# Big Brown ToolKit > A comprehensive aviation toolkit for aircrew calculations and data decoding. (iPhone/iPad app by Stealth Productions Limited.) - Source: https://appshunter.io/ios/app/big-brown-toolkit/id6475022221 (this page in markdown: same URL + `.md`) - Developer: [Stealth Productions Limited](https://appshunter.io/developer/571321895) - Category: Reference - Price: $4.99 - Rating: 5.00/5 from 6 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 24 MB - Languages: American English - Released: 2023-12-28 - Data updated: 2026-08-25 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/big-brown-toolkit/id6475022221/reviews.md ## What is Big Brown ToolKit? This ToolKit is intended to assist aircrew in their day to day activities. Features: • Domestic and International Duty Period calc • Required Rest calc • Common aviation unit conversion calc • Cross Wind and Cross Wind Limit calc • 8 digit Runway State decoder • SNOWTAM decoder • Crew Rest timing calc • Whose Segment random selector • Late Arrival Pay calc • Exchange Rate calc • Meteorological Decode • Low Temperature Altimetry calc • Density Altitude calc • Turn Rate/Radius calc • Generic volume/weight fuel calc • Sick Day Tracker • Linear and bilinear integration tool This ToolKit can calculate Domestic and International Duty Period limitations for the various types of operations. The Cross Wind calc can be used to determine cross wind and head/tail wind values for a given runway and wind direction/speed along with the maximum wind strength from the set wind direction for a given cross wind limit. The Runway State decoder can be used to quickly decode weather reports that may contain the standard 8-digit code. This can be useful for Moscow flights etc. The SNOWTAM tool will provide assistance in decoding standard GRF SNOWTAMs. The Meteorological Decode tool that will allow you to quickly decode significant present and forecast weather codes (i.e. +TSRA). The Last Pushback Time calc will calculate the required pushback time to allow you to achieve an on-blocks time inside your max FDP time taking into consideration sector time and taxi times. You will also be able to set a Notification to alert you that you have passed the Last Pushback Time. The Low Temperature Altimetry calc can be used to determine altitude corrections for MSA and approaches conducted in low temperatures. The MEL Rectification calc will provide the expiry date for a deferred defect given the DD entry date and the rectification interval category. The Linear and bilinear integration tool for those occasions where you have to use tables. ## Key features - Duty Period & Rest Calculations - Aviation Unit Conversions - Cross Wind & Runway State Decoding - SNOWTAM & Meteorological Decoding - Crew Rest & Pay Calculations - Low Temperature Altimetry & Density Altitude ## Chart rankings - #88 in Top Paid · Reference (US App Store) ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/big-brown-toolkit/id6475022221/reviews.md ### 5/5 — Amazing app *2024-05-29* Thank you for making this available. I love it and use it A LOT. I tell everyone about it but only iPhone users can have it. The others just wish they could. Maybe you’ll fix that? ## Frequently asked questions about Big Brown ToolKit ### What is Big Brown ToolKit used for? Big Brown ToolKit is designed to assist aircrew in their daily activities by providing a wide range of aviation-specific calculations and decoding tools. This includes duty period limitations, rest requirements, unit conversions, and weather report decoding. ### What types of calculations does Big Brown ToolKit offer? The toolkit offers calculations for domestic and international duty periods, required rest, common aviation units, crosswind and crosswind limits, crew rest timing, late arrival pay, exchange rates, low temperature altimetry, density altitude, turn rate/radius, and fuel volume/weight. ### Can Big Brown ToolKit decode weather reports? Yes, Big Brown ToolKit includes tools to decode 8-digit runway states, SNOWTAMs, and significant present and forecast meteorological codes. This helps aircrew quickly interpret crucial weather information. ### What devices is Big Brown ToolKit available on? Big Brown ToolKit is available for iPhone and iPod devices. It is rated for ages 4 and up. ### How much does Big Brown ToolKit cost? Big Brown ToolKit is a paid application, priced at $4.99. There are no in-app purchases or advertisements. ### How often is Big Brown ToolKit updated? The app was last updated on January 9, 2026, indicating a recent update. The latest version is 2.3. ### What is the user rating for Big Brown ToolKit? Big Brown ToolKit has a high user rating of 5.0 stars based on 6 ratings, suggesting a very positive user experience. ### Does Big Brown ToolKit have ads? No, Big Brown ToolKit does not contain advertisements. It is a paid application that offers a clean, ad-free experience for its users. ## Version history (last 5 releases) ### 2.3 — 2026-01-09 Update to 'Contact Times' tool ### 2.2 — 2026-01-07 Bug fix in new 'Contact Times' tool ### 2.1 — 2026-01-06 This version now contains a 'Contact Times' tool to enable calculation of when your required to respond to calls and when you are not to be contacted during layovers ### 1.28 — 2025-03-16 This version includes an updated Cross Wind Calculator that will store previously entered values to allow for quicker and easier recalculation of cross winds for the same runway. It also include minor big and performance fixes. ### 1.27 — 2024-11-07 - Bug fix to Domestic Duty Time calculator - Improved Cargo Position View ## More apps by Stealth Productions Limited - [CX ToolKit](https://appshunter.io/ios/app/cx-toolkit/id571321892) - [Pilot's Tool](https://appshunter.io/ios/app/pilots-tool/id580073334) - [Morse & Flags](https://appshunter.io/ios/app/morse-and-flags/id585570851) - [Santa Days to Go](https://appshunter.io/ios/app/santa-days-to-go/id597776625) - [Food Additives - Australia](https://appshunter.io/ios/app/food-additives-australia/id599403897) - [Elements Finder](https://appshunter.io/ios/app/elements-finder/id625720988) All apps by Stealth Productions Limited: https://appshunter.io/developer/571321895 --- *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 2026-08-25.*