# Flight Day/Night Calculator — Accurate Day/Night Flight Time > Accurate Day/Night Flight Time (iPhone/iPad app by Christopher Browne.) - Source: https://appshunter.io/ios/app/flight-daynight-calculator/id6751175138 (this page in markdown: same URL + `.md`) - Developer: [Christopher Browne](https://appshunter.io/developer/1833825731) - Category: Utilities, Business - Price: Free with in-app purchases (on sale, was $3.99) - Age rating: 4+ - Requires: iOS 16.0 · 62 MB - Languages: American English - Released: 2025-09-25 - Data updated: 2026-08-30 - User reviews in markdown: https://appshunter.io/ios/app/flight-daynight-calculator/id6751175138/reviews.md ## What is Flight Day/Night Calculator? Flight Day/Night Calculator is an offline UTC-based tool for calculating day and night flight time. Built by an airline pilot for pilots at every stage, from first night cross-country to long-range operations at high latitudes, it produces clear, repeatable results for logbook use. The core A-to-B calculation engine is fully available in the free tier. Optional Pro features add workflow tools and modelling refinements without changing the underlying calculation engine. Why This App? Accurate day/night splits are difficult to calculate precisely because the sun’s position changes continuously along a route, with boundaries shifting by latitude, season, routing, and timing. Flight Day/Night Calculator makes the process transparent and repeatable. Calculations and airport lookup work offline using an on-device airport database and embedded astronomy algorithms. No guesswork. No manual plotting. No sign-in. No data collection. Route Globe Route Globe provides an interactive 3D visualisation of your calculated flight, showing the route, aircraft position, day/night shading, and civil twilight throughout the flight. Free users can explore take-off, midpoint, landing, and civil twilight transitions. Pro unlocks the full timeline, allowing you to scrub through the flight or play it back over the globe. Route Globe visualises the same calculation and does not alter the underlying day/night results. How It Works The app computes aircraft position minute by minute using your departure, destination, and optional Pro waypoints. At each point it determines sun elevation and classifies day and night using the standard civil twilight definition: sun at or above −6°. Results are UTC-authoritative. Pro users can optionally enter times using manually selected UTC offsets. The app does not use automatic timezone or DST detection. Nautical twilight, astronomical twilight, and altitude-adjusted sunrise/sunset are available in Pro. Regulatory day/night totals remain based on civil twilight. Free includes: * Direct A-to-B day/night calculation * Minute-by-minute civil twilight classification * Great-circle routing * Route Globe snapshots at key points and civil twilight transitions * Offline airport search and lookup * Custom coordinate entry * Block time (OOOI) and airborne calculations * Distance and average groundspeed * Estimated Uncertainty * High-latitude cautions * Input validation * Full results display Pro adds: * Full Route Globe timeline and playback * Up to 20 waypoints * Waypoint ATA timing refinement * Local Time Entry using manual UTC offsets * Altitude-adjusted sunrise and sunset * Nautical and astronomical twilight * History access * Text and CSV export * Logbook notes options * Advanced twilight display controls Key Features * UTC-based calculations, results, and exports * Interactive 3D Route Globe * Offline airport database * Search by ICAO, IATA, local identifier, or name * Custom departure, arrival, and location coordinates * Detailed transition events with times and coordinates * Results in hours:minutes and decimal hours * Estimated Uncertainty for twilight sensitivity * Validation for implausible route and waypoint timing * Designed for iPhone and iPad, including Split View * Light and Dark Mode support Privacy & Offline Use Calculations, airport lookup, route processing, astronomy, results, and exports are performed on device. No account is required and the app does not collect personal data. Purchases, subscriptions, restores, and entitlement verification are handled through Apple StoreKit. Subscription & Purchase Information Pro is available as Monthly, Annual, or Lifetime access. Pricing is shown in-app and may vary by region. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel subscriptions in App Store settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Pro Monthly | $0.99 | per month | | Pro Annual | $4.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Pro Lifetime | $12.99 | one-time | ## Version history (last 5 releases) ### v2.2 — 2026-08-19 Route Globe arrives in v2.2. Visualise your calculated flight on an interactive 3D globe with your route, aircraft position, day/night shading, and civil twilight changing along the way. Free users can explore snapshots at take-off, midpoint, landing, and civil twilight transitions. Pro users can scrub through the full flight timeline or play the flight back over the globe. This release also includes improvements to Estimated Uncertainty, caution presentation, long-duration validation, coordinate entry, and iPhone/iPad reliability, along with an updated airport database using the latest available data. ### v2.1.1 — 2026-06-25 This update improves background reliability for in-progress calculations. Inputs are now preserved more consistently when the app is backgrounded, locked, suspended, or relaunched. Most users should not notice any visible change. To intentionally start a fresh calculation, use the Reset button. ### v2.1 — 2026-06-16 New & Improved: * Improved Local Time Entry with clearer manual UTC offset handling, including date-boundary and non-integer offset cases. * Improved input preservation when returning after backgrounding, device lock, or app switching. * Added stronger validation for unrealistic groundspeeds and waypoint ATA timing. * Improved coordinate-entry keyboard behaviour for waypoints and custom locations. * Refined light-mode readability, card contrast, Location Lookup messaging, and iPad/Split View presentation. * Fixed custom airport summary alignment and made other UI polish and reliability improvements. * Updated Airport DB to latest version. ### v2.0 — 2026-04-11 New & Improved: - Introduced a new Free tier with full access to the core day/night calculation engine, including airport lookup and uncertainty analysis. - Added optional Pro features available via subscription or lifetime purchase, including waypoint routing, local time entry, altitude-adjusted sunrise/sunset, export tools, and History. - Existing users who purchased the app prior to v2.0 are automatically granted lifetime Pro access (Early Supporter). Thank you for your support. - Updated airport database with the latest available data. - Minor UI refinements and internal improvements. ### v1.6 — 2026-02-13 New & Improved: - Introduced Estimated Uncertainty for day/night results, including input-geometry and model components. - Replaced generic precision estimates with a detailed per-flight uncertainty calculation, without changing the core day/night solver. - Minor UI refinements and internal improvements. As always, all calculations remain fully offline and UTC-authoritative, producing consistent and auditable results suitable for accurate logbook use. ## Apps similar to Flight Day/Night Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [myanywAiR Next](https://appshunter.io/ios/app/myanywair-next/id6448673464) | — | Free | Utilities | | [Govt.nz](https://appshunter.io/ios/app/govtnz/id6751522311) | — | Free | Utilities | | [Eye Measure-Ruler&,Distance,PD](https://appshunter.io/ios/app/eye-measure-ruler-and-distancepd/id6753977204) | 4.5 (15) | Free | Utilities | | [GPT.Zero: AI Undetectable Tool](https://appshunter.io/ios/app/gptzero-ai-undetectable-tool/id6756034715) | 4.8 (29) | Free | Utilities | | [Aviation Fuel converter](https://appshunter.io/ios/app/aviation-fuel-converter/id6502164398) | — | Free | Utilities | | [Hivepass](https://appshunter.io/ios/app/hivepass/id1573527302) | — | Free | Utilities | ## Related topics [civil twilight calculator](https://appshunter.io/ios/topics/civil-twilight-calculator) --- *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 2026-08-30.*