Comparison

Flip Timer & stopwatch vs Open Citadel

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

Head to head
About

Flip Timer & stopwatch

This app offers a full-screen digital timer with a unique flip animation to visualize time progression. It also includes a stopwatch for tracking activities like workouts, study sessions, and work. Customize reminder sounds and background audio for an immersive experience.

Highlights
  • Full-screen digital timer
  • Flip animation for time visualization
  • Countdown timer
  • Stopwatch functionality
  • Customizable reminder sounds
  • Background sound options
  • Keep screen on for progress viewing
Features
Read full description

Flip Timer, A full-screen digital timer. Countdown, flip animation allows you to feel the passage of time; Stopwatch, record your sport, fitness, work, study and so on. - Swipe up or slide down to set the countdown duration - you can set up timed reminder sound - Focus on the work, you can set the background sound, so you immersed them. - Keep the screen on, You can view the progress of time at any time

About

Open Citadel

Features
Read full description

A book only changes you when you act on it. Most reading apps end when you close the book. Open Citadel starts there. It is your citadel of knowledge and self-development: one Library for the books, podcasts and blogs you learn from, and a way to act on what you learn. One Library for everything you learn from Books, podcasts and blogs sit side by side. Move between them in one tap. Free books from Project Gutenberg Browse Gutenberg's shelves, search its catalogue, and download books in the public domain in the United States. Readers outside the US should check the law where they live before they read. Podcasts you can finish Follow shows, search podcast charts and directories, and download episodes. The player has speed control, a sleep timer, chapters and show notes with seekable timestamps. Import your AntennaPod library and keep your place in every episode. Blogs, read in the reader Follow a blog by its feed or web address, or choose from a curated directory. Each post opens in the reader, so you can highlight it, tag it and talk it through with Samwell, just as you would a book. Highlight it. Keep it. Use it. Every highlight, note and tag is saved to your Timeline, a dated record of what you have learned. Samwell, your reading companion Samwell helps you set up your Library, talks through what you read, and turns what you want to change into a goal made of small steps. He checks in using your logs and highlights, so his advice is about your life, not someone else's. On-device Samwell runs on your phone, so he works without a connection. Compass counts consistency, not streaks Log a few minutes a day. Compass measures how often you show up, so one missed day never wipes out the rest. The whole cycle, in one app Read. Highlight. Set a goal. Log it. When the goal ends, Samwell writes down what it taught you, so the next one starts smarter. We assume you can decide what matters. Open Citadel helps you act on it. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.open-citadel.online/privacy

Screenshots

Flip Timer & stopwatch4 screens
Open Citadel4 screens

Verdict

The call

The clearest difference is in-app purchases: Open Citadel at none against Flip Timer & stopwatch's 3. Open Citadel also leads on ads (none vs shown) and update cadence (fortnightly vs every 3 months). Flip Timer & stopwatch's advantage is iOS requirement (15.0 vs 17.0). On price 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 Timer & stopwatch sells 3 one-off in-app purchases. Open Citadel asks for nothing beyond the download.

UpkeepUpdate frequency

Flip Timer & stopwatch ships an update every 3 months, Open Citadel fortnightly. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 6 level
Flip Timer & stopwatch versus Open Citadel: the parameters behind the verdict, then further details
ParameterFlip Timer & stopwatchOpen Citadel
PriceFreeFree
Rating4.6 (7.6K ratings) — better—
Positive reviews68.6% of reviews—
Number of ratings7.6K — better—
Update frequencyEvery 3 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size46 MB95 MB
Age rating4+4+
Developer俐 马Thamsanqa Ncube

Bugs and requests

Flip Timer & stopwatch

Reported bugs

3 issues
  • Timer randomly stops counting down
  • Unable to stop/reset timer once started
  • Ads prevent user from interacting with timer

Requested features

4 requests
  • Add option to set timer in hours/minutes/seconds
  • Implement repeat/loop functionality for timer
  • Allow custom alarm/notification sounds
  • Improve landscape mode support

Open Citadel

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Flip Timer & stopwatch

One-time3
  • Remove Ads$0.99
  • All the skins$0.99
  • Pro Version$1.99
None

Open Citadel

No in-app purchases

Questions

Is Flip Timer & stopwatch free?
Flip Timer & stopwatch is free to download, with in-app purchases available.
Is Open Citadel free?
Open Citadel is free to download, with no in-app purchases.
Do Flip Timer & stopwatch or Open Citadel have ads?
Flip Timer & stopwatch shows ads; Open Citadel does not.
Which is updated more often, Flip Timer & stopwatch or Open Citadel?
Flip Timer & stopwatch ships an update every 3 months, and Open Citadel fortnightly. Most recently, Flip Timer & stopwatch was updated on October 24, 2026 and Open Citadel on October 20, 2026.

Other comparisons