# QuickColdAlt vs Manual Sync

The clearest difference is in-app purchases: QuickColdAlt at none against Manual Sync's 2. Manual Sync's advantage is update cadence (every 2 days vs every 11 days). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Manual Sync sells 2 in-app purchases, starting at $9.99 per year. QuickColdAlt asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for QuickColdAlt against 5.0 for Manual Sync. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

QuickColdAlt ships an update every 11 days, Manual Sync every 2 days. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | QuickColdAlt | Manual Sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/quickcoldalt/id6739363484/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/manual-sync/id6763876582/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 2 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 40 MB | 2 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SEUNGSOO YOU](https://appshunter.io/developer/1785034668) | [AeroSync Studio](https://appshunter.io/developer/1888070954) |

## What reviewers say

### QuickColdAlt

[App page](https://appshunter.io/ios/app/quickcoldalt/id6739363484)

This utility calculates temperature and altitude corrections for flight operations. It offers a user-friendly interface for quick and reliable results, with a dark mode ideal for night flying. The app is completely free and ad-free.

**Highlights:** Temperature and altitude correction calculation, User-friendly interface, Fast results (under 10 seconds), Clear and reliable display, Dark mode for night flights, Completely free and ad-free

**Features:** macOS Compatibility

**In-app purchases:** none


### Manual Sync

[App page](https://appshunter.io/ios/app/manual-sync/id6763876582)

Easily transfer annotations and bookmarks between PDF documents. This tool uses precise matching for professionals who update manuals frequently, ensuring notes stay in place. All processing is done locally for enhanced privacy.

**Highlights:** Smart word-based annotation matching, Bookmark hierarchy migration, Split-view manual review, Local device processing, Annual and lifetime subscription options

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ManualSync Annual Premium | $9.99 | per year |
| ManualSync Annual Premium | $24.99 | one-time |


## Frequently asked questions

### Is QuickColdAlt free?

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

### Is Manual Sync free?

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

### Which has better reviews, QuickColdAlt or Manual Sync?

QuickColdAlt and Manual Sync are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do QuickColdAlt or Manual Sync have ads?

Neither QuickColdAlt nor Manual Sync shows ads.

### Which is updated more often, QuickColdAlt or Manual Sync?

QuickColdAlt ships an update every 11 days, and Manual Sync every 2 days. Most recently, QuickColdAlt was updated on October 9, 2026 and Manual Sync on October 3, 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.*