Comparison

NoStim vs Arc Lock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NoStim

This app helps you regain control of your screen time by blocking addictive app features while preserving essential functions like direct messages. It offers customizable blocking, a unique portal to websites with distractions removed, and flexible modes for different needs.

Highlights
  • App feature blocking
  • Website portal with distractions removed
  • Customizable blocking budgets
  • Ratchet mechanism for stricter settings
  • Comfort, Driving, and Vacation modes
  • Optional social accountability circles
  • Partner lock feature
Features
Read full description

NoStim blocks the parts of your apps that pull you back, and keeps the parts that are about people. Scroll free. Open Instagram, YouTube, X, Facebook, Reddit, LinkedIn, Pinterest or Twitch inside NoStim with the addictive parts taken out: no Reels, no endless feed, no Shorts. You choose what's hidden on each one. Log in once and stay logged in. Posts your friends send you still open. Chats. Read and answer your Instagram and Reddit messages without going near the feed. Post. Go straight to writing a post on X, Reddit or YouTube, with no feed on the way. Real blocking. Apple's own Screen Time shields on the apps you pick, with limits that mean something: opens per day, minutes per open, opening odds if you want the dice to decide, locked hours, and a waiting room that offers you something else to do instead of a lecture. Modes and schedules. Lock things down for studying, the gym or winding down at night, by hand or on a schedule that starts and ends by itself. Driving Mode. It starts when your iPhone's Driving Focus turns on and frees the apps you need in the car, like Maps, Messages and music. No lock ever holds it back. A ratchet, not a cage. Making NoStim stricter is instant. Making it looser waits out a delay you chose ahead of time. Lock your settings for a weekend, a week, or with no end date at all, and if you want out early, the price is one you set when you were thinking clearly. Kind where it counts. Comfort Mode for chronic illness bad days, with no guilt and no questions. Vacation mode you book a day ahead. Streaks that measure commitment, not abstinence: using your whole budget still counts as a day held. Together. An optional circle of a few people who care, sharing only your streak and your stumbles, person to person through your own iCloud. A partner lock where someone you trust holds the key. YouTube inside NoStim keeps playing when you leave the app or lock your phone, and it can play in picture in picture. The blocker is free, forever. No ads and no account. NoStim Pro adds Circles, partner unlock codes, your full history and extra themes. Nothing that blocks is ever behind the paywall. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sashalawrence13.github.io/NoStim/privacy.html

About

Arc Lock

Features
Read full description

Companies fight for every second of your time to keep you distracted. Taking control of your screen time should be a human right, not something locked behind a paywall. Arc Lock blocks the apps and websites that eat your day, and once a block starts, it stays on. Every feature is free for everyone: no subscription, no account, no ads, no in-app purchases. SCHEDULES Pick apps, app categories and websites, choose the hours and days, and they lock on their own. Overnight windows like 11 PM – 7 AM work too (up to 22 hours). DAILY LIMITS Allow yourself a set time each day, from 5 minutes to 8 hours. See exactly how many minutes are used and left. When the time is used up, those apps lock until the limit resets: at midnight, or at the time you pick (say 4:00 AM, for late nights). A heads-up comes 5 minutes before. TIME-OUTS Not a full block, a pause. After a stretch of use, the apps take a short break, then open again. For example: after 20 minutes of short videos, a 10-minute break. It repeats all day and starts fresh at its reset time. BLOCK NOW Lock distractions right away, from 15 minutes to 12 hours. The Block now button is always one tap away. PLACES Pick one or more places on the map, like the library, your school or the gym, and the apps lock when you arrive. Each place block ends when you leave, or after a set time, whichever you choose, and starts only on the days you pick. Location access is asked for only when you set up a place block, and Arc Lock never sends your location anywhere. STRICT LOCK Every block can have Strict lock, and it's on by default. While a strict block runs: • it can't be stopped, loosened or deleted in Arc Lock • the date and time can't be changed by hand • the block screen has a single button: Close Daily limits and time-outs are locked in until they reset: you can make one stricter once a day, but looser settings only start at its next reset. Want a gentler block? Switch Strict lock off for that block, and you can stop it whenever you like. Switching Strict lock off for the whole app works right away: a block that's running or counting stays strict only until its own reset, or until it ends. DELETION PROTECTION On by default: no app can be deleted from your iPhone, Arc Lock included. Switching it off waits only until your strict blocks reset or end. LOCK-IN Freeze every rule for 1 to 30 days, even between blocks: no loosening, no deleting rules, no deleting apps. Changes you queued before it wait until it ends. WEBSITES BY ADDRESS Type a site like youtube.com and it's blocked in Safari and every other browser, in schedules, daily limits, time-outs and Block now. APPLE'S OWN LOOK Native lists and a compact Liquid Glass tab bar: Home, Blocks and Settings. Names are optional: a block without one is shown by its first app. Five themes (Navy, Graphite, Forest, Plum and Paper), each with a matching app icon. The phone-and-lock mark in the app closes while something is blocked. PRIVATE BY DESIGN Arc Lock works through Apple's Screen Time. Apple keeps your activity on your iPhone; Arc Lock never learns which apps you use and sends nothing anywhere. No account, no analytics, no tracking. OPEN SOURCE The complete source code is on GitHub under the MIT license: github.com/WeldingArc/arc-lock

Screenshots

NoStim4 screens
Arc Lock4 screens

Verdict

The call

The clearest difference is in-app purchases: Arc Lock at none against NoStim's 8. NoStim's advantage is update cadence (every 3 days vs every 8 days). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. NoStim sells 8 in-app purchases, starting at $2.99 per month. Arc Lock asks for nothing beyond the download.

UpkeepUpdate frequency

NoStim ships an update every 3 days, Arc Lock every 8 days. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
NoStim versus Arc Lock: the parameters behind the verdict, then further details
ParameterNoStimArc Lock
PriceFreeFree
Rating5.0 (5 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings5 — better—
Update frequencyEvery 3 days — betterEvery 8 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.0 — better18.0
Further details — not scored
Size11 MB7 MB
Age rating4+4+
DeveloperWilliam LawrenceJUN HYUK CHOI

In-app purchases

8 purchases

NoStim

Subscriptions2
  • NoStim Pro (Monthly)$2.991 Month
  • NoStim Pro (Yearly)$19.991 Year
One-time6
  • Tip the developer$0.99
  • Tip the developer$4.99
  • Tip the developer$9.99
Show 3 more
  • Tip the developer$14.99
  • Tip the developer$19.99
  • NoStim Pro — Forever$39.99
None

Arc Lock

No in-app purchases

Questions

Is NoStim free?
NoStim is free to download, with in-app purchases available.
Is Arc Lock free?
Arc Lock is free to download, with no in-app purchases.
Do NoStim or Arc Lock have ads?
Neither NoStim nor Arc Lock shows ads.
Which is updated more often, NoStim or Arc Lock?
NoStim ships an update every 3 days, and Arc Lock every 8 days. Most recently, NoStim was updated on November 8, 2026 and Arc Lock on October 31, 2026.

Other comparisons