# Caption Writer AI vs eSign PDF Sign Documents

The clearest difference is ads: Caption Writer AI at none against eSign PDF Sign Documents's shown. Caption Writer AI also leads on iOS requirement (13.0 vs 15.0). eSign PDF Sign Documents's advantage is update cadence (fortnightly vs every 3 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Caption Writer AI sells 2 in-app purchases, starting at $7.99 per month and eSign PDF Sign Documents sells 14 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Caption Writer AI ships an update every 3 months, eSign PDF Sign Documents fortnightly. The most recent releases landed on September 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Caption Writer AI | eSign PDF Sign Documents |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (48 ratings)](https://appshunter.io/ios/app/esign-pdf-sign-documents/id6472438583/reviews)** |
| Number of ratings | — | **48** |
| Positive reviews | — | 60.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 38 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [丽英 郭](https://appshunter.io/developer/1547214331) | [HEN AI Co., Ltd](https://appshunter.io/developer/1716694033) |

## What reviewers say

### Caption Writer AI

[App page](https://appshunter.io/ios/app/caption-writer-ai/id6472153889)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caption Writer Pro | $7.99 | per month |
| Caption Writer Pro | $59.99 | per year |


### eSign PDF Sign Documents

[App page](https://appshunter.io/ios/app/esign-pdf-sign-documents/id6472438583)

Easily sign PDFs and other documents electronically with your handwritten signature. This app allows you to scan, edit, and sign documents from your phone, making paperwork quick and convenient. Share and print signed documents directly from the application.

**Highlights:** Add digital signatures to documents, Scan paper documents, Create documents from photos, Sign PDF, DOC, XLS, and more, Share and print signed documents

**Features:** macOS Compatibility

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro(Weekly) | $4.99 | per 7 days |
| Premium | $6.99 | per 7 days |
| Signature Maker Premium | $9.99 | per month |
| Signature Maker Premium | $12.99 | per month |
| Signature Maker Premium | $19.99 | per year |
| Pro(monthly)(3 Trial) | $19.99 | per month |
| Premium | $19.99 | per month |
| Premium | $29.99 | per year |
| Premium | $35.99 | per year |
| Signature Maker Premium(1Year) | $39.99 | per year |
| Premium | $49.99 | per year |
| Signature Maker Premium(1Year) | $49.99 | per year |
| Signature Maker Premium | $19.99 | one-time |
| Lifetime Pro | $59.99 | one-time |


## Frequently asked questions

### Is Caption Writer AI free?

Caption Writer AI is free to download, with in-app purchases available.

### Is eSign PDF Sign Documents free?

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

### Do Caption Writer AI or eSign PDF Sign Documents have ads?

eSign PDF Sign Documents shows ads; Caption Writer AI does not.

### Which is updated more often, Caption Writer AI or eSign PDF Sign Documents?

Caption Writer AI ships an update every 3 months, and eSign PDF Sign Documents fortnightly. Most recently, Caption Writer AI was updated on September 18, 2026 and eSign PDF Sign Documents 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.*