Kello vs WordClock Widget
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kello
This app analyzes the accuracy of mechanical watches by listening to their ticking sounds through your device's microphone. It compares the watch's rhythm to the precise system clock to reveal timekeeping differences. Supports a wide range of watch frequencies and offers guidance on identifying mechanical timepieces.
- Microphone-based watch sound analysis
- Comparison to iOS system clock
- Automatic detection of 8 common watch frequencies
- Guidance on identifying mechanical watches
- Displays timekeeping differences
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Kello analyzes the precision of mechanical watches against the iOS system clock using a microphone. How Kello works: All mechanically regulated watches are designed to start and stop 1000s of times every hour. A portion of the energy used during this starting and stopping motion is released as acoustic energy, resulting in an audible "tick-tock" sound. The regularity of this sound can be measured against the more precise, internal time-signal of iOS devices, such as the iPhone, and the resulting difference in timekeeping is displayed by Kello. Supported Watch Frequencies: Kello can automatically determine the frequency of the watch being measured based on eight of the most common frequencies used in mechanical watches. These frequencies are standard among low-, middle- and high-grade mechanical timepieces and will accommodate the vast majority of mechanical watches produced in the past 100 years. The following frequencies are supported: * 14,400 bph * 16,200 bph * 18,000 bph * 19,800 bph * 21,600 bph * 25,200 bph * 28,800 bph * 36,000 bph Recommended hardware: Kello works best with an external microphone that has an excellent frequency response between 10,000 and 20,000 Hz. How to know if your watch is mechanically regulated: There are four simple ways to determine if your watch is mechanical and can be used with Kello. 1. Look at the text on your timepiece. If the word "quartz" is featured anywhere on the watch, your watch is not mechanical. If the words "automatic" or "shock-proof" are written anywhere on the watch, there is a very high chance that your watch is mechanical and its precision can be measured by Kello. 2. If your watch has a hand that indicates the seconds, observe how frequently it moves. If the hand moves only once every second, it is very likely that your watch is not mechanical. If this hand moves several times per second or appears to sweep along in a smooth, continuous motion, your watch is most likely mechanical and its precision can be measured by Kello. 3. Turn the crown, that is used to set the hands of the watch, while it is pressed fully in. If the crown turns smoothly, your watch is not mechanical. If you can hear a ratcheting sound as you turn the crown, your watch is most likely mechanical and its precision can be measured by Kello. 4. Place the watch close to your ear and listen. If you hear a noise approximately once every second, it is unlikely that your watch is mechanical. If you hear a constant ticking noise, your watch is very likely a mechanical watch and its precision can be measured by Kello.
WordClock Widget
This app transforms your iPhone into an elegant word clock, displaying time in natural language with beautiful typography. It offers over 20 languages, customizable themes, and home screen widgets, including StandBy mode support.
- Word-based time display
- 20+ language support
- Customizable themes
- Home screen widgets
- StandBy mode compatibility
- Real-time updates
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Turn your iPhone into an elegant word clock that displays time in beautiful typography. See the current time expressed in natural language, right on your home screen. BEAUTIFUL TYPOGRAPHY Word Clock transforms the way you see time. Instead of traditional digits, time is displayed as elegant words arranged in a grid. Each minute, the display updates to show the current time in a visually stunning way. MULTIPLE LANGUAGES Choose from 20+ languages including English, German, French, Spanish, Italian, Japanese, Chinese, and more. Each language has its own unique way of expressing time, making Word Clock perfect for language learners and multilingual users. CUSTOMIZABLE THEMES Personalize your clock with beautiful themes. Choose from light, dark, neon, and color-themed options. Each theme features carefully selected colors that make the active words pop while keeping inactive words subtle. HOME SCREEN WIDGET Keep time visible at all times with beautiful home screen widgets. Available in small and large sizes, Word Clock widgets update automatically and blend seamlessly with your home screen design. STAND BY MODE Perfect for nightstand use, Word Clock supports StandBy mode on iPhone. Display time elegantly while your phone charges, creating a beautiful ambient clock for your bedroom. KEY FEATURES • Word-based time display in elegant typography • Support for 20+ languages • Multiple beautiful themes • Home screen widgets (small and large) • StandBy mode support • Real-time updates every minute • Clean, minimalist interface • No ads, no subscriptions PRIVACY FIRST Word Clock doesn't collect any data. Everything runs locally on your device. No tracking, no analytics, no external servers. Whether you're looking for a unique way to display time, want to practice reading time in different languages, or simply appreciate beautiful design, Word Clock brings elegance to your iPhone. Start experiencing time differently today!
Screenshots
Verdict
The clearest difference is rating: WordClock Widget at 4.5 against Kello's 2.8. WordClock Widget also leads on price ($1.99 vs $9.99) and update cadence (weekly vs every 3 months). Kello's advantage is iOS requirement (13.0 vs 17.0). On ratings volume, ads, in-app purchases 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
Kello costs $9.99 and WordClock Widget $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
WordClock Widget holds the better App Store score, 4.5 against 2.8. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 37% of Kello's written reviews are positive against 50% of WordClock Widget's.
Kello ships an update every 3 months, WordClock Widget weekly. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.
| Parameter | Kello | WordClock Widget |
|---|---|---|
| Price | $9.99 | $1.99 — better |
| Rating | 2.8 (5 ratings) | 4.5 (2 ratings) — better |
| Positive reviews | 37.3% of reviews | 50.0% of reviews — better |
| Number of ratings | 5 — better | 2 |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Coldflower Design Corp. | Tobias Weissert |
Customer experience
Kello
WordClock Widget
Bugs and requests
Kello
Reported bugs
10 issues- App crashes on iPhone 5 and iOS 6
- Signal detection fails inconsistently
- Frequency auto-detection varies wildly on same watch
- Unstable signal readings despite strong initial signal
- App hangs on 'determine frequency' step
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- Poor microphone compatibility with external mics
- Results vary significantly between consecutive measurements
- Crashes frequently during measurement process
- Incompatibility with newer iOS versions
- Microphone not detected on some devices
Requested features
10 requests- History log and data storage for watches
- Graphical representation of timing data over time
- Average readings over longer time periods
- Watch profile saving functionality
- Beat error measurement capability
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- Export feature for timing results
- Fine-tuning control for amplification slider
- Improved signal detection algorithm
- Better microphone sensitivity recommendations
- Compatibility with more iOS versions
WordClock Widget
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Kello
No in-app purchases
WordClock Widget
No in-app purchases
Questions
Is Kello free?
Is WordClock Widget free?
Which has better reviews, Kello or WordClock Widget?
Do Kello or WordClock Widget have ads?
Which is updated more often, Kello or WordClock Widget?
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