# C365 Ultra vs E4 Flex

The clearest difference is update cadence: C365 Ultra at every 11 days against E4 Flex's every 21 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.

C365 Ultra ships an update every 11 days, E4 Flex every 21 months. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | C365 Ultra | E4 Flex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/e4-flex/id1593079643/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 21 months |
| Monetization | — | Free |
| Size | 89 MB | 1 MB |
| Requires iOS | 14.0 | **13.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NIRVASOFT PTE. LTD.](https://appshunter.io/developer/1543323745) | [Paul Hamel](https://appshunter.io/developer/1593079645) |

## What reviewers say

### C365 Ultra

[App page](https://appshunter.io/ios/app/c365-ultra/id1567789435)

**Features:** macOS Compatibility

**In-app purchases:** none


### E4 Flex

[App page](https://appshunter.io/ios/app/e4-flex/id1593079643)

This app enables field technicians to connect to and manage E4 Flex readers via Bluetooth Low Energy. It allows for sending commands and receiving responses, facilitating configuration and testing of the readers.

**Highlights:** Connect to E4 Flex readers via BLE, Send commands to readers, Receive responses from readers, Configure E4 Flex readers, Test E4 Flex readers

**In-app purchases:** none


## Frequently asked questions

### Is C365 Ultra free?

C365 Ultra is free to download, with no in-app purchases.

### Is E4 Flex free?

E4 Flex is free to download, with no in-app purchases.

### Do C365 Ultra or E4 Flex have ads?

Neither C365 Ultra nor E4 Flex shows ads.

### Which is updated more often, C365 Ultra or E4 Flex?

C365 Ultra ships an update every 11 days, and E4 Flex every 21 months. Most recently, C365 Ultra was updated on October 14, 2026 and E4 Flex on October 20, 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.*