# Zulu Time vs Interpolator

The clearest difference is price: Interpolator at Free against Zulu Time's $0.99. Interpolator also leads on iOS requirement (12.0 vs 17.6). Zulu Time's advantage is ratings volume (2.6K vs 74) and chart position (#128 vs unranked). On rating, update cadence, ads and in-app purchases there is nothing between them.

Interpolator is free to download; Zulu Time 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 — 4.8 for Zulu Time against 4.9 for Interpolator. That said, the two scores are not equally well evidenced: Zulu Time has 2.6K ratings behind it against 74, so its average is the more settled of the two. Written reviews are what separate them: 79% of Zulu Time's written reviews are positive against 67% of Interpolator's.

Zulu Time ships an update every 3 months, Interpolator every 4 months. The most recent releases landed on October 18, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Zulu Time | Interpolator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.8 (2.6K ratings)](https://appshunter.io/ios/app/zulu-time/id377289826/reviews) | **[4.9 (74 ratings)](https://appshunter.io/ios/app/interpolator/id635235982/reviews)** |
| Number of ratings | **2.6K** | 74 |
| Positive reviews | **78.6% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | Free |
| Best chart rank | **#128** | — |
| Size | 16 MB | 18 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | +4 |
| Developer | [Derek Spears](https://appshunter.io/developer/377289829) | [ron mooring](https://appshunter.io/developer/612283157) |

## What reviewers say

### Zulu Time

[App page](https://appshunter.io/ios/app/zulu-time/id377289826)

**Currently charting:** #128 Top Paid · Utilities (US App Store)

This app displays local and UTC (Zulu) time, along with multiple time zones, on your iPhone, Apple Watch, and iPad. It offers widgets for quick access and features for calculating future or past times with offsets, simplifying timezone conversions for various professions.

**Highlights:** Display local and Zulu (UTC) time, Multiple time zone display, Home and Lock Screen widgets, Apple Watch complications, Future/past time offset calculations, Time zone conversion

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Zulu time on command
- 🔒 Robust security features
- 👍 Easy to read and use
- 👍 Excellent for aviation and radio operators
- 👍 Customizable and syncs correctly

**What reviewers complain about**

- 🐛 Watch complication not updating consistently
- 🐛 Local time not displaying correctly on widget
- 🐛 Complication shows only hours, not full time
- 🐛 Difficulty setting with Daylight Saving Time

**Reported bugs**

- Complication freezes after a few days
- Zulu time loses accuracy over time on Apple Watch
- Widget not updating local time properly

**Requested features**

- Add alarm feature
- Allow landscape mode for bedside clock view
- Provide option for always-on display
- Add time zone map for quick reference
- Show day of year in display


### Interpolator

[App page](https://appshunter.io/ios/app/interpolator/id635235982)

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.

**Highlights:** Two-row interpolation, Three-row interpolation, Table value lookup, No calculator needed, Cargo surveyor tool, General table use

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Zulu Time free?

Zulu Time costs $0.99, with no in-app purchases.

### Is Interpolator free?

Interpolator is free to download, with no in-app purchases.

### Which has better reviews, Zulu Time or Interpolator?

Interpolator is rated higher. Zulu Time averages 4.8 out of 5 from 2.6K ratings, while Interpolator averages 4.9 from 74 ratings.

### Do Zulu Time or Interpolator have ads?

Neither Zulu Time nor Interpolator shows ads.

### Which is updated more often, Zulu Time or Interpolator?

Zulu Time ships an update every 3 months, and Interpolator every 4 months. Most recently, Zulu Time was updated on October 18, 2026 and Interpolator on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*