# Fastener Calc vs SkillMap

The clearest difference is price: SkillMap at Free against Fastener Calc's $2.99. SkillMap also leads on update cadence (every 9 days vs every 4 months). Fastener Calc's advantage is in-app purchases (none vs 4) and iOS requirement (8.0 vs 26.0). On ads and device support there is nothing between them.

SkillMap is free to download; Fastener Calc costs $2.99 up front. SkillMap sells 4 in-app purchases, starting at $3.99 per 7 days. Fastener Calc asks for nothing beyond the download.

Fastener Calc ships an update every 4 months, SkillMap every 9 days. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Fastener Calc | SkillMap |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | Paid | — |
| Size | 8 MB | 21 MB |
| Requires iOS | **8.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bossard AG](https://appshunter.io/developer/388420107) | [海坤 孟](https://appshunter.io/developer/1787009679) |

## 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


### SkillMap

[App page](https://appshunter.io/ios/app/skillmap-ai-roadmap/id6747281253)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $3.99 | per 7 days |
| Monthly Subscription | $9.99 | per month |
| Annually Subscription | $29.99 | per year |
| VIP Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Fastener Calc free?

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

### Is SkillMap free?

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

### Do Fastener Calc or SkillMap have ads?

Neither Fastener Calc nor SkillMap shows ads.

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

Fastener Calc ships an update every 4 months, and SkillMap every 9 days. Most recently, Fastener Calc was updated on October 3, 2026 and SkillMap on October 5, 2026.

---

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