iMark · Image Annotation Tool vs OpenCat
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iMark · Image Annotation Tool
Enhance and annotate images with a comprehensive set of tools. Import from your photo library, camera, or maps, and customize your markups with various styles. Easily export and share your creations.
- Diverse annotation tools (arrow, text, mosaic, etc.)
- Import from photo library, camera, and maps
- Customizable color schemes and history sessions
- Crop and layer management
- Export with custom image size
- Supports iOS Photo Extension
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iMark is a simple & powerful image annotation tool. iMark supports various tools & styles. You could import photo from photo library, camera & map. · All Tools You Need: Arrow, Rect, Circle, Text, Magnifier, Mosaic, Pen, Spotlight · Create annotations from photo library, map or empty canvas · Easy Export: Export with custom image size. Share with your friends. · Customize: History sessions, custom color schemes, redo & undo action. · Advanced Feature: Crop & Layer Management · Supports iOS Photo Extension · Supports Home Screen 3D Touch Quick Action · Supports iPad Multitasking
OpenCat
This AI utility tool offers seamless integration of advanced AI models into your daily routine on Mac, iPhone, and iPad. It features a user-friendly interface, keyboard extensions for in-app AI access, and Siri/shortcut integration for automation. Supports a wide range of popular AI models and offers team deployment options.
- Support for latest popular AI models
- Keyboard extensions for in-app AI
- Realistic voice synthesis
- Siri and shortcut integration
- Team deployment with Docker
- Customizable AI parameters
- Markdown content rendering
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Bring AI into every part of your workflow: chat, writing, translation, and search. · Multiple model options — local models, API Key, Cloud subscription, Apple Intelligence · MCP — supports MCP and tool calls · Web search — available on OpenCat Cloud and select providers · System-wide translation — select text in any app for instant AI translation · Content rendering — supports LaTeX formulas, Markdown, and code highlighting · Cross-platform — natively built for Mac, iPhone, and iPad · Data privacy — stored locally, synced across devices via iCloud [Pro Features] · AI Keyboard — invoke AI right in the text field of any app to polish or reply in one step · OpenCat Cloud subscription provides access to all major models [A Variety of Models] · OpenCat Cloud — fast access to leading models · Local models — one-tap download of open-source models for offline use, accelerated by Apple silicon · BYOK — use your own API Key, including Coding Plan · System models — supports Apple Foundation Models [OpenCat Cloud — Ready to Use, No Setup] · No sign-up, zero configuration, all major models supported · 50+ models — ChatGPT, Claude, Gemini, Grok, DeepSeek, GLM, MiniMax, Kimi, Qwen, Doubao, and more, all in one place · Online search supported [System-Level AI Translation] Set OpenCat as your default translation app to translate selected text directly in Safari, Mail, Notes, and any other app. Powered by large language models, translations are natural and fluent — far superior to traditional translation engines. [Local Models, Offline Inference] · One-tap download — popular open-source models like Llama, Qwen, and Gemma · Apple silicon acceleration — built on Apple's official MLX framework, fully leveraging GPU performance for fast, energy-efficient inference · Fully offline — works without internet, conversation data never leaves your device [Use Your Own API Key] · 25+ providers supported — OpenAI, Claude, Gemini, DeepSeek, Kimi, Qwen, Doubao, ERNIE, and more [Contact Us] Email: support@dreamoon.ai Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy & Third-party AI Service Privacy Policy https://opencat.app/privacy
Screenshots
Verdict
The clearest difference is update cadence: OpenCat at weekly against iMark · Image Annotation Tool's every 2 months. iMark · Image Annotation Tool's advantage is iOS requirement (13.0 vs 17.0). On price, rating, review sentiment and ratings volume 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
Both are free to download. iMark · Image Annotation Tool sells 4 one-off in-app purchases and OpenCat sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.6 for iMark · Image Annotation Tool against 4.6 for OpenCat. Both are backed by a comparable volume of ratings — 384 and 855 respectively. Written reviews are what separate them: 72% of iMark · Image Annotation Tool's written reviews are positive against 65% of OpenCat's.
iMark · Image Annotation Tool ships an update every 2 months, OpenCat weekly. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.
| Parameter | iMark · Image Annotation Tool | OpenCat |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (384 ratings) — better | 4.6 (855 ratings) |
| Positive reviews | 71.7% of reviews — better | 64.6% of reviews |
| Number of ratings | 384 | 855 — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 93 MB | 96 MB |
| Age rating | 4+ | 17+ |
| Developer | iDaily Corp. | Early Moon, LLC |
Customer experience
iMark · Image Annotation Tool
OpenCat
User reviews
iMark · Image Annotation Tool
From 384 App Store ratingsWhat we love
- 👍 Intuitive and easy-to-use interface
- 🎨 Comprehensive annotation tools (arrows, shapes, text, magnifier)
- 💰 Completely free with no ads
- 🎯 Powerful features for screenshot markup
- 🔧 Customizable colors and styling options
Room to improve
- 💧 Persistent watermark on all saved images
- 🌐 Language defaults to Chinese with difficult switching
- 📝 Text size limitations on large images
- 🎨 Limited font customization options
- ⚙️ Text bubble tail control is limited
OpenCat
From 855 App Store ratingsWhat we love
- 🚀 Fast and responsive
- 👍 Convenient and user-friendly
- 💡 Customizable API integrations
- 🌐 Syncs across devices
- 🎨 Clean and visually appealing design
Room to improve
- 🐛 Bugs and performance issues
- 🔒 Lack of custom API support
- 💻 Compatibility issues with older devices/OSes
- 🗂️ Difficulty managing conversations
- 📤 Inability to export chat data
Bugs and requests
iMark · Image Annotation Tool
Reported bugs
8 issues- App crashes when using brush/pen features
- Export button hidden by system UI
- Annotations disappearing after one day
- Keyboard engagement obscures image during text input
- Magnifier tool functionality issues
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- In-app review text not visible while typing
- Slow performance with multiple markups
- UI elements not accessible (white buttons on white background)
Requested features
18 requests- Ability to remove watermark (paid option requested)
- Multiple language support with easy switching
- Filled/solid geometric shapes
- Curved arrows instead of straight only
- Multiple font selection from Google Fonts
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- Text formatting (bold, italic, underline, strikethrough)
- Opacity/transparency control for colors
- Redaction/censoring tool for sensitive information
- Thinking bubbles with text capability
- Counter/numbering feature for annotations
- Copy/duplicate annotation elements
- Dark mode theme option
- Ability to import multiple images as layers
- Thinner line options for shapes and tools
- Rounded rectangle shape option
- Magnifier with square frame option
- Undo/redo history management
- Separate watermark and signature settings
OpenCat
Reported bugs
6 issues- Streaming response disruptions
- Disappearing API key input fields
- Inconsistent Markdown rendering
- Keyboard extension not working as expected
- Sync issues between devices
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- Crashes and freezes when handling large inputs
Requested features
7 requests- Support for more AI models (e.g., Ollama, Groq)
- Markdown rendering for chat responses
- Ability to upload images and files
- Customizable keyboard extensions
- Background task support for long-running queries
Show 2 moreShow fewer
- Prompt library and sharing functionality
- Integration with other productivity apps (e.g., Shortcuts)
In-app purchases
iMark · Image Annotation Tool
- Coffee$2.99
- Silver Coin$5.99
- Gold Coin$14.99
Show 1 moreShow fewer
- Coffee for Everyone$29.99
OpenCat
- Cloud AI3 Days trial$3.991 Month
- Cloud AI$24.991 Year
- Tokens Package$5.99
- OpenCat Pro$9.99
Questions
Is iMark · Image Annotation Tool free?
Is OpenCat free?
Which has better reviews, iMark · Image Annotation Tool or OpenCat?
Do iMark · Image Annotation Tool or OpenCat have ads?
Which is updated more often, iMark · Image Annotation Tool or OpenCat?
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