# OpenCat vs Tampermonkey

The clearest difference is price: OpenCat at Free against Tampermonkey's $2.99. OpenCat also leads on rating (4.6 vs 3.1) and update cadence (weekly vs every 5 months). Tampermonkey's advantage is in-app purchases (none vs 4) and chart position (#17 vs unranked). On review sentiment, ads and device support there is nothing between them.

OpenCat is free to download; Tampermonkey costs $2.99 up front. OpenCat sells 4 in-app purchases, starting at $3.99 per month. Tampermonkey asks for nothing beyond the download.

OpenCat holds the better App Store score, 4.6 against 3.1. That said, the two scores are not equally well evidenced: OpenCat has 852 ratings behind it against 61, so its average is the more settled of the two. Written reviews point the same way: 65% of OpenCat's written reviews are positive against 58% of Tampermonkey's.

OpenCat ships an update weekly, Tampermonkey every 5 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OpenCat | Tampermonkey |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.6 (852 ratings)](https://appshunter.io/ios/app/opencat-ai-chat-agent-mcp/id6445999201/reviews)** | [3.1 (61 ratings)](https://appshunter.io/ios/app/tampermonkey/id6738342400/reviews) |
| Number of ratings | **852** | 61 |
| Positive reviews | **64.6% of reviews** | 57.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | — | **#17** |
| Size | 96 MB | 7 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad, Mac | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Early Moon, LLC](https://appshunter.io/developer/1119881923) | [Jan Biniok](https://appshunter.io/developer/1482490088) |

## What reviewers say

### OpenCat

[App page](https://appshunter.io/ios/app/opencat-ai-chat-agent-mcp/id6445999201)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cloud AI | $3.99 | per month |
| Cloud AI | $24.99 | per year |
| Tokens Package | $5.99 | one-time |
| OpenCat Pro | $9.99 | one-time |

**What reviewers like**

- 🚀 Fast and responsive
- 👍 Convenient and user-friendly
- 💡 Customizable API integrations
- 🌐 Syncs across devices
- 🎨 Clean and visually appealing design

**What reviewers complain about**

- 🐛 Bugs and performance issues
- 🔒 Lack of custom API support
- 💻 Compatibility issues with older devices/OSes
- 🗂️ Difficulty managing conversations
- 📤 Inability to export chat data

**Reported bugs**

- Streaming response disruptions
- Disappearing API key input fields
- Inconsistent Markdown rendering
- Keyboard extension not working as expected
- Sync issues between devices

**Requested features**

- 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


### Tampermonkey

[App page](https://appshunter.io/ios/app/tampermonkey/id6738342400)

**Currently charting:** #17 Top Paid · Productivity, #130 Top Paid (US App Store)

Enhance and customize web pages with custom JavaScript programs. This tool allows users to easily create, manage, and run these scripts across all major browsers, adding new features or modifying existing ones on any website.

**Highlights:** Userscript management, Web page customization, JavaScript execution, Cross-browser compatibility, Script creation and editing

**Features:** Safari Extension, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Well executed
- 👍 Essential plugin/extension for all browsers
- 💡 Sync userscripts across browsers
- 👍 Needed this
- 👍 Good

**What reviewers complain about**

- 🐛 Bug on iPad
- 🐛 Glitching on iPad
- 🐛 Unable to install scripts
- 🐛 Unusable on iPadOS
- 🐛 No response on iPad

**Reported bugs**

- Plugins cannot be installed properly
- Screen continuously flickers
- Not usable in Chrome
- Features not working as expected

**Requested features**

- Set cookie feature
- Dark mode option


## Frequently asked questions

### Is OpenCat free?

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

### Is Tampermonkey free?

Tampermonkey costs $2.99, with no in-app purchases.

### Which has better reviews, OpenCat or Tampermonkey?

OpenCat is rated higher. OpenCat averages 4.6 out of 5 from 852 ratings, while Tampermonkey averages 3.1 from 61 ratings.

### Do OpenCat or Tampermonkey have ads?

Neither OpenCat nor Tampermonkey shows ads.

### Which is updated more often, OpenCat or Tampermonkey?

OpenCat ships an update weekly, and Tampermonkey every 5 months. Most recently, OpenCat was updated on November 3, 2026 and Tampermonkey 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.*