# Convert to PDF vs Wavelet Voice Sonogram

The clearest difference is ads: Wavelet Voice Sonogram at none against Convert to PDF's shown. Wavelet Voice Sonogram also leads on update cadence (every 8 months vs every 20 months). Convert to PDF's advantage is price ($1.99 vs $6.99) and device support (3 vs 1). On in-app purchases there is nothing between them.

Convert to PDF costs $1.99 and Wavelet Voice Sonogram $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Convert to PDF ships an update every 20 months, Wavelet Voice Sonogram every 8 months. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Convert to PDF | Wavelet Voice Sonogram |
| --- | --- | --- |
| Price | **$1.99** | $6.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/convert-to-pdf/id490098718/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 8 months** |
| Monetization | Ad-supported | — |
| Size | 81 MB | 0 MB |
| Requires iOS | **11.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ice Cold Apps](https://appshunter.io/developer/468552068) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### Convert to PDF

[App page](https://appshunter.io/ios/app/convert-to-pdf/id490098718)

Transform various document and image files into PDF format quickly and easily. Upload files to the cloud for fast conversion, then share your new PDFs through multiple options. Supports over 2000 source formats.

**Highlights:** Convert over 2000 source formats to PDF, Save as document or ebook, Use 'Open with' for file loading, Load images from gallery or camera, Multiple sharing options

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

**In-app purchases:** none


### Wavelet Voice Sonogram

[App page](https://appshunter.io/ios/app/wavelet-voice-sonogram/id1574131130)

**In-app purchases:** none


## Frequently asked questions

### Is Convert to PDF free?

Convert to PDF costs $1.99, with no in-app purchases.

### Is Wavelet Voice Sonogram free?

Wavelet Voice Sonogram costs $6.99, with no in-app purchases.

### Do Convert to PDF or Wavelet Voice Sonogram have ads?

Convert to PDF shows ads; Wavelet Voice Sonogram does not.

### Which is updated more often, Convert to PDF or Wavelet Voice Sonogram?

Convert to PDF ships an update every 20 months, and Wavelet Voice Sonogram every 8 months. Most recently, Convert to PDF was updated on November 1, 2026 and Wavelet Voice Sonogram on October 25, 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.*