back to home

2018-02-10

How I Reduced the Size of My React Native App by 86%

I borrowed 25$ from my friend to start a Play Store Developer account to put up my first app. I had already created the app, created the assets and published it in the store. Nobody wants to download a todo list app that costs 25mb of bandwidth and another 25 MB of storage space.

So today I am going to share with you how I reduced the size of Tet from 25 MB to around 3.5 MB.

Size Matters

Like any beginner, I wrote my app using Expo, the awesome React Native platform that makes creating native apps a breeze. There is no native setup, you write javascript and Expo builds the binaries for you.

I love everything about Expo except the size of the binaries. Each binary weighs around 25 MB regardless of your app.

So the first thing I did was to migrate my existing Expo app to React Native.

Migrating to React Native

This reduces the size to around 7.5 MB, thin but we can go thinner.

Reducing size of React Native App (Android)

This is what you have been waiting for, I know.

Setting the last function creates two distinct apk in the build folder. You have to upload both of this apk to Play Store and Google would take care of distributing the app to the correct architectures.

Using this split generates version numbers for both apks in the order of 104856 and such. This is auto-generated by the build to avoid version conflicts, so don’t freak out (I did).

This split reduced the apk size from around 7MB to 3.5MB for arm and 5MB for x86 respectively.

Conclusion

So that’s how you lose weight. Reducing the size of your app has many added benefits, the best being more users will be willing to download your app.

Be sure to check out https://www.producthunt.com/posts/tet if you feel like seeing slim stuff.