WriteSeed is a polished AI writer with a great template library. If you want a cheaper alternative that you fully own — runs as a Chrome extension on every site you write on, uses your own OpenAI keys, and never has a subscription — PlugThis lets you build your own version in 5 minutes.
WriteSeed is an AI-powered writing tool that helps users generate articles, blog posts, and marketing copy. It launched on AppSumo with a $228 lifetime deal and includes article generation, multiple tone options, and template-based content creation.
Pricing: WriteSeed offers a $228 lifetime deal on AppSumo. Standard pricing is subscription-based, with monthly plans for ongoing users.
Audience: Content marketers, bloggers, and small business owners who write regularly and want AI-assisted drafts.
| Feature | PlugThis | WriteSeed |
|---|---|---|
| Pricing model | From $29/month | $228 lifetime (was on AppSumo) |
| AI provider | Bring your own keys (OpenAI, Anthropic, Groq) | WriteSeed-managed AI provider |
| Source code access | Full source, fully editable | Closed SaaS |
| Customization | Unlimited — modify any feature | Limited to built-in templates |
| Where it runs | Chrome extension on every site | WriteSeed dashboard (separate workflow) |
| Templates | Build your own (or none) | 12+ pre-built templates |
| Support and updates | PlugThis support, you own updates | WriteSeed team maintains |
| Vendor lock-in risk | None — extension runs locally | If WriteSeed shuts down, access ends |
Build time: Under 10 minutes including iteration
What you get:
Build a Chrome extension called "AI Writer Pro" that adds AI writing assistance to every webpage. The extension should: (1) inject a small floating "++" button in any text input or textarea on any webpage when focused, (2) when clicked, show a popup with options: continue writing, change tone (formal, casual, persuasive, professional, friendly, witty, empathetic, authoritative), expand text, summarize, fix grammar, (3) when an option is selected, send the text from the input plus the chosen action to OpenAI GPT-4 and replace the input content with the AI response, (4) provide an options page where the user enters their OpenAI API key, picks default tone, and selects which sites to enable on, (5) cache the user's recent generations in chrome.storage so they can undo. Permissions: storage, activeTab, contextMenus. Host permissions: <all_urls>, https://api.openai.com/*. Manifest V3 with content script.
$228 lifetime (AppSumo) or subscription on writeseed.com
From $29/month + your own OpenAI key (~$5-20/month for typical use)
PlugThis is a flexible monthly subscription — cancel any time. You own the extension you build, switch AI providers freely, and never pay markup on AI usage.
QuillAI alternative — build your own AI writing Chrome extension with PlugThis. from $29/month, your own AI keys, full source code.
Wordtune alternative — build your own AI rewriting Chrome extension with PlugThis. from $29/month, no subscription, your own API keys.
Paste the prompt above into PlugThis and ship your custom version in minutes.
Disclosure: PlugThis is a competing product to WriteSeed. This comparison is intended for users actively evaluating both options. We last verified the WriteSeed information on this page on 2026-05-14. Pricing and features may have changed since — please check the WriteSeed website for current details.
For core AI writing — generation, tone shifting, expansion, grammar — yes. PlugThis uses GPT-4 (or whichever model you bring keys for), which is what most AI writers use under the hood. WriteSeed has more pre-built templates out of the box; if templates matter to you, you can build them yourself with additional prompts in PlugThis or stick with WriteSeed.
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PlugThis starts at $29/month and is cancel-anytime. AI usage is pay-as-you-go via OpenAI — typical writers spend $5–20/month. You own the code, can switch AI providers anytime, and the extension you've built keeps working on your machine even if you cancel.
Yes. Iterate on the build prompt to add a templates feature — PlugThis can build a sidebar with a template library, custom prompts per template, and saved-template management.
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If WriteSeed works for you, use WriteSeed. The reasons to build your own: you want to own the code, you want a Chrome extension that runs on every site instead of a separate dashboard, you want to use a non-OpenAI model (like Claude or local LLMs), you don't want subscription dependency, or you want to customize the workflow beyond what WriteSeed allows.
More answers below.