Opal vs One Sec:
a rule that blocks, or a pause you can pass

Opal and One Sec approach the same goal from different directions. Opal is built around rules you configure in advance: schedules, time limits, and an optional Hard Mode that removes the ability to unblock. One Sec is built around a single moment of friction, a pause before the app opens, that you can act on or click through.

This page compares the two products directly. For how either one stacks up against Fella specifically, see Fella vs Opal or Fella vs One Sec, or read on for where Fella fits as a third option.

Both products are backed by real design thinking, just aimed at different failure points. Opal assumes the problem is unrestricted access and answers with rules. One Sec assumes the problem is an unexamined reflex and answers with a moment of friction. Neither claim is wrong; they're just solving different parts of the same habit.

Opal's rules exist before you ever try to open the app. A schedule, time limit, or open limit is set in advance, and Hard Mode, once enabled, removes the ability to unblock or leave early. The restriction is already decided by the time you reach for your phone.

One Sec's pause happens at the moment of the attempt. Nothing is pre-configured to stop the app from opening. Instead, a breathing screen interrupts the reflex and gives you a chance to reconsider, an intervention that happens live rather than a rule set in advance.

That difference shapes who each one actually helps. Opal suits someone who wants access already decided before temptation arrives. One Sec suits someone whose problem is closer to an unexamined reflex that a moment of friction can interrupt.

One Sec's 57% figure comes from a genuine peer-reviewed study. Research run with the Max Planck Institute and Heidelberg University, published in the Proceedings of the National Academy of Sciences, found the pause reduced social media app openings by roughly 57% on average, a credible, well-documented result.

That also means the app opens the other 43% of the time. The pause is designed to persuade, not to physically prevent. If you continue past it, One Sec doesn't have a rule stopping you the way Opal's Hard Mode does.

Opal's Hard Mode is a different kind of guarantee. Once active, it cannot be unblocked or left early, and its Waiting Room adds a countdown even before a permitted unblock completes, a harder restriction than a pause you can choose to click through.

Choose One Sec if you want the cheaper option with broader platform reach. Its pricing is lower at every tier, and it covers more operating systems, including Windows, which Opal doesn't reach at all.

Choose Opal if you specifically want a hard, rule-based restriction. Hard Mode's no-unblocks behavior and scheduled rules offer a stronger guarantee than a pause you can choose to continue past, if you're willing to pay for Pro to get there.

Consider how each one fails on a hard day. One Sec's pause can be clicked through by a determined moment. Opal's free tier without Hard Mode can be unblocked without much resistance either. The gap closes considerably once you're comparing Opal Pro against One Sec's stricter settings directly.

Opal and One Sec both ask you to make a choice: which rule to build, or whether to act on the pause. That's not a flaw, it's the point of both products. Opal rewards careful rule-building; One Sec rewards responding well to a moment of friction.

Fella removes both of those decisions. There's no rule to configure and no pause to act on. Selected iPhone apps stay blocked from the first open, with one 5-minute emergency unlock per session included in every plan, no Pro tier required to reach it.

The right pick depends on what kind of failure you're trying to prevent. If a well-designed rule or a moment of friction is usually enough for you, Opal or One Sec already does that job well. If you've noticed rules get loosened and pauses get clicked through, that's the gap Fella is built for. See how Fella works or current pricing.