| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | — |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 0 |
| Spec score · Web Server Software | 8.4 (#3) | 7.6 (#18) |
| Dependencies | Optional dependencies listed include zlib, OpenSSL, Mbed TLS and GNU TLS. | Building the standalone server requires a C/C++ compiler, CMake, pkg-config, OpenSSL 1.0.2 or later or a compatible TLS stack, and zlib. |
| License | The project says CivetWeb uses the MIT license. | The FAQ states that H2O is licensed under the MIT license. |
| Purpose | CivetWeb is an embeddable C/C++ web server with optional CGI, SSL and Lua support. | H2O is an optimized HTTP server supporting HTTP/1.x, HTTP/2, and HTTP/3. |
| Scripting | The project lists Lua server pages, server-side Lua scripts, Lua SQLite database support and server-side JavaScript. | H2O can be scripted using mruby with Rack-based support. |
| Support | The project directs users to its documentation and examples and invites bugs, questions and feature requests through GitHub issues. | The FAQ directs users with problems to GitHub issues tagged as FAQ. |