# Drift vs BD

The clearest difference is in-app purchases: BD at none against Drift's 1. BD also leads on iOS requirement (15.6 vs 26.0). Drift's advantage is update cadence (every 10 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Drift sells 1 one-off in-app purchase. BD asks for nothing beyond the download.

Drift ships an update every 10 days, BD every 3 months. Both last shipped on September 12, 2026.

## The numbers

| Metric | Drift | BD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (9 ratings)](https://appshunter.io/ios/app/drift-ballistics-calculator/id6759738029/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 months |
| Monetization | Free | — |
| Size | 14 MB | 18 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bolze, LLC](https://appshunter.io/developer/1073511778) | [Shenzhen Rierxing Electronics Co., Ltd](https://appshunter.io/developer/6773068820) |

## What reviewers say

### Drift

[App page](https://appshunter.io/ios/app/drift-ballistics-calculator/id6759738029)

This app provides precise long-range shooting calculations, including windage and elevation adjustments. It offers a vast database of ammunition and rifle configurations, with offline functionality and local data storage for privacy.

**Highlights:** 1,300+ bullets and 600+ factory loads, RK4 point-mass solver with G1/G7 drag models, Spin drift, Coriolis, and aerodynamic jump corrections, Range cards with smart intervals, Wind compass with clock-face input, Atmospheric auto-population from sensors, Offline-first operation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Drift Pro | $14.99 | one-time |


### BD

[App page](https://appshunter.io/ios/app/bd-engine/id6773223585)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Drift free?

Drift is free to download, with in-app purchases available.

### Is BD free?

BD is free to download, with no in-app purchases.

### Do Drift or BD have ads?

Neither Drift nor BD shows ads.

### Which is updated more often, Drift or BD?

Drift ships an update every 10 days, and BD every 3 months. Most recently, Drift was updated on September 12, 2026 and BD on September 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*