# PaulstraSoft vs Calotech

The clearest difference is update cadence: Calotech at every 2 months against PaulstraSoft's every 13 months. PaulstraSoft's advantage is iOS requirement (10.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PaulstraSoft ships an update every 13 months, Calotech every 2 months. The most recent releases landed on September 17, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | PaulstraSoft | Calotech |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 138 MB | 27 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HUTCHINSON](https://appshunter.io/developer/862345826) | [Calorie Fluor](https://appshunter.io/developer/1693605712) |

## What reviewers say

### PaulstraSoft

[App page](https://appshunter.io/ios/app/paulstrasoft/id1242874951)

This tool helps determine the right antivibration solution for machines by performing vibratory measurements. It offers functions for calculating attenuation, stops, and shock response, along with access to product datasheets.

**Highlights:** Vibratory measure, Vibratory attenuation calculation, Stops calculation, Shock response calculation, Product datasheet access

**Features:** macOS Compatibility

**In-app purchases:** none


### Calotech

[App page](https://appshunter.io/ios/app/calotech/id6450924301)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PaulstraSoft free?

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

### Is Calotech free?

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

### Do PaulstraSoft or Calotech have ads?

Neither PaulstraSoft nor Calotech shows ads.

### Which is updated more often, PaulstraSoft or Calotech?

PaulstraSoft ships an update every 13 months, and Calotech every 2 months. Most recently, PaulstraSoft was updated on September 17, 2026 and Calotech on October 15, 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.*