# iAltair vs Jupiter ACE

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.

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.

## The numbers

| Metric | iAltair | Jupiter ACE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (22 ratings)](https://appshunter.io/ios/app/ialtair/id291182085/reviews)** | [4.0 (8 ratings)](https://appshunter.io/ios/app/jupiter-ace/id590389822/reviews) |
| Number of ratings | **22** | 8 |
| Positive reviews | **75.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 months** | Every 63 months |
| Monetization | Free | Free |
| Size | 10 MB | 35 MB |
| Requires iOS | 15.4 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Peter Schorn](https://appshunter.io/developer/291182088) | [Memention Holding AB](https://appshunter.io/developer/286367873) |

## What reviewers say

### iAltair

[App page](https://appshunter.io/ios/app/ialtair/id291182085)

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

**In-app purchases:** none


### Jupiter ACE

[App page](https://appshunter.io/ios/app/jupiter-ace/id590389822)

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.

**Highlights:** Forth programming language simulation, 1982 home computer emulation, Educational retro computing experience, Freely available source code, iPad compatible

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iAltair free?

iAltair is free to download, with no in-app purchases.

### Is Jupiter ACE free?

Jupiter ACE is free to download, with no in-app purchases.

### Which has better reviews, iAltair or Jupiter ACE?

iAltair is rated higher. iAltair averages 4.8 out of 5 from 22 ratings, while Jupiter ACE averages 4.0 from 8 ratings.

### Do iAltair or Jupiter ACE have ads?

Neither iAltair nor Jupiter ACE shows ads.

### Which is updated more often, iAltair or Jupiter ACE?

iAltair ships an update every 11 months, and Jupiter ACE every 63 months. Most recently, iAltair was updated on October 31, 2026 and Jupiter ACE on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*