Moon Atlas vs Z80 Reference
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Moon Atlas
Explore a detailed 3D model of the Moon with interactive controls. Discover named features, spacecraft landing sites, and real-time lunar phase and libration data. Customize your view for different observational needs.
- Interactive 3D Moon globe
- Feature identification and search
- Real-time Moon phase and libration
- Customizable globe orientation
- Spacecraft landing site information
- Detailed feature database
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Explore a 3D globe of the Moon Moon Atlas is an astronomy application that lets you use pinch and finger gestures to manipulate a 3D globe of the Moon. This is a rendered sphere and not a static map image. As you zoom in more labels appear as finer detail comes into view. You can double tap on the labels to get more information about a particular feature. Moon Atlas displays the phase and libration of the Moon from your chosen location and renders these on the globe. You can switch to a 'Globe' mode that allows you to spin the Moon around to see far side features. The feature database is searchable and can move the globe to a searched feature. The phase can be switched off and the far side is shown in a slightly darker shade of grey. Date, time and location can be changed. There is also a realtime mode that will update to the current time. The Moon globe can be shown with north or south at the top or inverted to suit different telescope views. Over 1800 named features are included as well as 26 spacecraft that reached the surface of the Moon. In addition, information about the current Moon phase and libration are provided. You can swipe left and right on the phase view to go backwards and forwards a day and on the libration chart to go backwards and forwards a month. Mars, Mercury, Venus, Jupiter and Saturn atlases are also available on the App Store! Also there is Planisphere, a star charting app, available on the App Store!
Z80 Reference
Access a comprehensive Zilog Z80 opcode reference with a user-friendly interface. View detailed command overviews, categorized and color-coded, with fully documented sample code for each opcode. Designed for ease of use and visual appeal, it's an ideal companion for Z80 programming.
- Complete Z80 opcode list
- Color-coded by category
- Detailed command overview
- Fully documented sample code
- Easy-to-use interface
- Elegant design
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This reference application provides access to every single Z80 opCode in a convenient scrolling list, colour-coded by category. Selecting an opCode provides a full overview of the command, together with fully documented sample code. Simple We've spent a long time creating an interface that is wonderfully easy to use. Z80 opCodes are selected by scrolling through a simple list of all available commands and selecting using your finger. Once selected you have access to all the information you could need. Elegant The subtle styling of Z80 Reference has been designed to be easy on the eye, whether read during the day or at night. Having the reference available by your side whilst programs are written on your full-screen PC. Educational Z80 Reference is the ultimate companion to anyone that is looking to create programs based on the Zilog Z80 processor. Every aspect of each opCode is covered in detail, with particular attention paid to delivering useful example source code.
Screenshots
Verdict
The clearest difference is price: Z80 Reference at Free against Moon Atlas's $5.99. Z80 Reference also leads on rating (5.0 vs 4.0) and update cadence (every 3 days vs every 3 months). On ratings volume, ads, in-app purchases and monetization model 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
Z80 Reference is free to download; Moon Atlas costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Z80 Reference holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews point the same way: 72% of Moon Atlas's written reviews are positive against 100% of Z80 Reference's.
Moon Atlas ships an update every 3 months, Z80 Reference every 3 days. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.
| Parameter | Moon Atlas | Z80 Reference |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 4.0 (6 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 72.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 6 — better | 3 |
| Update frequency | Every 3 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 12.1 — better |
| Further details — not scored | ||
| Size | 740 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Julian James | Sgc Marketing Ltd |
Customer experience
Moon Atlas
Z80 Reference
In-app purchases
Moon Atlas
No in-app purchases
Z80 Reference
No in-app purchases




