# Sphinx Data vs eSign App

The clearest difference is in-app purchases: Sphinx Data at none against eSign App's 3. Sphinx Data also leads on update cadence (fortnightly vs every 11 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. eSign App sells 3 in-app purchases, starting at $7.99 per month. Sphinx Data asks for nothing beyond the download.

Sphinx Data ships an update fortnightly, eSign App every 11 months. The most recent releases landed on October 8, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Sphinx Data | eSign App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 11 months |
| Size | 32 MB | 12 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Sphinx ApS](https://appshunter.io/developer/1744819985) | [PixelPort LLC](https://appshunter.io/developer/1355467938) |

## What reviewers say

### Sphinx Data

[App page](https://appshunter.io/ios/app/sphinx-data/id6502264140)

**Features:** macOS Compatibility

**In-app purchases:** none


### eSign App

[App page](https://appshunter.io/ios/app/esign-app-signature-creator/id6748705042)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Pro - Monthly | $7.99 | per month |
| PDF Pro - Annual | $39.99 | per year |
| PDF Pro - Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is Sphinx Data free?

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

### Is eSign App free?

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

### Do Sphinx Data or eSign App have ads?

Neither Sphinx Data nor eSign App shows ads.

### Which is updated more often, Sphinx Data or eSign App?

Sphinx Data ships an update fortnightly, and eSign App every 11 months. Most recently, Sphinx Data was updated on October 8, 2026 and eSign App on October 14, 2026.

---

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