e vs Basic Math
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
e
Explore the universe of spacetime by converting lengths into time and vice versa. This unique calculator uses geometrized units to help you think about the world in new ways and amuse your friends. It's a fun tool for science enthusiasts and students alike.
- Convert length to time
- Convert time to length
- Geometrized units (c=1)
- Avoids scientific notation
- Supports various input units
- Educational and entertaining
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Have you thought about how old you are - in meters? Or how tall you are - in seconds? Or how many miles it is until your next birthday? Let's think out of the box, relativistically. While spacetime intervals are constant, length and time can be converted to each other. This calculator makes use of geometrized units (where the speed of light is unity) and lets you convert conveniently between length and time. Is this a useful conversion tool in your day-to-day life? Probably not. But maybe it will let you think about the world a little differently. And amuse your friends and family at the same time! For a technical reference, refer to "Gravitation", by Misner, Thorne and Wheeler, 1973, W.H. Freeman and Company, pp. 35-36. To make things more accessible to the average user, we have tried to avoid displaying scientific notation in numbers as much as possible and, instead, make use of more common terms, such as "billions of miles" and "milliseconds". Now upgraded with the ability to choose different lengths and times for input (inches, hours, days, etc.)! keywords: science, physics, space, time, relativity, calculator ---------------- Reviews from around the world: from Fox Knight, US Love this app!! from highschool student, US Good job, there's a lot of potential here. . . from Turbo elf, US Science geek must buy from Letter Warrior, US I love this idea, especially seeing how far it is until tomorrow, or a friend's birthday. from Professor and wife, US A great application that can also be used by students ... really is a wonderful game.
Basic Math
Practice essential math skills through repetitive exercises. This app offers addition, subtraction, multiplication, and division problems suitable for children and adults. An optional upgrade unlocks advanced features like a numeric keypad, customizable difficulty, and performance tracking.
- Addition exercises
- Subtraction exercises
- Multiplication exercises
- Division exercises
- Adjustable difficulty
- Performance reporting
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This is an application based on the drill-and-practice instructional strategy. Similar to memorization, such a strategy presents the tasks to be completed repetitively to build up the foundation skills for more meaningful learning in the future. This application provides exercises covering basic mathematical skills like addition, subtraction, multiplication and division. The exercises are targeted for children under 12 years, and sometimes even adults, with varying degrees of difficulty depending on their age. Upgrade to Basic Math Deluxe to unlock the following features: - A numeric keypad to enter answers, besides using multiple-choice answers - Enter values using the usual calculator left-to-right mode, or working style right-to-left mode - Sound effects - A times table to practise multiplication tables - Option to configure max and minimum operand value - A report card to review your performance in past exercises
Screenshots
Verdict
The clearest difference is rating: e at 5.0 against Basic Math's 3.0. e also leads on ads (none vs shown) and review sentiment (90% vs 64%). Basic Math's advantage is update cadence (every 2 months vs every 11 months). On price, ratings volume, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
e holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 90% of e's written reviews are positive against 64% of Basic Math's.
e ships an update every 11 months, Basic Math every 2 months. The most recent releases landed on October 5, 2026 and September 29, 2026 respectively.
| Parameter | e | Basic Math |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 90.0% of reviews — better | 63.9% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 11 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.5 — better | 26.0 |
| Further details — not scored | ||
| Size | 4 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Elliptics, Ltd. | Explorer Technologies |
Customer experience
e
Basic Math
Bugs and requests
e
Not enough reviews yet to summarise bugs or requests.
Basic Math
Reported bugs
4 issues- Application abruptly stops when checking Report Card
- Tic Tac Toe mode instantly presumes two players
- Timer only counts up and not down
- Requires iOS 4, not compatible with older devices
Requested features
11 requests- Offer percents
- Allow adjustment of problems per session
- Option to change Tic Tac Toe mode to single player
- Explain why questions were missed
- Make timer count down
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- Add more operations
- Add percentages and angles
- Option to type in own answers instead of multiple choice
- Make problems go faster
- Change settings for difficulty and speed
- Add grammar, science, and music modules
In-app purchases
e
No in-app purchases
Basic Math
No in-app purchases
