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
🧵 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 
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
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
ChatGPT isn't linking any dynamic frameworks, helping keep it's size small. We can see some modules they're linking statically
@mixpanel for analytics
@datadoghq for logging
@getsentry for performance monitoring
@RevenueCat for payments
@auth0 for authentication
+ others
@mixpanel for analytics
@datadoghq for logging
@getsentry for performance monitoring
@RevenueCat for payments
@auth0 for authentication
+ others
We also took a look at their startup using ETTrace 👀👀👀
Their overall startup time is very fast, really only initializing a few of their included frameworks with no obvious bottlenecks
You can use ETTrace as a local and open-source way to profile any iOS app, check it out here
github.com/emergeTools/et…
github.com/emergeTools/et…
Right now, it looks like the app just forwards the query / responses to and from OpenAI's servers. Nothing of note, but we'll definitely be monitoring any updates to the app and waiting for the Android version 🤖
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