Comparison

Nuj Alarm Clock vs rotblock

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

Head to head
About

Nuj Alarm Clock

This alarm clock uses financial penalties to motivate users to get out of bed. Set alarms, challenges like scanning barcodes, and a penalty amount. If you fail to complete the challenge by the set time, the penalty is charged, often donated to charity. It features cloud-based cheat detection to prevent bypassing the alarm.

Highlights
  • Financial motivation for waking up
  • Barcode scanning challenges
  • Cloud-based cheat detection
  • Customizable penalties
  • Charitable donation options
  • Prevents turning off the alarm
Read full description

Nuj is the FIRST alarm clock that uses money to motivate you to get out of bed! Featured in FastCompany: "There’s nothing quite like a little financially motivated fear to get you moving in the morning" — from "These 5 alarm apps are sure to wake you up" Featured on local NBC and CBS TV stations: "...might be just what you need to finally break the snooze button habit" — from "What the Tech: App of the Day" → How it works: 1. Set an alarm time, and a get up time 2. Add a challenge to prove you got up, e.g. a barcode you have to scan 3. Set a penalty 4. If you don't prove you got up by completing the challenge, e.g. scanning one of the barcodes, by the get up time, you get charged the penalty For example: 1. Set an alarm for 7:00am with a get up time of 7:05am 2. Add the toothpaste and shampoo barcodes 3. Add a $10 penalty 4. Alarm goes off at 7:00am 5. Get up and scan the toothpaste barcode before 7:05am. Or, don't, and lose $10 (goes to charity) → Have you ever turned your phone off to avoid getting up from a different alarm clock app? Nuj is the ONLY alarm clock that includes cheat detection by storing alarms in the cloud! No more cheap tricks! ↓ Wondering if it really works? Just read some of our reviews from ecstatic users! ↓

About

rotblock

Features
Read full description

Doomscrolling is easy. rotblock makes it cost a thought. Pick the apps and websites that steal your time. When you try to open one, rotblock steps in: solve a short learning challenge and the app unlocks for the minutes you chose. Then it locks again. You still get your apps, you just earn them, and you learn something every time. HOW IT WORKS • Choose apps and sites with Apple's Screen Time picker • Set a rule per app: which challenge, how many questions, how many minutes • Open a locked app, solve, get your time • Emergency unlock when you really need it (with a short wait) CHALLENGES THAT TEACH • Math that adapts to your level • Flashcards: answer by typing, by voice or by handwriting • Reading comprehension with short passages • Chess puzzles and a learning path • Languages: Spanish, French, German, Italian, Portuguese, Arabic and Chinese, including writing Arabic letters and Chinese characters by hand • Coding: concepts plus Python, JavaScript/TypeScript, C, C++, Go, Rust and ARM64 • Physics and history A BRAIN THAT GROWS WITH YOU Every solved challenge feeds your pixel-art brain. It evolves from a tiny mush into a gym brain and keeps going, with crowns, auras and looks from the Brain Shop and free gift packs. RULES THAT STICK • Daily open limits per app • Timer mode: wait it out instead of solving • Study hours and a nightly wind-down schedule • Priming: a short breathing, gratitude and intention routine before you scroll • Block adult websites with Apple's content filter • A guide to turning on grayscale TRACK YOUR PROGRESS Take the Quick check or the Full test and watch your estimated IQ, speed, memory and reasoning change over time. The IQ score is an estimate for tracking your own progress. It is not a clinical or diagnostic IQ assessment. FRIENDS (PRO) Add friends with a code or QR, compare streaks, duel on challenges and trade brain cosmetics. AI TUTOR Pick any topic and get a course researched and taught step by step, with readings, flashcards and practice. One-time €29 add-on, requires Pro. WIDGETS Your brain, your streak, your level and your locked apps on the Home Screen. Tap to practice. PRIVATE BY DESIGN • The apps you lock stay on your device. rotblock only gets anonymous tokens from Screen Time and never learns which apps they are. • No ads, no tracking, no third-party analytics. • Handwriting is read on your device. Voice answers use on-device speech recognition where your iPhone supports it. • An account is optional (Sign in with Apple) and only needed for the leaderboard, friends and cloud backup. ROTBLOCK PRO Free: app and website blocking, math, flashcards (one custom deck plus the starter decks) and reading, and your first IQ test. Pro unlocks every challenge type, unlimited decks, schedules, priming and IQ retests. Try Pro free for 7 days, then €99 per year or €9.90 per month (prices may vary by country). Payment is charged to your Apple Account when the trial ends. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel any time in your Apple Account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://rotblock.org/privacy Requires Screen Time access. Made in Austria by WMB GmbH.

Screenshots

Nuj Alarm Clock4 screens
rotblock4 screens

Verdict

The call

The clearest difference is in-app purchases: Nuj Alarm Clock at none against rotblock's 10. Nuj Alarm Clock also leads on device support (3 vs 1) and iOS requirement (15.6 vs 26.0). rotblock's advantage is update cadence (weekly vs every 2 months). On price and ads 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. rotblock sells 10 one-off in-app purchases. Nuj Alarm Clock asks for nothing beyond the download.

UpkeepUpdate frequency

Nuj Alarm Clock ships an update every 2 months, rotblock weekly. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.

Scorecard4 real differences · 6 level
Nuj Alarm Clock versus rotblock: the parameters behind the verdict, then further details
ParameterNuj Alarm Clockrotblock
PriceFreeFree
Rating4.7 (88 ratings) — better—
Positive reviews93.6% of reviews—
Number of ratings88 — better—
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreemium—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better26.0
Further details — not scored
Size71 MB37 MB
Age rating17+4+
DeveloperSnowble Inc.WMB GmbH

Bugs and requests

Nuj Alarm Clock

Reported bugs

5 issues
  • Scanner fails to open despite app being active
  • App freezes during barcode scanning process
  • Alarm setup is confusing and unintuitive
  • Shortcut configuration issues on some devices
  • Deactivation process problematic when deleting app

Requested features

6 requests
  • Puzzle or math problems to ensure mental alertness
  • More charity options for penalty donations
  • Yearly subscription discount pricing
  • Additional physical activity verification methods
  • Customizable alarm sounds beyond shortcuts
Show 1 more
  • Batch alarm creation for recurring schedules

rotblock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Nuj Alarm Clock

No in-app purchases

10 purchases

rotblock

One-time10
  • Heart$0.99
  • Lightning$0.99
  • Lab coat$1.99
Show 7 more
  • Owl$2.99
  • Dragon$2.99
  • Dog$2.99
  • Axolotl$2.99
  • Robot$2.99
  • Starter pack$3.99
  • All pets$8.99

Questions

Is Nuj Alarm Clock free?
Nuj Alarm Clock is free to download, with no in-app purchases.
Is rotblock free?
rotblock is free to download, with in-app purchases available.
Do Nuj Alarm Clock or rotblock have ads?
Neither Nuj Alarm Clock nor rotblock shows ads.
Which is updated more often, Nuj Alarm Clock or rotblock?
Nuj Alarm Clock ships an update every 2 months, and rotblock weekly. Most recently, Nuj Alarm Clock was updated on November 11, 2026 and rotblock on November 6, 2026.

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