QuillAI is a focused content tool with strong SEO features. If you write long-form content and want to own the workflow end-to-end — Chrome extension that works on every site, your own AI keys, custom templates, full source — PlugThis lets you build it.
QuillAI is an AI writing tool that helps users generate, rewrite, and optimize content. It offers article generation, tone shifting, and SEO-optimized content writing through a web app and Chrome extension.
Pricing: QuillAI uses a subscription model with monthly and annual plans. Specific pricing varies by tier; check their site for current rates.
Audience: Bloggers, content marketers, SEO writers, and small businesses producing regular content.
| Feature | PlugThis | QuillAI |
|---|---|---|
| Pricing | From $29/month | Monthly/annual subscription |
| AI provider | Bring your own keys | QuillAI-managed |
| Source code | Full source | Closed |
| Long-form generation | Build it | Optimized for it |
| SEO features | Build them (real-time analytics) | Built-in |
| Templates | Build your own | 12+ pre-built |
| Where it works | Any text field on any site | QuillAI dashboard primarily |
| Output ownership | Your text, your AI provider, your code | Generated through QuillAI |
Build time: About 15 minutes (the article writer is a more complex extension)
What you get:
Build a Chrome extension called "Long Form Writer" for AI content generation. The extension should: (1) provide a popup with a "New Article" button that opens a writing dashboard in a new tab, (2) the dashboard has: topic input, tone selector (8 options), length selector (short/medium/long), template selector (blog post, listicle, how-to, opinion, news), and a "Generate" button, (3) on generate, send all parameters to OpenAI GPT-4 with a structured prompt to produce a 1000+ word article with sections, headings, and a conclusion, (4) display the result in a rich text editor with an SEO sidebar showing: word count, heading count, paragraph count, target keyword density, reading difficulty, (5) include a "Continue Writing" button to extend the article and an export button (Markdown, HTML, plain text), (6) options page for OpenAI API key. Permissions: storage. Host permissions: https://api.openai.com/*. Manifest V3.
Monthly/annual subscription (varies by tier)
From $29/month + ~$10–30/month OpenAI usage for active writing
Vs typical AI writer subscription ($20–50/month), PlugThis breaks even within 3–6 months.
WriteSeed alternative — build your own AI writing extension with PlugThis for from $29/month. Full source code, no subscription, in 5 minutes.
Wordtune alternative — build your own AI rewriting Chrome extension with PlugThis. from $29/month, no subscription, your own API keys.
Closely alternative — build your own LinkedIn outreach Chrome extension with PlugThis. from $29/month, your own automation rules.
Glasp alternative — build your own web highlighter Chrome extension with PlugThis. Private highlights, AI summaries, from $29/month.
Paste the prompt above into PlugThis and ship your custom version in minutes.
Disclosure: PlugThis is a competing product to QuillAI. This comparison is intended for users actively evaluating both options. We last verified the QuillAI information on this page on 2026-05-14. Pricing and features may have changed since — please check the QuillAI website for current details.
GPT-4 is the foundation under most AI writers, including likely QuillAI. With a well-structured prompt, GPT-4 produces comparable long-form output. QuillAI may have refinements layered on top, but for most users the difference is marginal.
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Yes. Iterate on the build prompt to add: keyword research integration, competitor SERP analysis, internal link suggestions, schema markup generation. Each feature is a few more lines in the prompt.
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Ranking depends on content quality, niche competition, and many other factors — not on which AI wrote the draft. AI-assisted content with human editing is the current best practice. PlugThis-built tools support this workflow.
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