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Use the sensors in your mobile devices to perform science experiments. Science doesn’t just happen in the classroom or lab—tools like Science Journal let you see how the world works with just your phone.
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Science Journal Logo

Twitter: @GScienceJournal License

Science Journal for iOS allows you to gather data from the world around you. It uses sensors to measure your environment, like light and sound, so you can graph your data, record your experiments, and organize your questions and ideas. It's the lab notebook you always have with you.

iOS screenshot showing experiments list.iOS screenshot showing `Iodine Clock` experiment.iOS screenshot showing `Iodine Clock` recording showing brightness sensor with various values.iOS screenshot showing `Iodine Clock` recording with notes alongside brightness sensor with various values.


  • Visualize and graph data from a variety of sources including your device's built-in sensor 📱
  • Connect to external sensors over BLE ↭🔌
  • Annotate observations with pictures 🏔 and notes 📝


Science Journal is brought to you by Making & Science, an initiative by Google.

Open Science Journal is not an official Google product.

Required dependencies

First, you'll need a Mac. We don't support building the iOS app on anything else.

Second, you'll need the latest version of Xcode installed.

Third, we use a few open source frameworks to build this app, so you'll need to install CocoaPods as your package manager in order to get what you need to build.

Fourth, we use protobuf. You'll need to install that too. We use Homebrew to install it: brew install protobuf@3.1; brew link protobuf@3.1 -f.

We recommend installing CocoaPods by running: sudo gem install cocoapods from your terminal.

Building and running

Before you jump into coding, you'll need to run

pod install from the root of this project (the folder that contains has the Podfile file)

Then you can open ScienceJournal.xcworkspace

Note: there is a ScienceJournal.xcodeproj file, but since we use CocoaPods, you shouldn't use that project file. If you do, nothing will work 😭

Contribute to Science Journal iOS

Check out for more information on how to help with Science Journal iOS.

Code of Conduct

Help us keep Science Journal open and inclusive. Please read and follow our Code of Conduct.


This project is licensed under the terms of the Apache 2.0 license. See the LICENSE file.

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