# Horologium Romanum — The Roman Clock

> Roman numeral clock and date display with optional sunrise/sunset time measurement. (iPhone/iPad app by Stephen Taylor.)

- Source: https://appshunter.io/ios/app/horologium-romanum/id1150449867 (this page in markdown: same URL + `.md`)
- Developer: [Stephen Taylor](https://appshunter.io/developer/1150449866)
- Category: Utilities, Reference
- Price: $1.99
- Rating: 4.20/5 from 5 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 15 MB
- Languages: American English
- Released: 2016-09-29
- Data updated: 2026-06-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/horologium-romanum/id1150449867/reviews.md

## What is Horologium Romanum?

Shows the time in Roman numerals (VIII:IX), and the date as, for instance, “Ante Diem Kal. XII Ivlivs” for 12 days before the Kalends of July.

The day, the date, the proverb of the day, and the help text can all be in either English or Latin. You’ll use Latin of course – I’ve just provided the English text for other people who are less erudite than you.

For those who seriously want to be Roman, the time can optionally be measured Roman style – still a twenty four hour day, but with the twelve hours of day measured from sunrise to sunset, and the twelve hours of night measured from sunset to sunrise. This way of measuring time has three notable properties;

- hours and minutes will be a slightly different length each day, as the seasons pass and the days get shorter or longer.
- hours and minutes will be a slightly different length at different latitudes, even on the same day. This is why the app asks you to let it use your location when you’re using Roman style time – it needs it to work out the sunrise and sunset times.
- you will never be on time for an appointment again

As the help text says:
“Sequens programmatiunculum ad Horologium Romanum pertinens conscripsi ut peregrinatoribus qui ab Imperio Romano ad haec tempora iter faciunt auxilio sit. Immo vero etiam aliis lectoribus forsitan utile esse possit.”

That is to say – “Horologium Romanum – The Roman Clock app – was written as an aid to time travellers from the Roman Empire who have chosen to visit the 21st century. Even if you do not fall into that group you may still find it useful.”

## Key features

- Roman numeral time display
- Roman numeral date display
- English and Latin language options
- Optional Roman-style time measurement
- Sunrise/sunset based hour calculation
- Location-based time adjustment

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/horologium-romanum/id1150449867/reviews.md

### 1/5 — Very Disappointing and Expensive

*2022-08-29, version 1.2*

UPDATE: After viewing a while, the Roman clock is totally whacked. There appears to be no rhyme or reason to the time displayed.
ORIGINAL: This seems to be based on the civil clock. I was really hoping the 12-hour option would have the hōra prīma stating at daybreak and nox beginning at sunset. Not that I know all that much about it, per se, but enough to be disappointed. The calendar dates seem, so far, to be spot on, but I could have figured that out myself. The clock is the harder part. This is not worth the price at all. NOTE: It’s also unsupported.

### 5/5 — This is a fun clock!

*2020-11-12, version 1.2*

It’s cool and works great

### 5/5 — Creative way to show time

*2016-11-30, version 1.0*

This is a fun way of displaying time. I have found that the app is good way to force myself to practice Roman Numerals if I want to know the current time.

There are also some nice little additions to the clock that have made me learn a few new things, such as what the word "Kalends" means (the first day of the month on the ancient Roman Calendar)

Showed it to a friend who is trying to teach Roman Numerals to her daughter and she was pretty excited by this.

### 5/5 — This is a great app

*2016-10-02, version 1.0*

I've never concentrated on reading Roman numerals as hard as I do with this app. I'm especially enjoying explaining to my 7 year old why IX isn't written as VIIII. 
I recommend this to anyone who hasn't forgiven the Caesars for allowing the barbarians to become citizens...

### 5/5 — Praesignis

*2016-10-01, version 1.0*

Possibly the finest Latin language clock currently available

## Frequently asked questions about Horologium Romanum

### What is Horologium Romanum?

Horologium Romanum displays the current time and date using Roman numerals, offering a unique way to track time. It also includes an optional feature to measure time based on sunrise and sunset.

### How does the Roman-style time measurement work in Horologium Romanum?

This mode measures the twelve hours of day from sunrise to sunset and the twelve hours of night from sunset to sunrise. The length of these hours and minutes will vary daily with the seasons and by latitude, requiring location access.

### Can Horologium Romanum be used in Latin?

Yes, the app supports both English and Latin for the day, date, proverb, and help text. You can choose to display all information in Latin for a more authentic Roman experience.

### What devices is Horologium Romanum available on?

Horologium Romanum is available on iPhone, iPad, and iPod. It is designed for iOS devices.

### How often is Horologium Romanum updated?

The latest version of Horologium Romanum is 1.3, which was last updated on April 28, 2025. Updates are released periodically to improve functionality and compatibility.

### What is the price of Horologium Romanum?

Horologium Romanum is a paid application and costs $1.99. This one-time purchase grants you access to all its features.

### What is the age rating for Horologium Romanum?

Horologium Romanum has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Does Horologium Romanum have ads?

No, Horologium Romanum does not contain advertisements. As a paid application, it provides an ad-free experience for users.

## Version history (last 4 releases)

### 1.3 — 2025-04-28

Minor fixes.

### 1.2 — 2020-10-25

Minor bug fixes.

### 1.1 — 2018-06-20

Now behaves properly with iPhoneX. Also cleaned up a typo or two in the help text.

### 1.0 — 2016-09-29

No release notes.

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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 2026-06-01.*