Sketch Simply vs Ninja AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sketch Simply
This app serves as a digital sketchbook for brainstorming, rough designs, and idea recording. It offers Apple Pencil support to prevent accidental touch drawings and automatically backs up and synchronizes sketches across devices via iCloud. Archived books can be shared as PDFs or used for collaboration.
- Digital sketchbook for ideas and designs
- Apple Pencil support for precise drawing
- Automatic iCloud backup and synchronization
- Share sketches as images or PDF archives
- Collaborative whiteboard feature via AirPlay
- Draw in color with an in-app purchase
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Use SkBk for brainstorming, rough design sketches and making a record of your ideas. Indicate if you're using an Apple Pencil in order to avoid inadvertent hand, wrist, knuckle and finger touch drawings. With an iCloud account, your sketches and archives will be backed up automatically. You'll never lose your sketches. Archived books can be shared to other PDF reading apps. What's more, with an iCloud enabled account, your sketches and archives will be synchronized across all your iCloud enabled devices. Use Air Play on your iPad or iPhone to an Apple TV and use it as a white board for collaboration. Then share the images or pages with the collaborators and others. Features: Draw on a single page in portrait, or on two pages at once in landscape orientation. Undo prior strokes. Defaults automatically to use iCloud to back up and synchronize your sketch book across devices. This preference can be turned off in the Settings app. Indicate the use of the Apple Pencil for improved drawing, eliminating unintended strokes between hand touches and the Apple Pencil touches. Share your drawings as images, your pages¹ with other SkBk users, and your archives¹ with other people or PDF capable apps. Draw in color¹. Menu of options: - Share an image. - Share a page. - Enable Undo. - Draw in color.¹ - Archive a book of sketches as a PDF document. Books can have up to 122 pages. - View and manage book archives. Books can be individually shared¹ and removed from the archives. Footnotes: 1) Selecting color drawing requires a one time in app purchase.
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.
- 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
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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
Verdict
The clearest difference is price: Ninja AI at Free against Sketch Simply's $0.99. Ninja AI also leads on rating (4.0 vs 3.6) and ratings volume (52 vs 5). On review sentiment, 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
Ninja AI is free to download; Sketch Simply costs $0.99 up front. Sketch Simply sells 1 one-off in-app purchase 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.
Ninja AI holds the better App Store score, 4.0 against 3.6. That said, the two scores are not equally well evidenced: Ninja AI has 52 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 50% of Sketch Simply's written reviews are positive against 56% of Ninja AI's.
Sketch Simply ships an update every 11 days, Ninja AI fortnightly. The most recent releases landed on June 1, 2026 and September 8, 2026 respectively.
| Parameter | Sketch Simply | Ninja AI |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.6 (5 ratings) | 4.0 (52 ratings) — better |
| Positive reviews | 50.0% of reviews | 56.0% of reviews — better |
| Number of ratings | 5 | 52 — better |
| Update frequency | Every 11 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 1 MB | 61 MB |
| Age rating | 4+ | 12+ |
| Developer | Montiel Mobile, LLC | Ninjatech AI, Inc |
Customer experience
Sketch Simply
Ninja AI
Bugs and requests
Sketch Simply
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
Sketch Simply
- Draw in Color$2.99
Ninja AI
- Standard$5.001 Month
- Pro$10.001 Month
- Ultra$15.001 Month
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- SuperNinja Standard$19.001 Month
- SuperNinja Pro$29.001 Month
- SuperNinja Ultra$49.001 Month
- SuperNinja Max$149.001 Month
Questions
Is Sketch Simply free?
Is Ninja AI free?
Which has better reviews, Sketch Simply or Ninja AI?
Do Sketch Simply or Ninja AI have ads?
Which is updated more often, Sketch Simply or Ninja AI?
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