One By One: Mental Math appears to be a legitimate app. The AppsHunter Legitimacy Score for One By One is 90 out of 100 points across 7 verification signals from App Store and developer data.

One By One User Reviews

Name: One By One: Mental Math
Rating: 4.8 (77 reviews)

One By One: Mental Math

Brice Brown

Customer Experience

Positive experience90.9% of reviews

Neutral4.5% of reviews

Negative experience4.5% of reviews

~ Based on 22 written reviews from the US App Store.

Is One By One Safe?

One By One: Mental Math appears safe based on user ratings. AppsHunter Safety Score for One By One is 91/100.

This assessment is based on 77 user ratings, with an App Store average of 4.8/5.

Safety Analysis

94.8% of ratings point to a safe experience

1.3% of ratings suggest some concerns

3.9% of ratings point to a risky experience

~ Based on 77 App Store ratings for One By One.

Is One By One Legit?

One By One: Mental Math appears to be a legitimate app. AppsHunter Legitimacy Score for One By One is 90/100.

Based on 90 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

Most Recent Highest Rated Lowest Rated

Incorrect Calculation?

tan(5pi/6) is wrong. I’m unsure what the answer has been programmed to be but whatever it is, it’s not accurate. Other than that, great game.

williamweatherby

3 years ago

Almost Perfect

This is a wonderful app and great opportunity for practicing mental math. And this is why I care enough to make a bug report.

Please fix calculus. Some of the answers require infinity, and this is not allowed in the answers. For example, I recently got the question: Given h(x) = 8/x find h’(0). The answer is -∞ as this is the limit from the left and right hand sides, but this is impossible to enter with the ‘Differential Departments’ keyboard.

One possible stopgap solution would be to make the correct answers available if you pay for a skip (with in-game currency), this way we users can figure out what the game wants in such strange situations. Alternatively, you could take away the questions generating these issues, possibly by plugging all differentiation questions into the Wolfram engine to check the outcomes and then deleting the ones that don’t match. Of course, this won’t work if the questions are auto generated and not drawn from a bank —unless you run all possible questions (which would probably take a long time).

AAFMOHEM

3 years ago

Love it, want more!

I’ve been having a lot of fun with the app! The derivative and trig section is great practice to knock the rust off my calc now that I’m back in complex analysis. I’d love to see more sections added such as integrals, combinatorics, some kind of series stuff, maybe even some set theory unions and intersections type stuff! I would pay for some extra packs of the sorts! Thanks!

Jawwastar

3 years ago

Response from developer

Wow thank you for the amazing review! It is awesome to see that the app is appealing even for such a high level of math! Those modes would be great to see in the app one day.

Wonderful math app!!

My free time is so much more productive with this fun app! The way that the problem streaks are timed makes it exciting and the currency system feels rewarding. Using this app is just as fun as other puzzle games but instead of mindless puzzles, it helps you develop practical knowledge! The user interface is also really well done, stable, and easy to use. I reccomended this app to anyone trying to improve their quick math skills! The only gripe that I have is that there isn't an 'explanation' section in the app to refresh my memory on how to do some of these problems. But other than that the app is perfect for math lovers! You won't regret downloading it, especially if you love math! 😄

Dalton Suede

3 years ago

Response from developer

Thank you so much for the kind words! I’m glad to see that the focus on making the experience rewarding worked out. I do agree that having a little “manual” for tricks to do the mental math faster would definitely enrich the experience.

Beware!

Most features are locked. If a kid wants to purchase “Trig Town” the app will attempt to charge $250,000. I’m reporting this to the app store.

neilwest

3 years ago

Response from developer

These are just ways to help add progressiom to the game. Everything aspect of the game is FREE to play. By solving problems you get in game money to then purchase the different towns. This helps players build up so they aren’t overwhelmed . Sorry for the misunderstanding! When developing I thought it might add confusion by making the in game currency represented by $ but I thought this symbol would be easiest to understand. However there is an in app purchase which deletes adds that also uses that symbol but I do add a reminder at the the top this uses real money. Maybe in the future I could add a warning at the beginning of the claim to clarify that. I appreciate you downloading the app and giving it a try!

love the app! however…

i’m a little torn on this. this is an incredibly well made game/app that is not only pretty fun but also looks really aesthetically pleasing. i’m a college student who hates studying, but desperately needs to get better at calculus. i was looking for something that would turn practicing calculus (and math in general) into something more fun. this app is pretty much exactly what i was looking for, which is why i came here to review it. that being said, i just looked over the description again and i just realized that the app store it says it collects location and user data? i assume that’s probably just due to the fact that it’s free, but i’m still a little concerned. i know all apps have some type of tracking so i shouldn’t care but i usually try to avoid ones with several types of data collected. i already love this app a lot so i’ll keep playing it anyways, but i am still a little concerned about it. i wish someone could respond and explain if i’m overthinking it lol. it might just be the fact that ads inherently have trackers on them regardless of the app so idk

gargowl

4 years ago

Response from developer

First off thank you for the response! I did try quite hard to hit the aesthetically pleasing mark. As for your privacy concerns. I totally understand, in fact for those reasons I wanted to keep the amount of data as minimal as possible. However, due to the way ads work they require tracking of user data (which apparently includes location). If it helps, the location it tracks is “coarse location” so it doesn’t have your exact location. You can also turn off tracking in the settings >> one by one >> Allow Tracking (OFF) To give you a brief run down of how the different data is used to hopefully clarify any anxiety: Location: coarse location, used by google fire base and ads. I personally don’t use it anywhere in my code but I can see like what country’s are accessing the app, but not what account is in what country (kind of anonymous) Usage data: I’m Google Firebase I can see analytics on how often and how long my app is played for but again I can’t specifically see how long a certain user is playing. Identifiers: This is just the email that you input and I can look at this since it’s the user base but I CANNOT see your passwords. Overall most of the data gather is used either as analytics/diagnostics on Google Firebase or in ads. But I personally do not do anything malicious with the data. Again thank you for the reply and the concerns!

Great math game, but I have two suggestions!

Long story short, this is one of the best math games I have ever played. You wouldn’t think it would be fun; after all, the problems aren’t disguised at all. However, with the fact that there are “golden” problems that give you artifacts and that there’s a “money” counter that goes up as you solve, it always keeps you coming back for more. I also appreciate the “Battle” Mode. However, I have two suggestions: make the “average time taken on arithmetic/algebra/trig/differential problems” display a “rolling average,” which excludes earlier problems. For example, only consider the times of the last 250 problems or so for the average. Since the point of this app is to get faster and better, a rolling average makes sense since after solving enough problems, it won’t matter how fast or slow you are, your average won’t budge since there’s so much data. It would help measure improvement and trends, showing how far you’ve come instead of reminding you of the past. It would also help refine precision for the battle mode, making sure you’re always being challenged no matter how good you are since you first started. Also, I’m over halfway done with collecting all the artifacts, and it’s worrying me about what I’ll do once I’ve found them all. For me, a big part of the game is the constant waiting for a golden problem. So, instead of having to add more artifacts, why not allow for duplicates once you’ve found them all? These duplicates would show as a simple number in the bottom-left corner of the artifact tile, and every duplicate you get would “upgrade” the artifact, making it more powerful. The boost wouldn’t have to be too big, but it would keep the thrill of golden problems after getting all of the artifacts. (More artifacts would not go unappreciated though.) However, One By One is a great app for anyone looking for a fun and fast way to improve their math skills, and it has problems for all ages: for a five-year old practicing addition, a fourteen-year old brushing up on algebra, or for a high-school student studying for their Trig or differentials final.

Player_1909

4 years ago

Response from developer

Wow. Thank you for such a heartfelt review. I am glad you enjoy the app. I completely agree with changing the average to be more recent. Additionally I think having the artifact upgrades could add another level to the game without too much complexity. I am currently taking a pause of updates but once I get back into I'll definitely add these.

Awesome summer learning tool

My child loves this “game “ and is keeping their skills sharp during the summer

Myducksinarow

4 years ago

Five stars

Best math app ever

paige_paige_paige

4 years ago

I LOVE THIS APP

Saved my grade and is such a game changer!! Highly recommend this app

hmlane

5 years ago

Response from developer

Thank you! That is amazing to hear.

Great Game

Developer knows what he’s doing. I was failing every math class before this app. #bless

molly2059

5 years ago

Response from developer

Thank you for the kind words, I’m glad the app helps!

Great app I just have one suggestion

When doing battles mode the app should automatically clear your answer if you don’t answer in time so you don’t have to spend time on the next answer deleting numbers.

thesciencegod

5 years ago

Response from developer

Thank you for your feedback! Technically it does but what usually happens since the questions changes immediately if you were about to press a number you will press the button right after it changes. To remedy this I think we will either add a small pause between problems or not allow any entries for like .25-.5 seconds after the new problem displays. Edit: Thank you for your feedback, I have now implemented your suggestion!

Great app

This app got me through calc. 🙏🙏🙏

Briceinator 0000

5 years ago

From Dweebus to Math Genius!!!

I was unable to do basic math before I downloaded this app. Now I feel like a human calculator

TimmyG100

5 years ago

Response from developer

That’s great to here

This got me through calc 1

This app got me through calc 1 with flying colors. It is so visually appealing. It makes me want to do math all day everyday. Hoorah

KekeDCMAC

5 years ago

Response from developer

Thank you! Hopefully you’ll get through Calc 2 as well

Absolutely Great!

I found this app very helpful for practicing and expanding on my knowledge of trigonometry. It’s a fun yet effective way to practice your math skills whether you are learning something for the first time or just reviewing.

Aleksey Sanchez

5 years ago

Fast and Fun Math App

I’ve been playing this app for a bit and the game feels really nice. I like the sounds and screen and can’t wait for more updates to expand my skills.

Cbsmiley05

5 years ago

Fun!

Interesting game that has helped me with my quick math skills!

Mediocr

5 years ago

Response from developer

Thank you! I tried to design the game to help with relatively quick mental math.

One By One

One of the most interactive and understandable math arithmetic games I have ever played. The game is increasingly complex as one dives into the rewards system and high level mathematics, giving it an elite level of professionalism. Fun to play, helped me learn. 5 Stars.

Navyday450