Comparison

Subtraction Math Trainer vs NCA

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

Head to head
About

Subtraction Math Trainer

Features
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Subtraction Math Trainer is a math learning app designed to help you to practice subtraction. The built-in handwriting recognition allows you to draw answers directly on the screen. Comes with a number of simple mini-games to make learning more effective and less boring. You can practice the following math skills: Subtraction facts - numbers up to 10 Subtraction facts - numbers up to 18 Subtract a multiple of ten Relate addition and subtraction Subtraction facts - numbers up to 20 Subtract a one-digit number from a two-digit number Subtract two two-digit numbers Subtract multiples of 10 Subtract multiples of 100 Subtract multiples of 10 or 100 Balance subtraction equations Subtraction facts - numbers up to 100 Subtract two three-digit numbers Complete the subtraction sentence up to three digits Subtract numbers with four or five digits Balance subtraction equations up to three digits

About

NCA

Features
Read full description

PASS YOUR NVIDIA NCA-AIIO: AI INFRASTRUCTURE AND OPERATIONS EXAM 500+ practice questions 5-minute study sessions Track your progress Remove mastered questions Text-to-speech support Dark mode available WHY GET CERTIFIED? Certified AI infrastructure professionals earn up to $203K annually (Skillsoft 2024). NCA-AIIO validates foundational knowledge of AI computing infrastructure and operations in enterprise environments. WHAT YOU'LL MASTER: NVIDIA software stack for AI environments Training vs inference architecture requirements AI, machine learning, and deep learning concepts GPU vs CPU architectures and acceleration NVIDIA TensorRT and GPU Operator DGX SuperPOD and data center platforms Bluefield DPU for workload offloading InfiniBand and NVSwitch networking Kubernetes orchestration and job scheduling Data analysis and visualization techniques Model evaluation with statistical metrics Energy-efficient computing strategies Cloud AI deployment considerations MLOps and AI lifecycle management STUDY ANYWHERE: Coffee breaks. Commutes. Lunch hours. Turn dead time into AI infrastructure expertise. Download now. Pass your exam. Master NVIDIA AI infrastructure.

Screenshots

Subtraction Math Trainer4 screens
NCA3 screens

Verdict

The call

The clearest difference is price: NCA at Free against Subtraction Math Trainer's $2.99. NCA also leads on update cadence (every 3 months vs every 34 months). Subtraction Math Trainer's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases 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

NCA is free to download; Subtraction Math Trainer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Subtraction Math Trainer ships an update every 34 months, NCA every 3 months. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 3 level
Subtraction Math Trainer versus NCA: the parameters behind the verdict, then further details
ParameterSubtraction Math TrainerNCA
Price$2.99Free — better
Update frequencyEvery 34 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size18 MB26 MB
Age rating4+4+
DeveloperSergey MaluginDavy Raitt

In-app purchases

None

Subtraction Math Trainer

No in-app purchases

None

NCA

No in-app purchases

Questions

Is Subtraction Math Trainer free?
Subtraction Math Trainer costs $2.99, with no in-app purchases.
Is NCA free?
NCA is free to download, with no in-app purchases.
Do Subtraction Math Trainer or NCA have ads?
Neither Subtraction Math Trainer nor NCA shows ads.
Which is updated more often, Subtraction Math Trainer or NCA?
Subtraction Math Trainer ships an update every 34 months, and NCA every 3 months. Most recently, Subtraction Math Trainer was updated on October 31, 2026 and NCA on October 28, 2026.

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