# Core vs CIEC

The clearest difference is update cadence: CIEC at every 6 days against Core's every 2 months. Core's advantage is iOS requirement (10.0 vs 13.0). 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.

Core ships an update every 2 months, CIEC every 6 days. The most recent releases landed on September 14, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Core | CIEC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Size | 48 MB | 7 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [W-Systems Corp.](https://appshunter.io/developer/1451591992) | [Anh Nguyen Duc](https://appshunter.io/developer/1574177561) |

## What reviewers say

### Core

[App page](https://appshunter.io/ios/app/core-mark-crm/id1476533455)

**Features:** macOS Compatibility

**In-app purchases:** none


### CIEC

[App page](https://appshunter.io/ios/app/ciec/id1578402980)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Core free?

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

### Is CIEC free?

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

### Do Core or CIEC have ads?

Neither Core nor CIEC shows ads.

### Which is updated more often, Core or CIEC?

Core ships an update every 2 months, and CIEC every 6 days. Most recently, Core was updated on September 14, 2026 and CIEC on September 13, 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.*