QuickColdAlt vs Manual Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
QuickColdAlt
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.
- 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
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**QuickColdAlt: The ultimate Cold Temperature Altitude Correction Calculator designed by an Airline Pilot.** - **Fast and Easy:** Calculate corrections in under 10 seconds with a simple and user-friendly interface. - **Clear and Reliable:** Accurate results are clearly displayed for your confidence. - **Perfect for Night Flights:** The default dark mode reduces eye strain, making it ideal for night operations. - **Always Free:** No cost, no ads—use it anytime, anywhere with peace of mind. With **QuickColdAlt**, save time, fly safer, and simplify your workflow. Download now and experience the difference! ( The airport data provided within the app serves as reference data only. If needed, it is recommended to manually input the desired airport elevation value. ) Visit our official website for more information : www.redswansoft.com App Credits & Licenses This app integrates various libraries and resources to deliver its features efficiently. The following libraries and resources are used: • mwgg/Airports: A JSON database of airports, provided under the MIT License. • Ionicons: Icons provided under the MIT License. • FontAwesome: Free icons provided under the Font Awesome Free License. • Google Fonts: Fonts provided under the Open Font License (OFL). Licenses This app complies with the licensing requirements of each resource. For example: • MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of the software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. The software is provided “as is”, without warranty of any kind. • Open Font License (OFL) The fonts used in this app are free to use and distribute as long as they are not sold by themselves. Acknowledgment We deeply appreciate the creators and maintainers of these open-source libraries for enabling us to build a better app experience.
Manual Sync
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.
- Smart word-based annotation matching
- Bookmark hierarchy migration
- Split-view manual review
- Local device processing
- Annual and lifetime subscription options
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ManualSync: Effortless PDF Revision Assistant Seamlessly transfer your annotations and bookmarks to revised PDF manuals in seconds. Designed for professionals who handle frequent document updates, ManualSync uses high-precision matching to ensure your notes land exactly where they belong. Key Features: Smart word-based annotation matching Bookmark hierarchy migration Split-view manual review Privacy First: All processing happens locally on your device. Your manuals never leave your side. [Subscription Information] • ManualSync Annual Premium: $9.99/year (Includes a 3-day free trial) • ManualSync Lifetime Access: $24.99 (One-time purchase) [Payments and Renewal] • Payment will be charged to your iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. • Your account will be charged for renewal within 24-hours prior to the end of the current period. • You can manage or turn off auto-renew in your Apple ID Account settings at any time after purchase. • No cancellation of the current subscription is allowed during the active period. • Terms of Use (Standard Apple EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ • Privacy Policy: https://aerosyncstudio.kr/privacy-manualsync.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | QuickColdAlt | Manual Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 11 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.4 — better | 17.6 |
| Further details — not scored | ||
| Size | 40 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | SEUNGSOO YOU | AeroSync Studio |
Customer experience
QuickColdAlt
Manual Sync
In-app purchases
QuickColdAlt
No in-app purchases
Manual Sync
- ManualSync Annual Premium$9.991 Year
- ManualSync Annual Premium$24.99









