# CertPro vs Calendar Busy Sync

The clearest difference is in-app purchases: Calendar Busy Sync at none against CertPro's 2. Calendar Busy Sync also leads on iOS requirement (16.0 vs 18.0). CertPro's advantage is update cadence (monthly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. CertPro sells 2 in-app purchases, starting at $4.99 per month. Calendar Busy Sync asks for nothing beyond the download.

CertPro ships an update monthly, Calendar Busy Sync every 2 months. The most recent releases landed on October 19, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CertPro | Calendar Busy Sync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Size | 14 MB | 10 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [RAPHAEL MOMANYI](https://appshunter.io/developer/1884462424) | [Sous Chef Studio, Inc.](https://appshunter.io/developer/1768173412) |

## What reviewers say

### CertPro

[App page](https://appshunter.io/ios/app/certpro-license-tracker/id6761763832)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Certrack Pro Monthly | $4.99 | per month |
| Certrack Pro Annual | $34.99 | per year |


### 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 CertPro free?

CertPro is free to download, with in-app purchases available.

### Is Calendar Busy Sync free?

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

### Do CertPro or Calendar Busy Sync have ads?

Neither CertPro nor Calendar Busy Sync shows ads.

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

CertPro ships an update monthly, and Calendar Busy Sync every 2 months. Most recently, CertPro was updated on October 19, 2026 and Calendar Busy Sync on October 7, 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.*