PixelConverter vs Retinal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PixelConverter
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It is a tool to mutually convert the print size of an image and the number of pixels. It helps to determine whether a date can be used as a publication or commercial print. When you want to know the number of pixels required for the planed range of the printing, the print size from the number of pixels of an image and the print size from an image size displayed on a screen, this tool will be useful. It can also convert a paper size to the number of pixels. How to use: first, you need to register print types such as color printing and gray printing and the corresponding printing resolution. Then this tool works according to the print type. It can also take the zoom ratio into account when you arrange an image to DTP software, etc. In addition, it will be useful at the production scene of Responsive Web site. For example, you can know with this tool how many millimeters of arbitrary pixels are displayed on a screen. Conversion function Convert mutually pixel values to mm, cm, point, inch and pica Convert an image size on a screen to the print size Convert a paper size to the pixel values Display of conversion result The pixel value (the minimum value) are displayed as an integer rounded up to the nearest decimal point The converted values (the maximum value) are rounded down to the second decimal place or the third place depending on the unit, e.g. mm Customize Registerable print DPI: 3 types. You can also set the name freely. Registerable display PPI: 2 types. The name is able to be set freely, and to measure PPI in mm or in other units is also possible (a rough estimate). There is an option that you can also set a display as a conversion target device. Unit: for the print size and the measurement of display width, it is selectable from 5 types each. Condition: it is possible to set the zoom ratio when arranging an image to DTP software, etc.
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 ads: Retinal at none against PixelConverter's shown. Retinal also leads on update cadence (fortnightly vs every 3 months). PixelConverter's advantage is iOS requirement (12.0 vs 17.0). On price, 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.
PixelConverter ships an update every 3 months, Retinal fortnightly. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.
| Parameter | PixelConverter | Retinal |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 12 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Fumio Oguni | Nico Rohrbach |
In-app purchases
PixelConverter
No in-app purchases
Retinal
No in-app purchases








