# Bolt Torque vs Planetary Gear Calculator

The clearest difference is review sentiment: Bolt Torque at 100% against Planetary Gear Calculator's 50%. Bolt Torque also leads on update cadence (monthly vs every 46 months) and rating (5.0 vs 4.7). Planetary Gear Calculator's advantage is price ($3.99 vs $9.99) and ratings volume (6 vs 1). On ads, in-app purchases, monetization model and device support there is nothing between them.

Bolt Torque costs $9.99 and Planetary Gear Calculator $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Bolt Torque holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Planetary Gear Calculator has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Bolt Torque's written reviews are positive against 50% of Planetary Gear Calculator's.

Bolt Torque ships an update monthly, Planetary Gear Calculator every 46 months. The most recent releases landed on September 6, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Bolt Torque | Planetary Gear Calculator |
| --- | --- | --- |
| Price | $9.99 | **$3.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bolt-torque/id702964576/reviews)** | [4.7 (6 ratings)](https://appshunter.io/ios/app/planetary-gear-calculator/id1618146516/reviews) |
| Number of ratings | 1 | **6** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 46 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | 18.6 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jochen Autrata](https://appshunter.io/developer/702964579) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Bolt Torque

[App page](https://appshunter.io/ios/app/bolt-torque/id702964576)

Calculate maximum tightening torque and preloads for various screws. Analyze preloads and stresses to ensure limits are met. All screw data is conveniently presented on a results page.

**Highlights:** Calculate tightening torque, Calculate preloads, Analyze stresses, Check limits, View screw data

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

**In-app purchases:** none


### Planetary Gear Calculator

[App page](https://appshunter.io/ios/app/planetary-gear-calculator/id1618146516)

Calculate gear teeth and speed for planetary gear systems. Quickly simulate how these systems work on the fly, ideal for DIYers designing their own systems before 3D printing. Understand the formulas and components of epicyclic gear systems.

**Highlights:** Calculate gear teeth, Calculate gear speed, Simulate planetary gear systems, Design custom gear systems, Preview system functionality, Understand gear formulas

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

**In-app purchases:** none


## Frequently asked questions

### Is Bolt Torque free?

Bolt Torque costs $9.99, with no in-app purchases.

### Is Planetary Gear Calculator free?

Planetary Gear Calculator costs $3.99, with no in-app purchases.

### Which has better reviews, Bolt Torque or Planetary Gear Calculator?

Bolt Torque is rated higher. Bolt Torque averages 5.0 out of 5 from 1 ratings, while Planetary Gear Calculator averages 4.7 from 6 ratings.

### Do Bolt Torque or Planetary Gear Calculator have ads?

Neither Bolt Torque nor Planetary Gear Calculator shows ads.

### Which is updated more often, Bolt Torque or Planetary Gear Calculator?

Bolt Torque ships an update monthly, and Planetary Gear Calculator every 46 months. Most recently, Bolt Torque was updated on September 6, 2026 and Planetary Gear Calculator on September 17, 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.*