If you are looking for an iPhone/iOS workout tracker app, try Physique.
Designed to be used at the gym.
Price: $4.99 or check this thread on reddit for some promo codes to get it for free or if you have questions for the developer.
People seem to like it. You can enter your own workouts or use presets for Starting Strength or StrongLifts.
The app can definitely be used to track Starting Strength and StrongLifts. They’re built into the app, but are a hidden feature for now. If you download it and want to check them out, tap the link below on your iPhone after installing it and they will show up in the Routine list.
Link to show SS / SL Routines:
Here is the intro video