# SDT Calculator 速距時計算機

> SDT Calculator 速距時計算機 (iPhone/iPad app by Lap Tak Cheung.)

- Source: https://appshunter.io/ios/app/sdt-calculator/id6767132226 (this page in markdown: same URL + `.md`)
- Developer: [Lap Tak Cheung](https://appshunter.io/developer/557168864)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 18.6 · 14 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-05-07
- Data updated: 2026-06-01
- User reviews in markdown: https://appshunter.io/ios/app/sdt-calculator/id6767132226/reviews.md

## What is SDT Calculator 速距時計算機?

SDT Calculator — Speed, Distance & Time, but smoother

Stuck between speed, time, and distance? SDT Calculator solves it instantly as you enter values. Watch a real‑time parallax visualizer respond to your inputs – making rate problems feel effortless. Switch seamlessly between metric and imperial, including knots for aviation and maritime use. Perfect for students, runners, drivers, pilots, and crew.


## Version history (last 5 releases)

### 1.0.6 — 2026-05-15

+ Added navigation and beacon lights to the airplane in dark mode to ensure flight safety

### 1.0.5 — 2026-05-14

+ Added yard and yard/second
+ Interface enhancements

### 1.0.4 — 2026-05-13

+ Added Mach speed unit
# Visualizers enhancements

### 1.0.3 — 2026-05-12

+ Added runner and cyclist visualizers
+ Added real-time unit conversions
# Interface improvements
# For safety reason, measurement balloons are restricted from flying above the aircraft’s altitude.

### 1.0.2 — 2026-05-10

# Units can be switched to perform real-time conversions
# Visual improvements

## More apps by Lap Tak Cheung

- [Legislation HK 香港法例](https://appshunter.io/ios/app/legislation-hk/id557168861)
- [擇改易 HK](https://appshunter.io/ios/app/hk/id568034553)
- [Basic Law HK 香港基本法](https://appshunter.io/ios/app/basic-law-hk/id742545977)
- [Tunnel Tolls HK 香港隧道收費](https://appshunter.io/ios/app/tunnel-tolls-hk/id6741419041)

All apps by Lap Tak Cheung: https://appshunter.io/developer/557168864

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*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 2026-06-01.*