one sec is one of the more philosophically honest tools in this category: it doesn't claim to be a hard blocker, and it says so plainly in its own marketing. Built by an independent developer through a small, non-VC-backed company, it inserts a short intervention — most often a guided breathing exercise, sometimes a typed phrase or a small math problem — at the exact moment you open a flagged app, then gets out of your way. Of everything researched for this page, it's the closest in spirit to what Mr. Grummel is trying to do, which makes the differences between the two genuinely worth spelling out rather than glossing over. That closeness in philosophy is exactly why the differences that remain are worth taking seriously rather than treating as marketing noise on either side.
What one sec actually does
The moment you tap a flagged app, one sec intercepts the launch and shows an intervention screen before the app opens — a breathing exercise is the default, with other options including a short typed-phrase task or a simple math problem, and even a mirror-style reflection screen. It offers this across iOS, Android and desktop browsers via extension, which is a broader platform reach than many pure mobile blockers manage. Crucially, one sec is explicit that the intervention has a skip button: you can tap through it and open the app anyway, no questions asked. It markets itself on published research about the effect of that pause, citing figures like a claimed screen-time reduction from its own studies, rather than marketing itself as unbeatable. one sec's desktop browser extension in particular fills a gap most mobile-first blockers in this comparison set don't cover at all, letting the same basic pause apply to a distracting website on your laptop as well as an app on your phone.
Where one sec is honestly the better pick
one sec offers several distinct intervention types — breathing, a typed phrase, a math problem, even a mirror/reflection screen — where Mr. Grummel offers exactly one: a quiz question. If what actually works for you is a calming pause rather than a mental task, or you want to vary the type of friction you hit so it doesn't become background noise, one sec's range is a genuine, fair advantage. It's also been doing this specific thing, and studying it, for longer than most competitors, which gives its published behavior-change claims more weight than a newer entrant's would carry. one sec has also been refined through direct user research for longer than most competitors here, and it publishes its methodology rather than just asserting a number, which is a genuinely higher bar for evidence than most apps in this category clear.
| Feature | one sec | Mr. Grummel |
|---|---|---|
| Platforms | iOS, Android, Mac, Windows, Linux (via browser extension) | iOS & Android (in development) |
| Core mechanism | A short pause — breathing exercise, typed phrase, or math problem — before a flagged app opens | Answer a quiz question from the app's curriculum to unlock |
| Can you skip the friction? | Yes, an explicit skip/continue button is part of the design | No — the app stays blocked until you answer |
| Physical hardware required? | No | No |
| Price | Free for one app; paid plan for unlimited apps from roughly $3.99/mo | Not yet announced — join the waiting list |
The one mechanical difference that actually matters
Both apps are built on the same core theory: friction, not a lock, is usually enough. Where they diverge is whether the friction can be skipped. one sec's intervention is opt-out — a genuine, deliberate design choice, since forcing a breathing exercise on someone defeats its own calming purpose, and the whole point of a mindfulness pause is that you choose to engage with it. Mr. Grummel's quiz question is opt-in only in the sense that you have to actually engage with it to get through; there's no continue button that bypasses the answer, and a wrong answer simply means trying again rather than being let through anyway. That makes Mr. Grummel's friction slightly harder to walk through on autopilot, at the cost of losing the flexibility one sec offers to anyone who genuinely just needs thirty seconds of calm.
Who should pick which
If you want a genuinely gentle pause — something to interrupt the reflex without demanding real effort — and you're comfortable that you could skip it if you chose to, one sec's breathing-first approach is doing exactly what it says, and its range of intervention types means it won't feel stale after a few weeks of use. If you specifically want the pause to require something from you before it lets go, with no built-in exit and no way to tap through on autopilot, that's the gap between one sec's optional friction and Mr. Grummel's mandatory one. Either way, it's worth trying both approaches for a week before settling on one, since the actual difference between a skippable pause and a mandatory question tends to become obvious quickly in practice, in a way that's hard to predict from a feature list alone.