# Tethys Visio vs Html to PDF Converter Plus

The clearest difference is in-app purchases: Tethys Visio at none against Html to PDF Converter Plus's 2. Tethys Visio also leads on ads (none vs shown). Html to PDF Converter Plus's advantage is update cadence (every 2 days vs monthly) and iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Html to PDF Converter Plus sells 2 in-app purchases, starting at $3.99 per month. Tethys Visio asks for nothing beyond the download.

Tethys Visio ships an update monthly, Html to PDF Converter Plus every 2 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Tethys Visio | Html to PDF Converter Plus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 2 days** |
| Size | 138 MB | 57 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Celec](https://appshunter.io/developer/1634197210) | [Johan Urgelles](https://appshunter.io/developer/1895608241) |

## What reviewers say

### Tethys Visio

[App page](https://appshunter.io/ios/app/tethys-visio/id6737887067)

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

**In-app purchases:** none


### Html to PDF Converter Plus

[App page](https://appshunter.io/ios/app/html-to-pdf-converter-plus/id6764351572)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $3.99 | per month |
| Annual Premium | $8.99 | per year |


## Frequently asked questions

### Is Tethys Visio free?

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

### Is Html to PDF Converter Plus free?

Html to PDF Converter Plus is free to download, with in-app purchases available.

### Do Tethys Visio or Html to PDF Converter Plus have ads?

Html to PDF Converter Plus shows ads; Tethys Visio does not.

### Which is updated more often, Tethys Visio or Html to PDF Converter Plus?

Tethys Visio ships an update monthly, and Html to PDF Converter Plus every 2 days. Most recently, Tethys Visio was updated on October 30, 2026 and Html to PDF Converter Plus 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.*