ImageConverter vs PolyPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ImageConverter
Easily resize and change the file format of your images. Supports batch conversions for up to 15 images at once, with options to specify size by percentage or pixels while retaining aspect ratio. Save in HEIC, PNG, or JPG formats.
- Resize images by percentage or pixels
- Convert between HEIC, PNG, and JPG
- Batch conversion up to 15 images
- Maintain aspect ratio
- Simple 4-step conversion process
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You can convert the image size and storage format with a simple operation! Of course, multiple simultaneous conversions are also supported! ・ The size can be specified by% and pixel, and the retention / non-retention of aspect ratio can be changed. ・ Supported saving formats are HEIC, PNG, and JPG. ・ Up to 15 images can be converted simultaneously. ■ Usage You can convert images in 4 simple steps ● Step 1 Tap the part where "NO IMAGE" is displayed and select the image you want to convert ● Step 2 Adjust the Width and Height values and select "%" or "pixel" to determine the size ● Step 3 Choose HEIC, PNG or JPG and decide the save format ● Step 4 Tap the save button at the bottom right of the screen to save
PolyPDF
This app provides a PDF studio for drawing-set review and markup on iPad and iPhone. It allows users to open plans, navigate pages, measure to scale, add various annotations, and save their work. Advanced features are available via an optional Pro purchase.
- Drawing-set review
- PDF markup tools
- Measure to scale
- Add callouts, shapes, stamps
- Markup Table for findings
- Export and share PDFs
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PolyPDF brings drawing-set review and PDF markup to iPad and iPhone. Open plans from Files, move between pages, measure to scale, add markups, and save your work back to a PDF. Built for AEC work • Review multi-page plan sets with thumbnails and tabs. • Measure lengths and areas using a calibrated scale. • Add callouts, clouds, shapes, stamps, and freehand markup. • Count symbols and organize findings in the Markup Table. • Export or share the finished PDF. Your documents remain in the locations you choose in Files. PolyPDF supports an optional Pro purchase for advanced tools; the app shows which features require Pro before purchase. PolyPDF is also available on Mac. Visit polypdf.com for details and support.
Screenshots
Verdict
The clearest difference is rating: PolyPDF at 5.0 against ImageConverter's 4.0. ImageConverter's advantage is monetization model (free vs freemium) and iOS requirement (11.0 vs 17.0). On price, ratings volume, update cadence and ads 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.
PolyPDF holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 3, 2026 and October 8, 2026 respectively.
| Parameter | ImageConverter | PolyPDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) | 5.0 (2 ratings) — better |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 12 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Kenta Tanaka | Euclidean Software LLC |
Customer experience
ImageConverter
PolyPDF
In-app purchases
ImageConverter
No in-app purchases
PolyPDF
No in-app purchases
