Comparison

Sirius 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

Sirius

Create personalized AI models and chat with your documents. Get instant answers from PDFs and TXTs, and build AI personas with unique tones and expertise. Experience fast, accurate responses powered by advanced intelligence.

Highlights
  • Chat with PDF and TXT files
  • Create custom AI personas
  • Personalized AI models
  • Advanced AI intelligence
  • Fast and accurate responses
Features
Read full description

Unlock Your Second Brain with Sirius. Don't just chat with AI—build it. Sirius allows you to create personalized AI models tailored to your specific needs. Chat with Documents: Upload PDF/TXT files and get instant answers based on your files. Custom AI Creation: Build an AI persona with a unique tone and expertise. Advanced Intelligence: Experience lightning-fast, accurate responses powered by next-gen models.

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

Sirius4 screens
Ninja AI4 screens

Verdict

The call

The clearest difference is review sentiment: Sirius at 100% against Ninja AI's 56%. Sirius also leads on rating (5.0 vs 4.0). Ninja AI's advantage is ratings volume (52 vs 2). 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. Sirius sells 2 in-app purchases, starting at $6.99 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

Sirius holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Ninja AI has 52 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of Sirius's written reviews are positive against 56% of Ninja AI's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on June 1, 2026 and September 8, 2026 respectively.

Scorecard3 real differences · 7 level
Sirius versus Ninja AI: the parameters behind the verdict, then further details
ParameterSiriusNinja AI
PriceFreeFree
Rating5.0 (2 ratings) — better4.0 (52 ratings)
Positive reviews100.0% of reviews — better56.0% of reviews
Number of ratings252 — better
Update frequencyFortnightlyFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size107 MB61 MB
Age rating17+12+
DeveloperFURKAN ZEKIRINinjatech AI, Inc

Customer experience

Sirius

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews11 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Ninja AI

All ratings52 ratings
Positive71.2%
Neutral7.7%
Negative21.2%
Written reviews50 reviews
Positive56.0%
Neutral8.0%
Negative36.0%

Bugs and requests

Sirius

Not enough reviews yet to summarise bugs or requests.

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

2 purchases

Sirius

Subscriptions2
  • Weekly$6.997 Days
  • Monthly$19.991 Month
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 Sirius free?
Sirius 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, Sirius or Ninja AI?
Sirius is rated higher. Sirius averages 5.0 out of 5 from 2 ratings, while Ninja AI averages 4.0 from 52 ratings.
Do Sirius or Ninja AI have ads?
Neither Sirius nor Ninja AI shows ads.
Which is updated more often, Sirius or Ninja AI?
Sirius ships an update fortnightly, and Ninja AI fortnightly. Most recently, Sirius was updated on June 1, 2026 and Ninja AI on September 8, 2026.

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