# Sentinel InstaCheck + vs OtisIO

The clearest difference is update cadence: OtisIO at every 10 days against Sentinel InstaCheck +'s every 4 months. Sentinel InstaCheck +'s advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

Sentinel InstaCheck + ships an update every 4 months, OtisIO every 10 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sentinel InstaCheck + | OtisIO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Size | 3 MB | 90 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Energy & Compliance Technology Ltd](https://appshunter.io/developer/1533793622) | [SiegeOne Limited](https://appshunter.io/developer/6790729952) |

## What reviewers say

### Sentinel InstaCheck +

[App page](https://appshunter.io/ios/app/sentinel-instacheck-plus/id6745335462)

**Features:** macOS Compatibility

**In-app purchases:** none


### OtisIO

[App page](https://appshunter.io/ios/app/otisio-workforce-management/id6790729950)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sentinel InstaCheck + free?

Sentinel InstaCheck + is free to download, with no in-app purchases.

### Is OtisIO free?

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

### Do Sentinel InstaCheck + or OtisIO have ads?

Neither Sentinel InstaCheck + nor OtisIO shows ads.

### Which is updated more often, Sentinel InstaCheck + or OtisIO?

Sentinel InstaCheck + ships an update every 4 months, and OtisIO every 10 days. Most recently, Sentinel InstaCheck + was updated on October 28, 2026 and OtisIO on October 31, 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.*