# Door Assistant vs TimingMachine

The clearest difference is price: Door Assistant at Free against TimingMachine's $8.99. Door Assistant also leads on iOS requirement (15.0 vs 26.0). TimingMachine's advantage is update cadence (every 11 days vs every 6 weeks). On ads, in-app purchases and device support there is nothing between them.

Door Assistant is free to download; TimingMachine costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Door Assistant ships an update every 6 weeks, TimingMachine every 11 days. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Door Assistant | TimingMachine |
| --- | --- | --- |
| Price | **Free** | $8.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 11 days** |
| Monetization | — | Paid |
| Size | 208 MB | 32 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FEIG ELECTRONIC GmbH](https://appshunter.io/developer/1484784319) | [keywerks GmbH](https://appshunter.io/developer/1336049861) |

## What reviewers say

### Door Assistant

[App page](https://appshunter.io/ios/app/door-assistant/id1484784320)

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

**In-app purchases:** none


### TimingMachine

[App page](https://appshunter.io/ios/app/timingmachine/id1499524052)

This tool helps determine and compare engine timing for 2-stroke engines. It calculates piston positions, the effect of spacers, and offers graphical representations. Results can be exported as PDF or with custom text and images.

**Highlights:** Convert measurements to engine timings, Convert engine timings to measurements, Compare engine timings, Calculate cylinder spacer effects, Graphical representation of timings, Export results as PDF, Snapshot function for storing setups

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

**In-app purchases:** none


## Frequently asked questions

### Is Door Assistant free?

Door Assistant is free to download, with no in-app purchases.

### Is TimingMachine free?

TimingMachine costs $8.99, with no in-app purchases.

### Do Door Assistant or TimingMachine have ads?

Neither Door Assistant nor TimingMachine shows ads.

### Which is updated more often, Door Assistant or TimingMachine?

Door Assistant ships an update every 6 weeks, and TimingMachine every 11 days. Most recently, Door Assistant was updated on September 10, 2026 and TimingMachine on September 21, 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.*