head to head · open source
monolog vs Foundatio
monolog has 21,402 GitHub stars, 1,920 forks, 3 open issues and last shipped 4 days ago. Foundatio has 2,104 stars, 250 forks, 15 open issues and last shipped 7 days ago. monolog leads on adoption by 917% (21,402 vs 2,104 stars). monolog is written in PHP under MIT; Foundatio is written in C# under Apache-2.0. monolog has attracted 9% as many forks as stars, Foundatio 12%. monolog 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.
← all 20902 open source comparisons
Side by side
| monolog | Foundatio | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | PHP | C# |
| Last push | 2026-11-01 | 2026-10-29 |
| Forks | ⑂ 1.9K | ⑂ 250 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick monolog if
- You weight community size — 21K stars and counting
- You want the MIT license terms
- Your stack matches PHP
- You value the larger contributor base for long-term maintenance
pick Foundatio if
- You want the Foundatio feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches C#
- You evaluated both and Foundatio fits your workflow better
About monolog
Monolog Logging for PHP Note This is the documentation for Monolog 3.x , if you are using older releases see the documentation for Monolog 2.x or Monolog 1.x Monolog sends your logs to files, sockets, inboxes, databases and various web services. See the complete list of handlers below. Special handlers allow you to build advanced logging strategies. This library implements the PSR 3 interface that you can type hint against in your own libraries to keep a maximum of interoperability. You can also use it in your applications to make sure you can always use another compatible logger at a later time. As of 1.11.0…
read the full monolog overview →
About Foundatio
Pluggable foundation blocks for building loosely coupled distributed apps. ✨ Why Choose Foundatio? 🔌 Pluggable implementations Swap Redis, Azure, AWS, or in memory with no code changes 🧪 Developer friendly In memory implementations for fast local development and testing 💉 DI native Built for Microsoft.Extensions.DependencyInjection 🎯 Interface first Code against abstractions, not implementations ⚡ Production ready Battle tested in high scale applications 🔄 Consistent APIs Same patterns across caching, queues, storage, and more 🧱 Core Building Blocks 🚀 Quick Start 📦 Provider Implementations 📚 Learn More…
read the full Foundatio overview →
More in Infrastructure & Operations
Related comparisons
More Monitoring & Observability projects
Compare either of these against the rest of the Monitoring & Observability field.
Frequently asked questions
Is monolog or Foundatio more popular?
monolog has 21,402 GitHub stars and Foundatio has 2,104. monolog has the larger community by that measure.
Are monolog and Foundatio free?
Both are open source. monolog is licensed under MIT and Foundatio under Apache-2.0. Neither carries a licence fee.
What is the difference between monolog and Foundatio?
monolog is written in PHP and Foundatio in C#. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, monolog or Foundatio?
Choose monolog if you want the larger community (21,402 stars) or its MIT licence terms. Choose Foundatio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.