iAltair vs Jupiter ACE
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.
Jupiter ACE
Explore the history of computing by learning the Forth programming language on a simulated 1982 home computer. This educational tool provides an authentic experience for aspiring programmers interested in retro technology.
- Forth programming language simulation
- 1982 home computer emulation
- Educational retro computing experience
- Freely available source code
- iPad compatible
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Go back in time and learn to program Forth with this Jupiter ACE on your iPad. The Jupiter ACE was a home computer released back in 1982. While all other home computers at the time used BASIC as the built in programming language, the Jupiter ACE used Forth. This emulator is built with freely available documents and source code. Project files are available on github. Jupiter ACE is trademark of Andrews UK Ltd.
Screenshots
Verdict
The clearest difference is rating: iAltair at 4.8 against Jupiter ACE's 4.0. iAltair also leads on update cadence (every 11 months vs every 63 months) and review sentiment (75% vs 67%). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
iAltair holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 22 and 8 respectively. Written reviews point the same way: 75% of iAltair's written reviews are positive against 67% of Jupiter ACE's.
iAltair ships an update every 11 months, Jupiter ACE every 63 months. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.
| Parameter | iAltair | Jupiter ACE |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (22 ratings) — better | 4.0 (8 ratings) |
| Positive reviews | 75.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 22 — better | 8 |
| Update frequency | Every 11 months — better | Every 63 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Peter Schorn | Memention Holding AB |
Customer experience
iAltair
Jupiter ACE
In-app purchases
iAltair
No in-app purchases
Jupiter ACE
No in-app purchases
