BLOCC

BLOCC is a physical NFC tag that puts a real barrier between you and your distracting apps. Tap the tag to lock them, tap again to unlock — you can't get around it from Settings, which is exactly the point. It comes with daily app limits, a tower-building game with 50 achievements, and automatic micro-donations every 15 minutes you stay in focus mode. One-time purchase at €39.99, lifetime access, works on up to 3 iPhones.