Comparison

Merlin AI vs Ninja AI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Merlin AI

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
Read full description

Merlin brings the most capable AI models together in one app. Ask questions, research any topic, work through your files, and create images and videos, all from a single chat. Many models, one app Choose from a wide range of leading AI models for writing, coding, reasoning, and quick answers, or turn on Magic and let Merlin pick the right model for each message. Research with sources Merlin can search the web as it answers and shows the sources it used, so you can check where every answer comes from. For bigger questions, deep research gathers and summarizes information into a full report. Chat with your files and photos Snap a photo, pick from your library, or upload a document and ask Merlin about it. Everything you upload is kept in your Vault, ready to reuse in any chat. Create images and videos Generate and edit images, and turn your ideas into short videos with optional audio. Choose the duration and aspect ratio, then save or share the result. Crafts Ask for code, a diagram, a web page, or a small interactive app, and Merlin builds it as a Craft you can preview right in the chat and share with a link. Projects Organize related chats into projects, add files as project knowledge so Merlin keeps the context, and invite others to view or edit with you. Made for your phone - Dictate your messages instead of typing - Get answers in the language you prefer - Light and dark appearance - Share chats with a link Start for free with daily queries. Upgrade to Merlin Pro for higher limits and access to Pro models. AI responses can be inaccurate. Check important information before relying on it. Privacy Policy: https://www.getmerlin.in/privacy-policy Terms and Conditions: https://www.getmerlin.in/terms-and-conditions

About

Ninja AI

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
Read full description

Meet Ninja AI, your All In One AI Assistant with 40 Premium Models • Ninja mode for everyday AI tasks • SuperNinja Agent for autonomous projects on its own computer Why Ninja AI • Dual AI Experience: • Ninja Chat Agent powered by GPT 5, Claude Sonnet, Gemini Pro, DeepSeek, Grok • SuperNinja Agent on its own computer for complex work • Blazing Fast Performance: • Up to 3000 tokens per second • Five to ten times faster than competitors • Parallel task execution with no waiting • Every AI Model You Need: • OpenAI GPT 5, GPT 4.1, DALL E 3 • Anthropic Claude 3.7 Sonnet and Haiku • Google Gemini 2.5 Pro and Flash • DeepSeek R1 and V3 • Amazon Nova Pro, Canvas and Reel • Meta Llama 4 Scout and Maverick • Plus FLUX, Mistral, Stable Diffusion and more SuperNinja Agent Capabilities • Build Complete Websites: • Describe your vision and SuperNinja codes and deploys your site with full functionality on its own computer • Create Business Tools: • Generate dashboards, spreadsheets, presentations and documents • Conduct Deep Research: • Get comprehensive reports with citations and insights • Generate Production Ready Code: • From single scripts to full applications Ninja Chat Agent Features • Answer Any Question: • Real time search or deep research on any topic • Write and Create Content: • Generate posts, emails, articles and marketing materials • Create Stunning Visuals: • AI images with DALL E 3, FLUX Pro, Imagen 4 Ultra, Amazon Nova Canvas, Stable Diffusion XL • Generate Videos: • Dazzling videos with Amazon Nova Reel • Turn Text into Podcasts: • One click conversion into high quality audio • Analyze Files: • Upload and analyze text, images, PDFs and reports • Code Generation and Debugging: • Create and debug code in Python, JavaScript, C++ and more • Automate Meeting Scheduling: • Connect Gmail and let Ninja schedule meetings • Built in Editor: • Workspace to create, refine and manage writing or code • Compare Mode: • View results from any two AI models side by side Perfect For • Developers accelerating development cycles • Entrepreneurs conducting market research and creating materials • Students building projects without coding experience • Researchers analyzing and synthesizing information • Content Creators generating multi format outputs • Business Professionals automating workflows Get Started Today • Experience Ninja mode for quick AI tasks and SuperNinja Agent on its own computer for full projects • Download now and transform how you work with AI Web App: https://super.myninja.ai/ Learn More: https://www.ninjatech.ai/ Terms: https://www.ninjatech.ai/terms-of-service

Screenshots

Merlin AI4 screens
Ninja AI4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Merlin AI versus Ninja AI: the parameters behind the verdict, then further details
ParameterMerlin AINinja AI
PriceFreeFree
Rating4.5 (790 ratings) — better4.0 (53 ratings)
Positive reviews42.8% of reviews54.9% of reviews — better
Number of ratings790 — better53
Update frequencyEvery 10 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.415.1 — better
Further details — not scored
Size102 MB61 MB
Age rating17+12+
DeveloperFoyer Tech, IncNinjatech AI, Inc

Customer experience

Merlin AI

All ratings790 ratings
Positive87.5%
Neutral3.0%
Negative9.5%
Written reviews215 reviews
Positive42.8%
Neutral9.3%
Negative47.9%

Ninja AI

All ratings52 ratings
Positive71.2%
Neutral7.7%
Negative21.2%
Written reviews51 reviews
Positive54.9%
Neutral7.8%
Negative37.3%

User reviews

Merlin AI

From 790 App Store ratings

What we love

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

Room to improve

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

Ninja AI

From 53 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Merlin AI

Reported bugs

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

Requested features

5 requests
  • 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

Reported bugs

2 issues
  • Crashes and freezes reported
  • Compatibility issues with older devices

Requested features

2 requests
  • Implement delete option for chat history
  • Add Chinese language support

In-app purchases

10 purchases

Merlin AI

Subscriptions7
  • Merlin Pro Weekly$9.997 Days
  • Weekly Merlin Unlimited$10.007 Days
  • Monthly Merlin Unlimited$15.001 Month
Show 4 more
  • Merlin Pro Monthly$20.001 Month
  • Yearly Black Friday$89.991 Year
  • Yearly Merlin Unlimited$100.001 Year
  • Yearly Merlin Unlimited$150.001 Year
One-time3
  • TopUp - 1500 Queries, 7 Days$3.49
  • TopUp - 3000 Queries, 30 Days$4.99
  • TopUp - 10000 Queries, 30 Days$14.00
7 purchases

Ninja AI

Subscriptions7
  • Standard$5.001 Month
  • Pro$10.001 Month
  • Ultra$15.001 Month
Show 4 more
  • SuperNinja Standard$19.001 Month
  • SuperNinja Pro$29.001 Month
  • SuperNinja Ultra$49.001 Month
  • SuperNinja Max$149.001 Month

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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