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Emerge Tools Profile picture
@emergetools
Mar 12 • 3 tweets • 2 min read • Read on X
The more apps we look at, the more common this problem seems

Many apps are putting file paths for images & icons, which VoiceOver will pronounce as "slash" or "underscore"

Here's an example we found in the @AlaskaAir app (sound on) + more examples 👇
Here's the annotated Preview for the video above + a handful of other Previews w/ the same issue

We used our accessibility screenshots and an AI to surface problems. For Alaska, there are 20+ Previews that use file paths in VOPreview with 'spotsaver_logo' & 'modal_close_button' as VO
Preview with 'alert_schedulechange_icon' as VO
Preview with 'auro/interface/chevron-right' as VO
🧵 w/ more detail on how this works

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More from @emergetools

Emerge Tools Profile picture
Mar 25
These are the best 🥲... breaking down why @LinkedIn iOS is half a GB

Here's a top level view of the latest version of LinkedIn

300 MB for just dynamically linked frameworks & Plugins is...a lot. In fact, just the Dylibs & Plugins today are bigger than the entire app was back in November 2022 🫠
Emerge X-Ray of LinkedIn App showing 187.5 MB of Dylibs, 109.9 MB of Plugins, and a 110.6 MB main app binary
Size tracker of LinkedIn iOS app showing the app was 292.9 MB in November 2022 and is now ~450 MB
And the Plugins and Frameworks seems to be where the greatest inefficiencies lie. Here is a more detailed look at the LinkedIn Plugins + the dynamically linked VoyagerLibs.framework

Notice anything fishy?
Treemap of VoyagerLibs.framework. Many of the nodes are in a dark red, indicating duplicate resources
Treemap of two LinkedIn app extensions. Many of the nodes are in a dark red, indicating duplicate resources
Read 10 tweets
Emerge Tools Profile picture
Mar 8
Finding accessibility issues in an app is an incredibly manual task that can take hours depending on the size. Which seems like a perfect place for ✨AI ✨

🧵Surfacing accessibility issues in the @Drizly app w/ AI 🧠
A quick background - our Snapshots product turns Previews into snapshots. A recent feature gives the ability to use AccessibilitySnapshot w/ one line

You don't need to write test code to get snapshot tests or to snapshot VoiceOver elements
Code snippet showing `emergeAccessibility(true)` on a PreviewProvider
Drizly Preview with annotations of VO elements
We can take snapshots for any app leaking Previews into production, which @Drizly (and many other apps) are. We were able to generate 86 snapshots for Drizly

We then fed these images into an AI we're working on to detect accessibility errors. Here's what we found
Read 9 tweets
Emerge Tools Profile picture
May 23, 2023
Last week we wrote how @peacock reduced app size & app launch after moving from RN to native

By beautiful chance, another streaming app did the same this week. Did the same effects occur? Well, yes, no & it depends

🧵 Breaking down HBO's new Max app
So, HBO Max is now Max. New app, new bundle id, new logo, & entirely new codebase. Let's start by comparing the iOS size and architecture

iOS
HBO Max (old app): v53.20.1 - 60.4 MB install size
Max (new app): v1.0.1 - 108.8 MB

The new iOS app is 48.4 MB (~80%) bigger
Here's our X-Ray for the old HBO Max app. It consists of

~18 MB of images (top left)
~11 MB main.jsbundle (top right)
~15 MB main binary (bottom left)

The rest are misc frameworks, plugins, bundles, fonts, etc. Treemap of the HBO Max iOS ...
Read 22 tweets
Emerge Tools Profile picture
May 22, 2023
How did the @Twitter iOS app change over the last 6 months? Why did the latest release of Google Translate Android reduce app size by 1/3rd?

We try to make these questions easier to answer, which is why we're very excited about our newest feature, AI summaries of build diffs
Jumping right in - Twitter v9.59.1 vs. v9.34.6 (iOS)

Overall size decreased by 34 MB, but how quickly can we identify what changed? Image
The summary is pointing to removals of plugins and bundles, which is easy to see in the X-Ray diff

T1Twitter.framework is also highlighted in the summary. Searching through the diff, we can see that many assets were modified or removed to reduce its size ImageImage
Read 7 tweets
Emerge Tools Profile picture
May 18, 2023
So, what does the @OpenAI ChatGPT iOS app look like under the hood? Well we took a look at a decrypted build

🧵 How the ChatGPT iOS app is made
Overall install size is 41.9 MB and has a fairly simple structure. Here's our X-Ray treemap Treemap of ChatGPT iOS app....
The main thing that stands out is they're shipping 18 MB worth of debug symbols in the app. Nothing stood out when we sifted through

It's best practice to strip these out and is particularly easy to do since they only need to strip from their main app binary A highlight of 18MB of bina...
Read 8 tweets
Emerge Tools Profile picture
May 17, 2023
What happens to an app's performance when it goes from react native -> native?

The @peacock app just made the switch on iOS & Android and had a significant change in size and startup time

🧵 Performance impact of switching to native
A quick primer

RN let's you create mobile apps for Android and iOS using js & react. 1 codebase, 2 apps. It has an active community & there are certainly reasons you'd want to use RN

That said, if performance is important, native is going to be better
A few reasons

- JS is an interpreted language vs. native (Swift & Kotlin) is compiled
- RN is *mostly* singled threaded. Concurrency is complex and not as performant
- Native has easier access to device & OS features. RN requires more libraries to achieve functionality
Read 12 tweets

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