Emerge Tools Profile picture
Jun 24, 2024 8 tweets 3 min read Read on X
Another day, another "How is this app so big tweet" 🤓

This time its the @DJIGlobal iOS app, which comes in at 1 GB Screenshot of tweet of the DJI Mimo app store with the text "New app size recrod"
A lot of the comments speculated that the app was large due to assets & while there are 155 MB of .mp4 video files, the bulk of the size is coming from ML models Pie chart of app size showing 155 MB (15%) are coming from videos
There's 264 MB of .mlmodelc files - these are compile Core ML Models which are designed to run on Apple devices. Some of the biggest models 👇

face_feature.mlmodelc - 68.7 MB
inpainting_l2.mlmodelc - 50.8 MB
pet.mlmodelc - 30.5 MB Screenshot showing .mlmodelc files in a treemap
We also see a `` inside `LCTAISDK.bundle` at 83 MB

There's also 25 MB of models w/ a `.mnn` extension, not entirely sure what this is, but found this repo that might be related. Anyone more familiar?
localAiModel.zip
github.com/alibaba/MNN
Screenshot of `localAiModel.zip` node, which has an install size of 83 MB
So how do we get to 1 GB?

Lots of ML files
A ton of videos
~150 MB of dynamic frameworks
110 MB main app target binary

There's about 120 MB of easy savings from Emerge Insights that we're picking up
Screenshot of all dynamic frameworks in the app. Total instal size of dynamic frameworks are 142.4 MB
Screenshot showing three Emerge insights that could save close to 120 MB of size
Here's a brief overview on Core ML
emergetools.com/glossary/core-…
And finally, here's our example page if you want to dive in
emergetools.com/app/example/io…

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More from @emergetools

Jan 23
We got multiple tags to analyze the Tapo @TPLINK app for being over 760 MB 👀

Let's see what we find in here 🤭🔎 Image
Total install size is 764 MB

204.6 MB
171.5 MB frameworks
45.4 MB main app target
27.7 MB plugins
a whole bunch of assets and localizations assets.carImage
We actually found that the current app version increased by ~162 MB compared to its previous version 🤔 so what changed?

They added @Unity along with a bunch of other stuff, mostly assets Image
Read 11 tweets
Jan 21
It's always the banking apps huh 🤦‍♂️

Figuring out why the @UBS banking iOS app is almost 800 MB 🥲 Image
First up, an overview

Frameworks - 336 MB (43%)
Main app target - 180 MB (23%)
Plugins - 55 MB (7%)

But what really sticks out is all that red, which signifies duplicate files ❌ Image
There's a handful of really simple optimizations here which could reduce install size by 102 MB or by 13% of total install size 📉 Image
Read 15 tweets
Jan 16
Customer: “Why is this app so big?”

Company: “Very cool features & lots of them + you have no way to check what I’m saying”

Not today corporate. Not today.

🧵 Why @ouraring is ~450 MB Image
This might be a bit long, so TL;DR

Oura is just duplicating a bunch of images, json, & localizations. The size isn’t b/c it’s “powerful with many features”

Here’s what the size actually is 👇

Assets: 207.8 MB
Localizations: 49.2 MB
JSON: 35.5 MB
Audio: 26.5 MB Image
The Oura app is mostly different bundles:

OuraImages (90.4 MB): Images
OuraComputeModels (26.1 MB): PyTorch models
Insights (16 MB): JSON files to score “sleep”, “readiness”, etc.
OuraLocalizations (12 MB): Localizations
OuraIcons (9 MB): Icons Image
Read 9 tweets
Jan 7
In 2024, @DraftKings decreased app size by 65% and improved app launch by +50%

Let’s take a look at what they did

🔬 Migrating from Xamarin → Native Image
The main app binary went from 97 MB → 11 MB (the project also changed its name from DK.Gaming.iOS → Sportsbook)

Aside from that, much of the size decrease came from completely removing all dynamic-link libraries (.dll, used in Xamarin projects) Image
We measured a 65% improvement in the native build vs. the Xamarin build (Xamarin) to didFinishLaunching

When we look at the base flamechart, you can see a significant amount of the runtime is from Mono functions

Mono is the C#/.NET runtime used by Xamarin and it’s now completely goneImage
Read 6 tweets
Dec 17, 2024
We got tagged to analyze this app on Thre*ds so we're posting it here too 🤭

🧵 Let's take a look at why the @intesasanpaolo iOS app is 699 MB 😳 Image
A quick breakdown 👇

448 MB (64%) dynamic frameworks 🫠
72 MB (10%) main app target
74 MB (11%) of assets Image
We first found some low-hanging fruit improvements to optimize install size, including

102 MB (15%) from stripping binary symbols
27 MB (4%) from optimizing images
10 MB (1.5%) from removing duplicates

That's 139 MB (20%) of size that could be easily reduced right there 🧠 Image
Read 7 tweets
Nov 11, 2024
We've got to stop meeting like this 😅

🧵 taking a look under the hood of the @Yelp iOS app Image
Install size weighs in at ~318 MB, but ~4 MB of that is the watch app ⌚️

High-level breakdown:

130 MB dynamic frameworks
47 MB assets
34 MB main app target binary
26 MB localizations

For reference, @GoogleMaps weighs in at ~296 MB (7% smaller) Image
Emerge found 245 images that could be optimized to help save 21 MB (~7%)

We found two nearly identical images of this woman with her dog — one with a vignette and one without. Are both images used in the app? Only Yelp could answer that 🕵️ Image
Read 8 tweets

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