Apps like Brick split into two groups that are easy to confuse: other devices you physically tap to unlock your apps, and software blockers that do similar things without the object.
Scrolly and Bloom work on the same principle Brick does. You choose the apps you want blocked, tap your phone against the device to switch blocking on, and tap it again to switch it off. The device has to be physically present to unblock, which is the whole mechanism.
Where they differ is price, what the companion app does around the block - schedules, statistics, streaks, motivation features - whether a laptop and tablet are covered or only the phone, how long the refund window runs, and whether the thing is built to clip to your keys or to sit on a counter.
Opal, Freedom, Screenzen and the screen time limit built into iOS are what most people try before buying a device. They are cheaper, often free, and several do more than any of the devices on scheduling and reporting. The trade-off is that the thing standing between you and the app is something you control on the same phone, which is exactly the loophole that sends people looking for a physical option in the first place.
Start with where your problem actually is. If you have never tried blocking at all, a free software blocker will tell you cheaply whether blocking helps you. If you have already overridden one, the question is not which app has more features but which object you will realistically leave out of reach.
If the distraction is also on a laptop, check platform coverage before anything else - blocking social apps on a phone while the same sites stay open in a browser moves the habit rather than ending it.
Two video reviews on this site compare Brick and Scrolly directly, one of them with a section on where Scrolly falls short. Scrolly has also published its own written feature-by-feature comparison, which is worth reading as the maker's case rather than an independent test.