Comparison

Chronometer vs Countdown

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

Head to head
About

Chronometer

Easily track your watch's accuracy against atomic time. Simply set your watch to atomic time, take a photo of the dial within the app, and record the difference. Analyze daily deviations over 15 days to assess your watch's performance.

Highlights
  • Track daily watch accuracy
  • Compare against atomic time
  • Photo capture for time reading
  • Altitude recording
  • Save data in CSV format
  • Analyze 15-day data trends
Read full description

Chronometer – Mechanical Watch Accuracy This app helps you track the real-world accuracy and long-term rate performance of your mechanical watch. It provides an easy way to measure the daily rate of your watch against an accurate NTP time reference and to follow its performance over days, weeks or months. Before starting a new measurement series, synchronize your watch with an accurate time reference. Do not reset the watch during the measurement period. An internet connection is required to obtain the precise NTP reference time. How to measure your watch 1. Start the app and wait until the NTP server has synchronized. The NTP time turns green when the reference time is available. 2. Point the camera at the watch dial. You can use pinch-to-zoom and, on supported devices, the macro capability for precise reading of the seconds hand. 3. Tap the camera button to freeze the image. The app records the corresponding NTP reference time. 4. Read the exact time from the frozen image and adjust the displayed watch time using the picker wheels. 5. If desired, enter the current altitude above sea level. 6. Tap Save Rate to store the measurement. 7. Tap the camera button again to return to the live camera view. For the best results, measure your watch once per day at approximately the same time. If more than one day passes between two measurements, the app automatically calculates the average daily rate for that interval. Performance evaluation The graph shows the daily rate of your watch together with the standard COSC limits and the more demanding COSC Excellence limits. After at least 15 measurements, the app provides an additional COSC Evaluation based on the most recent 15 daily rate values. The evaluation includes a COSC pass/fail assessment and a Concours Score from 0 to 500 points, derived from the chronometer competition formula. The Concours Score does not include the thermal coefficient (CT). Temperature testing, controlled positional changes, magnetic exposure and shock testing cannot be reproduced during normal everyday use. The result is therefore not an official COSC certification, but a practical evaluation of the real-world rate performance of your watch. The complete measurement history can be exported as a CSV file for further analysis. The exported data includes the date, absolute rate difference, daily rate difference and altitude above sea level. Time reference: Swiss NTP server ntp11.metas.ch The app also includes a COSC NTP 4 Hz reference dial for calibration and verification of optical timing instruments. Requires iOS 18.6 or later.

About

Countdown

Visually track important dates and goals with customizable widgets for your Home Screen and Lock Screen. Set up countdowns and count-ups for personal milestones, habits, or deadlines. Sync across devices and receive timely notifications.

Highlights
  • Home Screen and Lock Screen widgets
  • Count up and down timers
  • Recurrent event tracking
  • Calendar and Reminders synchronization
  • Customizable designs and templates
  • iCloud synchronization
  • Notifications for key dates
Features
Read full description

Track time with beautiful countdown widgets on your Home Screen and Lock Screen. Get the results you want by adding beautiful ALWAYS ON motivational countdowns to the device you use every day. On your wrist? On your Mac? Pretty Progress works there, too. Our objective is to support you achieve your goals. We beautifully track your goals so you don’t have to. What better place to remind yourself of the things that matter than the devices you use every day? Your life goals, your health routines, your personal habits, when your newborn arrives, the deadline of your PhD or your mother’s birthday… No matter what your goal is. Pretty Progress gives you beautiful countdowns with widgets to customize and track them all: - Count up & down towards a specific date or with a timer - Create recurrent events and count the days periodically - Synchronize and import Apple Calendar events and Reminders - Show the percentage of completion, how much time is left or how much time has past (time since). In years, months, weeks, days... or a combination of them - Beautiful and unique designs. 6 different templates to customize and add to your Home Screen, Lock Screen, Stand By (iOS 17), and Watch complications - Customize colors, icons, layout, fonts, size... and every little aspect of the countdown at any time. Create your own personal Home Screen and Watch Face - A dashboard to visualize all the timers and day counters created and understand your deadlines, goals, achievements, or recurrent tasks - Notifications: 1 week and 1 day before, and at the end of your countdown, and every day, week, month or year after your habit streak - A library to get inspired and create widgets easily - 3 different sizes for the Home Screen widgets: small, medium, and large - All Lock Screen widgets localizations available - All complication sizes for Watch Faces supported - Dark mode support - iCloud synchronization. Sync your countdowns on your iPhone, iPad, Apple Watch, and Mac (Silicon) automatically - Family sharing enabled for the PRO purchase WHAT CAN YOU TRACK? - Health routines - Personal habits progress - Countdown to Christmas - Days until your mother's birthday - Countdown to your next holidays - Days until your project release deadline - Days left until your next trip - Percentage of your gym routine complete - Days left until your wedding anniversary - Days until retirement - Days until your financial independence - Percentage of the year, month, week... - Days left until your kombucha is fermented - How many days you have left on your vacations - Countdown to tax submission - Days until your new child arrives - Countdown to that important exam - Days until your graduation - Percentage of the academic year left - Days until Superbowl - My love countdown - Streak of days of habits - Daily, weekly and monthly tasks - Time until your new job WE WOULD LOVE YOUR FEEDBACK: We love to improve, so any feedback is always welcome! For any question, issue, suggestion or anything you want to say, contact at: hi@prettyprogress.app ======================= The free version of Pretty Progress includes four custom countdown widgets with two designs, the default daily, weekly, monthly and yearly progress and some customization options. If you purchase Pretty Progress PRO, the payment will be charged to your iTunes account. If you purchase a monthly or yearly subscription, your account will automatically be charged for renewal within 24 hours prior to the end of the current subscription period unless you disable auto-renew. You can turn off auto-renewal at any time by going to your Account Settings on the App Store after purchase. ======================= Terms of Service: https://prettyprogress.app/terms-of-service Privacy Policy: https://prettyprogress.app/privacy-policy

Screenshots

Chronometer3 screens
Countdown4 screens

Verdict

The call

The clearest difference is review sentiment: Countdown at 82% against Chronometer's 0%. Countdown also leads on price (Free vs $2.99) and rating (4.7 vs 3.1). Chronometer's advantage is in-app purchases (none vs 18). On ads, device support 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

CostPrice · In-app purchases · Ads · Monetization

Countdown is free to download; Chronometer costs $2.99 up front. Countdown sells 14 in-app purchases, starting at $1.99 per month. Chronometer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Countdown holds the better App Store score, 4.7 against 3.1. That said, the two scores are not equally well evidenced: Countdown has 3.1K ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 0% of Chronometer's written reviews are positive against 82% of Countdown's.

UpkeepUpdate frequency

Chronometer ships an update every 5 months, Countdown weekly. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

Scorecard7 real differences · 3 level
Chronometer versus Countdown: the parameters behind the verdict, then further details
ParameterChronometerCountdown
Price$2.99Free — better
Rating3.1 (8 ratings)4.7 (3.1K ratings) — better
Positive reviews0.0% of reviews81.9% of reviews — better
Number of ratings83.1K — better
Update frequencyEvery 5 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS18.618.0 — better
Further details — not scored
Size3 MB183 MB
Age rating4+4+
DeveloperKilian Eiseneggerkeinois OU

Customer experience

Chronometer

All ratings8 ratings
Positive37.5%
Neutral25.0%
Negative37.5%
Written reviews3 reviews
Positive0.0%
Neutral33.3%
Negative66.7%

Countdown

All ratings3,053 ratings
Positive93.2%
Neutral2.5%
Negative4.3%
Written reviews613 reviews
Positive81.9%
Neutral5.5%
Negative12.6%

Bugs and requests

Chronometer

Not enough reviews yet to summarise bugs or requests.

Countdown

Reported bugs

3 issues
  • App crashes on launch for some users
  • Widgets not updating in real-time as expected
  • Countdown data resetting unexpectedly

Requested features

5 requests
  • More customization options for widgets
  • Ability to track non-time-based progress
  • Improved recurring event management
  • Notification/alarm feature when countdown ends
  • Wider range of color and font options

In-app purchases

None

Chronometer

No in-app purchases

14 purchases

Countdown

Subscriptions10
  • Unlimited access7 Days trial$1.991 Month
  • Unlimited access7 Days trial$2.991 Month
  • Pretty Progress PRO (Weekly)$4.997 Days
Show 7 more
  • Pretty Progress PRO (Weekly)3 Days trial$4.997 Days
  • Pretty Progress PRO (Monthly)7 Days trial2 variants$4.991 Month
  • Unlimited access7 Days trial$5.991 Year
  • Unlimited access7 Days trial$8.991 Year
  • Pretty Progress Pro (Annual)7 Days trial3 variants$14.991 Year
  • Pretty Progress Pro (Annual)1 Year trial$24.991 Year
  • Pretty Progress Pro (Annual)$24.991 Year
One-time4
  • Pretty Progress PRO (Lifetime)$29.99
  • Pretty Progress PRO (Lifetime)$34.99
  • Pretty Progress PRO (Lifetime)2 variants$49.99
Show 1 more
  • Pretty Progress PRO (Lifetime)$59.99

Questions

Is Chronometer free?
Chronometer costs $2.99, with no in-app purchases.
Is Countdown free?
Countdown is free to download, with in-app purchases available.
Which has better reviews, Chronometer or Countdown?
Countdown is rated higher. Chronometer averages 3.1 out of 5 from 8 ratings, while Countdown averages 4.7 from 3.1K ratings.
Do Chronometer or Countdown have ads?
Neither Chronometer nor Countdown shows ads.
Which is updated more often, Chronometer or Countdown?
Chronometer ships an update every 5 months, and Countdown weekly. Most recently, Chronometer was updated on October 8, 2026 and Countdown on October 13, 2026.

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