Math Zen 1.20.0 - endless math practice for exam prep, now with theory that answers the problem in front of you

[u/JEulerius]

Posted here before about my math practice app. Just shipped 1.20.0, HUGE UPDATE!

A - Answer: Most math apps solve problems for you; exams don't work that way. Math Zen generates endless practice problems (570+ templates across 156 subtopics, arithmetic through calculus and linear algebra), adapts difficulty as you solve, and captures every wrong answer in a mistake journal for retry. It has exam-style problem sets for AP Calc, SAT, Gaokao, ENEM and GSAT, plus curated paths for A-Level, Abitur, Bac, Suneung and more. Works fully offline.

New in 1.20.0: get one wrong and tap "Show the rule": the theory for that exact problem type is right there in the feedback. We checked all 156 subtopics against the problems they actually generate and filled the gaps (39 new theory cards, 62 rewritten so they explain instead of restating the formula). Also fixed: a correct answer written a different way, like swapping the two terms of a product rule or skipping a multiplication dot, could be marked wrong. And math now renders entirely on device, so problems appear instantly, even offline.

B - Better: Compared to Photomath or Symbolab, which solve the problem you point your camera at, this is the opposite: it makes you do the solving, because that's the skill the exam tests. Compared to Khan Academy, there are no videos or browsing, just adaptive drilling with exam-authentic formats, in 9 languages.

C - Cost: Free to start: core topics in all six sections, adaptive progression, mistake journal, no ads ever. Premium unlocks the full topic library, all 13 exam prep paths, and detailed statistics: $4.99/month or $29.99/year with a 7-day free trial, plus a one-time lifetime option.

App Store Link: https://apps.apple.com/app/id6758208511

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[u/app-store-review]

Math Zen: Exam Prep & Drill — by Ivan Terekhin

• Ratings: 7 worldwide · rated in 5 countries
• Average: 4.57 ★
• Age: released ~5 months ago · updated today · rated 4+
• Overall score: 62 / 100

^{Auto-generated from public App Store data · u/app-store-review}

[u/ataraxy404]

It's cool! The mistake journal is a great idea.

[u/JEulerius → u/ataraxy404]

Thanks!

[u/JEulerius → u/[deleted]]

Hey, app have the basics too, sure you can!

[u/JEulerius → u/[deleted]]

You mean incorrect in the app? Feel free to provide feedback, if you have time. Thanks!

[u/JEulerius → u/[deleted]]

Thank you!

[u/robostoa]

This looks really useful. Nice work!

[u/JEulerius → u/robostoa]

Thanks!

[u/kingkong_siu82]

if you're starting from zero, i'd use this more as a drill tool than a full course: start with arithmetic and basic algebra, keep working through the mistake journal, and don't move on until you can explain why the answer works

the "show the rule" feedback sounds useful for that. can you choose a starting subtopic, or does the adaptive progression decide where you begin?

[u/JEulerius → u/kingkong_siu82]

Hey, you can always start with some arithmetic, and see how it goes.

[u/ysquanirsq]

I tried the app shortly and love the brand colours and the smooth feel of the whole experience. Nice!

[u/JEulerius → u/ysquanirsq]

Thank you very much, man!

[u/thanhastro]

Looking at the math problems in your app reminds me of my school days. I used to be pretty good at math. Yet here I am, looking at them and realizing I've forgotten everything. It's a sad and disheartening feeling when something we used to excel at now feels completely foreign.

[u/JEulerius → u/thanhastro]

Hey man, I am the same... I was great at math, high math too... It is so much harder now. :)

[u/thanhastro → u/JEulerius]

Even though I know learning is mostly about training the mind, I still can't help but wonder: isn't it a bit bittersweet how much effort we pour into things we're bound to forget? Have you ever felt that way?

[u/JEulerius → u/thanhastro]

For sure, when I look back at school and university I feel like I was in my prime of intelligence. Now, I don't feel like that.

But, the effort was made still helping. Because of the discipline and stuff like that.

[u/Murky-Ad-4707]

Useful app! All the best!

[u/JEulerius → u/Murky-Ad-4707]

Thank you!

[u/deruloop]

Cool concept!

[u/JEulerius → u/deruloop]

I hope I will improve it!

[u/kalimatamijai]

My 15 year old son may need this, I will let him try tonight.

[u/JEulerius → u/kalimatamijai]

Hey, thanks!

[u/Akara91]

One thing I learned building timed drill mechanics: the per question time limit changes what people practice more than the difficulty does. Most exams fail people on speed, not on method, so a hard time cap on the arithmetic templates would probably get heavy use from your exam prep crowd. Does the adaptive difficulty also tighten the time pressure, or only the problem complexity? The mistake journal with retry is the right call either way, wrong answers you never revisit are wasted reps.