# BITEKEEPER vs NDT Master

The clearest difference is in-app purchases: BITEKEEPER at none against NDT Master's 1. BITEKEEPER also leads on iOS requirement (13 vs 15). NDT Master's advantage is update cadence (every 2 weeks vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. NDT Master sells 1 one-off in-app purchase. BITEKEEPER asks for nothing beyond the download.

BITEKEEPER ships an update monthly, NDT Master every 2 weeks. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | BITEKEEPER | NDT Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/ndt-master-ut-weld-calculator/id6762549446/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 103 MB | 20 MB |
| Requires iOS | **13** | 15 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ningbo Pelican Drone Co., Ltd.](https://appshunter.io/developer/1263327110) | [雪 蔺](https://appshunter.io/developer/1853712836) |

## What reviewers say

### BITEKEEPER

[App page](https://appshunter.io/ios/app/bitekeeper/id6446575805)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


### NDT Master

[App page](https://appshunter.io/ios/app/ndt-master-ut-weld-calculator/id6762549446)

This app streamlines ultrasonic testing for field inspections. It offers rapid weld rating, DAC/TCG curve building, 3D beam simulation, and OCR parameter capture. Includes essential UT calculators and material presets for efficient flaw detection and setup confidence.

**Highlights:** AWS D-Rating in 5 Seconds, DAC/TCG Curve Building, 3D Beam Simulation, OCR Parameter Capture, 9 UT Calculators, Offline-First Workflow

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional Unlock | $9.99 | one-time |


## Frequently asked questions

### Is BITEKEEPER free?

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

### Is NDT Master free?

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

### Do BITEKEEPER or NDT Master have ads?

Neither BITEKEEPER nor NDT Master shows ads.

### Which is updated more often, BITEKEEPER or NDT Master?

BITEKEEPER ships an update monthly, and NDT Master every 2 weeks. Most recently, BITEKEEPER was updated on November 7, 2026 and NDT Master on November 5, 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.*