# Ninja AI vs ARC Private PDF Scanner

The clearest difference is review sentiment: ARC Private PDF Scanner at 100% against Ninja AI's 55%. ARC Private PDF Scanner also leads on in-app purchases (none vs 7). Ninja AI's advantage is price (Free vs $0.99). On update cadence, ads, device support and iOS requirement there is nothing between them.

Ninja AI is free to download; ARC Private PDF Scanner costs $0.99 up front. Ninja AI sells 7 in-app purchases, starting at $5.00 per month. ARC Private PDF Scanner asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Ninja AI | ARC Private PDF Scanner |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.0 (53 ratings)](https://appshunter.io/ios/app/ninja-ai-chat-code-and-create/id6702030312/reviews)** | — |
| Number of ratings | **53** | — |
| Positive reviews | 54.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 61 MB | 2 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Ninjatech AI, Inc](https://appshunter.io/developer/1769664088) | [GOLDEN ARC DIGITAL INC.](https://appshunter.io/developer/1462423563) |

## What reviewers say

### Ninja AI

[App page](https://appshunter.io/ios/app/ninja-ai-chat-code-and-create/id6702030312)

This AI assistant offers a dual experience with a chat agent for everyday tasks and an autonomous agent for complex projects. It supports numerous premium AI models for tasks like coding, content creation, research, and website building, boasting high-speed performance.

**Highlights:** Dual AI experience (Chat & Autonomous Agent), Supports 40+ premium AI models, Autonomous project execution on its own computer, Blazing fast performance (up to 3000 tokens/sec), Website building and deployment, Content creation (text, images, video, podcasts), Code generation and debugging, File analysis and research

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $5.00 | per month |
| Pro | $10.00 | per month |
| Ultra | $15.00 | per month |
| SuperNinja Standard | $19.00 | per month |
| SuperNinja Pro | $29.00 | per month |
| SuperNinja Ultra | $49.00 | per month |
| SuperNinja Max | $149.00 | per month |

**What reviewers like**

- 🚀 Fast and efficient
- 👍 Smooth and user-friendly UI
- 💡 Powerful research and analysis capabilities
- 🚀 Sleek and responsive
- 👍 Integrated interface

**What reviewers complain about**

- 💰 Pay-to-use model for advanced features
- 🗑️ Inability to delete old chats

**Reported bugs**

- Crashes and freezes reported
- Compatibility issues with older devices

**Requested features**

- Implement delete option for chat history
- Add Chinese language support


### ARC Private PDF Scanner

[App page](https://appshunter.io/ios/app/arc-private-pdf-scanner/id6817884165)

This app transforms paper documents into editable text directly on your device. It offers multiple export formats, including searchable PDFs and structured JSON, ensuring your data remains private and secure. Enjoy powerful scanning and text recognition without ads or subscriptions.

**Highlights:** On-device text recognition, Multiple export formats (PDF, TXT, JSON), Multi-page scanning, Automatic edge detection, No ads or tracking, One-time purchase

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

**In-app purchases:** none


## Frequently asked questions

### Is Ninja AI free?

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

### Is ARC Private PDF Scanner free?

ARC Private PDF Scanner costs $0.99, with no in-app purchases.

### Do Ninja AI or ARC Private PDF Scanner have ads?

Neither Ninja AI nor ARC Private PDF Scanner shows ads.

### Which is updated more often, Ninja AI or ARC Private PDF Scanner?

Ninja AI ships an update fortnightly, and ARC Private PDF Scanner fortnightly. Most recently, Ninja AI was updated on October 24, 2026 and ARC Private PDF Scanner on October 26, 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.*