# Fastener Calc vs alkitronic

The clearest difference is price: alkitronic at Free against Fastener Calc's $2.99. Fastener Calc's advantage is iOS requirement (8.0 vs 15.5). On update cadence, ads, in-app purchases and device support there is nothing between them.

alkitronic is free to download; Fastener Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Fastener Calc ships an update every 4 months, alkitronic every 2 months. The most recent releases landed on October 20, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Fastener Calc | alkitronic |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/fastener-calc/id388420104/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 8 MB | 82 MB |
| Requires iOS | **8.0** | 15.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bossard AG](https://appshunter.io/developer/388420107) | [alki Technik GmbH Schraubsysteme Entwicklung-Produktion-Vertrieb](https://appshunter.io/developer/1557464794) |

## What reviewers say

### Fastener Calc

[App page](https://appshunter.io/ios/app/fastener-calc/id388420104)

This app provides engineers, technicians, and students with essential tools for bolted joint development. It includes converters for various units and geometrical and mechanical calculators for dimensioning and design in joining technology.

**Highlights:** Unit converters (length, torque, pressure, force), Metric-imperial fastener conversion, Drill hole size calculator, Tapping screw pilot hole design, Bolt size and property class estimation, Disc spring calculator, Thread engagement length calculator

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

**In-app purchases:** none


### alkitronic

[App page](https://appshunter.io/ios/app/alkitronic/id1121341999)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fastener Calc free?

Fastener Calc costs $2.99, with no in-app purchases.

### Is alkitronic free?

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

### Do Fastener Calc or alkitronic have ads?

Neither Fastener Calc nor alkitronic shows ads.

### Which is updated more often, Fastener Calc or alkitronic?

Fastener Calc ships an update every 4 months, and alkitronic every 2 months. Most recently, Fastener Calc was updated on October 20, 2026 and alkitronic on October 21, 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.*