Interpolator vs Julian Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interpolator
Easily find values within tables using interpolation for two or three rows. This utility app simplifies calculations without needing a separate calculator, making it ideal for various table-based environments.
- Two-row interpolation
- Three-row interpolation
- Table value lookup
- No calculator needed
- Cargo surveyor tool
- General table use
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This is a small app which makes it very easy to look up values in tables (math etc) when you have to interpolate both in two and in three rows. No more need for a calculator to interpolate manually. This app was designed primarily for cargo surveyors working with tank calibration tables, but the app does have its application in any environment where tables are used. As of 13th January 2015, this app has become FREE until further notice.
Julian Clock
This utility app displays the current Julian Date, time with seconds, military date format, day of the week, and Zulu time (GMT). It's designed for quick access to essential timekeeping information.
- Julian Date display
- Real-time clock with seconds
- Military date format
- Day of the week
- ZULU time (GMT)
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It's as simple as it gets, a Julian date and clock app built for people who need the numbers fast. Julian Clock shows everything you need at a glance: • Julian date (YJJJ or YYDDD, your choice in Settings) • Local time with running seconds • Date in military format (e.g. 19JUN26) • Day of the week • Zulu time (GMT) New in version 2 • Home Screen widgets — small and medium layouts with Julian date, Zulu, and military date • Lock Screen widgets — circular, rectangular, and inline at-a-glance views • Apple Watch app — Julian date and Zulu on your wrist, plus complications • iPad support — universal layout for desk and EFB use • Historical lookup — pick any date on the calendar to get its Julian day • Eight themes — Navy, Air Force, Army, Marines, Coast Guard, Space Force, Dark, and Light Widgets and the Watch app stay in sync with your format and theme choices. This app is for military and DOD personnel who constantly need a quick look at the Julian date and/or Zulu time, on the phone, on the lock screen, on the watch, or on an iPad beside the job.
Screenshots
Verdict
The clearest difference is price: Interpolator at Free against Julian Clock's $0.99. Interpolator also leads on update cadence (every 4 months vs every 69 months) and ratings volume (74 vs 15). Julian Clock's advantage is review sentiment (100% vs 67%) and chart position (#73 vs unranked). On rating, 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
Interpolator is free to download; Julian Clock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for Interpolator against 4.9 for Julian Clock. Both are backed by a comparable volume of ratings — 74 and 15 respectively. Written reviews are what separate them: 67% of Interpolator's written reviews are positive against 100% of Julian Clock's.
Interpolator ships an update every 4 months, Julian Clock every 69 months. The most recent releases landed on September 26, 2026 and October 8, 2026 respectively.
| Parameter | Interpolator | Julian Clock |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.9 (74 ratings) | 4.9 (15 ratings) |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 74 — better | 15 |
| Update frequency | Every 4 months — better | Every 69 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | — | #73 — better |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 18 MB | 4 MB |
| Age rating | +4 | 4+ |
| Developer | ron mooring | Adam Allard |
Customer experience
Interpolator
Julian Clock
In-app purchases
Interpolator
No in-app purchases
Julian Clock
No in-app purchases
Questions
Is Interpolator free?
Is Julian Clock free?
Which has better reviews, Interpolator or Julian Clock?
Do Interpolator or Julian Clock have ads?
Which is updated more often, Interpolator or Julian Clock?
Other comparisons
