Comparison

Emerald Chronometer vs Precise Timestamp

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

Head to head
About

Emerald Chronometer

Experience highly detailed mechanical watch faces with advanced astronomical and clock complications. Track celestial events, manage time with precision, and explore historical and future dates with interactive displays. Optimized for iPhone and iPod touch.

Highlights
  • Accurate astronomical data (4000 BCE - 2800 CE)
  • Sun, Moon, and planet rise/set times
  • Mechanical display of Moon phases
  • Precise local and UTC time
  • Chronograph with split timer
  • World-time and calendar watches
  • Interactive time-travel simulation
Read full description

These models of high-end mechanical watch faces contain many of the most complex "complications" found in real watches, plus refinements found nowhere else. All displays maintain the look and feel of real mechanical objects, but with the time and location accuracy of the iPhone. NOTE: This app (Emerald Chronometer) is optimized for the iPhone and iPod touch. Please also see Emerald Chronometer HD, a separate product optimized for the iPad. Astronomy features: - Highly accurate data from 4000 BCE to 2800 CE - Times of rise and set for the Sun, the Moon, and the 5 classical planets - The correct shape and orientation of the Moon in all phases but still using a mechanical display - Relative positions of the Sun, Moon, 6 planets and the constellations of the zodiac - "Compass functions" show the elevation and azimuth of the Sun, the Moon, and the 5 planets - The Equation of Time, solar time and sidereal time - Eclipse predictor (lunar node indicators and separation indicator) - User settable geographic location and timezone using an 80,000 city database - A unique face showing the rise and set times of all 5 classical planets plus the Sun and the Moon at once Clock features: - Day/date/month/year indicators, using mechanical wheels - Local and UTC time - Chronograph (stopwatch) with split timer, 1/10 sec accuracy - Alarm clock and interval timer; notifications are delivered in iOS 4 if the app is not running** - World-time watch with 24-city ring on one side and 4 subdials on the other - Calendar watch with rotating wheels showing a full month at a time - Most watches with 1/5 sec or 1/10 sec precision - Synchronized with standard atomic clocks via NTP There are 16 watches in all, with 27 total watch faces (including front and back sides). A setting is available to allow the display to stay on only when plugged in. Play with the watches by tapping on the crown and moving the hands, or press and hold on a date window to zoom through time to see the effect on the heavens. Then just use them to show you when it's time for a break. A complete description of each application feature can be found in the built-in Help screens and on the Emerald Sequoia LLC Web Site, which also includes a demo movie. A developer's blog may also be found at http://emeraldsequoia.com/esblog/ . If you are having any trouble with the application whatsoever, please see our FAQ on the support page listed below and then contact us through that page if your problem is not resolved. We take pride in responding promptly to all support email requests. **NTP accuracy is not guaranteed for alarm delivery if the app is not running. (NTP requires Internet access. Like all apps Emerald Chronometer can not change the device's internal clock.)

About

Precise Timestamp

Capture events with unparalleled accuracy, down to the tenth of a second. Synchronize with NTP servers for precise timekeeping and view detailed sync information. Organize events with descriptions and toggle between absolute and relative time displays.

Highlights
  • NTP server synchronization
  • Tenth-of-a-second accuracy
  • Absolute and relative time modes
  • Event descriptions
  • Event sorting and grouping
  • Sync time details
Features
Read full description

Precise Timestamp: Capture Every Moment Precise Timestamp is your go-to app for capturing the exact time of events down to the tenth of a second. Ensure every moment is pinpointed with utmost accuracy. Features: Unrivaled Timekeeping Accuracy - Achieve high-precision time, synchronized with NTP servers. - Gain complete transparency with details on the last sync time, offset, and round trip time. Dynamic Display Modes: - Effortlessly toggle between Absolute and Relative time displays with a simple click. - Your events, neatly sorted and grouped by dates. - Add rich descriptions to your events, ensuring each stands out. Seamless Event Management: - Benefit from a user-friendly bottom bar for quick toggling between editing and deletion.

Screenshots

Emerald Chronometer4 screens
Precise Timestamp4 screens

Verdict

The call

The clearest difference is monetization model: Precise Timestamp at free against Emerald Chronometer's paid. Precise Timestamp also leads on update cadence (every 5 weeks vs every 22 months) and iOS requirement (13.0 vs 15.0). Emerald Chronometer's advantage is ratings volume (105 vs 7). On price, rating, review sentiment and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Emerald Chronometer against 5.0 for Precise Timestamp. That said, the two scores are not equally well evidenced: Emerald Chronometer has 105 ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 97% of Emerald Chronometer's written reviews are positive against 100% of Precise Timestamp's.

UpkeepUpdate frequency

Emerald Chronometer ships an update every 22 months, Precise Timestamp every 5 weeks. The most recent releases landed on September 18, 2026 and September 3, 2026 respectively.

Scorecard4 real differences · 6 level
Emerald Chronometer versus Precise Timestamp: the parameters behind the verdict, then further details
ParameterEmerald ChronometerPrecise Timestamp
PriceFreeFree
Rating4.9 (105 ratings)5.0 (7 ratings) — better
Positive reviews96.8% of reviews100.0% of reviews — better
Number of ratings105 — better7
Update frequencyEvery 22 monthsEvery 5 weeks — better
Ads—No
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size311 MB19 MB
Age rating4+4+
DeveloperScapa Flow, LLCChris Gillin

Customer experience

Emerald Chronometer

All ratings96 ratings
Positive97.9%
Neutral1.0%
Negative1.0%
Written reviews63 reviews
Positive96.8%
Neutral3.2%
Negative0.0%

Precise Timestamp

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Emerald Chronometer

No in-app purchases

None

Precise Timestamp

No in-app purchases

Questions

Is Emerald Chronometer free?
Emerald Chronometer is free to download, with no in-app purchases.
Is Precise Timestamp free?
Precise Timestamp is free to download, with no in-app purchases.
Which has better reviews, Emerald Chronometer or Precise Timestamp?
Precise Timestamp is rated higher. Emerald Chronometer averages 4.9 out of 5 from 105 ratings, while Precise Timestamp averages 5.0 from 7 ratings.
Which is updated more often, Emerald Chronometer or Precise Timestamp?
Emerald Chronometer ships an update every 22 months, and Precise Timestamp every 5 weeks. Most recently, Emerald Chronometer was updated on September 18, 2026 and Precise Timestamp on September 3, 2026.

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