# SSC Spring Engineering vs TB Logic

The clearest difference is review sentiment: TB Logic at 100% against SSC Spring Engineering's 50%. TB Logic also leads on update cadence (weekly vs every 6 months) and rating (5.0 vs 4.6). SSC Spring Engineering's advantage is in-app purchases (none vs 2) and ratings volume (26 vs 4). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. TB Logic sells 2 in-app purchases, starting at $5.99 per month. SSC Spring Engineering asks for nothing beyond the download.

TB Logic holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: SSC Spring Engineering has 26 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of SSC Spring Engineering's written reviews are positive against 100% of TB Logic's.

SSC Spring Engineering ships an update every 6 months, TB Logic weekly. The most recent releases landed on September 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SSC Spring Engineering | TB Logic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (26 ratings)](https://appshunter.io/ios/app/ssc-spring-engineering/id1438112209/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/tb-logic/id6783934469/reviews)** |
| Number of ratings | **26** | 4 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 38 MB | 49 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Service Spring Corporation](https://appshunter.io/developer/342694497) | [Chill Inc](https://appshunter.io/developer/6783934471) |

## 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


### TB Logic

[App page](https://appshunter.io/ios/app/tb-logic/id6783934469)

This construction calculator offers essential tools for framers, concrete crews, and GCs. It provides feet-inch-fraction math and a tap-to-reuse running tape. A Pro version unlocks smart formulas, AI chat for jobsite math, and the ability to save and share work.

**Highlights:** Feet-inch-fraction math, Tap-to-reuse running tape, Smart construction formulas, AI jobsite math chat, Save and share work, Bilingual support (English/Spanish)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tool Belt Logic Pro | $5.99 | per month |
| Tool Belt Logic Pro (Yearly) | $65.99 | per year |


## Frequently asked questions

### Is SSC Spring Engineering free?

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

### Is TB Logic free?

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

### Which has better reviews, SSC Spring Engineering or TB Logic?

TB Logic is rated higher. SSC Spring Engineering averages 4.6 out of 5 from 26 ratings, while TB Logic averages 5.0 from 4 ratings.

### Do SSC Spring Engineering or TB Logic have ads?

Neither SSC Spring Engineering nor TB Logic shows ads.

### Which is updated more often, SSC Spring Engineering or TB Logic?

SSC Spring Engineering ships an update every 6 months, and TB Logic weekly. Most recently, SSC Spring Engineering was updated on September 29, 2026 and TB Logic 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.*