Comparison

Cala vs Crux

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

Head to head
About

Cala

Read full description

You pick up your phone for "just a second" โ€” and 45 minutes disappear. Cala stops that cycle with real app blocking and a ten-second breath that turns impulse into intention. When you open a blocked app, Cala holds a shield. You breathe, then choose how long you need โ€” 5, 15, or 30 minutes. When time's up, the app locks itself again. You decided in advance, so the moment doesn't get a vote. WHAT CALA DOES โ€ข Blocks any app or website with Apple's Screen Time shields โ€” real blocking, not reminders โ€ข No Shortcuts to wire up and no workarounds to maintain โ€” grant Screen Time access once and you're protected โ€ข Protects on your schedule: work hours, evenings, overnight, or all day โ€ข A short breathing exercise before every unlock โ€” a pause, not a punishment โ€ข Timed access that re-locks automatically when you're done โ€ข Three strictness levels โ€” Standard, Strict, and Locked. As firm as you need. โ€ข Habits and tasks live inside your protected hours, so the shield offers a better option, not just a wall โ€ข A Focus Score that measures the time you protected and the wins you stacked โ€” not your failures โ€ข A weekly review of your wins, ready every Monday AS FIRM AS YOU NEED Standard asks for a calm ten-second breath before each unlock. Strict makes each unlock cost a little more. Locked holds the line completely โ€” with a once-a-day emergency pass, because life happens. PRIVATE BY DESIGN Cala never sees which apps you open or for how long. Apple's Screen Time design keeps that on your device, and we like it that way. FREE TO START One schedule, unlimited blocked apps, two habits, your Focus Score, and the full breathing unlock โ€” free. Cala Pro adds unlimited schedules and habits, Strict and Locked levels, and your complete history. Your phone, your rules. Cala keeps them. Terms of Use: https://heycala.com/terms

About

Crux

Features
Read full description

Crux blocks the apps that steal your time โ€” so you can actually focus. Set a session, pick the apps to block, and put your phone down. Crux uses Apple's Screen Time technology to enforce the block system-wide, even if you close the app. FOCUS SESSIONS Block any app for as long as you need. Crux holds the block until the session ends โ€” no cheating. SCHEDULED SESSIONS Set recurring blocks in advance. Your protection runs automatically, even if you never open the app. NIGHT MODE Block apps during your sleep window. Wake up to how many times you reached for your phone, how long you were on it, and which apps kept you up. INSIGHTS See where your day actually went โ€” hour by hour, and which apps took it. Crux marks the hours it protected for you, and tells you how today compares with your usual pace. HOME SCREEN WIDGET See what's coming without opening the app โ€” your next session, tonight's sleep window, and a live countdown while a block is running. STREAKS & STATS See your focus streak and total time saved grow over time. YOUR DATA STAYS ON YOUR PHONE Crux reads your Screen Time data inside Apple's sandbox, and it never leaves your device. We never see which apps you use, or which ones you block. No gimmicks. No fake willpower tricks. Just a hard block on the apps that shouldn't have your attention. Privacy Policy: https://idanrach.github.io/crux-legal/privacy.html Terms of Use: https://idanrach.github.io/crux-legal/terms.html EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Cala4 screens
Crux4 screens

Verdict

The call

The clearest difference is update cadence: Crux at every 2 weeks against Cala's every 4 months. Crux also leads on iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Cala sells 2 in-app purchases, starting at $7.99 per month and Crux sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Cala ships an update every 4 months, Crux every 2 weeks. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.

Scorecard2 real differences ยท 4 level
Cala versus Crux: the parameters behind the verdict, then further details
ParameterCalaCrux
PriceFreeFree
Update frequencyEvery 4 monthsEvery 2 weeks โ€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS18.016.0 โ€” better
Further details โ€” not scored
Size31 MB16 MB
Age rating4+4+
DeveloperSpark Digital IncorporatedIdan Rachmani

In-app purchases

2 purchases

Cala

Subscriptions2
  • Cala Pro โ€” Monthly7 Days trial$7.991 Month
  • Cala Pro โ€” Yearly7 Days trial$59.991 Year
3 purchases

Crux

Subscriptions3
  • Crux Pro Weekly$2.997 Days
  • Crux Pro Monthly3 Days trial$4.991 Month
  • Crux Pro Yearly3 Days trial$29.991 Year

Questions

Is Cala free?
Cala is free to download, with in-app purchases available.
Is Crux free?
Crux is free to download, with in-app purchases available.
Do Cala or Crux have ads?
Neither Cala nor Crux shows ads.
Which is updated more often, Cala or Crux?
Cala ships an update every 4 months, and Crux every 2 weeks. Most recently, Cala was updated on September 10, 2026 and Crux on September 11, 2026.

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