# Sentnel vs Previjan

The clearest difference is iOS requirement: Previjan at 13.0 against Sentnel's 15.1. 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.

Sentnel ships an update every 3 weeks, Previjan monthly. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sentnel | Previjan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 63 MB | 33 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SENTNEL MONITORAMENTO LTDA](https://appshunter.io/developer/1574730680) | [FAC Sistemas](https://appshunter.io/developer/1568761421) |

## What reviewers say

### Sentnel

[App page](https://appshunter.io/ios/app/sentnel/id1544355802)

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

**In-app purchases:** none


### Previjan

[App page](https://appshunter.io/ios/app/previjan/id1589129979)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sentnel free?

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

### Is Previjan free?

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

### Do Sentnel or Previjan have ads?

Neither Sentnel nor Previjan shows ads.

### Which is updated more often, Sentnel or Previjan?

Sentnel ships an update every 3 weeks, and Previjan monthly. Most recently, Sentnel was updated on October 20, 2026 and Previjan on October 8, 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.*