Comparison

NN Clock vs Flip Clock 3D

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

Head to head
About

NN Clock

This application offers a straightforward and powerful alarm clock experience with an elegant analog interface. It simplifies alarm setting and management, allowing for custom wake-up sounds and background changes. The app also integrates with HealthKit for sleep tracking.

Highlights
  • Set alarms by moving alarm hand
  • Swipe to dismiss alarms
  • Start timer by turning ring
  • Customizable background images
  • HealthKit sleep registration
  • 8 built-in alarm sounds
  • Music library integration
Features
Read full description

The No Nonsense Alarm Clock was made to be simple and easy to use, yet powerful and flexible. What is does, it does good: "Perfect minimal analog clock I'm a huge fan of analog clocks with good alarms for iPhone and this one is in my top 5. I currently have 23 ( just counted) and many aren't clean, simple and just good, this is a keeper. "Awesomely Simplistic This app has an elegant watch interface and simply and dependably does what it's supposed to. More wake-up tones would be welcome, but adding to this app might defeat its appeal. Highly recommended! ... The longer I have had this app, the better it gets. Very intuitive and increasingly feature-rich I have discovered." "KISS Approach - it just works Well, this application is such a find. It keeps everything at the most basic level and in doing so it is pure genius. Couldn't ask for anything more even though it is so "less" than what the other apps try to promise" "Simple, works, looks great. I'm embarrassed to say how much I've spent buying alarm clock apps. This is by far the best one, and it is free. It just works. Looks great, easy to set the alarm or multiple alarms. Enormous snooze button. Very well done!" Key features: - Set an alarm by simply moving the alarm hand - Choose between 3 alarms and alarm-off by swiping the alarm window - Start a timer/countdown by turning the ring - Change background images (new) - Register sleep in HealthKit When the alarm goes off you don't have to choose between two buttons - there is only one: Snooze. The alarm sound can be chosen from 8 different build-in alarms, which all work even when the app is in the background or the device is suspended. When the app is in the foreground it can play any song you select from your Music library - slowly fading in if you choose. The brightness of the screen is easily adjusted by sliding two fingers up or down the main view. The Alarm Clock looks great on your night stand.

About

Flip Clock 3D

Enhance your workspace with a realistic 3D mechanical flip clock. This app helps improve focus and productivity during work or study sessions by providing a clear time display. Customize with various fonts and themes, and utilize the alarm feature when the app is active.

Highlights
  • Vivid 3D mechanical components
  • Adjustable viewing angles
  • 12/24 hour mode switching
  • Multiple font and theme options
  • Foreground alarm functionality
Features
Read full description

This app uses high quality 3D models to bring beautiful machanical style flip clock to your screen. Put it on your desk, you can easily track time. When you're working or studying, it's great to improve your productivity and help you get focus. Key features: # vivid 3D machanic components and gears # you can view the clock at different angles # switch between 12 hour or 24 hour mode # multiple fonts and themes # alarm functionality (works only when app is in foreground)

Screenshots

NN Clock4 screens
Flip Clock 3D4 screens

Verdict

The call

The clearest difference is rating: Flip Clock 3D at 4.8 against NN Clock's 3.8. Flip Clock 3D also leads on update cadence (weekly vs every 6 months) and review sentiment (100% vs 77%). NN Clock's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume 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. Flip Clock 3D sells 1 one-off in-app purchase. NN Clock asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Flip Clock 3D holds the better App Store score, 4.8 against 3.8. Both are backed by a comparable volume of ratings — 36 and 25 respectively. Written reviews point the same way: 77% of NN Clock's written reviews are positive against 100% of Flip Clock 3D's.

UpkeepUpdate frequency

NN Clock ships an update every 6 months, Flip Clock 3D weekly. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

Scorecard7 real differences · 3 level
NN Clock versus Flip Clock 3D: the parameters behind the verdict, then further details
ParameterNN ClockFlip Clock 3D
PriceFreeFree
Rating3.8 (36 ratings)4.8 (25 ratings) — better
Positive reviews76.7% of reviews100.0% of reviews — better
Number of ratings36 — better25
Update frequencyEvery 6 monthsWeekly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS6.0 — better12.0
Further details — not scored
Size7 MB206 MB
Age rating4+4+
DeveloperJon Juhl Nørrelykke乃君 黄

Customer experience

NN Clock

All ratings36 ratings
Positive61.1%
Neutral13.9%
Negative25.0%
Written reviews43 reviews
Positive76.7%
Neutral7.0%
Negative16.3%

Flip Clock 3D

All ratings24 ratings
Positive95.8%
Neutral0.0%
Negative4.2%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

NN Clock

Reported bugs

7 issues
  • Setting background images doesn’t work - no OK or apply button
  • Error message saying alarm could not be set
  • Cannot set background, app hangs on cropping screen
  • Green needle does not align perfectly with white marks
  • App dims out in the middle of the night
Show 2 more
  • Songs from iTunes library don't play
  • Alarm only works when phone is unlocked and in the app

Requested features

11 requests
  • Update app to fix background image setting
  • Fix green needle alignment issue
  • Add multiple alarms at the same time
  • Add snooze button functionality
  • Add repeating days option for alarms
Show 6 more
  • Include vibration option
  • Option to leave screen on all night
  • More watch face choices
  • Color selection for clock display
  • Option to disable snooze
  • More wake-up tones

Flip Clock 3D

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

NN Clock

No in-app purchases

1 purchases

Flip Clock 3D

One-time1
  • Unlock all contents$1.99

Questions

Is NN Clock free?
NN Clock is free to download, with no in-app purchases.
Is Flip Clock 3D free?
Flip Clock 3D is free to download, with in-app purchases available.
Which has better reviews, NN Clock or Flip Clock 3D?
Flip Clock 3D is rated higher. NN Clock averages 3.8 out of 5 from 36 ratings, while Flip Clock 3D averages 4.8 from 25 ratings.
Do NN Clock or Flip Clock 3D have ads?
Flip Clock 3D shows ads; NN Clock does not.
Which is updated more often, NN Clock or Flip Clock 3D?
NN Clock ships an update every 6 months, and Flip Clock 3D weekly. Most recently, NN Clock was updated on November 6, 2026 and Flip Clock 3D on November 4, 2026.

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