e vs Linear Algebra Pro
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.
Linear Algebra Pro
This app provides step-by-step calculations and detailed solutions for matrix and vector operations. It's designed for students and professionals needing to solve linear algebra problems quickly and understand the underlying math.
- Matrix operations (addition, subtraction, multiplication)
- Determinant calculations (Sarrus, Laplace methods)
- Vector operations (addition, subtraction, scalar/vector product)
- Step-by-step solutions with formulas
- Theoretical overviews for concepts
- Random number generator for practice problems
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Linear Algebra Pro is a powerful and easy-to-use tool for calculating matrices, determinants, and vector operations — perfect for students, engineers, and anyone who works with linear algebra in study or professional tasks. The app performs step-by-step calculations with detailed solutions using the correct formulas. You can work with matrices up to 5×5 and vectors in 2D or 3D. Each calculator includes a brief theoretical overview to help you understand the concept behind the operation. It also includes a random number generator to instantly create practice problems with random values. Available in 8 languages: English, French, German, Italian, Portuguese, Spanish, Russian, Ukrainian. Whether you're learning, teaching, or solving real-world problems, Linear Algebra Pro helps you get accurate results quickly and understand the math behind them. The application perform following operations with matrices: • Matrix addition • Matrix subtraction • Matrix scalar multiplication • Matrix square • Matrix multiplication • Matrix transposition Determinant calculations: • Calculation of the determinant using the Sarrus method • Calculation of the determinant using the Laplace method Vector operations: • Vector Length • Vector coordinates by two points • Vectors addition • Vectors subtraction • Scalar and vector multiplication • Scalar product of vectors • Cross product of vectors • Mixed (scalar) triple product • Angle between two vectors • Projection of a vector onto another vector • Direction cosines • Collinear vectors • Orthogonal vectors • Coplanar vectors • Area of triangle formed by vectors • Area of a parallelogram formed by vectors • Volume of pyramid formed by vectors • Volume of a parallelepiped formed by vectors Download now and simplify your linear algebra work!
Screenshots
Verdict
The clearest difference is price: e at Free against Linear Algebra Pro's $4.99. Linear Algebra Pro's advantage is update cadence (every 4 months vs every 11 months) and review sentiment (100% vs 90%). On rating, ratings volume, ads and in-app purchases 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
e is free to download; Linear Algebra Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for e against 5.0 for Linear Algebra Pro. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 90% of e's written reviews are positive against 100% of Linear Algebra Pro's.
e ships an update every 11 months, Linear Algebra Pro every 4 months. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.
| Parameter | e | Linear Algebra Pro |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 90.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 1 |
| Update frequency | Every 11 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.5 — better | 16.0 |
| Further details — not scored | ||
| Size | 4 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Elliptics, Ltd. | ALG Software Lab |
Customer experience
e
Linear Algebra Pro
In-app purchases
e
No in-app purchases
Linear Algebra Pro
No in-app purchases









