# Animal Sensor vs Days Until

The clearest difference is ads: Animal Sensor at none against Days Until's shown. Animal Sensor also leads on iOS requirement (12.0 vs 18.0). Days Until's advantage is update cadence (daily vs every 4 months). On price, in-app purchases and device support there is nothing between them.

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

Animal Sensor ships an update every 4 months, Days Until daily. The most recent releases landed on October 19, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Animal Sensor | Days Until |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Daily** |
| Size | 34 MB | 31 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Biocontrol](https://appshunter.io/developer/1586087157) | [Legal Prompt Inc.](https://appshunter.io/developer/1490746932) |

## What reviewers say

### Animal Sensor

[App page](https://appshunter.io/ios/app/animal-sensor/id1609202056)

**Features:** macOS Compatibility

**In-app purchases:** none


### Days Until

[App page](https://appshunter.io/ios/app/days-until-countdown-widgets/id6803622543)

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

**In-app purchases:** none


## Frequently asked questions

### Is Animal Sensor free?

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

### Is Days Until free?

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

### Do Animal Sensor or Days Until have ads?

Days Until shows ads; Animal Sensor does not.

### Which is updated more often, Animal Sensor or Days Until?

Animal Sensor ships an update every 4 months, and Days Until daily. Most recently, Animal Sensor was updated on October 19, 2026 and Days Until on October 17, 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.*