# PNG to PDF vs FieldStack

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.

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.

## The numbers

| Metric | PNG to PDF | FieldStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (29 ratings)](https://appshunter.io/ios/app/png-to-pdf/id6578443129/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fieldstack/id6792173715/reviews)** |
| Number of ratings | **29** | 1 |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 18 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andy Sutanto](https://appshunter.io/developer/1659282966) | [Dylan Russell](https://appshunter.io/developer/1869725372) |

## What reviewers say

### PNG to PDF

[App page](https://appshunter.io/ios/app/png-to-pdf/id6578443129)

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.

**Highlights:** Multiple PNG to PDF conversion, Customizable paper sizes, Auto and manual size selection, Conversion history tracking, Create single PDF from multiple images

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Convert PNG to PDF Pro | $4.99 | per 7 days |
| PNG to PDF Converter Pro - 1M | $9.99 | per month |
| PNG to PDF Converter Pro - 1Y | $39.99 | per year |
| PNG to PDF Converter Pro | $19.99 | one-time |
| Offering for New User | $49.99 | one-time |


### FieldStack

[App page](https://appshunter.io/ios/app/fieldstack/id6792173715)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PNG to PDF free?

PNG to PDF is free to download, with in-app purchases available.

### Is FieldStack free?

FieldStack is free to download, with no in-app purchases.

### Which has better reviews, PNG to PDF or FieldStack?

FieldStack is rated higher. PNG to PDF averages 4.8 out of 5 from 29 ratings, while FieldStack averages 5.0 from 1 ratings.

### Do PNG to PDF or FieldStack have ads?

PNG to PDF shows ads; FieldStack does not.

### Which is updated more often, PNG to PDF or FieldStack?

PNG to PDF ships an update every 2 months, and FieldStack every 8 days. Most recently, PNG to PDF was updated on October 5, 2026 and FieldStack on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*