# Holdover Pro > Aircraft de-icing holdover time tables and timer with real-time weather integration. (iPhone/iPad app by Kármán Logs LLC.) - Source: https://appshunter.io/ios/app/holdover-pro/id6817830141 (this page in markdown: same URL + `.md`) - Developer: [Kármán Logs LLC](https://appshunter.io/developer/1887917930) - Category: Weather - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 12 MB - Languages: English - Released: 2026-10-23 - Data updated: 2026-10-26 - Monetization: free with in-app purchases ## What is Holdover Pro? Holdover Pro puts the FAA and Transport Canada holdover time tables and a holdover timer on your iPad and iPhone. Choose the airport, or let the app find the nearest one, and pick your fluid. Holdover Pro reads the newest METAR or D-ATIS, works out the precipitation and the snowfall intensity, and finds the cell in the FAA or Transport Canada Holdover Time Guidelines, whichever your aircraft uses, for your fluid, dilution and outside air temperature. It shows you the official table with that cell highlighted, so you can check the answer at a glance. When fluid application begins, start the clock. THE LOOKUP • FAA and Transport Canada Holdover Time Guidelines, Winter 2026-2027: Type I, II, III and IV fluids, generic and brand-specific • FAA or Transport Canada tables chosen for each aircraft; Canadian registrations start on Transport Canada • Active frost, allowance times for ice pellets and small hail, and lowest operational use temperature (LOUT) tables • Snowfall intensity from visibility (Table 57), with day or night worked out from the sun at your airport • The newest METAR or D-ATIS for the nearest airport, or enter the weather by hand • Tables in the colors of the printed guidelines with the cell used highlighted, and the reason when no holdover time applies • Checks for revised tables and installs them after verifying them, and warns you when the tables in use are out of date THE TIMER • Green, amber and red countdown from the start of fluid application to the lower and upper holdover times • Alerts before the lower time, and on iOS 26 alarms that sound even in silent mode • Live Activity on the Lock Screen and in the Dynamic Island, plus Home Screen and Lock Screen widgets • Rechecks the weather every 5 minutes while the clock runs and tells you when the conditions change • Airborne detection with GPS and the barometer • Contamination check and second de-icing steps, with room for your operator's own items YOUR AIRCRAFT AND RECORDS • Add an aircraft by tail number: for US aircraft the FAA registry fills in the type, and the holdover rules are prefilled for you to verify • Every holdover is saved as a trip record with the weather, the table set and the chart used SEASON PASS The holdover timer needs a Season Pass, free for the first 7 days and then billed yearly. It renews automatically unless cancelled at least 24 hours before the end of the trial or the current period. Manage or cancel it in your Apple Account settings. The Season Pass pays for the new FAA and Transport Canada tables every August. IMPORTANT Holdover Pro is a reference aid for trained flight crews. It is not approved by the FAA, Transport Canada or any other authority, and it never authorizes a takeoff. Holdover times are estimates. The official FAA or Transport Canada Holdover Time Guidelines your operator's program requires, your operator's approved ground deicing and anti-icing program and the pre-takeoff contamination check always govern, and the pilot in command makes every decision. Terms of Use: https://www.karmanlogs.com/holdover-pro/terms Privacy Policy: https://www.karmanlogs.com/holdover-pro/privacy Made by KármánLogs LLC. ## Key features - FAA/Transport Canada holdover time tables - Automatic weather data integration (METAR/D-ATIS) - Precipitation and snowfall intensity calculation - Highlighted table cells for quick reference - Visual countdown timer with alerts - Live Activity and widget support - Aircraft record saving ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Season Pass | $19.99 | per year | ## Is Holdover Pro safe? Not enough ratings yet to assess Holdover Pro. ## Is Holdover Pro legit? Holdover Pro has limited verification signals. The AppsHunter Legitimacy Score for Holdover Pro is 55 out of 100 points across 7 verification signals from App Store and developer data. ## Frequently asked questions about Holdover Pro ### What is Holdover Pro? Holdover Pro is a reference aid for trained flight crews that provides FAA and Transport Canada holdover time tables and a holdover timer for aircraft de-icing. It integrates real-time weather data to assist in determining appropriate de-icing procedures. ### Does Holdover Pro have ads? The provided data does not indicate the presence of advertisements within Holdover Pro. Its monetization model is based on a subscription for the Season Pass. ### How does Holdover Pro calculate holdover times? Holdover Pro reads the newest METAR or D-ATIS, calculates precipitation and snowfall intensity, and then finds the relevant cell in the FAA or Transport Canada Holdover Time Guidelines based on your selected fluid, dilution, and outside air temperature. ### What are the subscription details for Holdover Pro? Holdover Pro requires a Season Pass, which is free for the first 7 days and then billed yearly at $19.99. This pass provides access to updated FAA and Transport Canada tables. The subscription renews automatically unless cancelled at least 24 hours before the end of the trial or current period. ### Is Holdover Pro approved by aviation authorities? No, Holdover Pro is a reference aid and is not approved by the FAA, Transport Canada, or any other authority. It does not authorize takeoff, and official guidelines and pre-takeoff checks always govern. ### How often are the holdover tables updated in Holdover Pro? The Season Pass provides access to new FAA and Transport Canada tables every August. The app also checks for revised tables and installs them after verification, warning users when the tables in use are out of date. ### What devices is Holdover Pro available on? Holdover Pro is available on iPad and iPhone devices. It features Live Activity on the Lock Screen and in the Dynamic Island, as well as Home Screen and Lock Screen widgets. ### What is the age rating for Holdover Pro? Holdover Pro has an age rating of 4+. This indicates it is suitable for a general audience and does not contain content typically considered inappropriate for children. ## Version history (last 1 release) ### 2026.15 — 2026-10-23 No release notes. ## More apps by Kármán Logs LLC - [Kármán Logs: Pilot Logbook](https://appshunter.io/ios/app/karman-logs-pilot-logbook/id6761129566) - [G700 - Limitations](https://appshunter.io/ios/app/g700-limitations/id6799834521) All apps by Kármán Logs LLC: https://appshunter.io/developer/1887917930 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-26.*