Comparison

Exatest Arithmetic Speed Drill vs Not Evil Sudoku

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

Head to head
About

Exatest Arithmetic Speed Drill

Enhance your mental math skills with a daily speed drill. Solve as many arithmetic problems as possible within a 120-second timer. Track your progress with a score chart and challenge friends in a daily global competition.

Highlights
  • Timed mental arithmetic challenges
  • Daily speed drill mode
  • Score tracking and progression chart
  • Global daily challenge competition
  • Friend challenges
  • Practice for interviews
Features
Read full description

Have you ever wanted to improve your mental arithmetic speed? Attempting this speed drill daily will surely help you achieve your goal! This app gives you 120 seconds to complete as many mental math problems as possible. When the timer is up your score will be saved to a chart to track your progression Challenge your friends using Daily mode The Daily Challenge provides the exact same mental arithmetic questions globally across all Exatest players each day. This mode is available to play once per day and scores can be shared with a friend. Find out who can get the highest scores! Watch as you improve day to day! This app is also useful for an upcoming trading interview. Being able to solve mental arithmetic questions on the spot can be practiced and speed can be trained.

About

Not Evil Sudoku

Enjoy a distraction-free Sudoku experience with helpful features like hints and real-time validation. Track your progress, compete globally, and customize the app with themes. Play daily puzzles for free or upgrade for unlimited games and advanced statistics.

Highlights
  • Fully offline play
  • No ads or distractions
  • Real-time move validation
  • Shake for hints
  • Daily puzzles with leaderboards
  • Customizable themes and icons
  • Notes and auto-clear notes
Features
Read full description

A joyful sudoku-solving experience built natively for iPhone and iPad and optimized for a zen solving experience free from bloat and distraction. Designed to be easy to play and meet you where ever you are in your sudoku journey: a casual solver or a sudoku pro. Stuck on a puzzle? Shake your phone for hints and turn on move by move validation in settings to get immediate feedback on your solve. Tickle your brain as you learn new solving strategies and customize the app to your taste with themes and alternate app icons. Play a daily puzzle at a difficulty of your choice and see where you stack up with players across the globe. Or just turn off the stopwatch and relax. Key features: - Fully offline: no internet required - No ads or distractions - Real-time move validation to get immediate feedback - Shake for a hint on the next logical move - Leaderboards with assist tracking - Easy, Medium, and Hard difficulty levels - Light/Dark mode - Stopwatch and best time tracking - Notes: Keep track of candidates - Auto-clear Notes: removes candidate numbers automatically in row, column, and box when they become outdated - Speed demon: Lock numbers and place them in multiple tiles at once - Arithmophobia: Sudoku with letters instead of numbers - Daily streak tracking - Daily reminder notifications - Highlighter: tap a number to highlight all its instances on the board - Themes to customize the interface (some require Pro) - Alternate app icons (Pro) - Charts and statistics (Pro): track solve speed over time and puzzle count by difficulty Play the daily puzzle at your preferred difficulty for free without any limits on assists or game features. Upgrade to Pro with a one-time purchase to unlock unlimited games, detailed stats, more themes, and alternate app icons. Pro supports Family Sharing.

Screenshots

Exatest Arithmetic Speed Drill3 screens
Not Evil Sudoku4 screens

Verdict

The call

The clearest difference is in-app purchases: Exatest Arithmetic Speed Drill at none against Not Evil Sudoku's 1. Exatest Arithmetic Speed Drill also leads on rating (4.9 vs 4.6). Not Evil Sudoku's advantage is ratings volume (1.1K vs 7) and review sentiment (75% vs 50%). 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. Not Evil Sudoku sells 1 one-off in-app purchase. Exatest Arithmetic Speed Drill asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Exatest Arithmetic Speed Drill holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: Not Evil Sudoku has 1.1K ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 50% of Exatest Arithmetic Speed Drill's written reviews are positive against 75% of Not Evil Sudoku's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Exatest Arithmetic Speed Drill ships an update every 5 weeks, Not Evil Sudoku every 9 days. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

Scorecard6 real differences · 4 level
Exatest Arithmetic Speed Drill versus Not Evil Sudoku: the parameters behind the verdict, then further details
ParameterExatest Arithmetic Speed DrillNot Evil Sudoku
PriceFreeFree
Rating4.9 (7 ratings) — better4.6 (1.1K ratings)
Positive reviews50.0% of reviews74.7% of reviews — better
Number of ratings71.1K — better
Update frequencyEvery 5 weeksEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.1 — better15
Further details — not scored
Size39 MB23 MB
Age rating12+4+
DeveloperSteven KideckelAshish Selvaraj

Customer experience

Exatest Arithmetic Speed Drill

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Not Evil Sudoku

All ratings983 ratings
Positive88.6%
Neutral3.1%
Negative8.3%
Written reviews241 reviews
Positive74.7%
Neutral5.8%
Negative19.5%

Bugs and requests

Exatest Arithmetic Speed Drill

Not enough reviews yet to summarise bugs or requests.

Not Evil Sudoku

Reported bugs

2 issues
  • Disappearing numbers when closing the app
  • Numbers swapping to incorrect spots

Requested features

6 requests
  • Add auto-clear notes option without move validation
  • Provide more theme color options
  • Implement a 'warm' mode similar to other sudoku apps
  • Add ability to remove notes after number is placed
  • Highlight all instances of a number in the puzzle
Show 1 more
  • Remove a number as a choice when it has been placed successfully

In-app purchases

None

Exatest Arithmetic Speed Drill

No in-app purchases

1 purchases

Not Evil Sudoku

One-time1
  • Pro$4.99

Questions

Is Exatest Arithmetic Speed Drill free?
Exatest Arithmetic Speed Drill is free to download, with no in-app purchases.
Is Not Evil Sudoku free?
Not Evil Sudoku is free to download, with in-app purchases available.
Which has better reviews, Exatest Arithmetic Speed Drill or Not Evil Sudoku?
Exatest Arithmetic Speed Drill is rated higher. Exatest Arithmetic Speed Drill averages 4.9 out of 5 from 7 ratings, while Not Evil Sudoku averages 4.6 from 1.1K ratings.
Do Exatest Arithmetic Speed Drill or Not Evil Sudoku have ads?
Neither Exatest Arithmetic Speed Drill nor Not Evil Sudoku shows ads.
Which is updated more often, Exatest Arithmetic Speed Drill or Not Evil Sudoku?
Exatest Arithmetic Speed Drill ships an update every 5 weeks, and Not Evil Sudoku every 9 days. Most recently, Exatest Arithmetic Speed Drill was updated on November 3, 2026 and Not Evil Sudoku on November 7, 2026.

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