Yes — several real, currently free blockers exist without a subscription, though the honest caveat is that free options are concentrated at the browser and desktop level rather than full-device mobile blocking, since app-level blocking on iOS and Android generally requires ongoing OS integration that free, unfunded projects tend not to maintain as reliably. LeechBlock NG (free, open-source Chrome/Firefox extension), SelfControl (free, open-source Mac app), and StayFocusd (free Chrome extension with a daily time budget) are the most consistently available options that don't gate core blocking behind a paywall. It's also worth noting "free" and "open-source" aren't quite the same thing here — LeechBlock and SelfControl are both open-source, meaning their code is publicly auditable, which is a meaningfully different trust proposition than a closed-source app that simply doesn't charge money.
How each of these actually blocks
LeechBlock NG works as a browser extension that intercepts navigation to specified domains during rules you configure — time-of-day windows, day-of-week rules, or a fixed daily time budget — and it's refreshingly explicit in its own documentation that a technically determined user can disable the extension entirely, since a browser extension has no elevated permission to stop itself being turned off. SelfControl works differently and more strongly: it blocks access at the Mac's own firewall level, adding the specified domains to a blocklist that persists even through a restart, for a duration you set at the start and that cannot be shortened or reversed until it expires — including by deleting the app itself. StayFocusd works similarly to LeechBlock, as a Chrome extension with a daily allowance per site, after which the sites become inaccessible until the following day, with an optional "nuclear option" that blocks everything except a whitelist. It's worth knowing SelfControl in particular is a long-standing, well-known open-source project rather than a commercial product with a hidden catch — its blocklist restriction genuinely cannot be lifted early through the app itself, including by quitting or deleting it, which is a stronger technical guarantee than most free mobile tools offer. StayFocusd's optional "nuclear option" is worth using carefully, since it blocks by default rather than allow-listing, which for some people is a more effective default than a permissive one that requires remembering to add sites as they come up.
Why free tools skew toward browser and desktop, not mobile
Full app-level blocking on iOS requires Apple's Screen Time / Family Controls framework, and on Android it requires Accessibility Service or Usage Access permissions — both of which need active maintenance as OS versions change, since Apple and Google periodically adjust these APIs. A browser extension, by contrast, works against a comparatively stable extension API that changes far less often, which is part of why free, community-maintained tools cluster there rather than in native mobile apps. This isn't a sign free mobile blockers don't exist at all — several do, often with a free tier that blocks a limited number of apps or lacks harder-lock features — but the fully free, subscription-free, actively maintained mobile blocker is rarer than the browser equivalent, and it's worth checking a given app's current pricing page rather than assuming a "free" label from an old review still holds. This is also why the free options that do exist tend to be either genuinely open-source community projects with no revenue model to sustain, or narrowly scoped single-platform tools rather than full cross-device suites — maintaining Screen Time or Accessibility Service integration through OS updates is ongoing work that an unfunded free tier struggles to keep pace with over years. This also explains why a genuinely good mobile blocker, free or paid, is harder to build and maintain well than it might look from the outside — it isn't just UI on top of a stable API, it's ongoing integration work against a platform that changes underneath it.
What the free tier trade-off usually looks like
Where mobile apps do offer free tiers, the trade-off is typically one or more of: a cap on the number of blocked apps, no cross-device sync, no scheduled or recurring blocks (only manual, one-off sessions), or the harder "strict mode" enforcement features reserved for paid tiers. This is a reasonable and common freemium structure, not a bait-and-switch — the core blocking mechanism usually still functions on the free tier, just with fewer configuration options around it. For someone testing whether blocking helps at all before committing to a subscription, the free tier of most mobile blockers is a genuinely useful trial, even if it isn't meant to be the permanent, full-featured setup. It's worth checking a specific app's current free-tier limits directly rather than relying on an older review, since freemium structures change fairly often as apps add features and adjust which ones sit behind a paywall. It's worth reading a specific app's app-store listing and, ideally, recent user reviews before assuming a described free tier still matches what's currently shipping, since app-store descriptions aren't always updated the moment pricing changes.
Where Mr. Grummel fits
Mr. Grummel isn't out yet, so there's no current pricing to compare — when it launches, the plan is to keep the core quiz-gated blocking usable without a subscription, with the waiting list the way to hear when that's confirmed. Anyone trying blocking for the first time on a tight budget has genuine, real free options today, particularly at the browser level — it's just worth going in with accurate expectations about what "free" typically does and doesn't include on mobile specifically. In the meantime, the browser and desktop tools above are genuinely free today, with no trial period or feature countdown attached to that word.
Sources
- LeechBlock NG, SelfControl and StayFocusd project documentation (open-source, publicly available)