# WattTimeIsIt? vs Datum

The clearest difference is review sentiment: Datum at 100% against WattTimeIsIt?'s 50%. Datum also leads on update cadence (every 3 months vs every 40 months) and device support (5 vs 3). WattTimeIsIt?'s advantage is price ($0.99 vs $1.99) and iOS requirement (14.0 vs 17.6). On ads, in-app purchases and monetization model there is nothing between them.

WattTimeIsIt? costs $0.99 and Datum $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

WattTimeIsIt? ships an update every 40 months, Datum every 3 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | WattTimeIsIt? | Datum |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/watttimeisit/id652579407/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 2 MB | 15 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Visoft, Inc.](https://appshunter.io/developer/652579430) | [Michael Lindinger](https://appshunter.io/developer/1431086653) |

## What reviewers say

### WattTimeIsIt?

[App page](https://appshunter.io/ios/app/watttimeisit/id652579407)

Easily adjust cooking times for frozen meals based on your microwave's wattage. Avoid under or overcooking your food by converting standard instructions to match your specific appliance.

**Highlights:** Adjust cooking times for wattage differences, Prevent under/overcooking food, Works with various microwave wattages, Ensures perfectly cooked meals, Simple and easy to use tool

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

**In-app purchases:** none


### Datum

[App page](https://appshunter.io/ios/app/datum-calendar/id1552646317)

A minimalist calendar application designed for Apple devices, offering a clean interface and customizable widgets for iOS, macOS, and watchOS. View upcoming events, daily schedules, and monthly overviews directly from your home screen or watch face.

**Highlights:** Minimalist calendar interface, Lockscreen widgets for iOS, Event display widgets, Calendar widgets with event marks, watchOS calendar and complications, Support for iPhone, iPad, Mac, and Apple Watch

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is WattTimeIsIt? free?

WattTimeIsIt? costs $0.99, with no in-app purchases.

### Is Datum free?

Datum costs $1.99, with no in-app purchases.

### Do WattTimeIsIt? or Datum have ads?

Neither WattTimeIsIt? nor Datum shows ads.

### Which is updated more often, WattTimeIsIt? or Datum?

WattTimeIsIt? ships an update every 40 months, and Datum every 3 months. Most recently, WattTimeIsIt? was updated on November 1, 2026 and Datum on November 3, 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.*