# BoltSpec Pro vs Process Engineer Calc

The clearest difference is price: Process Engineer Calc at Free against BoltSpec Pro's $1.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Process Engineer Calc is free to download; BoltSpec Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | BoltSpec Pro | Process Engineer Calc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 10 days |
| Size | 2 MB | 11 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Qixin Net (Beijing) Technology Co., Ltd.](https://appshunter.io/developer/1886626064) | [冯泰 蔡](https://appshunter.io/developer/1896641064) |

## What reviewers say

### BoltSpec Pro

[App page](https://appshunter.io/ios/app/boltspec-pro/id6762735091)

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

**In-app purchases:** none


### Process Engineer Calc

[App page](https://appshunter.io/ios/app/process-engineer-calc-lms/id6774295442)

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

**In-app purchases:** none


## Frequently asked questions

### Is BoltSpec Pro free?

BoltSpec Pro costs $1.99, with no in-app purchases.

### Is Process Engineer Calc free?

Process Engineer Calc is free to download, with no in-app purchases.

### Do BoltSpec Pro or Process Engineer Calc have ads?

Neither BoltSpec Pro nor Process Engineer Calc shows ads.

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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.*