Bolt Torque vs Planetary Gear Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Planetary Gear Calculator
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.
- Calculate gear teeth
- Calculate gear speed
- Simulate planetary gear systems
- Design custom gear systems
- Preview system functionality
- Understand gear formulas
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Planetary Gears Calculator calculate the gear teeth and gear speed of planetary gears system. Plus quickly simulate how the Planetary Gears works on the fly. This is a great tool, especially for DIYer who want to design their own Planetary Gears System quick and easy. Preview how these systems work before 3D print own planetary gear system. Formula for Planetary gear systems: Sun Teeth = ringTeeth - 2 * planetTeeth Planet Teeth = (ringTeeth - sunTeeth) / 2 Ring Teeth = sunTeeth + 2 * planetTeeth ST = sunTeeth PT = planetTeeth RT = ringTeeth SunSpeed = (ST+RT)/ST * PlanetCarrierSpeed - RT/ST * RingSpeed PlanetCarrierSpeed = RT/(ST+RT) * RingSpeed + ST/(ST+RT) * SunSpeed RingSpeed = (ST+RT)/RT * PlanetCarrierSpeed - ST/RT * SunSpeed Planetary gear systems, also known as epicyclic gear systems, are important components in modern engineering. Planetary gear systems are useful for speed variation and commonly found from automatic car transmissions and industrial food mixers to operating tables and solar arrays. There are four core components that make up the planetary gear systems, the ring gear, the sun gear and the planetary gears connected to the carrier. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Bolt Torque | Planetary Gear Calculator |
|---|---|---|
| Price | $9.99 | $3.99 — better |
| Rating | 5.0 (1 ratings) — better | 4.7 (6 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 1 | 6 — better |
| Update frequency | Monthly — better | Every 46 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 13 — better |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Jochen Autrata | Heng Jia Liang |
Customer experience
Bolt Torque
Planetary Gear Calculator
In-app purchases
Bolt Torque
No in-app purchases
Planetary Gear Calculator
No in-app purchases
Questions
Is Bolt Torque free?
Is Planetary Gear Calculator free?
Which has better reviews, Bolt Torque or Planetary Gear Calculator?
Do Bolt Torque or Planetary Gear Calculator have ads?
Which is updated more often, Bolt Torque or Planetary Gear Calculator?
Other comparisons
