PNG to PDF vs FieldStack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PNG to PDF
Easily transform PNG images into high-quality PDF documents. Convert multiple images into a single file with custom or standard paper sizes. Track your past conversions with a built-in history feature.
- Multiple PNG to PDF conversion
- Customizable paper sizes
- Auto and manual size selection
- Conversion history tracking
- Create single PDF from multiple images
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Transform your PNG images into high-quality PDF files with the PNG to PDF Converter app. This user-friendly app allows you to convert multiple images into a single PDF file effortlessly. Whether you need to create professional documents or save personal memories, our app provides a quick and efficient solution. Key Features: Multiple Image Conversion: Convert multiple PNG images into a single PDF file. Custom Paper Sizes: Choose from standard paper sizes such as A4, A3, A5, Letter, Legal, or set your own custom size. Auto or Manual Selection: Easily switch between automatic size selection or manually choose the dimensions that suit your needs. History: Keep track of your conversions with the built-in history feature, allowing you to quickly access previously converted files. PNG to PDF Converter app is free. You can use it forever, at no cost. However, PNG to PDF Converter app does offer premium features for its subscribers. If you decide to purchase an upgrade, you will unlock additional features. Terms of Use: https://kociapp.github.io/PNG-to-PDF/term-of-use Privacy Policy: https://kociapp.github.io/PNG-to-PDF/privacy-policy
FieldStack
This app provides an offline workspace for construction plans, allowing users to import PDFs, search every page for specific information, and create custom boards of relevant sheets. It enables on-page markup, field status recording, and note-taking, all accessible without an internet connection.
- Offline PDF plan import
- Full-page search
- Customizable sheet boards
- On-page markup tools
- Field status tracking
- Notebooks for notes and photos
- Siri and widget integration
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FieldStack is an offline field workspace for construction plan PDFs. Import the drawings without changing the original files, search every page for a room or sheet in seconds, and build a board of just the sheets a task needs. It is built for job sites with bad or no internet. SEARCH EVERY PAGE Type a room number, sheet title, or any word. FieldStack searches every page of every plan and opens the page right at the match. BUILD THE BOARD Pull the sheets a task needs into one board and arrange them your way. Press and hold a sheet to move it, set the columns, or remove sheets. The full PDF stays readable. MARK UP IN LAYERS Draw on any page in named layers like As-built, Coordination, or Punch list. Show one, some, or all, and draw on one while the rest stay in view. Markup shows on every board with that page. TRACK STATUS ON THE PLAN Place marks on a board and set them Open, In Progress, Blocked, or Done, with Urgent on top. Filter to what still needs you and keep every mark and note in one list. NOTEBOOKS Place plan pages, photos, shapes, and symbols side by side, and connect them. SIRI, SEARCH, AND WIDGETS Ask Siri to search FieldStack, find sheets from Home Screen search, and open a board, a plan set, or search from a widget. BRING THE PLANS Import source PDFs without changing the originals in Files. FieldStack does not require an account, a team workspace, or a subscription. Optional tips support continued development and unlock nothing. The reviewed interface supports English, French, Spanish, and Brazilian Portuguese. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://unshackledpursuit.com/fieldstack#privacy
Screenshots
Verdict
The clearest difference is in-app purchases: FieldStack at none against PNG to PDF's 5. FieldStack also leads on ads (none vs shown) and update cadence (every 8 days vs every 2 months). PNG to PDF's advantage is ratings volume (29 vs 1) and iOS requirement (15.0 vs 26.0). On price 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. PNG to PDF sells 5 in-app purchases, starting at $4.99 per 7 days. FieldStack asks for nothing beyond the download.
FieldStack holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: PNG to PDF has 29 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of PNG to PDF's written reviews are positive against 100% of FieldStack's.
PNG to PDF ships an update every 2 months, FieldStack every 8 days. The most recent releases landed on October 5, 2026 and October 20, 2026 respectively.
| Parameter | PNG to PDF | FieldStack |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (29 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 29 — better | 1 |
| Update frequency | Every 2 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 9 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Andy Sutanto | Dylan Russell |
Customer experience
PNG to PDF
FieldStack
In-app purchases
PNG to PDF
- Convert PNG to PDF Pro$4.997 Days
- PNG to PDF Converter Pro - 1M$9.991 Month
- PNG to PDF Converter Pro - 1Y$39.991 Year
- PNG to PDF Converter Pro$19.99
- Offering for New User$49.99
FieldStack
No in-app purchases









