# Presence vs ISI Sys

The clearest difference is update cadence: Presence at every 6 days against ISI Sys's every 2 weeks. On price, ads, 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.

Presence ships an update every 6 days, ISI Sys every 2 weeks. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Presence | ISI Sys |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Size | 65 MB | 149 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Agriness Sistemas e Tecnologias de Informacao Ltda EPP](https://appshunter.io/developer/1128610609) | [Intersoft](https://appshunter.io/developer/1480525187) |

## What reviewers say

### Presence

[App page](https://appshunter.io/ios/app/presence/id1487838421)

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

**In-app purchases:** none


### ISI Sys

[App page](https://appshunter.io/ios/app/isi-sys/id1628666266)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Presence free?

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

### Is ISI Sys free?

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

### Do Presence or ISI Sys have ads?

Neither Presence nor ISI Sys shows ads.

### Which is updated more often, Presence or ISI Sys?

Presence ships an update every 6 days, and ISI Sys every 2 weeks. Most recently, Presence was updated on November 11, 2026 and ISI Sys on November 7, 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.*