Defrost Pro vs Z80CPM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Defrost Pro
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Some Mac Pro (late 2013) users complain that their screen freezes sporadically. Sometimes several times a day. Other times this does not happen for several weeks. If your Mac Pro (or other Mac) suffers from screen freezes while the rest of the system is still running (sound is still being played and the cursor keeps moving and changing according to the underlying but frozen GUI), Defrost Pro can help you restart or shutdown your Mac. Just select the device that is having the problem from the list of devices in your current network and press restart. This will not save any unsaved file for you. But it will prevent having to hard shutdown the device and potentially causing any harm to the hardware or file system. Defrost Pro does not need to connect to the internet, but it must be connected to the same local network as the Mac to be restarted. Defrost Pro can only restart Macs running macOS. Nonetheless Defrost Pro will list all the devices in the local network. You need to know the ip address or the devices name to select the correct Mac. Requirements: - You will need to enter the device's admin name and password. Usually if there is only one user on the device that will be the admin. - The Mac to be restarted needs to have Remote Login activated so Defrost Pro can login and tell your Mac to restart. Activation can be done in the System Preferences under Sharing.
Z80CPM
Experience the classic CP/M operating system on your iOS or Mac device with a full Z80 processor emulator. Run authentic CP/M software, including operating systems, word processors, programming languages, and text adventures. Works offline with support for multiple disk images.
- Full Z80 emulation
- VT100 terminal support
- Multiple disk image mounting
- Offline functionality
- Native Mac support
- Downloadable CP/M disk images
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RomWBW CP/M brings the classic CP/M operating system to your iPhone, iPad, and Mac with a full Z80 processor emulator. FEATURES • Full Z80 Emulation - Accurate instruction emulation runs authentic CP/M software • VT100 Terminal - ANSI escape sequence support for text adventures and productivity apps • Multiple Disk Support - Mount up to 4 disk images simultaneously • Download Disk Images - Fetch CP/M disk images directly from the RomWBW project • Works Offline - Downloaded disk images are stored locally • Native Mac Support - Runs natively on macOS via Mac Catalyst CLASSIC SOFTWARE Run the software that defined personal computing: • Operating Systems: CP/M 2.2, CP/M 3, ZSDOS, NZCOM, ZPM3 • Word Processing: WordStar • Programming: Turbo Pascal, Microsoft BASIC • Text Adventures: Zork, Adventure, Hitchhiker's Guide to the Galaxy • Databases: dBASE II • And thousands more CP/M programs GETTING STARTED 1. Open Settings and download a disk image (CP/M 2.2 recommended) 2. Select the disk image for Unit 0 3. Press Play to start the emulator 4. Press 0 at the boot menu to boot from disk BUILT ON ROMWBW This emulator is built on the RomWBW HBIOS platform, the same firmware used by real retro Z80 hardware projects. Disk images are downloaded from the official RomWBW project and include freely distributable CP/M software. TECHNICAL DETAILS • 80x25 character terminal display • hd1k disk format (8MB per slice, 64MB per disk) • Hardware keyboard support • Portrait and landscape orientation Perfect for retrocomputing enthusiasts, computer history education, or anyone who wants to experience the operating system that launched the personal computer revolution.
Screenshots
Verdict
The clearest difference is update cadence: Z80CPM at every 10 days against Defrost Pro's every 2 months. Z80CPM also leads on device support (4 vs 2). Defrost Pro's advantage is iOS requirement (10.0 vs 15.0). On price, 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.
Defrost Pro ships an update every 2 months, Z80CPM every 10 days. The most recent releases landed on October 26, 2026 and November 2, 2026 respectively.
| Parameter | Defrost Pro | Z80CPM |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 19 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Enie Weiss | Aaron Wohl |
In-app purchases
Defrost Pro
No in-app purchases
Z80CPM
No in-app purchases









