# Serea Smart Lock vs Lineár Calendar

The clearest difference is in-app purchases: Serea Smart Lock at none against Lineár Calendar's 1. Serea Smart Lock also leads on iOS requirement (15.0 vs 17.0). Lineár Calendar's advantage is update cadence (every 10 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Lineár Calendar sells 1 one-off in-app purchase. Serea Smart Lock asks for nothing beyond the download.

Serea Smart Lock ships an update every 3 months, Lineár Calendar every 10 days. The most recent releases landed on September 9, 2026 and August 10, 2026 respectively.

## The numbers

| Metric | Serea Smart Lock | Lineár Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/linear-calendar/id6757320187/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 95.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | — | Free |
| Size | 62 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [PEWAG](https://appshunter.io/developer/1716692699) | [TheMM](https://appshunter.io/developer/312265848) |

## What reviewers say

### Serea Smart Lock

[App page](https://appshunter.io/ios/app/serea-smart-lock/id6472162995)

**In-app purchases:** none


### Lineár Calendar

[App page](https://appshunter.io/ios/app/linear-calendar/id6757320187)

Visualize your entire year in a single, elegant view. This app offers multiple perspectives and customization options to help you spot busy periods and find gaps instantly. Plan more effectively by seeing the bigger picture of your schedule.

**Highlights:** Full year view, Horizontal and vertical layouts, Linear and regular day alignments, Coloured event bars, Calendar filtering and custom colours, Sticky header/column, PDF export

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lineár Pro | $4.99 | one-time |


## Frequently asked questions

### Is Serea Smart Lock free?

Serea Smart Lock is free to download, with no in-app purchases.

### Is Lineár Calendar free?

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

### Do Serea Smart Lock or Lineár Calendar have ads?

Neither Serea Smart Lock nor Lineár Calendar shows ads.

### Which is updated more often, Serea Smart Lock or Lineár Calendar?

Serea Smart Lock ships an update every 3 months, and Lineár Calendar every 10 days. Most recently, Serea Smart Lock was updated on September 9, 2026 and Lineár Calendar on August 10, 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.*