# Emerald Timestamp

> Precise event time capture and highly accurate running clock. (iPhone/iPad app by Emerald Sequoia LLC.)

- Source: https://appshunter.io/ios/app/emerald-timestamp/id371935298 (this page in markdown: same URL + `.md`)
- Developer: [Emerald Sequoia LLC](https://appshunter.io/developer/284953673)
- Category: Utilities, Lifestyle
- Price: Free
- Rating: 4.89/5 from 18 App Store ratings · 27 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 5 MB
- Languages: English
- Released: 2010-05-17
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/emerald-timestamp/id371935298/reviews.md

## What is Emerald Timestamp?

Emerald Timestamp captures the precise time of events, and lets you associate a description with each one.  It is also a highly-accurate running clock.

Very high precision:
- Uses atomic clocks via NTP, usually accurate to within 0.2 second
- Color coding (yellow and green) makes it obvious when you have a valid synchronization
- The network is required for synchronization, but you can record events without it with less accuracy
- When the app restarts, it uses the previous synchronization offset until the first sync comes in
- Version 2.0 and above display leap seconds in progress

Events are grouped by day in a scrolling list
- Record as many events as you like
- Add a description to any or all events
- Create multiple buttons with custom names to predefine event descriptions
- Easily show the difference in time between any two events

Easily cycle between time representations by tapping on a time in the display:
- Local 12-hour time
- Local 24-hour time
- UTC (aka GMT)
- Julian Date (JD) (settable globally to JD(TT) or JD(UTC))
- Interval from a reference time (using any event as a zero reference)

There is also a running clock at the top of the display showing the time in the chosen format.

You can use a hardware keyboard (such as the iPad Pro's Smart Keyboard) to trigger events using the space bar, enter key, or digits 1 through 0.  [NOTE: if the keyboard is a bluetooth keyboard (unlike the Smart Keyboard which is direct connect) there will be a slight delay between the keyboard press and the time the app records.]

Email the time and description of an event, or all events (uses your device's email program), optionally using TSV or CSV for spreadsheets.

A complete description of each application feature can be found in the built-in Help screens and on the Emerald Sequoia LLC Web Site.  A developer's blog may also be found at http://emeraldsequoia.com/esblog/ .

All date displays are localized, though the interface and Help are in English only.

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 time synchronization requires network access.  Like all other iOS apps, Emerald Timestamp cannot set the device's internal clock.)

## Key features

- High precision time synchronization
- Event description association
- Multiple time representation formats
- Customizable event buttons
- Time difference calculation
- Hardware keyboard support
- Export event data via email

## Recent user reviews (10 of 27)

All indexed reviews: https://appshunter.io/ios/app/emerald-timestamp/id371935298/reviews.md

### 5/5 — Great app

*2021-10-07, version 2.3.3*

This app is great. I use it to track symptoms I’m having and record their frequency. It’s a great way to show my doctor how frequently a symptom is occurring, and it is super simple to use.

### 5/5 — Very useful app

*2021-01-21, version 2.2.1*

I love this app!  There is one feature I’d like to see: a display of the lapsed time between EACH button press. I know there is a setting for time between a single point in time and the button press time, but that isn’t as useful.  Otherwise, a great app!

**Developer response:** Thanks for taking the time to review!  In the Options panel at the bottom is an option for "Allow Multiple Zeroes". This allows you to specify the "zero points" that you want, so by clicking the zero symbol on each event you'll see each event-to-event interval in interval mode.

### 4/5 — Great But

*2020-09-12, version 2.2.1*

This app would perfect if it supported separate lists of the times rather than combining them all - I would creat a list of medicines, lists of task completions for various projects , a list for workouts, a list for household chores, etc. etc.

### 5/5 — Excellent app

*2019-12-15, version 2.2.1*

Use this for logging milestones while travelling and for critical client calls, so I know when we spoke.  Easy to use and accurate.

### 5/5 — Great App used in Race Timing

*2018-09-07, version 2.1.3*

As a race timer for over a decade, I’ve needed independent way to capture an accurate time of day. This app has been a near perfect solution. It has been worth the price. The only improvement would be making one of the volume buttons able to capture a time so I didn’t need to be looking at my phone.

### 5/5 — Timestamp

*2017-10-27, version 2.1.3*

Only thing that could make this better is iPhone hardware button trigger. (Like the camera app can use the volume up button to take photos.)

Almost no difference compared to GPS 1 PPS. 

A nice piece of work. Great for astronomy. With iPod Touch one cannot set the device's time precisely. This app takes care of that.

### 5/5 — Simple, works great

*2017-10-06, version 2.1.3*

Please keep up with updates.  I have used this for many years!

### 4/5 — works well

*2017-06-26, version 2.1.3*

Thank you. Any plans for a widget? I think that would be a nice to have.

### 5/5 — Awesome!

*2016-11-23, version 2.1.2*

Thank you for this app and keep the updates coming.  Ironically I bought this app after my Casio G-Shock fell off my wrist and into the ocean.  I always used the Time Memo feature on my wrist watch and was looking for a good high end watch when I found a link to the Emerald Geneva watch and the Emerald Timestamp app.  Wow!  What a set of Apps.  I bought both the Emerald Timestamp and Emerald Chronometer (They have a cheaper Geneva App but I wanted them to keep creating watches so I gave them what I thought they were worth!) and I am very pleased.  Maybe just maybe they could make the first watch created after an app!  I LOVE IT!!! Thank you!  Both Timestamp and Chronometer are A++ apps!

### 5/5 — Great for Interviews

*2016-11-17, version 2.1.1*

I use this to log live interviews for video news production. Wow, sell this app for this purpose and you've got a big hit. Thank you!

## Frequently asked questions about Emerald Timestamp

### What does Emerald Timestamp do?

Emerald Timestamp captures the precise time of events and allows you to associate a description with each one. It also functions as a highly accurate running clock, synchronizing with atomic clocks via NTP for precision usually within 0.2 seconds.

### How accurate is the time synchronization?

The app uses atomic clocks via NTP, typically achieving accuracy within 0.2 seconds. Color coding indicates when synchronization is valid. While network is required for synchronization, events can be recorded without it, albeit with less accuracy.

### What are the different time representations available?

You can easily cycle through local 12-hour time, local 24-hour time, UTC (GMT), Julian Date (JD), and intervals from a reference time. Tapping on a time in the display allows you to switch between these formats.

### Can I export my recorded events?

Yes, you can email the time and description of individual events or all events. The export can be formatted using TSV or CSV for easy import into spreadsheets, utilizing your device's email program.

### Is this app compatible with external keyboards?

Yes, the app supports hardware keyboards, including those like the iPad Pro's Smart Keyboard. You can trigger events using keys like the space bar, enter key, or digits 1 through 0. Note that Bluetooth keyboards may introduce a slight delay.

## Version history (last 2 releases)

### 2.3.6 — 2023-08-07

Warning message at startup.

### 2.3.5 — 2022-03-24

Support for iOS 15.3

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## More apps by Emerald Sequoia LLC

- [Emerald Time](https://appshunter.io/ios/app/emerald-time/id290384375)
- [Emerald Geneva](https://appshunter.io/ios/app/emerald-geneva/id347828665)
- [Emerald Observatory for iPad](https://appshunter.io/ios/app/emerald-observatory-for-ipad/id364904759)
- [Emerald Chronometer HD](https://appshunter.io/ios/app/emerald-chronometer-hd/id435033000)

All apps by Emerald Sequoia LLC: https://appshunter.io/developer/284953673

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*