Image Size vs DPI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Image Size
Easily resize your photos to any dimension using pixels, millimeters, centimeters, or inches. Preserve aspect ratio with a simple tap and crop images with intuitive multitouch gestures. Save, email, print, or share your resized creations.
- Resize images to custom dimensions
- Support for pixels, millimeters, centimeters, and inches
- Preserve aspect ratio
- Multitouch cropping
- Save, email, print, and share options
- Remove objects from images (in-app purchase)
- Ad-free experience (in-app purchase)
Read full descriptionHide full description
This app allows you to resize an image to whatever size you like (with limitation), quickly and easily. You can specify the output format using one of the following four units of measurement: pixels, millimeters, centimeters, inches To preserve aspect ratio just tap on the chain icon between width and height input fields. This app gives you the option of saving, emailing, printing or sharing the final image. Resize your image in just four easy steps: - Open an image or take a photo - Enter your desired output size - Crop the image with your fingers using multitouch gestures - Save / print / send / share image The eraser for removing objects from the image must be unlocked with a one-time in-app purchase. The ads can be completely removed with another one-time in-app purchase.
DPI
Easily modify the DPI (dots per inch) of your images. Save, share, email, or print your adjusted photos with new DPI values.
- Change image DPI
- Save modified image
- Share image
- Email image
- Print image
Read full descriptionHide full description
This app allows you to change the DPI value of an image. The image with the changed DPI value can be saved as a new image, shared, emailed or printed.
Screenshots
Verdict
The clearest difference is update cadence: Image Size at fortnightly against DPI's every 2 months. Image Size also leads on ratings volume (30K vs 1.1K) and review sentiment (71% vs 60%). On price, rating, ads and in-app purchases 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. Image Size sells 3 one-off in-app purchases and DPI sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.7 for Image Size against 4.7 for DPI. That said, the two scores are not equally well evidenced: Image Size has 30K ratings behind it against 1.1K, so its average is the more settled of the two. Written reviews are what separate them: 71% of Image Size's written reviews are positive against 60% of DPI's.
Image Size ships an update fortnightly, DPI every 2 months. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.
| Parameter | Image Size | DPI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (30K ratings) | 4.7 (1.1K ratings) |
| Positive reviews | 71.1% of reviews — better | 60.3% of reviews |
| Number of ratings | 30K — better | 1.1K |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 18.0 |
| Further details — not scored | ||
| Size | 161 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | Vitalij Schaefer | Vitalij Schaefer |
Customer experience
Image Size
DPI
User reviews
Image Size
From 30K App Store ratingsWhat we love
- 🚀 Straightforward and easy to use
- 👍 Intuitive user interface
- 🚀 Quick resizing and editing
- 💡 Useful features like watermarking and cropping
- 👍 Saves resized images to separate album
Room to improve
- 🐛 Occasional issues with image quality after resizing
- 🔍 Unclear interface for some advanced features
- 💰 Paid version required to remove ads
- 🔍 Difficulty finding help/support options
- 🔍 Inconsistent behavior when resizing/printing images
DPI
From 1.1K App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Cleans up projects nicely
- 💡 Fantastic for increasing image resolution for printing
- 👍 Great app
- 👍 Awesome one trick pony
Room to improve
- 🐛 The app DOES NOT WORK as advertised
- 🐛 Darkened the original photo
- 🐛 Doesn't return PNG
- 💰 Too expensive at 18€
- 🌐 Doesn't work
Bugs and requests
Image Size
Reported bugs
3 issues- Resized images not saving correctly
- Ads persisting even after purchasing ad-free version
- Freezing/crashing issues on certain devices
Requested features
5 requests- Batch processing for multiple images
- More file format options (e.g. PNG support)
- Ability to adjust DPI/resolution
- Option to customize print layout and positioning
- Improved help documentation and tutorials
DPI
Reported bugs
2 issues- Crashes when trying to look back in photos
- Doesn't handle large files, just crashes
Requested features
2 requests- Upload multiple images at a time
- Merge DPI and Image Size into a single app
In-app purchases
Image Size
- Leave a tip$5.99
- Unlock eraser$9.99
- Remove Ads$39.99
DPI
- Remove Ads$34.99
