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What is chat.cool?

fiberjw/chat.cool — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2017-04-17

★ 7JavaAudience · developerComplexity · 3/5DormantSetup · moderate

In one sentence

A real-time Android messaging app, like WhatsApp, built on a GraphQL-powered cloud backend called Graph.cool.

Mindmap

mindmap
  root((chat.cool))
    Inputs
      User messages
      GraphQL queries
    Outputs
      Real-time chat
      Stored conversations
    Use Cases
      Learn mobile plus GraphQL
      Build a messaging feature
      Connect app to cloud backend
    Tech Stack
      Java
      Android
      GraphQL
      Graph.cool

Code map

Detail Auto

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filefunction / class

What do people build with it?

USE CASE 1

Use this as a starting foundation for building a real-time messaging feature in an Android app.

USE CASE 2

Learn how to connect a mobile app to a modern backend using GraphQL.

USE CASE 3

Study how GraphQL queries let a mobile app fetch only the data it needs for faster performance.

USE CASE 4

Explore how a chat app stores conversations and user accounts using a hosted backend service.

What is it built with?

JavaAndroidGraphQLGraph.cool

How does it compare?

fiberjw/chat.coolkdn251/uva-1zhisheng17/es-learning
Stars777
LanguageJavaJavaJava
Last pushed2017-04-172016-12-242017-12-23
MaintenanceDormantDormantDormant
Setup difficultymoderateeasyeasy
Complexity3/51/51/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 1h+

README is brief and doesn't document setup steps, requires digging into the code or a Graph.cool backend.

License is not stated in the available content.

So what is it?

Chat.cool is a messaging app built for Android phones. It lets people send messages back and forth in real time, much like WhatsApp or Facebook Messenger. The app is built on a modern backend called Graph.cool, which is a cloud service that handles storing conversations, user accounts, and delivering messages. The app communicates with that backend using GraphQL, a way for mobile apps to ask for exactly the data they need, no more, no less. This approach keeps the app fast and responsive because it's not wasting time downloading information it doesn't use. The project is straightforward: it's an Android app that connects to a hosted backend service. If you're building a messaging feature and want a quick foundation, or if you're learning how to connect a mobile app to a modern backend, this repository shows one way to do it. The description emphasizes keeping things simple and current, using newer technologies rather than older approaches. The README itself is quite brief and doesn't detail all the features or explain how to set it up, so if you were actually interested in using or contributing to this project, you'd need to dig into the code or ask the author for more information.

Copy-paste prompts

Prompt 1
Explain how this Android app uses GraphQL to talk to its Graph.cool backend.
Prompt 2
Walk me through how messages flow from one user to another in this app's architecture.
Prompt 3
Help me adapt this project's GraphQL setup to add a new feature, like read receipts.
Prompt 4
Show me how this app's real-time messaging differs from a typical REST-based chat app.
Prompt 5
Use this repo's structure as a reference, help me plan a similar Android chat app with a different backend.

Frequently asked questions

What is chat.cool?

A real-time Android messaging app, like WhatsApp, built on a GraphQL-powered cloud backend called Graph.cool.

What language is chat.cool written in?

Mainly Java. The stack also includes Java, Android, GraphQL.

Is chat.cool actively maintained?

Dormant — no commits in 2+ years (last push 2017-04-17).

What license does chat.cool use?

License is not stated in the available content.

How hard is chat.cool to set up?

Setup difficulty is rated moderate, with roughly 1h+ to a first successful run.

Who is chat.cool for?

Mainly developer.

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