A Mod vs OpenDisplay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A Mod
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The modulation depth is calculated by inputting the amplitude value measured with an oscilloscope, etc.
OpenDisplay
Transform your iPhone or iPad into a genuine second display for your Mac. This open-source solution allows you to extend your screen space, keeping essential apps visible. Connect via USB for minimal latency or Wi-Fi for easy setup.
- Use iPhone/iPad as a second Mac display
- Connect via USB or Wi-Fi
- Retina-sharp rendering
- Touch and scroll support
- Portrait or landscape orientation
- Private by design, no tracking
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OpenDisplay turns your iPhone or iPad into a second display for your Mac. It's the open-source way to put your spare Apple device to work as a real extended monitor — drag windows onto it, keep chat, notes, or logs in view, and gain screen space anywhere you go. It's not a mirror: it's a genuine additional display your Mac treats like any other monitor. • Real extended display — arrange it in your Mac's Display settings and drag windows across • Connect over USB for the lowest latency, or over Wi-Fi with zero setup • Retina-sharp, pixel-for-pixel rendering • Touch and scroll — tap, drag, and two-finger scroll to control your Mac • Works in portrait or landscape • Private by design — a direct connection between your own devices, with no accounts, no servers, and no tracking IMPORTANT: OpenDisplay requires the companion OpenDisplay app for Mac, running on your computer on the same cable or Wi-Fi network. Get it at https://peetzweg.github.io/opendisplay — without it, this app has nothing to connect to. OpenDisplay is open source under the GPL-3.0 license. Read the code, report issues, or contribute at https://github.com/peetzweg/opendisplay
Screenshots
Verdict
The clearest difference is update cadence: OpenDisplay at every 8 days against A Mod's every 3 weeks. OpenDisplay also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement 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.
A Mod ships an update every 3 weeks, OpenDisplay every 8 days. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.
| Parameter | A Mod | OpenDisplay |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.9 (14 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 14 — better |
| Update frequency | Every 3 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Takeshi Ono | Philip Poloczek |
In-app purchases
A Mod
No in-app purchases
OpenDisplay
No in-app purchases
