# ECC Toolkit vs Calendar Busy Sync

The clearest difference is ads: Calendar Busy Sync at none against ECC Toolkit's shown. Calendar Busy Sync also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (16.0 vs 18.6). On price, 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.

ECC Toolkit ships an update every 5 months, Calendar Busy Sync every 2 months. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | ECC Toolkit | Calendar Busy Sync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 14 MB | 10 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ECCORECT PTE. LTD.](https://appshunter.io/developer/1746312519) | [Sous Chef Studio, Inc.](https://appshunter.io/developer/1768173412) |

## What reviewers say

### ECC Toolkit

[App page](https://appshunter.io/ios/app/ecc-toolkit/id6743757970)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calendar Busy Sync

[App page](https://appshunter.io/ios/app/calendar-busy-sync/id6762634278)

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

**In-app purchases:** none


## Frequently asked questions

### Is ECC Toolkit free?

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

### Is Calendar Busy Sync free?

Calendar Busy Sync is free to download, with no in-app purchases.

### Do ECC Toolkit or Calendar Busy Sync have ads?

ECC Toolkit shows ads; Calendar Busy Sync does not.

### Which is updated more often, ECC Toolkit or Calendar Busy Sync?

ECC Toolkit ships an update every 5 months, and Calendar Busy Sync every 2 months. Most recently, ECC Toolkit was updated on November 8, 2026 and Calendar Busy Sync on November 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.*