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.
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.
- Letter recognition games
- Keyboard matching activity
- Picture-based letter identification
- Performance tracking
- Pronouncing letters
- Sound effects for engagement
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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.
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.
- Multi-digit subtraction with borrowing
- Step-by-step instructions
- AI handwriting recognition
- Progress monitoring with color-coded feedback
- Customizable digit combinations
- Encouragement-based learning
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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
Verdict
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
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.
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.
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.
| Parameter | The Letter Flash Machine | Subtraction Mathematics |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.2 (28 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 28 — better |
| Update frequency | Every 31 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 15 MB | 172 MB |
| Age rating | 4+ | 4+ |
| Developer | Ventura Educational Systems | PROGRAMIS PRIME LLC |
Customer experience
The Letter Flash Machine
Subtraction Mathematics
In-app purchases
The Letter Flash Machine
No in-app purchases
Subtraction Mathematics
- Get All Features$3.99
Questions
Is The Letter Flash Machine free?
Is Subtraction Mathematics free?
Which has better reviews, The Letter Flash Machine or Subtraction Mathematics?
Do The Letter Flash Machine or Subtraction Mathematics have ads?
Which is updated more often, The Letter Flash Machine or Subtraction Mathematics?
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