# feiffer combine vs kyajet

The clearest difference is price: feiffer combine at Free against kyajet's $7.99. feiffer combine also leads on rating (5.0 vs 4.5). kyajet's advantage is in-app purchases (none vs 10) and review sentiment (100% vs 69%). On update cadence, ads, device support and iOS requirement there is nothing between them.

feiffer combine is free to download; kyajet costs $7.99 up front. feiffer combine sells 10 one-off in-app purchases. kyajet asks for nothing beyond the download.

feiffer combine holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: kyajet has 13 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 69% of feiffer combine's written reviews are positive against 100% of kyajet's, so the app with the better star average is not the one people write more warmly about.

feiffer combine ships an update every 6 months, kyajet every 4 months. The most recent releases landed on August 1, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | feiffer combine | kyajet |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/feiffer-combine/id875043795/reviews)** | [4.5 (13 ratings)](https://appshunter.io/ios/app/kyajet/id1336049862/reviews) |
| Number of ratings | 1 | **13** |
| Positive reviews | 68.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 20 MB | 3 MB |
| Requires iOS | **13.0** | 14.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrea Feiffer](https://appshunter.io/developer/875043798) | [keywerks GmbH](https://appshunter.io/developer/1336049861) |

## What reviewers say

### feiffer combine

[App page](https://appshunter.io/ios/app/feiffer-combine/id875043795)

This app provides a step-by-step guide for calibrating combine harvesters to achieve optimal settings. It adapts to throughput and losses, ensuring proper adjustment for all harvest conditions and performance ranges, thereby limiting losses.

**Highlights:** Step-by-step calibration guide, Optimal combine harvester settings, Adapts to throughput and losses, Field-tested and reliable values, Quick and safe calibration, Demo version available

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| John Deere 2054 | $29.99 | one-time |
| Claas Trion 720 | $29.99 | one-time |
| Claas Trion 660 | $29.99 | one-time |
| Claas Trion 730 | $29.99 | one-time |
| Claas Trion 640 | $29.99 | one-time |
| Claas Trion 520 | $29.99 | one-time |
| Claas Trion 530 | $29.99 | one-time |
| Claas Trion 650 | $29.99 | one-time |
| John Deere S 785 | $29.99 | one-time |
| Claas Trion 750 | $29.99 | one-time |


### kyajet

[App page](https://appshunter.io/ios/app/kyajet/id1336049862)

This tool helps optimize Keihin carburetor settings with a clean interface and comprehensive data on jets and needles. Compare different setups to improve your vehicle's performance.

**Highlights:** Carburetor setup tool, Keihin carburetor optimization, Jet and needle data, Setup comparison, Performance improvement

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

**In-app purchases:** none


## Frequently asked questions

### Is feiffer combine free?

feiffer combine is free to download, with in-app purchases available.

### Is kyajet free?

kyajet costs $7.99, with no in-app purchases.

### Which has better reviews, feiffer combine or kyajet?

feiffer combine is rated higher. feiffer combine averages 5.0 out of 5 from 1 ratings, while kyajet averages 4.5 from 13 ratings.

### Do feiffer combine or kyajet have ads?

Neither feiffer combine nor kyajet shows ads.

### Which is updated more often, feiffer combine or kyajet?

feiffer combine ships an update every 6 months, and kyajet every 4 months. Most recently, feiffer combine was updated on August 1, 2026 and kyajet on September 22, 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.*