Should you build your own QuillBot?
AI paraphrasing, grammar, summarization, and writing tools
A paraphraser/summarizer/grammar wrapper over an LLM and LanguageTool is easy to build; the paid app wins on UX, extensions, plagiarism workflows, and bundled tools.
ENOriginal research content in English. Original prompt preserved in English.
Build me a local paraphrasing and grammar tool to replace QuillBot. Requirements:
- A local web page on localhost:5170: Node + Express, one textarea in, one output pane,
buttons for Paraphrase, Summarize, Fix grammar, and a tone select (standard, formal,
casual, shorter).
- Paraphrase, summarize, and tone modes call an LLM (Anthropic or OpenAI key in .env)
with a fixed prompt per mode; stream the output.
- Grammar mode calls a local LanguageTool server and lists each issue with its suggested
fix, click to apply. No LLM needed for grammar.
- A diff view between input and output with word-level highlights (the `diff` npm
package).
- Every run saved to SQLite via better-sqlite3: timestamp, mode, input, output. A
history page lists the last 100 with copy buttons.
- Cmd+Enter runs the selected mode.
- No accounts, no telemetry; text leaves my machine only for LLM calls, grammar checking
stays fully local.
- Out of scope: browser and Word extensions, plagiarism and AI detection. This lives in
one tab.
- README: LanguageTool setup (needs Java or Docker) and which API key to add.The prompt opens pre-filled in your agent. Review it before running. · this prompt is generated from the build plan · improve it via PR
What would building your own look like?
Create text boxes for paraphrase/summarize/grammar, call an LLM and LanguageTool, and save/export outputs.
What you will need
- LLM API
- LanguageTool or grammar API
- browser extension if in-app writing is needed
They pay because it is available where they write and has purpose-built controls.
xbrowser/Word extensions
xplagiarism/AI detector workflows
xrewrite modes
xhistory
xpolish
xaccount sync
Prefer something ready-made?
Page AssistA browser sidebar that reads the page, rewrites the selection, and saves custom actions; your local model does the thinking.Open source↗
Writing ToolsSelect text anywhere, hit a hotkey, and fix, rewrite, summarize, or obey a custom instruction without opening another tab.Open source↗
WitsySystem-wide selected-text commands, reusable experts, a scratchpad, and document context; bring the model and skip the subscription.Open source↗View all 4 alternatives to QuillBot →· Licença, instalação e limitações em cada alternativa.
How much does QuillBot cost?
- Monthly billing
- $19.95/mo$19.95/mo
- Per year
- $239/yr$239/yr
- Annual billing
- $99.96/yr58% cheaper than paying monthly
- On a Brazilian card, with 3.5% IOF
- R$104/moR$522/yr
Saved to My list. You will see a notice on this site when the price changes.
You complete the purchase on QuillBot’s site. Vibe Radar does not handle payments.
| Plan | Monthly | Annual (per month) | What is included |
|---|---|---|---|
| free | $0 | $0 | 125 words/paraphrase; 1,200 words/summarization input; 20 AI Chat queries/day; 10 AI-detector scans/day up to 1,200 words; 3 image generations/day; 10 MB Flow storage. |
| premium | $19.95≈ $19.95 | $8.33≈ $8.33 | Unlimited paraphraser, AI Chat, and AI-detector use; 6,000 words/summarization input; 25,000 plagiarism words/month; 300 images/month; 100 MB Flow storage. |
| team 2-10 seats | - | $8.65/user≈ $8.65 | 2-10 seats; all Premium features; writer-management dashboard; centralized billing. |
| team 11-50 seats | - | $7.69/user≈ $7.69 | 11-50 seats; all Premium features; writer-management dashboard; centralized billing. |
| team 51+ seats | - | $6.73/user≈ $6.73 | 51+ seats; all Premium features; writer-management dashboard; centralized billing. |
Free tier125 words/paraphrase; 1,200-word summarizer; 20 AI Chat queries/day; 10 AI-detector scans/day; 3 images/day
Billing termsindividual Premium is monthly, 3-month, or annual; Team is annual-only
Additional costsPremium's 25,000 monthly plagiarism words do not roll over. Extra packs cost $2.45 for 6,250 words, $8.95 for 25,000, or $19.95 for 62,500; purchased packs roll over until used.
verified 2026-08-12 · source ↗
Is it cheaper to build or buy QuillBot?
Adjust the numbers: hours to build, your hourly rate, running costs and the subscription price.
Over 24 months, subscribing is cheaper.
Starting hours estimated from the analysis (one sitting). Does not price what you give up (support, integrations, security).
Can I rebuild QuillBot?
Yes. A competent AI coding agent (Claude Code, Codex, Cursor) can build a usable personal QuillBot replacement in one session with the prompt on this page. It runs on your own machine or server with no subscription.
How much does QuillBot cost?
QuillBot costs about $19.95/mo (Premium, checked 07/30/2026), which is $99.96 per year. That’s what you save by replacing it with one prompt.
What do I lose by replacing QuillBot?
Honestly: browser/Word extensions; plagiarism/AI detector workflows; rewrite modes; history; polish; account sync. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to QuillBot?
Yes: Page Assist (A browser sidebar that reads the page, rewrites the selection, and saves custom actions; your local model does the thinking.) Writing Tools (Select text anywhere, hit a hotkey, and fix, rewrite, summarize, or obey a custom instruction without opening another tab.) Witsy (System-wide selected-text commands, reusable experts, a scratchpad, and document context; bring the model and skip the subscription.) All 4 curated free alternatives are at https://viberadar.si/quillbot/alternatives. The prompt is for when you want it exactly your way.