# BD-Engine

> BD-Engine (iPhone/iPad app by Shenzhen Rierxing Electronics Co., Ltd.)

- Source: https://appshunter.io/ios/app/bd-engine/id6773223585 (this page in markdown: same URL + `.md`)
- Developer: [Shenzhen Rierxing Electronics Co., Ltd](https://appshunter.io/developer/6773068820)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.6 · 18 MB
- Languages: English
- Released: 2026-06-05
- Data updated: 2026-09-12
- User reviews in markdown: https://appshunter.io/ios/app/bd-engine/id6773223585/reviews.md

## What is BD?

App Name: BD-Engine

Subtitle: Wireless Ballistic Calculator

Description:

BD-Engine is a professional ballistic calculator that connects wirelessly to the BD-Engine hardware module via Bluetooth Low Energy, delivering real-time, high-precision trajectory computation.

Built for precision shooters, BD-Engine provides fast and accurate firing solutions with the power of a dedicated solver and the simplicity of a mobile app.

Key Features:

Instant Wireless Pairing — Connect to the BD-Engine module over BLE in seconds. Auto-reconnect remembers your last device.
3DOF Ballistic Solver — Advanced three-degree-of-freedom trajectory computation for accuracy at any range.
G1 & G7 Drag Models — Supports both industry-standard drag functions for precise bullet matching across all common calibers.
Full Environment Setup — Temperature, pressure, humidity, altitude, wind speed and direction, shooting angle, and muzzle cant — all at your fingertips.
Real-Time Trajectory Table — View drop, windage, velocity, and time-of-flight at every range increment. Verify your zero with a dedicated check distance.
Custom Bullet Profiles — Configure caliber, weight, ballistic coefficient, and twist rate for your exact load.
Dual Unit System — Toggle between metric and imperial units on the fly.
Standalone Operation — Once configured, the hardware module computes trajectories independently — no phone required for firing solutions.
BD-Engine combines dedicated ballistic hardware with an intuitive iPhone interface for shooters who demand precision.

Note: Requires a device equipped with the BD-Engine BLE hardware module (sold separately).


## Version history (last 2 releases)

### 2.0.2 — 2026-09-09

New "Verify" feature for instant single-distance solutions,Fixed keyboard dismissal issue on the Verify screen,Improved stability and performance.

### 1.2.0 — 2026-06-06

No release notes.

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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 2026-09-12.*