Comparison

iAltair vs e

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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.

About

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.

Highlights
  • 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

iAltair4 screens
e4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 11 months. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.

Scorecard3 real differences · 7 level
iAltair versus e: the parameters behind the verdict, then further details
ParameteriAltaire
PriceFreeFree
Rating4.8 (21 ratings)5.0 (1 ratings) — better
Positive reviews75.0% of reviews90.0% of reviews — better
Number of ratings21 — better1
Update frequencyEvery 11 monthsEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.4 — better15.5
Further details — not scored
Size10 MB4 MB
Age rating4+4+
DeveloperPeter SchornElliptics, Ltd.

Customer experience

iAltair

All ratings21 ratings
Positive95.2%
Neutral4.8%
Negative0.0%
Written reviews12 reviews
Positive75.0%
Neutral16.7%
Negative8.3%

e

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive90.0%
Neutral0.0%
Negative10.0%

In-app purchases

None

iAltair

No in-app purchases

None

e

No in-app purchases

Questions

Is iAltair free?
iAltair is free to download, with no in-app purchases.
Is e free?
e is free to download, with no in-app purchases.
Which has better reviews, iAltair or e?
e is rated higher. iAltair averages 4.8 out of 5 from 21 ratings, while e averages 5.0 from 1 ratings.
Do iAltair or e have ads?
Neither iAltair nor e shows ads.
Which is updated more often, iAltair or e?
iAltair ships an update every 11 months, and e every 11 months. Most recently, iAltair was updated on October 13, 2026 and e on October 5, 2026.

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