# KIGAKU - How Machines Work — See how mechanisms move

> See how mechanisms move (iPhone/iPad app by Fuji Bit Inc..)

- Source: https://appshunter.io/ios/app/kigaku-how-machines-work/id6766719349 (this page in markdown: same URL + `.md`)
- Developer: [Fuji Bit Inc.](https://appshunter.io/developer/1874205957)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 26 MB
- Languages: American English, Afrikaans, Albanian, Amharic, Arabic, Armenian, Azerbaijani, Basque, Belarusian, Bangla and 63 more
- Released: 2026-05-06
- Data updated: 2026-11-05

## What is KIGAKU?

KIGAKU is a visual learning app that teaches how machines work by letting you move them.

How do teeth change speed and torque? Why can a pulley or screw turn a small force into a large one? Move a slider and the mechanism responds at once, with its results updating alongside. The formulas in your textbook connect to motion you can see.

[Transmit power]
- Gears: how tooth counts set speed and torque
- Belt drive: pulley diameter and speed ratio
- Planetary gear (new): hold a different part for reduction, overdrive, or reverse

[Multiply force]
- Pulleys: rope count, required force, and pull distance
- Lever: fulcrum position and balance of moments
- Screw: turning torque into thrust, and efficiency
- Hydraulics: Pascal's principle and piston area ratio

[Convert motion]
- Linkage: four-bar paths and Grashof's condition
- Cam: shapes that turn rotation into lift
- Crank: converting rotation and reciprocation
- Geneva drive (new): turning steady spin into stop-and-go steps
- Robot arm: joint angles and tip position

[Features]
- A sheet explaining the formulas and principles of each mechanism
- Learn without an internet connection
- Dark and light modes
- Available in 74 languages
- Free, with banner ads only at the bottom of the screen

Great for students of mechanical engineering and robotics, anyone curious about how machines work, and teachers looking for classroom material.

Developer: Fuji Bit Inc.

## Is KIGAKU safe?

Not enough ratings yet to assess KIGAKU.

## Is KIGAKU legit?

KIGAKU - How Machines Work appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for KIGAKU is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 3.0.0 — 2026-11-02

3.0.0
- All-new design
- New modes: planetary gear and Geneva drive
- Now available in 74 languages
- New ad system, with ad settings added

### 2.1 — 2026-06-03

- Linkage now scales with the screen, so the mechanism appears full-size on iPad and other large displays

### 2.0 — 2026-05-15

- Every simulation now shows its headline result right on the canvas
- Lever now correctly switches between 1st / 2nd / 3rd class
- Linkage shows the current mechanism type (crank-rocker / double-crank / double-rocker / change-point / non-Grashof) from Grashof's condition
- Crank shows r/l value and a piston-displacement plot with current-angle marker
- Cam shows current lift / max lift / angle, with axis label on the trace
- Gear labels each gear with its tooth count and a rotation-direction arrow
- Hydraulic shows the (D₂/D₁)² area-ratio derivation above the pipe
- Belt drive shows belt-direction arrows and per-pulley RPM
- Robot arm: drag the tip to drive inverse kinematics
- Pulley wording unified around the supporting rope count N
- Pulley and Lever metric label changed to "Required Force"
- Linkage canvas re-centered

### 1.0 — 2026-05-06

No release notes.

## Apps similar to KIGAKU

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [MechSpace](https://appshunter.io/ios/app/mechspace/id6761298464) | — | Free | Education |
| [Machine Elements 3D](https://appshunter.io/ios/app/machine-elements-3d/id6804215914) | — | Free | Education |
| [KiGears Lab: Build with Gears](https://appshunter.io/ios/app/kigears-lab-build-with-gears/id6758487782) | 5.0 (3) | Free | Education |
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| [Foldly: Origami for Kids](https://appshunter.io/ios/app/foldly-origami-for-kids/id6814659381) | — | Free | Education |
| [Mechanical Engineering Lab](https://appshunter.io/ios/app/mechanical-engineering-lab/id6766063704) | — | $12.99 | Education |

## More apps by Fuji Bit Inc.

- [RENGOKU: Time Attack Pachinko](https://appshunter.io/ios/app/rengoku-time-attack-pachinko/id6758652751)
- [SUUGAKU - Enjoy Numbers](https://appshunter.io/ios/app/suugaku-enjoy-numbers/id6759102221)
- [BUTURAKU](https://appshunter.io/ios/app/buturaku/id6759213255)
- [DENRAKU - Electromagnetism Sim](https://appshunter.io/ios/app/denraku-electromagnetism-sim/id6759393816)
- [PAKEDOU](https://appshunter.io/ios/app/pakedou/id6759820254)
- [OKURERUNA！](https://appshunter.io/ios/app/okureruna/id6759956971)

All apps by Fuji Bit Inc.: https://appshunter.io/developer/1874205957

## Related topics

[kinemaster 5](https://appshunter.io/ios/topics/kinemaster-5)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-05.*