iAltair vs e
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iAltair
Experience vintage computing with a simulation of the MITS Altair 8800. Explore old software like CP/M 2 and run programs such as Eliza using built-in BASIC. This self-contained system offers a unique glimpse into early computing history.
- MITS Altair 8800 simulation
- CP/M 2 operating system support
- Built-in BASIC interpreter
- Run Eliza program
- Self-contained system
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iAltair pretends to be a MITS Altair 8800 computer. It allows you to get the feeling of really old software such as the CP/M 2 operating system. The system is fully self contained and does not allow you to remotely add any code but you can try out Basic to run Eliza.
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.
Screenshots
Verdict
The clearest difference is ratings volume: iAltair at 21 against e's 1. e's advantage is review sentiment (90% vs 75%) and rating (5.0 vs 4.8). On price, update cadence, 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
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 4.8. That said, the two scores are not equally well evidenced: iAltair has 21 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of iAltair's written reviews are positive against 90% of e's.
Both ship on a similar rhythm, roughly every 11 months. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.
| Parameter | iAltair | e |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (21 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 75.0% of reviews | 90.0% of reviews — better |
| Number of ratings | 21 — better | 1 |
| Update frequency | Every 11 months | Every 11 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.4 — better | 15.5 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Peter Schorn | Elliptics, Ltd. |
Customer experience
iAltair
e
In-app purchases
iAltair
No in-app purchases
e
No in-app purchases








