# Thermos Pro vs eSign PDF

The clearest difference is in-app purchases: Thermos Pro at none against eSign PDF's 3. Thermos Pro also leads on ads (none vs shown) and iOS requirement (15.6 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. eSign PDF sells 3 in-app purchases, starting at $1.99 per 7 days. Thermos Pro asks for nothing beyond the download.

Thermos Pro ships an update every 3 weeks, eSign PDF every 4 weeks. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Thermos Pro | eSign PDF |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 4 weeks |
| Size | 41 MB | 19 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Prabal Verma](https://appshunter.io/developer/1751691320) | [Jyoti Vaidya](https://appshunter.io/developer/1587362130) |

## What reviewers say

### Thermos Pro

[App page](https://appshunter.io/ios/app/thermos-pro-bluetooth-print/id6738410444)

**Features:** macOS Compatibility

**In-app purchases:** none


### eSign PDF

[App page](https://appshunter.io/ios/app/esign-pdf-sign-documents/id6768590632)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $1.99 | per 7 days |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $19.99 | per year |


## Frequently asked questions

### Is Thermos Pro free?

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

### Is eSign PDF free?

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

### Do Thermos Pro or eSign PDF have ads?

eSign PDF shows ads; Thermos Pro does not.

### Which is updated more often, Thermos Pro or eSign PDF?

Thermos Pro ships an update every 3 weeks, and eSign PDF every 4 weeks. Most recently, Thermos Pro was updated on October 30, 2026 and eSign PDF on October 24, 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.*