# Smart Sensor 4.0 vs Night Calendar

The clearest difference is ads: Smart Sensor 4.0 at none against Night Calendar's shown. Smart Sensor 4.0 also leads on update cadence (every 3 months vs every 8 months) and iOS requirement (8.0 vs 16.6). 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.

Smart Sensor 4.0 ships an update every 3 months, Night Calendar every 8 months. The most recent releases landed on October 10, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Smart Sensor 4.0 | Night Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/night-calendar/id6502763188/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | — | Ad-supported |
| Size | 77 MB | 19 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Infinite Uptime India Pvt Ltd](https://appshunter.io/developer/1511466684) | [Motoki Takahashi](https://appshunter.io/developer/1411233238) |

## What reviewers say

### Smart Sensor 4.0

[App page](https://appshunter.io/ios/app/smart-sensor-40/id1511517119)

**Features:** macOS Compatibility

**In-app purchases:** none


### Night Calendar

[App page](https://appshunter.io/ios/app/night-calendar/id6502763188)

This app allows you to customize your daily schedule by changing the start time of your day. Events occurring before your set start time will be displayed as part of the previous day's schedule, offering a flexible way to view your commitments.

**Highlights:** Adjustable daily start time, Events displayed for previous/next day, Flexible schedule viewing, Customizable time zones

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smart Sensor 4.0 free?

Smart Sensor 4.0 is free to download, with no in-app purchases.

### Is Night Calendar free?

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

### Do Smart Sensor 4.0 or Night Calendar have ads?

Night Calendar shows ads; Smart Sensor 4.0 does not.

### Which is updated more often, Smart Sensor 4.0 or Night Calendar?

Smart Sensor 4.0 ships an update every 3 months, and Night Calendar every 8 months. Most recently, Smart Sensor 4.0 was updated on October 10, 2026 and Night Calendar on October 22, 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.*