Comparison

Kalley's Machine Plus Cats vs First Grade Math Trainer

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

Head to head
About

Kalley's Machine Plus Cats

An interactive storybook where a child's imaginative drawing of a machine comes to life. Explore playful interactions, help the machine perform various actions, and engage with whimsical cats. Features include read-to-me and touch-to-read options for young readers.

Highlights
  • Interactive machine play
  • Smash, inflate, shrink, and mold objects
  • Interact with cats
  • Read-to-me narration
  • Touch-to-read word highlighting
  • Child-friendly controls
Features
Read full description

Based on a true story of childhood optimism, Kalley’s Machine Plus Cats is the super-fun interactive story about a 4-year-old girl’s drawing and her heartwarming plan to save her dad from his daily commute. PRESS ----------------------------------------------- USA Today (4/4 Stars) : “This app showcases some of the most elegant interactions ever placed inside of a kids’ book app.” Common Sense Media (5/5 Stars) : “Kalley’s excitement about her cool machine is contagious.” 148 Apps (4.5/5 Stars) : “I am so very impressed with the wonderful and witty machines ... as well as the overall quality of this app.” The iMums (5/5 Stars) : “A beautiful and brilliant storybook app unlike any I have ever seen.” AWARDS & HONORS ---------------------------- * USA Today’s 10 TOP KIDS APPS of 2014 * Kirkus’ BEST BOOK APPS of 2014 * 2014 Cybils AWARD WINNER * Common Sense Media's Best Book Apps for Kids * TechWithKids BEST PICK APP * THE KIRKUS STAR - Awarded to Books of Exceptional Merit * mFWA Mobile of the Day - for Interactive Experience STORY ---------------------------------------------- When Kalley shows her dad her drawing for a new machine, he is baffled by the confusing collection of hammers, gears, fire, smoke and conveyors. As Kalley explains each part of her invention, the drawing comes to life even as its overall purpose becomes less and less clear to her dad. It is only when Kalley explains the machine’s final component that her master plan to keep her dad from commuting is revealed. THE STORY BEHIND THE STORY --------- So, there really is a ‘Kalley’. She really drew a machine. Her dad couldn’t build it. So they made an app out of it instead. Full story at kalleysmachine.com. FEATURES ---------------------------------------- ► PLAY WITH MACHINES! Kalley’s Machine was crafted with interactivity as the first priority. Satisfyingly touchable controls put kids in charge of each twist and smash of the machine. Controls come in a wide machiney variety: ● Cranks ● Sliders ● Dials ● Levers ● Switches ● Buttons With the machine, kids can: ● Smash Stuff ● Inflate Stuff ● Shrink Stuff ● Burn Stuff (or lightly toast it) ● Paint Stuff ● Grab Stuff ● Drop Stuff ● Mold Stuff Into Shapes ● Do A Few Other Things Including... ► MESS WITH CATS! Kalley’s Machine is a story based on a 4 year-old girl’s drawing. As such, it includes cats. They are completely irrelevant to the story. However, they are way fun to harass. Tease them. Scare them. Puzzle them. Adore them. We think you’ll love the cats. ► GET YOUR READ ON! Cuz it’s a story, right? Of course, you can read the story the old-fashioned way. But, to aid new readers, we’ve also included two helpful interactive story features: ● Read-to-Me, narrated by Kalley and her dad with highlighted words. ● Touch-to-Read, where words are spoken when they are touched. ► TRY TO LEARN! Honestly, we designed this story to be fun. But if you're not careful, you might actually learn something too! The interactive medium offers kids great chances to explore some basic concepts which are both safer and less messy than their real-world alternatives. Creative parents may recognize the opportunity to discuss: ● Subtractive Color Mixing ● Pressure/Temperature Relationships ● Gear Ratios ● Air Pressure/Vacuums ● How Overcooking Can Burn Stuff ► KEEP KIDS SAFE! We have made this app super-safe for kids by having: ● No Ads ● No In-App-Purchases ● Parental Gates in Our Parents Section

About

First Grade Math Trainer

Features
Read full description

First Grade Math Trainer transforms early math learning into a fun, interactive experience. With intuitive handwritten input, kids can practice addition and subtraction by physically writing numbers on-screen. The app features two modes – a self-paced Math Trainer for mastering facts without pressure and the engaging Math Shot mini-game that adapts to each child's skill level. Whether solving simple addition up to 10 or more complex subtraction problems, young learners enjoy hands-on practice that builds confidence and fluency in essential math skills. With First grade Math Addition you can practice and improve the following skills: - Addition up to 10 - Addition up to 18 - Addition up to 20 - Add a number to a multiple of ten - Add two multiples of ten - Add doubles - Add three numbers up to 10 each - Relate addition and subtraction With First grade Math Subtraction you can practice and improve the following skills: - Subtraction facts - numbers up to 10 - Subtraction facts - numbers up to 18 - Subtraction facts - numbers up to 20 - Subtract multiples of 10 - Subtract a multiple of ten - Relate addition and subtraction - Subtract one-digit number from two-digit number - Subtract two two-digit numbers With Addition Skill Builders you can practice and improve the following skills: - Adding 1 - Adding 2 - Adding 3 - Adding 4 - Adding 5 - Adding 6 - Adding 7 - Adding 8 - Adding 9 - Adding 10 With Subtraction Skill Builders you can practice and improve the following skills: - Subtracting 1 - Subtracting 2 - Subtracting 3 - Subtracting 4 - Subtracting 5 - Subtracting 6 - Subtracting 7 - Subtracting 8 - Subtracting 9 - Subtracting 10

Screenshots

Kalley's Machine Plus Cats4 screens
First Grade Math Trainer4 screens

Verdict

The call

The clearest difference is price: Kalley's Machine Plus Cats at Free against First Grade Math Trainer's $2.99. Kalley's Machine Plus Cats also leads on update cadence (every 5 weeks vs every 26 months). On ads, in-app purchases, 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

Kalley's Machine Plus Cats is free to download; First Grade Math Trainer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Kalley's Machine Plus Cats ships an update every 5 weeks, First Grade Math Trainer every 26 months. The most recent releases landed on September 18, 2026 and September 16, 2026 respectively.

Scorecard2 real differences · 8 level
Kalley's Machine Plus Cats versus First Grade Math Trainer: the parameters behind the verdict, then further details
ParameterKalley's Machine Plus CatsFirst Grade Math Trainer
PriceFree — better$2.99
Rating4.7 (37 ratings) — better—
Positive reviews92.5% of reviews—
Number of ratings37 — better—
Update frequencyEvery 5 weeks — betterEvery 26 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size35 MB17 MB
Age rating4+4+
DeveloperRocketWagon, LLCSergey Malugin

Bugs and requests

Kalley's Machine Plus Cats

Reported bugs

3 issues
  • Cannot get past the first page
  • No sound at all
  • Navigation issues on older devices

Requested features

5 requests
  • Disable swipe feature
  • More interactive elements on the last page
  • More content/sequels/series
  • More interaction with cats
  • More interactive elements in general

First Grade Math Trainer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Kalley's Machine Plus Cats

No in-app purchases

None

First Grade Math Trainer

No in-app purchases

Questions

Is Kalley's Machine Plus Cats free?
Kalley's Machine Plus Cats is free to download, with no in-app purchases.
Is First Grade Math Trainer free?
First Grade Math Trainer costs $2.99, with no in-app purchases.
Do Kalley's Machine Plus Cats or First Grade Math Trainer have ads?
Neither Kalley's Machine Plus Cats nor First Grade Math Trainer shows ads.
Which is updated more often, Kalley's Machine Plus Cats or First Grade Math Trainer?
Kalley's Machine Plus Cats ships an update every 5 weeks, and First Grade Math Trainer every 26 months. Most recently, Kalley's Machine Plus Cats was updated on September 18, 2026 and First Grade Math Trainer on September 16, 2026.

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