Best apps like Cosmo: mobile postman

10+ similar apps compared and reviewed

4.0 avg rating
10 free apps
Updated September 2026

Cosmo is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.

Top Alternatives to Cosmo

RestForge - API Client#1

RestForge - API Client by KHANG LE

GraphQL & REST API Client
Editor's Choice
πŸ› οΈ Developer Tools
1.3(4 ratings)
FreeAdsIn-App Purchases
RestForge - API Client screenshot 1
RestForge - API Client screenshot 2
RestForge - API Client screenshot 3

This app allows developers to build, test, debug, and automate APIs directly from their mobile devices. It supports various HTTP methods, body types, and offers cloud sync, scripting, and SOAP support. Premium features include code export and an analytics dashboard.

PostX - Rest API Client#2

PostX - Rest API Client by Anupkumar Naginbhai Patel

HTTP API Client
Strong Contender
πŸ› οΈ Developer Tools
3.0(10 ratings)
FreeIn-App Purchases
PostX - Rest API Client screenshot 1
PostX - Rest API Client screenshot 2
PostX - Rest API Client screenshot 3
PostX - Rest API Client screenshot 4
PostX - Rest API Client screenshot 5
PostX - Rest API Client screenshot 6

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.

Reins: for Ollama & LM Studio#3

Reins: for Ollama & LM Studio by Ibrahim Cetin

Private, Local AI Chat
Worth Considering
πŸ› οΈ Developer Tools
4.5😊(269 ratings)
FreeIn-App Purchases
#53in Developer Tools
Reins: for Ollama & LM Studio screenshot 1
Reins: for Ollama & LM Studio screenshot 2
Reins: for Ollama & LM Studio screenshot 3
Reins: for Ollama & LM Studio screenshot 4
Reins: for Ollama & LM Studio screenshot 5
Reins: for Ollama & LM Studio screenshot 6

This app provides a mobile interface for interacting with self-hosted large language models. It allows users to connect to their Ollama servers remotely, manage multiple chats, customize prompts, and adjust advanced model parameters for research and experimentation.

What We Love

  • πŸ‘ Simple and easy to use
  • πŸš€ Fast and efficient performance
  • ✨ Clean and intuitive interface
  • πŸ”’ Privacy and local-first approach
  • πŸ’» Great for local LLM interaction
  • πŸ“± Seamless mobile experience
  • 🌟 Well-implemented and functional
  • πŸ’‘ Supports image input
  • πŸ’― Highly recommended

Room to Improve

  • πŸ› Scrolling issues
  • πŸ“‰ Table display is scrunched on mobile
  • πŸ”Œ Connection doesn't maintain in background
  • 🚫 Lacks advanced parameters
  • 🌐 No web search integration
  • πŸ’» UI takes up too much space on tablets
  • πŸ€” Difficult to connect to non-local servers
  • πŸ”‹ Drains battery on long chats
  • 🚫 Can't connect to cloud LLMs
  • 🚫 Doesn't work with Ollama turbo
  • 🚫 Requires server setup

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