# Calendar Busy Sync vs ProvenFlight

The clearest difference is in-app purchases: Calendar Busy Sync at none against ProvenFlight's 2. ProvenFlight's advantage is update cadence (every 3 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ProvenFlight sells 2 in-app purchases, starting at $129.00 per year. Calendar Busy Sync asks for nothing beyond the download.

Calendar Busy Sync ships an update every 2 months, ProvenFlight every 3 days. The most recent releases landed on October 7, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Calendar Busy Sync | ProvenFlight |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/provenflight/id6804824556/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 10 MB | 73 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sous Chef Studio, Inc.](https://appshunter.io/developer/1768173412) | [Cubic Insights LLC](https://appshunter.io/developer/1763432190) |

## What reviewers say

### Calendar Busy Sync

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

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

**In-app purchases:** none


### ProvenFlight

[App page](https://appshunter.io/ios/app/provenflight/id6804824556)

Effortlessly manage your military flight records with AI-powered logging. Import various formats, speak flight drafts, and track career hours for airline applications. Keep military and civilian flying data in one place.

**Highlights:** AI-powered flight logging, Import military and civilian records, Voice-to-text flight entry, Track career hours and currency, Prepare for airline applications, Export to CSV and other apps

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $129.00 | per year |
| Lifetime | $299.00 | one-time |


## Frequently asked questions

### Is Calendar Busy Sync free?

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

### Is ProvenFlight free?

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

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

Neither Calendar Busy Sync nor ProvenFlight shows ads.

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

Calendar Busy Sync ships an update every 2 months, and ProvenFlight every 3 days. Most recently, Calendar Busy Sync was updated on October 7, 2026 and ProvenFlight 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.*