# SSC Spring Engineering vs Blacklist Datalog Viewer

The clearest difference is price: SSC Spring Engineering at Free against Blacklist Datalog Viewer's $3.99. SSC Spring Engineering also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). Blacklist Datalog Viewer's advantage is update cadence (every 2 weeks vs every 6 months). On ads and in-app purchases there is nothing between them.

SSC Spring Engineering is free to download; Blacklist Datalog Viewer costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SSC Spring Engineering ships an update every 6 months, Blacklist Datalog Viewer every 2 weeks. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SSC Spring Engineering | Blacklist Datalog Viewer |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.6 (28 ratings)](https://appshunter.io/ios/app/ssc-spring-engineering/id1438112209/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 38 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Service Spring Corporation](https://appshunter.io/developer/342694497) | [Dimitri Antona](https://appshunter.io/developer/6775074138) |

## What reviewers say

### SSC Spring Engineering

[App page](https://appshunter.io/ios/app/ssc-spring-engineering/id1438112209)

This utility app assists with spring engineering calculations, including conversions, new designs, and comparisons. It helps determine spring and drum specifications for various applications, such as rolling steel doors, and calculates lifting capacities.

**Highlights:** Spring conversion, New spring engineering, Drum specification comparison, IPPT spring calculation, Rolling steel door spring design, Approximate pull calculation, Maximum lift capacity determination

**Features:** macOS Compatibility

**In-app purchases:** none


### Blacklist Datalog Viewer

[App page](https://appshunter.io/ios/app/blacklist-datalog-viewer/id6775074136)

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

**In-app purchases:** none


## Frequently asked questions

### Is SSC Spring Engineering free?

SSC Spring Engineering is free to download, with no in-app purchases.

### Is Blacklist Datalog Viewer free?

Blacklist Datalog Viewer costs $3.99, with no in-app purchases.

### Do SSC Spring Engineering or Blacklist Datalog Viewer have ads?

Neither SSC Spring Engineering nor Blacklist Datalog Viewer shows ads.

### Which is updated more often, SSC Spring Engineering or Blacklist Datalog Viewer?

SSC Spring Engineering ships an update every 6 months, and Blacklist Datalog Viewer every 2 weeks. Most recently, SSC Spring Engineering was updated on October 24, 2026 and Blacklist Datalog Viewer on October 10, 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.*