWalking overview →
About semantic_logger
Semantic Logger Semantic Logger is a high performance, asynchronous structured logging framework for Ruby and Rails. It differs from ordinary loggers in two important ways: 1. It logs structured data, not just strings. Along with the text message, each log entry can carry a payload (any Hash), an exception, a duration, metrics, and tags. That data is preserved all the way to the destination, so it stays searchable instead of being flattened into text. 2. It logs asynchronously. Log events are pushed onto an in memory queue and written to their destinations by a separate background thread, so your application is…
read the full semantic_logger overview →
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Frequently asked questions
Is Apache SkyWalking or semantic_logger more popular?
Apache SkyWalking has 24,988 GitHub stars and semantic_logger has 957. Apache SkyWalking has the larger community by that measure.
Are Apache SkyWalking and semantic_logger free?
Both are open source. Apache SkyWalking is licensed under Apache-2.0 and semantic_logger under Apache-2.0. Neither carries a licence fee.
What is the difference between Apache SkyWalking and semantic_logger?
Apache SkyWalking is written in Java and semantic_logger in Ruby. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Apache SkyWalking or semantic_logger?
Choose Apache SkyWalking if you want the larger community (24,988 stars) or its Apache-2.0 licence terms. Choose semantic_logger if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.