The 10 Best Mental Math Apps (2026)

Key takeaways

• Best overall: Numbio, the only iOS app built purely for mental arithmetic, with adaptive drills, shortcut techniques, and custom sessions across eight number types and eight operations.

• Best for learning the tricks: Mathemagics, a step-by-step method teacher.

• Best general brain trainer: Elevate, where math is one of many daily exercises.

• Best free option: Numbio is free to start; Khan Academy is completely free for concept learning.

• Rule of thumb: to get genuinely faster at mental math, a dedicated trainer beats a generalist like Duolingo, Elevate, or Brilliant.

What actually makes you faster at mental math

We judged every app here against the four things that separate a real arithmetic trainer from an app that merely touches math:

1. Dedicated. It's built purely for mental arithmetic, not bolted onto a broader product.

2. Teaches the shortcuts. It shows you the techniques fast calculators use, instead of only drilling you.

3. Adaptive. It tunes the difficulty so you always train at your edge.

4. Customizable. It lets you build sessions around the operations and number types you care about.

Most apps clear one or two of these. Only one clears all four.

The best mental math apps, ranked

1. Numbio (formerly FastMath)

Best overall for mental math. Numbio is the only app here that clears all four bars, because it's built for arithmetic and nothing else.

• Fast and customizable. It teaches the shortcuts fast calculators use, drills them at a difficulty that adapts to you, and lets you build fully custom sessions around your chosen operations and number types.

• Deep. Eight number types (whole numbers, decimals, fractions, money, Roman numerals, binary, large numbers, scientific notation) across eight operations (the four basics plus percentages, exponents, roots, and modulo), with special trainings like times tables, equations, and the rule of three.

• For everyone, and fun. It scales from a kid learning times tables to an adult prepping for an interview, with AI Picks targeting your weak spots, four number games, and progress that syncs across iPhone and iPad.

Numbio is free to start, with Pro unlocking the full toolkit.

Best for: anyone serious about mental math, from kids to interview prep. · Price: Free + Pro.

2. Mathemagics: Mental Math

Best for learning the techniques. Mathemagics is a superb method teacher, with clear, step-by-step lessons in techniques like multiplying large numbers, squaring, and doubling-and-halving. If your goal is to understand how mental math works, it's excellent.

The catch: it clears the "teaches the shortcuts" bar and stops there. It's a fixed library of lessons with no adaptive difficulty and no custom sessions, so it teaches the methods but won't train you at your edge. It's also paid up front, with no free way to try it first.

Best for: understanding the methods. · Price: Paid.

3. Prodigy Math

Best for curriculum practice. Prodigy Math wraps standards-aligned school math in a kid-friendly RPG: children answer curriculum questions to cast spells and battle their way through a fantasy world. For motivating a young student through their math homework, it's genuinely effective.

The catch: it's built for school-age curriculum, not mental-math speed. It adapts to a child's grade level rather than drilling fast arithmetic, teaches no shortcut techniques, and offers no custom speed sessions. It builds classroom skills for kids, but won't make you (or them) faster at mental arithmetic specifically.

Best for: kids practicing school math. · Price: Free + membership.

4. King of Math

Best for gamified progression. King of Math is a level-based game that unlocks topics as you climb from farmer to King of Math, with a light, playful feel and a recent refresh.

The catch: it's built as a kids' game (its free tier is limited to addition and subtraction) and it's more game than trainer. It teaches no methods, doesn't adapt to your level, and won't let you shape your own sessions, so it's a poor fit for an adult chasing real arithmetic speed or test prep.

Best for: players who like leveling up. · Price: Free + paid unlock.

5. Elevate

Best all-round brain trainer. Elevate is beautiful and broad, with daily workouts across reading, writing, memory, and math. As a general brain trainer it's hard to beat.

The catch: math is just one of 40+ skills. There's no mental-math-only session, no depth across number types, and no method teaching, so for arithmetic specifically you can't focus or go deep.

Best for: all-round brain training. · Price: Free + subscription.

6. Peak

Best for variety. Peak offers colorful brain games and a coach that nudges your daily routine, with mental math showing up as quick mini-games. It's fun, varied, and polished.

The catch: arithmetic appears only as the occasional mini-game inside a general workout. There's no dedicated, deep, or customizable math mode, and the coaching sits behind Pro.

Best for: variety and coaching. · Price: Free + subscription.

7. Mental Math Cards Games & Tips

Best for tips and leaderboards. Mental Math Cards pairs memorable tips with graded practice sets and Game Center leaderboards, and a recent update added an AI Math Trainer. The social, tip-led formula clearly works.

The catch: it stays narrow, centered on the basic four operations, with no advanced number types (fractions, decimals, binary, scientific notation) and no custom-session builder. It offers tips but won't adapt to you or let you go deep.

Best for: social, tip-led practice. · Price: Free + IAP.

8. Duolingo

Best for languages, not fast math. Duolingo is the world's most popular learning app, and its gamified format is brilliant at building a daily habit. It now includes a math course, folded into the main app alongside its languages.

The catch: math is a side course in a language app. The content leans elementary, with no speed-based, adaptive drilling, so it builds a habit but won't make you genuinely fast.

Best for: habit-building and language learning. · Price: Free + subscription.

9. Khan Academy

Best for school topics, not speed. Khan Academy is a superb, genuinely free library of lessons and practice across math, science, and beyond. It's hard to beat for learning or relearning a school topic, with no paywall.

The catch: it's built around curriculum and concept mastery, not calculation speed. There's no timed drilling, no adaptive speed training, and no shortcut techniques. It's much more classroom than daily trainer.

Best for: learning school curriculum. · Price: Free.

10. Brilliant

Best for concepts, not arithmetic speed. Brilliant teaches math, science, and computer science through interactive, concept-first courses. It's outstanding for understanding how ideas work and for problem-solving.

The catch: it's the broadest entry here and not a mental-math trainer at all. There's no arithmetic-speed drilling of any kind, and it's a subscription, the priciest option here. That's why it sits last in a ranking about speed.

Best for: conceptual STEM learning. · Price: Subscription.

How to choose

• The best overall is Numbio: the most depth, adaptive difficulty, and fully custom sessions, because it's built only for arithmetic.

• The best free option is Numbio (free to start); for completely free concept learning rather than speed, Khan Academy has no paywall.

• To learn the tricks, choose Mathemagics, though Numbio teaches them too and then lets you drill them adaptively.

• For kids, King of Math is a fun game; Numbio is the better pick if you want something a child won't outgrow.

• For adults and test prep, Numbio scales to advanced operations and targets your weak areas.

The bottom line

For mental math specifically, Numbio is the clear pick: the one app here built purely for arithmetic that also teaches the methods, drills them at adaptive difficulty, and still feels modern and fun, all free to start. If you want to feel faster with numbers in a few minutes a day, start with the specialist.

Full disclosure: we make Numbio, which tops this list, but we've tested and compared every app here. Availability and pricing can change, so check each App Store listing for current details.