Merlin vs ShareGPT: Best ChatGPT Extension Comparison 2025

Merlin vs ShareGPT: Choosing the Right ChatGPT Extension

The landscape of ChatGPT extensions has evolved rapidly, moving from simple utilities to complex productivity suites. Two names that often appear in discussions are Merlin and ShareGPT. While they both reside in the browser, they serve fundamentally different purposes. Merlin aims to be an all-encompassing AI sidekick that follows you across the web, while ShareGPT was built as a specialized tool for capturing and distributing AI conversations. In this comparison, we break down their features, pricing, and current relevance to help you decide which belongs in your browser.

Quick Comparison Table

Overview of Each Tool

Merlin is a comprehensive AI assistant designed to bring the power of ChatGPT Plus to every corner of the internet. It operates as a sidebar or a "floating" interface that allows users to summarize YouTube videos, draft professional emails on Gmail, generate LinkedIn posts, and get AI-enhanced results directly on Google Search. By integrating multiple top-tier models like GPT-4o and Claude 3.5 Sonnet into a single subscription, Merlin positions itself as a central hub for web-based productivity.

ShareGPT is a lightweight, specialized extension focused on the social and collaborative side of AI. Its primary function is to add a "Share" button to the ChatGPT interface, allowing users to generate a permanent, public URL for their conversations instantly. Beyond just sharing, the tool offers a community platform where users can browse "wild" or insightful conversations shared by others, making it a valuable resource for learning how to prompt effectively or for archiving notable AI interactions without taking messy screenshots.

Detailed Feature Comparison

The most significant difference between these tools is their scope of operation. Merlin is "site-agnostic," meaning it functions on any webpage you visit. Whether you are reading a long PDF in your browser or scrolling through Twitter, you can highlight text and ask Merlin to explain, translate, or rewrite it. It also includes specialized "hooks" for platforms like YouTube, where it can provide a timestamped summary of a 20-minute video in seconds. This makes Merlin a proactive tool that assists in the consumption and creation of content across the entire web.

ShareGPT, by contrast, is a utility for the ChatGPT interface itself. It does not provide its own AI logic or models; instead, it captures the output of your existing ChatGPT sessions. Its standout feature is the ability to create clean, readable web pages from your chat logs that preserve formatting, code blocks, and images. While OpenAI has since introduced native "Shared Links," ShareGPT remains popular for its community "Explore" page, which serves as a gallery of what the AI community is currently discovering and testing.

In terms of model variety, Merlin offers a clear advantage for users who want to compare outputs. Within the Merlin sidebar, you can switch between OpenAI’s GPT-4o, Anthropic’s Claude, and Google’s Gemini without needing separate subscriptions for each. ShareGPT does not offer models; it simply records whatever model you are already using on the official ChatGPT site. Therefore, Merlin acts as a "model aggregator," while ShareGPT acts as a "content curator."

Pricing Comparison

• Merlin Pricing: Merlin follows a freemium model. The Free plan typically offers around 102 queries per day (though this can vary by model). The Pro Plan starts at approximately $19/month (billed annually) or $29/month (billed monthly), offering higher limits for premium models like GPT-4 and Claude 3.5. There are also Team Plans starting at $15/user/month for businesses requiring centralized billing and shared credits.
• ShareGPT Pricing: ShareGPT is entirely free and open-source. There are no subscription tiers or usage limits, as the tool does not incur the high API costs associated with generating AI text. It is a community-driven project that relies on its users to contribute to the shared database of conversations.

Use Case Recommendations

Choose Merlin if:

• You want AI assistance on websites other than ChatGPT (e.g., Gmail, LinkedIn, or Research papers).
• You need to summarize long-form content like YouTube videos or blog posts quickly.
• You want access to multiple premium models (Claude, GPT-4, Gemini) under one single monthly bill.
• You are a professional looking to speed up your writing and research workflow.

Choose ShareGPT if:

• You frequently need to share your chat logs with teammates, clients, or on social media.
• You want to explore a public library of prompts and conversations to improve your own AI skills.
• You prefer a free, open-source tool for basic archiving of your ChatGPT history.
• You find OpenAI's native sharing features too restrictive or want a community-centric experience.

Verdict: Which One Should You Install?

If you are looking for a tool that will actually change how you work, Merlin is the clear winner. It is a heavy-duty productivity engine that brings AI to your entire browser, effectively acting as a "Plus" version of the internet. Its ability to summarize, write, and research across all websites makes it worth the subscription price for power users.

However, ShareGPT remains a fantastic, lightweight utility for those who treat ChatGPT as a collaborative or educational tool. While OpenAI's native sharing has made ShareGPT less "essential" than it once was, its community feed is still a goldmine for prompt engineers. Since ShareGPT is free, there is no harm in keeping it alongside Merlin, but for raw utility and AI power, Merlin is the superior choice for most users in 2025.