# iService/ DeviceOn vs PromptSentry

The clearest difference is in-app purchases: iService/ DeviceOn at none against PromptSentry's 1. iService/ DeviceOn also leads on iOS requirement (15.6 vs 26.4). PromptSentry's advantage is update cadence (every 5 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. PromptSentry sells 1 one-off in-app purchase. iService/ DeviceOn asks for nothing beyond the download.

iService/ DeviceOn ships an update every 4 months, PromptSentry every 5 days. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | iService/ DeviceOn | PromptSentry |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Size | 27 MB | 378 MB |
| Requires iOS | **15.6** | 26.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Advantech Co., Ltd.](https://appshunter.io/developer/413213069) | [TOLGA BARIS KOC](https://appshunter.io/developer/1828512205) |

## What reviewers say

### iService/ DeviceOn

[App page](https://appshunter.io/ios/app/iservice-deviceon/id6461349429)

**Features:** macOS Compatibility

**In-app purchases:** none


### PromptSentry

[App page](https://appshunter.io/ios/app/promptsentry/id6762153225)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PromptSentry Ultra | $8.99 | one-time |


## Frequently asked questions

### Is iService/ DeviceOn free?

iService/ DeviceOn is free to download, with no in-app purchases.

### Is PromptSentry free?

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

### Do iService/ DeviceOn or PromptSentry have ads?

Neither iService/ DeviceOn nor PromptSentry shows ads.

### Which is updated more often, iService/ DeviceOn or PromptSentry?

iService/ DeviceOn ships an update every 4 months, and PromptSentry every 5 days. Most recently, iService/ DeviceOn was updated on October 7, 2026 and PromptSentry on October 12, 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.*