# SRF Diagnosis vs D

The clearest difference is update cadence: D at monthly against SRF Diagnosis's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SRF Diagnosis ships an update every 3 months, D monthly. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | SRF Diagnosis | D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/d-shift/id6466145102/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | — | Free |
| Size | 1 MB | 4 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BERNSTEIN AG](https://appshunter.io/developer/731893093) | [Dauntless Devices LLC](https://appshunter.io/developer/1706964112) |

## What reviewers say

### SRF Diagnosis

[App page](https://appshunter.io/ios/app/srf-diagnosis/id1583956869)

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-shift/id6466145102)

Configure your performance vehicle's sequential shift light wirelessly. This app allows for device setup, firmware updates, and seamless pairing. A compatible shift light device is necessary for operation.

**Highlights:** Wireless pairing, Device configuration, Firmware updates, Official app for D-Shift, Performance vehicle integration

**In-app purchases:** none


## Frequently asked questions

### Is SRF Diagnosis free?

SRF Diagnosis is free to download, with no in-app purchases.

### Is D free?

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

### Do SRF Diagnosis or D have ads?

Neither SRF Diagnosis nor D shows ads.

### Which is updated more often, SRF Diagnosis or D?

SRF Diagnosis ships an update every 3 months, and D monthly. Most recently, SRF Diagnosis was updated on October 9, 2026 and D on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*