Dr. Hahn Instructions vs Retinal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dr. Hahn Instructions
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Dr. Hahn has launched this app to provide its customers with all adjustment instructions as videos in a user-friendly manner. The right instructions can be found quickly thanks to the app's intuitiveness and ease of use. All instructional videos for an accurate adjustment of Dr. Hahn hinges for metal and PVC doors are included, in particular different versions of 2-piece and 3-piece hinges, as well as fastening options with or without KT-Fix. The videos explain in detail every work step required for making height, horizontal and sealing pressure adjustments. Once a video is downloaded, it can be used offline at any time.
Retinal
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Not all displays for Mac are well suited to display the user interface in a non-scaled resolution. A pixel density of about 110 pixels per inch (PPI) for non-Retina, and about 220 PPI for Retina is comfortable for most people. Use Retinal to work out the pixel density of any display.
Screenshots
Verdict
The clearest difference is update cadence: Retinal at fortnightly against Dr. Hahn Instructions's every 15 months. Dr. Hahn Instructions's advantage is iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Dr. Hahn Instructions ships an update every 15 months, Retinal fortnightly. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.
| Parameter | Dr. Hahn Instructions | Retinal |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 15 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 18 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Team Stiefelhagen Werbeagentur GmbH | Nico Rohrbach |
In-app purchases
Dr. Hahn Instructions
No in-app purchases
Retinal
No in-app purchases
Questions
Is Dr. Hahn Instructions free?
Is Retinal free?
Do Dr. Hahn Instructions or Retinal have ads?
Which is updated more often, Dr. Hahn Instructions or Retinal?
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