Sure — Did I Turn It Off? is a free productivity app developed by Konstantin Kovalev. It is a simple but helpful app that is designed to help you eliminate the anxiety of wondering whether you’ve turned something off or completed an important task by letting you prove it with a photo.

Snap, complete, relax

Sure is an app designed to help users break the anxious “did I forget?” cycle by letting them create photo-based checklists that prove key things are done before they leave home or go to bed. Instead of endlessly replaying tasks in your mind, you simply snap a photo—whether it’s the stove turned off, doors locked, or lights switched off.

You then mark it as complete in the app's Focus Moment, giving you visual proof and peace of mind. It’s built with privacy in mind: all photos and data stay on your device with offline support, and optional Face ID or PIN protection. However, its narrow feature set focuses almost entirely on photo-based checklists, with no advanced task management or reminder tools.

Effective within its niche

Sure — Did I Turn It Off? delivers a focused, calming solution for everyday anxiety by using photo-based proof instead of traditional reminders. Its simple design, offline use, and strong privacy protections make it effective for reassurance, though its limited feature set keeps it firmly within a single, specialized use case.