# ZoneTime vs Calculator T

The clearest difference is update cadence: Calculator T at every 2 days against ZoneTime's every 3 months. ZoneTime's advantage is iOS requirement (8.0 vs 11.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ZoneTime ships an update every 3 months, Calculator T every 2 days. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | ZoneTime | Calculator T |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zonetime/id852849552/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 26 MB | 16 MB |
| Requires iOS | **8.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glen Tregoning](https://appshunter.io/developer/852849555) | [Xiao Hou Yi Sheng Traditional Chinese Medicine Technology (Shenzhen) Co., Ltd](https://appshunter.io/developer/1524258136) |

## What reviewers say

### ZoneTime

[App page](https://appshunter.io/ios/app/zonetime/id852849552)

Easily compare timezones to schedule meetings and avoid calling people at inconvenient hours. The app features a widget for quick glances and a table to compare up to 20 locations, automatically adjusting for Daylight Saving Time.

**Highlights:** View overlapping timezone hours, Schedule meetings across timezones, Today Widget for quick time checks, Compare up to 20 locations, Color-coded 'OK to call' times, Automatic Daylight Saving Time adjustment, Create calendar events across timezones

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

**In-app purchases:** none


### Calculator T

[App page](https://appshunter.io/ios/app/calculator-t/id6473983653)

This app offers advanced scientific calculation and unit conversion capabilities. It features a history tape, memory functions, and supports complex mathematical operations. It also includes currency exchange rates and a wide range of measurement conversions.

**Highlights:** Standard and scientific function modes, Extensive unit conversion (over 300 units), History tape for last 100 records, Memory buttons (MS, M+, M-, MR, MC), Copy/paste functionality for equations and results, Support for large number calculations and scientific notation, Currency exchange rate conversion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZoneTime free?

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

### Is Calculator T free?

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

### Do ZoneTime or Calculator T have ads?

Neither ZoneTime nor Calculator T shows ads.

### Which is updated more often, ZoneTime or Calculator T?

ZoneTime ships an update every 3 months, and Calculator T every 2 days. Most recently, ZoneTime was updated on September 9, 2026 and Calculator T on June 1, 2026.

---

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