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GitLab Pages vs Swagger UI: What are the differences?
Developers describe GitLab Pages as "Create websites for your GitLab projects, groups, or user account". Host your static websites on GitLab.com for free, or on your own GitLab Enterprise Edition instance. Use any static website generator: Jekyll, Middleman, Hexo, Hugo, Pelican, and more. On the other hand, Swagger UI is detailed as "dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation". Swagger UI is a dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation and sandbox from a Swagger-compliant API.
GitLab Pages and Swagger UI are primarily classified as "Static Web Hosting" and "Documentation as a Service &" tools respectively.
Rainist, Zalando, and Hootsuite are some of the popular companies that use Swagger UI, whereas GitLab Pages is used by Caravelo, Mocco, and Sigfox. Swagger UI has a broader approval, being mentioned in 205 company stacks & 107 developers stacks; compared to GitLab Pages, which is listed in 15 company stacks and 22 developer stacks.
From a StackShare Community member: "I just started working for a start-up and we are in desperate need of better documentation for our API. Currently our API docs is in a README.md file. We are evaluating Postman and Swagger UI. Since there are many options and I was wondering what other StackSharers would recommend?"
I use Postman because of the ease of team-management, using workspaces and teams, runner, collections, environment variables, test-scripts (post execution), variable management (pre and post execution), folders (inside collections, for better management of APIs), newman, easy-ci-integration (and probably a few more things that I am not able to recall right now).
I use Swagger UI because it's an easy tool for end-consumers to visualize and test our APIs. It focuses on that ! And it's directly embedded and delivered with the APIs. Postman's built-in tools aren't bad, but their main focus isn't the documentation and also, they are hosted outside the project.

I recommend Postman because it's easy to use with history option. Also, it has very great features like runner, collections, test scripts runners, defining environment variables and simple exporting and importing data.
Pros of GitLab Pages
- Integrated build and release pipeline4
- Free4
- Allows any custom build scripts and plugins2
Pros of Swagger UI
- Open Source47
- Can execute api calls from the documentation34
- Free to use29
- Customizable19
- Easy to implement in .Net14
- Mature, clean spec13
- API Visualization12
- Coverage9
- Scaffolding6
- Easy to use6
- Vibrant and active community5
- Elegant4
- Adopted by tm forum api3
- Clear for React2
- Api1
- Can deploy API to AWS API Gateway and AWS Lambda1
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Cons of GitLab Pages
- Require Jekyll approach1
- Slow builds0
Cons of Swagger UI
- Need to learn YAML and RAML3
- Documentation doesn't look that good2
- Doesn't generate code snippets in different languages1
- You don’t actually get in-line error highlighting1
- Does not support hypermedia1