# Blue Sentry vs e

The clearest difference is update cadence: e at every 3 days against Blue Sentry's every 23 months. 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.

Blue Sentry ships an update every 23 months, e every 3 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Blue Sentry | e |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 3 days** |
| Size | 33 MB | 27 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Elbis](https://appshunter.io/developer/1455228882) | [Deputy Ministry for Research, Innovation & Digital Policy](https://appshunter.io/developer/1510330600) |

## What reviewers say

### Blue Sentry

[App page](https://appshunter.io/ios/app/blue-sentry/id1599079697)

**Features:** macOS Compatibility

**In-app purchases:** none


### e

[App page](https://appshunter.io/ios/app/e-kofini/id6739127228)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Blue Sentry free?

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

### Is e free?

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

### Do Blue Sentry or e have ads?

Neither Blue Sentry nor e shows ads.

### Which is updated more often, Blue Sentry or e?

Blue Sentry ships an update every 23 months, and e every 3 days. Most recently, Blue Sentry was updated on October 7, 2026 and e on October 9, 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.*