Comparison

The Letter Flash Machine vs Subtraction Mathematics

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

Head to head
About

The Letter Flash Machine

This app helps young children learn to recognize alphabet letters through interactive keyboard matching and picture-based letter identification. It tracks performance and uses sound effects to enhance the learning experience.

Highlights
  • Letter recognition games
  • Keyboard matching activity
  • Picture-based letter identification
  • Performance tracking
  • Pronouncing letters
  • Sound effects for engagement
Features
Read full description

The Letter Flash Machine helps young learners recognize the letters of the alphabet. A randomly selected letter appears on the screen and the student's task is to match the letter by pressing the corresponding letter on the keyboard. In addition, pictures are randomly selected and the task is to find the missing letter. The app keeps track of the child's performance by reporting the number of problems and percent correct for each of the activities. Sound effects are used to make learning fun. For example, during the game, each randomly selected letter is pronounced.

About

Subtraction Mathematics

This math app teaches children multi-digit subtraction with step-by-step guidance and positive reinforcement. It adapts to the student's learning pace, offering practice for beginners and review for older students. Features include AI handwriting recognition and progress monitoring for parents and teachers.

Highlights
  • Multi-digit subtraction with borrowing
  • Step-by-step instructions
  • AI handwriting recognition
  • Progress monitoring with color-coded feedback
  • Customizable digit combinations
  • Encouragement-based learning
Features
Read full description

SUBTRACTION is a smart math app that teaches children how to subtract multi-digit numbers together. It monitors what the student knows and where they still need practice. It teaches step-by-step how to subtract small numbers and then progresses to multi-borrow subtraction. SUBTRACTION is encouragement-based providing positive reinforcement for the student's effort both visually and auditorily. The student, parents, and teachers can all quickly see where the student needs more practice in a color-coded format. Go from simple math facts like 3-1=2 to more difficult equations such as 904-795, with the app showing you the correct answer if you make a mistake. Full customization is possible including choosing the specific digit combinations you want to review or practice. Excellent for beginners just learning subtraction or a quick review for slightly older students. Students practice writing numbers too. AI converts the student's handwritten numbers into digits. Single-digit subtraction is free. Multi-digit subtraction with borrowing along with custom colors, specific numbers to learn, different character voices, and background music requires an in-app purchase. FEATURES ► Simple and visually appealing ► Make it as easy or hard as you want + 1-3 digit numbers + without borrowing + with borrowing + only practice certain digits or all of them ► Step-by-step instructions if a student wants + forces precise digit order into the correct fields + makes it impossible to move on with a wrong digit + with visual instructions for each entry ► Animated character with encouragement + completely optional for older students + 3 different voices ► Complete customization + specific numbers included or excluded + color design of screens + option to show the correct answer in case of an error + choices of optional background music + sounds/vibrations on right/wrong answers + moves to the next problem if the correct answer is input ► Intelligent + Remembers mistakes and helps practice for mastery ► AI-based handwriting Recognition + write the answers + great for practicing handwriting ► Feedback / Monitoring + Positive/Negative sound reinforcement + Summary of progress in both table and graph form + Easy for student/parent/teacher to monitor progress ► NO ADS, ALL FEATURES ENABLED TERMS & CONDITIONS: http://www.programisprime.com/subtractionterms.html PRIVACY POLICY: http://www.programisprime.com/subtractionprivacy.html WE LOVE FEEDBACK We appreciate your feedback. Please email us at support@programisprime.com with any suggestions or questions. If you are happy with this update, please let us know by rating and reviewing us in the App Store! © 2023 Programis Prime LLC

Screenshots

The Letter Flash Machine3 screens
Subtraction Mathematics4 screens

Verdict

The call

The clearest difference is price: Subtraction Mathematics at Free against The Letter Flash Machine's $0.99. Subtraction Mathematics also leads on update cadence (fortnightly vs every 31 months) and ratings volume (28 vs 1). The Letter Flash Machine's advantage is rating (5.0 vs 4.2) and in-app purchases (none vs 1). On ads and device support 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

Subtraction Mathematics is free to download; The Letter Flash Machine costs $0.99 up front. Subtraction Mathematics sells 1 one-off in-app purchase. The Letter Flash Machine asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

The Letter Flash Machine holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Subtraction Mathematics has 28 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

The Letter Flash Machine ships an update every 31 months, Subtraction Mathematics fortnightly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
The Letter Flash Machine versus Subtraction Mathematics: the parameters behind the verdict, then further details
ParameterThe Letter Flash MachineSubtraction Mathematics
Price$0.99Free — better
Rating5.0 (1 ratings) — better4.2 (28 ratings)
Positive reviews—100.0% of reviews
Number of ratings128 — better
Update frequencyEvery 31 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size15 MB172 MB
Age rating4+4+
DeveloperVentura Educational SystemsPROGRAMIS PRIME LLC

Customer experience

The Letter Flash Machine

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Subtraction Mathematics

All ratings22 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

The Letter Flash Machine

No in-app purchases

1 purchases

Subtraction Mathematics

One-time1
  • Get All Features$3.99

Questions

Is The Letter Flash Machine free?
The Letter Flash Machine costs $0.99, with no in-app purchases.
Is Subtraction Mathematics free?
Subtraction Mathematics is free to download, with in-app purchases available.
Which has better reviews, The Letter Flash Machine or Subtraction Mathematics?
The Letter Flash Machine is rated higher. The Letter Flash Machine averages 5.0 out of 5 from 1 ratings, while Subtraction Mathematics averages 4.2 from 28 ratings.
Do The Letter Flash Machine or Subtraction Mathematics have ads?
Neither The Letter Flash Machine nor Subtraction Mathematics shows ads.
Which is updated more often, The Letter Flash Machine or Subtraction Mathematics?
The Letter Flash Machine ships an update every 31 months, and Subtraction Mathematics fortnightly. Most recently, The Letter Flash Machine was updated on November 1, 2026 and Subtraction Mathematics on November 3, 2026.

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