# HDI Authenticator vs WeatherCal

The clearest difference is in-app purchases: HDI Authenticator at none against WeatherCal's 2. HDI Authenticator also leads on iOS requirement (11.0 vs 17.0). WeatherCal's advantage is update cadence (every 5 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. WeatherCal sells 2 in-app purchases, starting at $0.29 per month. HDI Authenticator asks for nothing beyond the download.

HDI Authenticator ships an update every 4 months, WeatherCal every 5 days. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HDI Authenticator | WeatherCal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/weathercal-simple-wedical/id6745094731/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 22 MB | 15 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [KOREAEXPERT](https://appshunter.io/developer/1161606505) | [Bison](https://appshunter.io/developer/1801686645) |

## What reviewers say

### HDI Authenticator

[App page](https://appshunter.io/ios/app/hdi-authenticator/id1642884813)

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

**In-app purchases:** none


### WeatherCal

[App page](https://appshunter.io/ios/app/weathercal-simple-wedical/id6745094731)

This app combines weather forecasts with your daily schedule, offering sweet messages from animated Weather Fairies. Plan your days and trips more effectively by seeing the weather directly on your calendar. It also includes holidays from multiple countries and features easy drag-and-drop scheduling.

**Highlights:** Weather forecasts integrated into calendar, Motivational messages from Weather Fairies, Multi-country holiday listings, Drag-and-drop scheduling, Intuitive interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Weather Service | $0.29 | per month |
| Lifetime Weather Forecast | $3.99 | one-time |


## Frequently asked questions

### Is HDI Authenticator free?

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

### Is WeatherCal free?

WeatherCal is free to download, with in-app purchases available.

### Do HDI Authenticator or WeatherCal have ads?

Neither HDI Authenticator nor WeatherCal shows ads.

### Which is updated more often, HDI Authenticator or WeatherCal?

HDI Authenticator ships an update every 4 months, and WeatherCal every 5 days. Most recently, HDI Authenticator was updated on November 7, 2026 and WeatherCal on October 30, 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.*