# Lịch vs PQS IoT

The clearest difference is iOS requirement: Lịch at 12.4 against PQS IoT's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Lịch ships an update every 5 weeks, PQS IoT every 2 months. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Lịch | PQS IoT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 20 MB | 5 MB |
| Requires iOS | **12.4** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TRAN PHU](https://appshunter.io/developer/1681017060) | [Ban Bui](https://appshunter.io/developer/1471920355) |

## What reviewers say

### Lịch

[App page](https://appshunter.io/ios/app/lich-lich-viet/id6449436837)

**Features:** macOS Compatibility

**In-app purchases:** none


### PQS IoT

[App page](https://appshunter.io/ios/app/pqs-iot/id6744650902)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lịch free?

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

### Is PQS IoT free?

PQS IoT is free to download, with no in-app purchases.

### Do Lịch or PQS IoT have ads?

Neither Lịch nor PQS IoT shows ads.

### Which is updated more often, Lịch or PQS IoT?

Lịch ships an update every 5 weeks, and PQS IoT every 2 months. Most recently, Lịch was updated on October 27, 2026 and PQS IoT on October 28, 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.*