6 Mental Math Apps Compared: Speed, Practice, and Interviews

Quick verdict

• Best for a structured course plus focused drills: Mental Math Pro.
• Best iPhone all-rounder: Numbio, based on its current App Store listing.
• Best iOS explanations and practice modes: Mental Math Cards, based on its current App Store listing.
• Best for game variety: Coolmath Games, although it is not a focused arithmetic curriculum.
• Best simple iOS score chase: Brain Training: Mental Calc, based on its listing.
• Best no-frills browser speed drill: Zetamac.

If you are preparing for an interview, start with the timer and difficulty controls. If you are learning a method, prioritize explanations and immediate targeted practice.

How I compared the apps

I checked the same fields for every product: platform, price model, timer, difficulty controls, answer feedback, history, interview fit, account requirement, and limitations. “Direct test” means I opened the browser product and completed or configured a practice flow. “Research-based” means the entry relies on the linked first-party store listing.

1. Mental Math Pro

Best for: learning a defined method, then practicing that exact skill.

• Review status: First-party and directly tested.
• Platform: Browser.
• Price: Free practice tools; account and one-time payment for the full strategy course.
• Timer: Timed presets, a balanced 90-second test, and lesson records.
• Difficulty controls: Operation, ranges, question count, time, times tables, and percentage modes.
• Feedback and history: Submitted-answer accuracy, response-time summaries, operation breakdowns, and a bounded private history.
• Interview fit: Strong for arithmetic foundations and consulting-style prompts.
• Account required: No for free practice and the speed test; yes for the paid course and cross-session account history.
• Limitations: This is my own product, so treat the verdict as a product description rather than an independent endorsement. It also focuses on arithmetic rather than a large library of unrelated puzzles.

2. Numbio (formerly FastMath)

Best for: iPhone users who want a broad training app with streaks and progression.

• Review status: Research-based from the current App Store listing.
• Platform: iPhone.
• Price: Free with in-app purchases; the listing marks advanced features as requiring Numbio Pro.
• Timer: A 60-second speed test is listed.
• Difficulty controls: Easy through Extreme, plus custom training plans in Pro.
• Feedback and history: The listing describes detailed speed and accuracy statistics, personal bests, goals, ranks, and streaks.
• Interview fit: Potentially useful for short timed arithmetic and broader quantitative practice.
• Account required: The listing describes cross-device sync but does not make the minimum account requirement clear enough to confirm here.
• Limitations: App Store-only for this comparison, and many advanced operations are marked as Pro features.

3. Mental Math Cards

Best for: iOS users who want explanations alongside drills.

• Review status: Research-based from the current App Store listing.
• Platform: iPhone, iPad, and compatible Mac devices.
• Price: Free with in-app purchases; the listing showed monthly and annual Pro options when checked.
• Timer: Timed challenge modes are described.
• Difficulty controls: Multiple levels across addition, subtraction, multiplication, division, and mixed practice.
• Feedback and history: Step-by-step instructions, progress tracking, goals, achievements, and leaderboards are listed.
• Interview fit: The listing explicitly positions advanced arithmetic for quantitative interviews.
• Account required: No separate product account was confirmed; some competitive features use Game Center.
• Limitations: App Store-only for this comparison, and the most useful tracking features may sit behind the Pro subscription.

4. Coolmath Games

Best for: variety and low-friction browser play.

• Review status: Browser-accessible and directly explored.
• Platform: Browser, with separate mobile offerings also promoted by the company.
• Price: Many browser games are free to play.
• Timer: Varies by game rather than using one consistent arithmetic test.
• Difficulty controls: Varies widely by game.
• Feedback and history: Game-specific; there is no single mental-math history across the whole catalog.
• Interview fit: Low. It is a game collection, not a focused interview trainer.
• Account required: Individual browser games can be opened without creating an account.
• Limitations: Finding a relevant arithmetic game takes more navigation, and practice is not organized as a progressive mental-math curriculum.

5. Brain Training: Mental Calc

Best for: a simple iOS score-and-ranking loop.

• Review status: Research-based from the current App Store listing.
• Platform: iPhone and iPad.
• Price: Free when checked.
• Timer: The listing rewards faster correct answers, though it does not document flexible timer controls.
• Difficulty controls: Addition, subtraction, and multiplication with harder questions worth more points.
• Feedback and history: Recorded results and Game Center rankings are listed.
• Interview fit: Limited: it can rehearse quick basics, but the listing does not show percentages, estimation, or exhibit work.
• Account required: No separate account requirement is documented; rankings use Game Center.
• Limitations: The listing shows an older version history and no developer-provided privacy details, so check the store page before installing.

6. Zetamac

Best for: a fast, distraction-light browser drill.

• Review status: Browser-accessible and directly tested.
• Platform: Browser.
• Price: Free.
• Timer: A two-minute default with selectable duration.
• Difficulty controls: Numeric ranges for addition and multiplication, with subtraction and division generated as reversals.
• Feedback and history: Immediate drill scoring; no persistent personal history was visible in the core flow.
• Interview fit: Good for arithmetic speed, especially before trading or quantitative screens, but it does not teach methods.
• Account required: No account in the core drill.
• Limitations: Minimal explanation, no guided weakness recommendation, and no percentage or verbal/exhibit practice in the core tool.

Best for interview practice

For a pure arithmetic screen, Zetamac is the quickest way to start. For a breakdown that includes percentages, estimation, verbal math, and exhibits, use a consulting-specific workflow. Mental Math Cards and Numbio may suit iPhone practice, but those entries are research-based here and should be checked in the App Store before you pay.

What to choose

Choose the smallest tool that matches the job:

• Pick a timer-first tool if you already know the methods and need speed.
• Pick explanations plus targeted drills if errors come from not knowing how to decompose a problem.
• Pick a game collection if variety is what keeps you practicing.
• Check current store pricing, privacy details, and renewal terms before buying an app subscription.