Comparison

OpenDisplay vs K37 Simple Projects

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

K37 Simple Projects

Features
Read full description

Simple Projects helps you turn plans into progress without the clutter. Create focused projects, add the next tasks that matter, and see what needs attention today. Choose a distinctive icon, color, and cultural theme to make the app feel like yours. FEATURES • Create, edit, complete, and archive projects • Add prioritized tasks with notes and optional deadlines • See overdue, due-today, upcoming, and unscheduled work • Search projects and tasks quickly • Personalize projects with icons and colors • Choose from 17 visual themes • Keep your data on your device • No account and no subscription Use up to three active projects with five open tasks in each project for free. A one-time Full Version purchase unlocks unlimited active projects and unlimited open tasks. All other app features remain included in the free version. No subscription is required. Simple Projects is designed by K37 Software for people who want a calm, straightforward way to organize the plans that matter.

Screenshots

OpenDisplay1 screens
K37 Simple Projects3 screens

Verdict

The call

The clearest difference is in-app purchases: OpenDisplay at none against K37 Simple Projects's 1. OpenDisplay also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. K37 Simple Projects sells 1 one-off in-app purchase. OpenDisplay asks for nothing beyond the download.

UpkeepUpdate frequency

OpenDisplay ships an update every 8 days, K37 Simple Projects every 6 days. The most recent releases landed on October 14, 2026 and September 30, 2026 respectively.

Scorecard2 real differences · 8 level
OpenDisplay versus K37 Simple Projects: the parameters behind the verdict, then further details
ParameterOpenDisplayK37 Simple Projects
PriceFreeFree
Rating4.9 (14 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings14 — better—
Update frequencyEvery 8 daysEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size1 MB6 MB
Age rating4+4+
DeveloperPhilip PoloczekK37 Software LLC

In-app purchases

None

OpenDisplay

No in-app purchases

1 purchases

K37 Simple Projects

One-time1
  • Simple Projects Full$2.99

Questions

Is OpenDisplay free?
OpenDisplay is free to download, with no in-app purchases.
Is K37 Simple Projects free?
K37 Simple Projects is free to download, with in-app purchases available.
Do OpenDisplay or K37 Simple Projects have ads?
Neither OpenDisplay nor K37 Simple Projects shows ads.
Which is updated more often, OpenDisplay or K37 Simple Projects?
OpenDisplay ships an update every 8 days, and K37 Simple Projects every 6 days. Most recently, OpenDisplay was updated on October 14, 2026 and K37 Simple Projects on September 30, 2026.

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