# DCircuit Lab vs Bolt Torque

The clearest difference is review sentiment: Bolt Torque at 100% against DCircuit Lab's 11%. Bolt Torque also leads on rating (5.0 vs 3.0) and update cadence (monthly vs every 10 months). DCircuit Lab's advantage is price ($3.99 vs $9.99) and ratings volume (3 vs 1). On ads, in-app purchases, monetization model and device support there is nothing between them.

DCircuit Lab costs $3.99 and Bolt Torque $9.99 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 3.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 11% of DCircuit Lab's written reviews are positive against 100% of Bolt Torque's.

DCircuit Lab ships an update every 10 months, Bolt Torque monthly. The most recent releases landed on August 23, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | DCircuit Lab | Bolt Torque |
| --- | --- | --- |
| Price | **$3.99** | $9.99 |
| Rating | [3.0 (3 ratings)](https://appshunter.io/ios/app/dcircuit-lab/id382544208/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bolt-torque/id702964576/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 11.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 3 MB | 1 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Fabrizio Boco](https://appshunter.io/developer/466239616) | [Jochen Autrata](https://appshunter.io/developer/702964579) |

## What reviewers say

### DCircuit Lab

[App page](https://appshunter.io/ios/app/dcircuit-lab/id382544208)

Design and simulate digital circuits with a comprehensive set of tools. Explore combinatorial and sequential logic, including gates, flip-flops, and custom components. Dynamic simulation with timing charts helps analyze circuit behavior.

**Highlights:** Combinatorial and sequential circuit simulation, Single-step and step-by-step simulation modes, Dynamic simulation with timing charts, Wide range of logic gates and flip-flops, Custom component creation via truth tables, Integrated video tutorials

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is DCircuit Lab free?

DCircuit Lab costs $3.99, with no in-app purchases.

### Is Bolt Torque free?

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

### Which has better reviews, DCircuit Lab or Bolt Torque?

Bolt Torque is rated higher. DCircuit Lab averages 3.0 out of 5 from 3 ratings, while Bolt Torque averages 5.0 from 1 ratings.

### Do DCircuit Lab or Bolt Torque have ads?

Neither DCircuit Lab nor Bolt Torque shows ads.

### Which is updated more often, DCircuit Lab or Bolt Torque?

DCircuit Lab ships an update every 10 months, and Bolt Torque monthly. Most recently, DCircuit Lab was updated on August 23, 2026 and Bolt Torque on September 6, 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.*