QuillBot: a limited free tier; full use is paid. The 2 options below are free to start or open source; for each one, what you gain and what you lose is written from its official sources.
Output quality is not compared here. The differences come from each tool's own pages: setup, hardware, license, free limits, commercial use. To see which one suits you, try both on the same task. How tools are selected
| QuillBotpaid | ChatGPT | DeepSeek | |
|---|---|---|---|
| Access | Free tier | Free tier | Free |
| Where it runs | In the browser / app (cloud) | In the browser / app (cloud) | In the browser / app (cloud) |
| Free limit | 100 words and 2 modes for paraphrasing, 1,200-word summaries, basic grammar correction | Unlimited text chat with GPT-6 (subject to abuse guardrails); messages and file uploads, images, voice chat, deep research and Codex are limited | Free; no limit stated |
| Price | Premium: the equivalent of $4.17/month; this figure is the annual plan divided by month (paid annually up front), and the monthly price is higher | Go: $8/month (may include ads); Plus: $20/month; Pro: $100/$200/$500 | Free |
| Info as of | Oct 1, 2026 | Oct 8, 2026 | Oct 1, 2026 |
— : not checked. Details are in the cards below.
Difference: On the free plan it rewrites and summarizes with no word limit (subject to abuse limits). Instead of picking a tone or mode, you describe what you want in writing.
Best for: People who want to rewrite text longer than 100 words
A general AI assistant that helps with almost any task: writes, summarizes, makes images, researches.
What sets it apart: Brings chat, images, voice, deep research and coding together in one app.
For: Everyone. One of the easy starting options for general writing and Q&A.
Difference: Free rewriting and summaries. Data is stored in China; do not enter text that belongs to clients.
Best for: People rewriting publicly available text
A completely free chat assistant: writing, code and logic questions.
What sets it apart: No subscription; strong on questions that need reasoning.
For: People looking for a free assistant.
Rewrites text in different wording, summarizes and translates.
What sets it apart: Rewrites the same text in different tones; detects AI-written text.
For: Students and content writers.
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