One cycle in, it's a pretty good app. Not without flaws. – Powerlifter - 531 Weightlifting Log Review

The app does a good job with the primary lifts; however, the logic behind the assistance programs (especially the app's version of the classic Big and Boring/Big and Dumb assistance) is goofy. A common decision people make with the Big and Boring routine is doing bench accessory work on OHP day and squat accessory work on deadlift day and vice versa. And even though the app warns the user against doing deadlift accessory work on deadlift day, when it comes time to actually do the work, it doesn't give you any other option. If it's deadlift day and you pick squat assistance, it gives you deadlift assistance. If you choose bench assistance, it gives you deadlift assistance. No matter which assistance work you select, it gives you the assistance work assigned for the primary lift you have just completed. Consequently, if you're planning on alternating the main lift and dynamic effort assistance work, the app fails you on a pretty big chunk of your workout. And while you can change the routines themselves, you will end up having to do calculate the math all on your own, which is supposed to be one of the reasons you buy the app. This would be a nice thing to revise on future updates of the app. It's also worth considering doing the Boring but Big challenge, in which the assistance work increases from 50 to 60 to 70 percent of the working max over the course of three cycles.
Review by LocalRocks on Powerlifter - 531 Weightlifting Log.