Cosmo vs PostX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cosmo
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We've been there. You need to execute a postman collection asap, but you're away from your desktop. You try the mobile web browser, but it's just not cutting it! Meet Cosmo, Postman's best friend. Cosmo integrates with your Postman account, giving you access to your Postman content on the go. Features include: ** Integration via API key. The key is store securely on your own device, and never leaves. ** Access all of your collections, across all workspaces. ** Modify collection and environment variables locally. ** Configure full or partial collection runs with support for nested folders. ** Or, trigger individual endpoint requests. ** View responses, complete with pass / fail test results. ** Pre and post request scripts will run seamlessly, and update local variable state. There are some tricks Cosmo hasn't learned yet: ** Create, edit, or delete collections and/or requests. ** Save variable modifications to the Postman servers. Only the local instances are updated. ** Team management. No inviting new members, managing members, etc. If you would like to see a new feature, just ask!
PostX
This app allows developers to build and test REST, HTTP, and SOAP APIs directly on their iPhone or iPad. It supports various request methods, authentication types, and body formats, with features for organizing requests and inspecting responses.
- HTTP/HTTPS methods (GET, POST, PUT, DELETE, PATCH)
- Custom query parameters
- Basic, Bearer/JWT, OAuth authentication
- Customizable headers
- Multiple body formats (raw, binary, GraphQL, form-data)
- Pre-request and post-response scripting
- Response viewer with status codes and prettified JSON
- Request history and workspaces
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PostX is a powerful yet simple API client for iPhone and iPad for working with REST APIs, HTTP APIs, and even occasional SOAP APIs. Use this REST API client and HTTP API client to quickly build requests, inspect responses, and iterate on your backend without needing a desktop tool. Features of PostX • HTTP/HTTPS methods Send requests with GET, POST, PUT, DELETE, PATCH, and more so you can cover most modern REST and HTTP APIs in one API client. • Custom parameters Add query parameters with key, value, and descriptions to keep complex endpoints organized and reusable in your API-client testing workflow. • Authorization Use Basic, Bearer/JWT, and OAuth-style authentication to connect securely to protected APIs directly from this REST API client for iOS. • Headers Add custom headers, with common ones like Content-Type and User-Agent ready for quick setup when using this HTTP API client on iPhone and iPad. • Body formats Build request bodies in raw, binary, GraphQL, form-data, and x-www-form-urlencoded formats to handle most real-world REST and HTTP API scenarios. • Scripts Insert pre-request and post-response scripts to handle tokens, variables, and simple checks without leaving your API client. • Response viewer View status codes, headers, and prettified JSON to understand and debug API behavior faster during API-client testing. • History Automatically save requests and responses so you can rerun, tweak, and reuse them whenever you need inside your API client for iOS. • Workspaces Create workspaces to organize APIs by project, service, or environment so you can keep related requests grouped and easy to access. Its a great alternative to Postman PostX is an all-in-one REST API client and HTTP API client for iPhone and iPad that brings your desktop API workflow to iOS. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://elevarelab.site/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: Cosmo at none against PostX's 3. Cosmo also leads on iOS requirement (15.1 vs 17.6). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. PostX sells 3 in-app purchases, starting at $4.99 per 7 days. Cosmo asks for nothing beyond the download.
| Parameter | Cosmo | PostX |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (10 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 10 — better |
| Update frequency | — | Every 3 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.6 |
| Further details — not scored | ||
| Size | 45 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Fetch Cosmo, LLC | Anupkumar Naginbhai Patel |
In-app purchases
Cosmo
No in-app purchases
PostX
- Postmon Pro Weekly$4.997 Days
- Postmon Pro Monthly$9.991 Month
- Postmon Pro Yearly$24.991 Year





