Side by side
Flems vs Pennant
Both stand on coding playgrounds. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Paid Self-hostedWeb
Flems focuses on quick front-end experimentation, browser execution, and link-based sharing. Its static runtime and linked-file limits make it less suited to full-stack development or unrestricted file editing.
Visit Flems Paid Web
Pennant brings collaborative editing and shared execution to a browser notebook with offline caching. Its lack of runtime and deployment features makes it a notebook project rather than a complete application hosting stack.
Visit PennantThe facts
| Flems | Pennant | |
|---|---|---|
| Free plan | Not published | Not published |
| Open source | Not published | Not published |
| Runs on | Self-hosted, Web | Web |
| Lowest paid plan | Not published | Free or on request |
| Plans published | None | 1 |
| Maker | Not published | Not published |
| Website | flems.io | trypennant.com |
| On coding playgrounds | #137 of 138 | #133 of 138 |
Flems: what it does well
- Free and open source
- Runs code in an iframe browser runtime
- Supports TypeScript, LiveScript, and Babel
- Shares playgrounds through URL state
- Can be self-hosted or embedded
What to know first
- It is a static, not full-stack, runtime
- Fullscreen functionality is disabled
- Long linked files may remain external links
- Dependencies are fetched from unpkg.com
Pennant: what it does well
- Real-time collaborative editing and outputs
- Runs cells or complete notebooks
- JavaScript and Python support
- Caching and offline capabilities
- MIT-licensed open source
What to know first
- No full-stack runtime
- No deployment options
- Go and Ruby are only upcoming
Alternatives to Flems Alternatives to Pennant The whole list