DCircuit Lab vs Bolt Torque
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DCircuit Lab
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.
- 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
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DCircuit Lab is a tool to simulate combinatorial and sequential digital circuits. Circuits can be simulated in two ways: 1) one single step: all the outputs values are evaluated at the same time 2) step by step: outputs and gates are evaluated one step a time If circuit contains clock inputs, its simulation is dynamic. This means that outputs change accordingly to the clocks. During this dynamic simulation, user can change inputs values to study the circuit behavior which is also provided via a timing chart. Circuits are built using basic components, gates and flip-flops: * inputs (three state: 1, 0, X - undefined) * outputs * wires * NOT, AND, NAND, OR, NOR, XOR gates with any number of inputs * Flip-flop RS, JK, T, D (Positive or Negative Edge Triggered and with Set and Reset Inputs) * Multiplexers with any number of inputs * Demultiplexers with any number of outputs * Fully configurable Clocks * Custom Components defined by their truth table * BCD to 7 Segments Display Decoder * 7 Segments Display Some video tutorials are available directly from the application to learn how to use it.
Bolt Torque
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.
- Calculate tightening torque
- Calculate preloads
- Analyze stresses
- Check limits
- View screw data
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Take benefit from my engineering know how and calculate the max. tightening torque and preloads for many iso-metric and imperial screws. Calculate the preloads and stresses and check the limits. All screw data are listed on a result page. This app is a "must have" for all engineers in design departments.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | DCircuit Lab | Bolt Torque |
|---|---|---|
| Price | $3.99 — better | $9.99 |
| Rating | 3.0 (3 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 11.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 10 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | Fabrizio Boco | Jochen Autrata |
Customer experience
DCircuit Lab
Bolt Torque
In-app purchases
DCircuit Lab
No in-app purchases
Bolt Torque
No in-app purchases
Questions
Is DCircuit Lab free?
Is Bolt Torque free?
Which has better reviews, DCircuit Lab or Bolt Torque?
Do DCircuit Lab or Bolt Torque have ads?
Which is updated more often, DCircuit Lab or Bolt Torque?
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