# Crankotix — One crank tells all.

> One crank tells all. (iPhone/iPad app by DENNIEL JEAN-FRANCOIS.)

- Source: https://appshunter.io/ios/app/crankotix/id6762244578 (this page in markdown: same URL + `.md`)
- Developer: [DENNIEL JEAN-FRANCOIS](https://appshunter.io/developer/1523880701)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.6 · 13 MB
- Languages: American English
- Released: 2026-07-01
- Data updated: 2026-10-31

## What is Crankotix?

Measure your engine's relative compression in seconds.
No extra tools, no sensors, just your iPhone.


TRY IT BEFORE YOU BUY , Get 3 free tests to see Crankotix in action

Buying a used car? Diagnosing a rough engine?
Don't guess. Don't dismantle. Don't pay for hours
of workshop time.

Crankotix is the world's first iPhone-based
relative compression tester. Using nothing but
your phone's built-in magnetometer, it reveals
the health of any 3 or 4 cylinder engine -
diesel or petrol- in less than 30 seconds.


HOW IT WORKS

1. Remove the fuel pump fuse, disconnect camshaft sensors or disconnect the ignition system... (according to the engine technology)
2. Place your iPhone near the negative battery terminal
3. Crank the engine for 5 seconds (Follow the audio instructions)
4. Get instant relative compression results

That's it. No probes. No Bluetooth dongles.
No mechanical tools. Just your iPhone.

WHY IT WORKS
When the starter motor cranks your engine, every
compression cycle creates a current spike. These
current spikes generate magnetic field
variations which your iPhone's magnetometer
captures.

Crankotix analyzes these signals and
tells if the relative compressions are well balanced.

WHO IT'S FOR
* Used car buyers who want peace of mind
  before signing the check
* DIY mechanics tired of mechanical compression
  testers and oily workshops
* Independent garages looking for a fast
  pre-diagnostic tool
* Anyone who values their engine

KEY FEATURES
- 10-second test, instant results
- Works on diesel and petrol engines
- Supports 3 and 4 cylinder engines
- No additional hardware required
- Visual gauge results 
- Optional countdown timer for hands-free testing
- Built-in tutorial and audio guidance
- Works on any iPhone with a magnetometer


TRY IT BEFORE YOU BUY
Get 3 free tests to see Crankotix in action
on your own engine. Then unlock unlimited
testing with a single one-time purchase.

No subscriptions. No ads.

IMPORTANT NOTES
- Crankotix performs RELATIVE compression
  testing, comparing cylinders to each other
- A minimum level of mechanical knowledge is
  required to prevent engine starting
- Cylinder identification is not provided. If
  an imbalance is detected, a traditional
  cylinder-by-cylinder test is recommended

JOIN A NEW GENERATION OF DIAGNOSTICS
Mechanics have used compression testers for
nearly a century. The procedure hasn't changed.
The tools haven't evolved.

Until now.

Crankotix puts professional-grade engine
diagnostics in your pocket. Whether you're
saving thousands on a bad used car deal or
streamlining your workshop, the difference is
felt from the very first test.

Download Crankotix today.
Save time and money

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlimited Tests | $9.99 | one-time |


## Is Crankotix safe?

Not enough ratings yet to assess Crankotix.

## Is Crankotix legit?

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


## Version history (last 1 release)

### 1.0 — 2026-07-01

No release notes.

## More apps by DENNIEL JEAN-FRANCOIS

- [Mecabud](https://appshunter.io/ios/app/mecabud/id1525069308)
- [Mecabudy](https://appshunter.io/ios/app/mecabudy/id1525698735)
- [MecaTest](https://appshunter.io/ios/app/mecatest/id6447468608)
- [SoundMeter 2D](https://appshunter.io/ios/app/soundmeter-2d/id6737282025)

All apps by DENNIEL JEAN-FRANCOIS: https://appshunter.io/developer/1523880701

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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 2026-10-31.*