# 3-Level > Production tool for time, dates, calculations, and ICAO codes with notes. (iPhone/iPad app by Daniel Hegar.) - Source: https://appshunter.io/ios/app/3-level/id590359205 (this page in markdown: same URL + `.md`) - Developer: [Daniel Hegar](https://appshunter.io/developer/590359208) - Category: Utilities, Productivity - Price: $1.99 - Rating: 4.80/5 from 15 App Store ratings · 15 written reviews indexed - Age rating: 4+ - Requires: iOS 11.0 · 9 MB - Languages: American English - Released: 2013-01-06 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/3-level/id590359205/reviews.md ## What is 3? 3-Level is a production tool that is designed to help knock out those menial everyday tasks....just like all 3-levels. -Displays zulu time and date -Displays local time and date -Provides a quick "Pre-Flight" due calculator that display the expiration date in local time. -Provides a list of many common ICAOs along with their name. -Allows users to add notes to stations for future reference. -Conversions Tab with a whole slew of useful tools. ## Key features - Zulu and local time/date display - Pre-flight due date calculator - List of common ICAO codes - Add notes to stations - Conversion tools ## Recent user reviews (10 of 15) All indexed reviews: https://appshunter.io/ios/app/3-level/id590359205/reviews.md ### 4/5 — Amazing app - Outdated though *2024-12-07* I use this app daily, however with my new iOS there is no longer a widget for my home screen. Would be super nice if you updated the widget to reflect on the new iOS. I still tell all my 3 speeds to get this app. ### 4/5 — Great app. Just one question! *2023-07-24* Great app. It helps me out with some things but my preflight calculator text seems to be too big. The day shows up but not the times. Anyone else have this problem? ### 5/5 — Exactly what I need *2019-12-09* Awesome app, man. I recommend it to anyone who asks. If it could add a Julian date on my watch, it’d be everything I could ask for. ### 5/5 — Why *2018-10-31* Why do I got to pay for this app now. My airman don’t want to pay for it now 😭 ### 5/5 — C2A5X4 *2016-06-22* Using this at Kadena AB. Was recommended by a friend. Very useful on TDYs. Emailed them a while ago about having conversions and they listened. I recommend this to all that travel to various bases. ### 4/5 — 2R1 *2015-01-11* Looks legit, always looking for Julian dates in PS&D. JBER, AK. ### 3/5 — Very helpful *2014-09-15* Using this at Dover AFB , as an Fcc this is helpful!! ### 5/5 — Awesome app *2014-08-12* Currently performing crew chump work en route and this app has helped me out a few times. Some feed back would be in the conversion area maybe add a conversion from pounds of JP-8 to gallons. ### 5/5 — Thank you *2014-08-07* This app has made my job easier, thank you. Update - great job on the new update. Appreciate all your hard work. Your supervisor must be proud. 728 AMS will get Update #2 - 728 AMS will get some use out of this app. This app helps me attack all the work I see. Thx ### 4/5 — Julian *2014-05-29* Great app but only issue is that it shows the Julian date in local and not Zulu. Is there a sitting to change that ? ## Frequently asked questions about 3 ### What is 3-Level? 3-Level is a production tool designed to help with everyday tasks. It displays Zulu and local time/date, calculates expiration dates, and provides a list of common ICAO codes with the ability to add notes. ### Does 3-Level have ads? No, 3-Level does not contain advertisements. It is a paid application with no ads. ### What devices does 3-Level support? 3-Level is supported on iPhone and iPod devices. ### What is the age rating for 3-Level? 3-Level has an age rating of 4+, making it suitable for a wide range of users. ### How often is 3-Level updated? The latest version of 3-Level is 2.2.2, which was last updated on April 18, 2021. Future updates may be released by the developer. ### What is the price of 3-Level? 3-Level is available for a one-time purchase of $1.99. ### What kind of conversions does 3-Level offer? 3-Level includes a 'Conversions Tab' with a variety of useful tools for different conversion needs. ### What do users like about 3-Level? Users appreciate 3-Level's functionality and utility, as reflected in its high rating of 4.8 stars from 15 ratings. ## Version history (last 5 releases) ### 2.2.2 — 2021-04-18 A quick bug-fix for the 14-day preflight calculation. ### 2.2.1 — 2020-06-29 - Added better UI constraints to accommodate several different devices. ### 2.2 — 2020-06-27 A quick update to fix a layout issue on iPhone 8 devices. ### 2.1 — 2020-05-31 - Added the 14-Day Preflight expiration time ### 2.0 — 2019-11-29 - Added widget - Added a Fuel weight/quantity calculator - Added support for dark mode ## Apps similar to 3 | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sweep & Zone](https://appshunter.io/ios/app/sweep-and-zone/id1590930048) | 5.0 (19) | Free | Utilities | | [HLL Artillery Calculator](https://appshunter.io/ios/app/hll-artillery-calculator/id1595749542) | 5.0 (10) | $0.99 | Utilities | | [KC-135 Duty Day Calc](https://appshunter.io/ios/app/kc-135-duty-day-calc/id986551768) | 5.0 (1) | $0.99 | Utilities | | [Yellow Book](https://appshunter.io/ios/app/yellow-book/id520715004) | 4.2 (13) | Free | Utilities | | [Boingo for Military](https://appshunter.io/ios/app/boingo-for-military/id1570819268) | 1.3 (499) | Free | Utilities | | [USFK Bus](https://appshunter.io/ios/app/usfk-bus/id1634145837) | 4.0 (1) | Free | Utilities | --- *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 2026-06-10.*