# Merlin AI vs Ninja AI

The clearest difference is rating: Merlin AI at 4.5 against Ninja AI's 4.0. Merlin AI also leads on ratings volume (790 vs 53). Ninja AI's advantage is review sentiment (55% vs 43%). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Merlin AI sells 10 in-app purchases, starting at $9.99 per 7 days and Ninja AI sells 7 in-app purchases, starting at $5.00 per month. Whichever you choose, the download price is not the number that matters.

Merlin AI holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Merlin AI has 790 ratings behind it against 53, so its average is the more settled of the two. Written reviews complicate that: 43% of Merlin AI's written reviews are positive against 55% of Ninja AI's, so the app with the better star average is not the one people write more warmly about.

Merlin AI ships an update every 10 days, Ninja AI fortnightly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Merlin AI | Ninja AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (790 ratings)](https://appshunter.io/ios/app/merlin-ai-ai-chat-assistant/id6453692447/reviews)** | [4.0 (53 ratings)](https://appshunter.io/ios/app/ninja-ai-chat-code-and-create/id6702030312/reviews) |
| Number of ratings | **790** | 53 |
| Positive reviews | 42.8% of reviews | **54.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 102 MB | 61 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Foyer Tech, Inc](https://appshunter.io/developer/1726728196) | [Ninjatech AI, Inc](https://appshunter.io/developer/1769664088) |

## What reviewers say

### Merlin AI

[App page](https://appshunter.io/ios/app/merlin-ai-ai-chat-assistant/id6453692447)

This AI assistant helps with daily tasks, from problem-solving and research to creative writing and media summarization. It offers access to over 20 advanced AI models, including ChatGPT and Gemini, with tools for image generation, content creation, and more.

**Highlights:** AI Chatbot with multiple models (ChatGPT, Gemini, Claude), PDF summarization and management, Podcast and YouTube video summarization, AI writing and essay assistance, AI image generation (DALL-E, Stable Diffusion), Various AI tools (AI Detector, Plagiarism Checker), Creative AI generators (Baby, Tattoo, Portrait)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Merlin Pro Weekly | $9.99 | per 7 days |
| Weekly Merlin Unlimited | $10.00 | per 7 days |
| Monthly Merlin Unlimited | $15.00 | per month |
| Merlin Pro Monthly | $20.00 | per month |
| Yearly Black Friday | $89.99 | per year |
| Yearly Merlin Unlimited | $100.00 | per year |
| Yearly Merlin Unlimited | $150.00 | per year |
| TopUp - 1500 Queries, 7 Days | $3.49 | one-time |
| TopUp - 3000 Queries, 30 Days | $4.99 | one-time |
| TopUp - 10000 Queries, 30 Days | $14.00 | one-time |

**What reviewers like**

- 🚀 Fast and efficient
- 👍 User-friendly interface
- 💡 Variety of AI models
- 🔥 Powerful and versatile
- 😊 Helpful and convenient

**What reviewers complain about**

- 🐛 Buggy and unreliable
- ⏱️ Slow response times
- 💰 Expensive subscription
- 🔍 Misleading advertising
- 🤔 Inconsistent performance

**Reported bugs**

- Frequent app crashes
- Overlapping UI elements
- Incorrect model selection
- Inability to cancel subscriptions
- Censorship of user inputs

**Requested features**

- Shortcut integration for iOS
- Improved iPad compatibility
- Ability to save and reuse prompts
- Enhanced security and privacy features
- Seamless integration with other apps


### 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


## Frequently asked questions

### Is Merlin AI free?

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

### Is Ninja AI free?

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

### Which has better reviews, Merlin AI or Ninja AI?

Merlin AI is rated higher. Merlin AI averages 4.5 out of 5 from 790 ratings, while Ninja AI averages 4.0 from 53 ratings.

### Do Merlin AI or Ninja AI have ads?

Neither Merlin AI nor Ninja AI shows ads.

### Which is updated more often, Merlin AI or Ninja AI?

Merlin AI ships an update every 10 days, and Ninja AI fortnightly. Most recently, Merlin AI was updated on November 4, 2026 and Ninja AI on October 30, 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.*