# Dou AI vs Open Sign Send

The clearest difference is rating: Open Sign Send at 5.0 against Dou AI's 4.0. Open Sign Send also leads on in-app purchases (none vs 4) and update cadence (every 3 days vs monthly). Dou AI's advantage is ratings volume (4 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Dou AI sells 4 in-app purchases, starting at $4.99 per 7 days. Open Sign Send asks for nothing beyond the download.

Open Sign Send holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Dou AI ships an update monthly, Open Sign Send every 3 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Dou AI | Open Sign Send |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/dou-ai-chatbot/id6749772166/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/open-sign-send/id6810250868/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Subscription | **Free** |
| Size | 63 MB | 4 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Eliberty Dev LLC](https://appshunter.io/developer/1832010002) | [Saif Albusaidi](https://appshunter.io/developer/6810250870) |

## What reviewers say

### Dou AI

[App page](https://appshunter.io/ios/app/dou-ai-chatbot/id6749772166)

This AI-powered assistant helps users communicate, explore ideas, and complete daily tasks efficiently. It offers natural conversations for writing, summarizing, idea generation, and learning, making advanced AI accessible through an intuitive interface.

**Highlights:** Intelligent AI-powered communication, Idea exploration and brainstorming, Content generation and text improvement, Information retrieval and learning, Natural and context-aware conversations, Intuitive and easy-to-use interface

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Weekly | $4.99 | per 7 days |
| Monthly | $12.99 | per month |
| Yearly | $39.99 | per year |


### Open Sign Send

[App page](https://appshunter.io/ios/app/open-sign-send/id6810250868)

Easily sign PDF documents directly on your device. Add handwritten signatures or company stamps to multiple pages, adjust their placement, and then save or share the final document. Your documents are processed locally for privacy.

**Highlights:** Sign PDF documents, Add signatures to multiple pages, Import company stamps, Move, resize, and rotate signatures, Save signatures for reuse, Export and share signed PDFs, Local document processing

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

**In-app purchases:** none


## Frequently asked questions

### Is Dou AI free?

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

### Is Open Sign Send free?

Open Sign Send is free to download, with no in-app purchases.

### Which has better reviews, Dou AI or Open Sign Send?

Open Sign Send is rated higher. Dou AI averages 4.0 out of 5 from 4 ratings, while Open Sign Send averages 5.0 from 1 ratings.

### Do Dou AI or Open Sign Send have ads?

Neither Dou AI nor Open Sign Send shows ads.

### Which is updated more often, Dou AI or Open Sign Send?

Dou AI ships an update monthly, and Open Sign Send every 3 days. Most recently, Dou AI was updated on November 5, 2026 and Open Sign Send on October 31, 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.*