Comparison

Prime Factors vs Montessori Math

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

Head to head
About

Prime Factors

Explore numbers up to one trillion, with primes clearly marked. Tap any number to reveal its prime factors. Easily navigate to specific numbers using the search function and adjust the display with pinch-to-zoom gestures.

Highlights
  • View numbers up to 1 trillion
  • Prime numbers highlighted
  • Tap for prime factors
  • Search for specific numbers
  • Pinch and zoom display
Features
Read full description

View all numbers from 1 to 1,000,000,000,000. Prime numbers shown with a red circle. Tap a number to see its Prime Factors. Jump directly to a number with the search field. • Prime Numbers are marked with a red circle • Prime Factors can be viewed by tapping on a number • Pinch and Zoom to change the number of columns

About

Montessori Math

This app teaches math concepts for children aged 3 and up, from basic preschool skills to arithmetic. It features interactive activities like the Hundred Board and Fractions, designed with Montessori principles. Audio and graphics support non-readers.

Highlights
  • Interactive math activities
  • Montessori-inspired learning
  • Covers preschool to arithmetic
  • Audio and visual support
  • Self-correcting activities
  • Progress tracking
Features
Read full description

Ages 3 & Up. Learn and practice mathematics, starting with basic concepts for preschoolers and progress up to learning arithmetic. We have included our most popular activities, such as the Hundred Board, Skip Counting, Fractions, and more. You can download the app for free and browse through the activities before subscribing. Preschool children who cannot read yet can still learn everything presented by use of the integrated audio and graphics. Activities included with this release: PINK TOWER - Learn to identify different sizes and follow a sequence to assemble patterns. PATTERNING - Observe and practice patterning concepts to build math readiness skills. GEOMETRIC CABINET - Learn to identify and name geometric shapes. CARDS & COUNTERS - Learn to count from 1 to 10 and understand the quantity that each number represents. HUNDRED BOARD - Count from 1 to 100 using the 10x10 Hundred Board format. HUNDRED BOARD 101-200 - Learn the concept of counting beyond 100. COUNT TO 1000! - Practice counting from 1 all the way to 1000 and practice individual sets. SKIP COUNTING - Learn to skip count using the Hundred Board by 2s, 3s, 4s, etc. HUNDRED BOARD PATTERNS - Practice your knowledge of numbers out of sequence and assemble colorful patterns with numbers. NUMBER SEQUENCING - Practice identifying numbers by finding What Comes Before, After & In-Between? FRACTIONS - Learn the concept of breaking a whole into equal parts and progress up to identifying fractions numerically. ADDITION CHARTS - Visualize the basic addition equations with charts. ADDITION TABLES - Practice the Addition Tables over and over. SUBTRACTION CHARTS - Visualize the basic subtraction equations with charts. SUBTRACTION TABLES - Practice the Subtraction Tables over and over. MULTIPLICATION CHARTS - Visualize the basic multiplication equations with charts. MULTIPLICATION TABLES - Practice the Multiplication Tables over and over. DIVISION CHARTS - Visualize the basic division equations with charts. DIVISION TABLES - Practice the Division Tables over and over. These math activities are designed for both classroom and home use. All activities are self-correcting and self-guided. You will be pleasantly surprised how much children will be able to learn and retain with this app. Our design team consists of Engineers and a former Montessori Directress, AMI certified, with over 40 years of Montessori classroom experience. We have done our best to respect the Montessori method and bring you activities that take advantage of the digital age. Thank you so much for your support and we plan to continue to add new activities to this app for expanded learning. Terms of Use & Privacy Policy can be found here: http://www.mobilemontessori.org/privacy

Screenshots

Prime Factors4 screens
Montessori Math4 screens

Verdict

The call

The clearest difference is price: Montessori Math at Free against Prime Factors's $0.99. Montessori Math also leads on update cadence (every 3 months vs every 21 months) and iOS requirement (12.0 vs 18.0). Prime Factors's advantage is in-app purchases (none vs 2) and review sentiment (79% vs 50%). 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

Montessori Math is free to download; Prime Factors costs $0.99 up front. Montessori Math sells 2 in-app purchases, starting at $3.99 per month. Prime Factors asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Prime Factors holds the better App Store score, 3.9 against 3.5. Both are backed by a comparable volume of ratings — 24 and 6 respectively. Written reviews point the same way: 79% of Prime Factors's written reviews are positive against 50% of Montessori Math's.

UpkeepUpdate frequency

Prime Factors ships an update every 21 months, Montessori Math every 3 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

Scorecard8 real differences · 2 level
Prime Factors versus Montessori Math: the parameters behind the verdict, then further details
ParameterPrime FactorsMontessori Math
Price$0.99Free — better
Rating3.9 (24 ratings) — better3.5 (6 ratings)
Positive reviews78.6% of reviews — better50.0% of reviews
Number of ratings24 — better6
Update frequencyEvery 21 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.012.0 — better
Further details — not scored
Size1 MB385 MB
Age rating4+4+
DeveloperPaul HangasRantek Inc.

Customer experience

Prime Factors

All ratings24 ratings
Positive70.8%
Neutral0.0%
Negative29.2%
Written reviews28 reviews
Positive78.6%
Neutral0.0%
Negative21.4%

Montessori Math

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Prime Factors

No in-app purchases

2 purchases

Montessori Math

Subscriptions2
  • Montessori Math Monthly Sub.7 Days trial$3.991 Month
  • Montessori Math Yearly Sub.7 Days trial$39.991 Year

Questions

Is Prime Factors free?
Prime Factors costs $0.99, with no in-app purchases.
Is Montessori Math free?
Montessori Math is free to download, with in-app purchases available.
Which has better reviews, Prime Factors or Montessori Math?
Prime Factors is rated higher. Prime Factors averages 3.9 out of 5 from 24 ratings, while Montessori Math averages 3.5 from 6 ratings.
Do Prime Factors or Montessori Math have ads?
Neither Prime Factors nor Montessori Math shows ads.
Which is updated more often, Prime Factors or Montessori Math?
Prime Factors ships an update every 21 months, and Montessori Math every 3 months. Most recently, Prime Factors was updated on October 24, 2026 and Montessori Math on October 7, 2026.

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