# Winter OPS — Your De-/Anti-Icing Helper > Aviation de-icing/anti-icing helper with holdover time calculations and SNOWTAM decoding. (iPhone/iPad app by Avimont GmbH.) - Source: https://appshunter.io/ios/app/winter-ops/id488881673 (this page in markdown: same URL + `.md`) - Developer: [Avimont GmbH](https://appshunter.io/developer/488879220) - Category: Weather, Utilities - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.0 · 65 MB - Languages: English - Released: 2012-01-10 - Data updated: 2026-09-12 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/winter-ops/id488881673/reviews.md ## What is Winter OPS? Winter OPS is an Application for De-/Anti-Icing & SNOWTAM Decoding. The data is based on the FAA, EASA and Transport Canada Holdover Time Guidelines for Winter 2025-2026 and are available through yearly subscriptions. Degree-specific Hold Overtimes are available if your operation allow their usage. According to the EASA Safety Information Bulletin SIB 2017-11 the FAA Holdover Time Guidelines are to be used instead of the previous AEA Guidelines. With Winter OPS you can not only easily find your hold over time, but also set an alarm to warn the approaching expiry of the HOT. With just one glance you get an overview what HOT other fluids would have, then choose the required or sprayed fluid to get your HOT. Find useful information such as qualified fluids, weather definitions, anti/de-icing definitions & application guidelines. Dark mode is supported and helps you not to ruin your night vision. Change the settings to meet your requirements. Terms of Use are available on: https://www.mr-apps.ch/wops/termsandconditions.html ********************************** Features: • FAA / EASA / Tranport Canada • Weather condition selection • Weather intensity selection • Flapsettings • Wingsurface • Precipitation Speed • Rotation Speed • Temperature setting (Slider / Buttons / °C / °F) • Fluid / Water Mixture selection • Fluid selection (incl. overview of all fluid HOTs) • HOT Display • Start Time settings (UTC / Device Time) • End Time settings (UTC / Device Time / Countdown) • Application Guidelines (1-Step / 2-Step / all Fluids / all Temperatures) • Qualified Fluids (lists the fluid names included by FAA or TC) • Weather Definitions • De-/Anti-Icing Terms & Definitions • E-Mail De-/Anti-Icing Information to OPS • Light & Dark Color Scheme (iOS 13+) • Warning Levels (Initial Warning / Last Warning / Expiry) • Individual Notification Settings • SNOWTAM Decode with Global Reporting Format • Snow Intensity / Visibility Decoder • iPad supports both orientations / iPhone only portrait. ********************************** If you find any mistakes in the program, please contact us at info@mr-apps.ch, we will then rectify the error immediately. We are also happy to integrate user requested new features. Some more Information you can find on our website: www.mr-apps.ch If you require a template for integration into your Winter OPS Guide, please contact me at info@mr-apps.ch, I will then send you the documentation. ********************************** NOTE: This Application reflects general recommendations only and local airworthiness agencies’ rulemaking and guidance as well as aircraft manufacturers’ documentation must always be followed. As individual icing situations or aeroplane types/models may require special procedures, this application can never replace the responsibility of the aeroplane operator’s judgement. The responsibility for the correct de-icing/anti-icing of aeroplanes always stays with the operator of the aeroplane. Although great care has been taken by the developer, errors or misprints can occur for which neither the developer nor the FAA/TC (information source) can be held liable. The developer or the FAA/TC (information source) do not accept liability for any damage, personal injury, death or any other negative effect that may result from the use of the information contained in this application as a whole or parts thereof. Anybody or any organisation using this application and the information contained therein does so at its own risk and responsibility and must check, among other things, for last update available. ## Key features - Holdover Time (HOT) calculations - SNOWTAM decoding - Customizable expiry time alerts - Qualified fluid information - Weather definitions - Dark mode support ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | 1 year generic Fluids (FAA) | $7.49 | per year | | 1 year all Fluids (FAA) | $12.49 | per year | | 1 year all Fluids (EASA) | $12.49 | per year | | 1 year generic Fluids (EASA) | $7.49 | per year | | 1 year all Fluids (TC) | $12.49 | per year | | 1 year generic Fluids (TC) | $7.49 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Decoder Enabling | $1.49 | one-time | ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/winter-ops/id488881673/reviews.md ### 1/5 — Decoder format is not what’s advertised. *2024-12-19* If you’re looking for a decoder that is in the same format as the preview then DON’T buy this app. **Developer response:** Apologies for your bad experience with our app. The shown SNOWTAM format is the old/previous regulation and is not used anymore. Our Application has changed to the new Global Reporting Format. We will check, why the old screenshots are still showing and correct them. The App-Details however state the correct Format (SNOWTAM GRF). ### 1/5 — Useless *2016-11-25* The holdover times are fluid specific. Therefore without the ability to specify the type of fluid by name, the times are completely meaningless and potentially very dangerous. Do NOT use this app. Look the data up in the published holdover times for the specific fluid used. Deleted the app as dangerous. Shame I can't get my money back. ## Frequently asked questions about Winter OPS ### What is Winter OPS used for? Winter OPS is an application designed to assist with de-icing and anti-icing procedures in aviation. It provides holdover time calculations based on FAA, EASA, and Transport Canada guidelines, and can also decode SNOWTAMs. ### What data sources does Winter OPS use for holdover times? The application's holdover time data is based on the FAA, EASA, and Transport Canada Holdover Time Guidelines for Winter 2025-2026. This ensures accuracy and compliance with current aviation regulations. ### Can Winter OPS alert me when holdover times are about to expire? Yes, Winter OPS allows you to set alarms to warn you about the approaching expiry of the Holdover Time (HOT). You can configure individual notification settings for warning levels. ### What subscription plans are available for Winter OPS? Winter OPS offers various yearly subscription plans, including options for generic fluids (EASA, TC, FAA) at $7.49/year with a 14-day free trial, and plans for all fluids (FAA, TC) at $12.49/year. ### Does Winter OPS support different temperature units? Yes, Winter OPS supports temperature settings in both Celsius (°C) and Fahrenheit (°F), with options to adjust using a slider or buttons. ### Is Winter OPS available on multiple devices? Winter OPS is available for iPhone and iPad, supporting both orientations on iPad and portrait mode on iPhone. It is also compatible with iPod. ### How often is Winter OPS updated? The application was last updated on October 1, 2025, with version 4.6.1. Updates are released to incorporate new features and rectify any reported mistakes. ### Does Winter OPS have ads? No, Winter OPS does not contain advertisements. The application is free to download and offers in-app purchases for subscription plans. ## Version history (last 5 releases) ### 5.0.0 — 2026-09-08 Winter OPS has been redesigned and improved for the next generation of winter operations: - Updated to the newest Holdver Time Guidlines for Winter 26/27 - Redesigned interface for a cleaner and more intuitive experience - Improved performance, stability and reliability Thank you for using Winter OPS. ### 4.6.1 — 2025-10-01 - Updated to the newest Holdover Time Guidelines for Winter 2025-2026. - Several Fluids have been added and removed. See full list in the update news. - Fluids applicable for allowance time have been specified by the authorities and several fluids were removed, as they were not validated at the time of the publishing of the new guidelines. - Review of the Transport Canada Snowfall intensity decoder - Several Improvements of the handling in the application (Weather selection and Snowfall intensity decoder) - Fixed an Issue with iPads and unjustified fluid warning ### 4.6.0 — 2025-10-01 - Updated to the newest Holdover Time Guidelines for Winter 2025-2026. - Several Fluids have been added and removed. See full list in the update news. - Fluids applicable for allowance time have been specified by the authorities and several fluids were removed, as they were not validated at the time of the publishing of the new guidelines. - Review of the Transport Canada Snowfall intensity decoder - Several Improvements of the handling in the application (Weather selection and Snowfall intensity decoder) ### 4.5.1 — 2025-02-04 The Moderate Freezing Drizzle Holdovertimes needed an adjustment to match the definition of the General Information for the Holdover Times. The changes have been performed for all Fluids generic SAE and specific. ### 4.5.0 — 2024-10-01 Holdovertimes Updated Holdover Times for Winter Season 2024-2025 WinterOPS has been brought to the newest regulations FAA/EASA and TC. HOT and DSHOT Updates have been done. Fluid Changes Addition of fluid ALAB International PROFLIGHT PG4 Addition of fluid Chongqing Joba Chemical Co., Ltd FW-IV Addition of fluid MKS DevO Chemicals COREICEPHOB TYPE-IV PG Addition of fluid Shaanxi Cleanway Cleansurface IV Addition of fluid Chongqing Joba Chemical Co.,Ltd FW-I Addition of fluid Newave Aerochemical Co. Ltd. FCY-1Bio+ (R) Removal of fluid Clariant Safewing MP II FLIGHT PLUS Removal of fluid JSC RCP Nordix Defrost PG 2 Removal of fluid All Clear ClearWing ECO Removal of fluid Clariant Max Flight AVIA Removal of fluid Clariant Max Flight SNEG Removal of fluid Clariang Safewing EG IV NORTH Removal of fluid Beijing Wangye Aviation Chemical Product Co Ltd. KLA-1 Removal of fluid Clariant Produkte (Deutschland) GmbH Octaflo LYOD Removal of fluid Clariant Produkte (Deutschland) GmbH Safewing EG I 1996 (88) Removal of fluid Clariant Produkte (Deutschland) GmbH Safewing MP I 1938 ECO Removal of fluid Clariant Produkte (Deutschland) GmbH Safewing MP I 1938 ECO (80) Premix 55% i.g. ready-to-use Removal of fluid Cryotech Deicing Technology Polar Plus® Removal of fluid Gansu xiexin huineng Science and technology development Co., Ltd. XHN-1 Restructuring of Allowance Times (see details below) Snow mixed with Freezing Fog has received its dedicated column for each fluid. For detailed updates, please refer to the official regulatory documents. DSHOT DSHOT updates to the newest regulations FAA/EASA and TC DSHOT have been extended to Snow mixed with Freezing Fog Allowance Time The Allowance Times have been updated with new values The authorities introduced a list of applicable fluids for allowance times. Meaning, there will be no allowance times anymore for the generic fluids. New weather categories have been introduced (the MEATR Codes are included in the selection list) As the intensity is irrelevant for allowance times, the selection buttons are hidden, when an Allowance Time weather has been selected. Future Plans Restructuring of the Database for better performance Improvements in the weather conditions selection Thank you for using Winter OPS ## Apps similar to Winter OPS | App | Rating | Price | Category | | --- | --- | --- | --- | | [Holdover Times Calculator](https://appshunter.io/ios/app/holdover-times-calculator/id6753866251) | — | Free | Weather | | [Safe Sky - Airside Sync](https://appshunter.io/ios/app/safe-sky-airside-sync/id1459357551) | — | Free | Weather | | [Holdover Calculator](https://appshunter.io/ios/app/holdover-calculator/id768019181) | — | Free | Weather | | [SITA eWAS for iPhone](https://appshunter.io/ios/app/sita-ewas-for-iphone/id1068135642) | 5.0 (5) | Free | Weather | | [SkyPath Pro](https://appshunter.io/ios/app/skypath-pro/id1504870778) | 4.1 (10) | Free | Weather | | [SITA eWAS](https://appshunter.io/ios/app/sita-ewas/id1005569119) | 4.1 (10) | Free | Weather | ## More apps by Avimont GmbH - [Winter OPS Generic 2023-24](https://appshunter.io/ios/app/winter-ops-generic-2023-24/id6468250435) - [Winter OPS All-Fluids 2023-24](https://appshunter.io/ios/app/winter-ops-all-fluids-2023-24/id6468251031) - [Winter OPS All-Fluids 2024-25](https://appshunter.io/ios/app/winter-ops-all-fluids-2024-25/id6723894858) - [Winter OPS Generic 2024-25](https://appshunter.io/ios/app/winter-ops-generic-2024-25/id6723896068) - [Winter OPS All-Fluids 2025-26](https://appshunter.io/ios/app/winter-ops-all-fluids-2025-26/id6753161814) All apps by Avimont GmbH: https://appshunter.io/developer/488879220 ## Related topics [cold weather ops](https://appshunter.io/ios/topics/cold-weather-ops) --- *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 2026-09-12.*