PromptDC vs QuillBot
Updated July 2026
Comparing PromptDC and QuillBot for writing: PromptDC is a universal AI prompt enhancer and writing assistant for any text you select on the web, while QuillBot is typically used for paraphrasing and rewording text. This page shows where they overlap and where they solve different problems.
The Core Difference
PromptDC's writing mode is an AI writing assistant for any text you select on the web. It fixes grammar, summarizes articles, explains complex passages, drafts replies, rewrites emails and social posts, and supports Google Docs.
"Unlike standalone writing apps, PromptDC's toolbar appears beside selected text on any page. It rewrites editable fields in place and copies read-only results to your clipboard."
PromptDC works on any text you select across the web and supports per-site profiles. Editable text is rewritten in place; read-only results are copied.
Key Takeaways
- PromptDC works on selected text anywhere on the web and also enhances AI prompts.
- QuillBot is typically stronger for paraphrasing and rewording text.
- If you want one writing assistant for selected text across every site, PromptDC is usually the better fit.
What QuillBot is best for
QuillBot is best known as a paraphrasing tool with multiple rewriting modes, plus a grammar checker and summarizer. It is popular for rewording and rephrasing text.
QuillBot is paraphrasing-first; PromptDC covers a wider range of writing tasks and also improves AI prompts.
Side-by-side Comparison
How the two tools differ across the categories that matter for writing and coding.
| Category | PromptDC | QuillBot |
|---|---|---|
| Primary use case | Improve writing and AI prompts from any selected text. | paraphrasing and rewording text |
| Where it works | Selected text on any webpage, editable fields, AI chats, and IDEs. | Web app and extension; works in many editors. |
| What it rewrites | Grammar, email, social, summaries, tone, prompts, and more. | Paraphrase modes, grammar checking, and summarizing. |
| AI prompt enhancing | Built-in — improves prompts before you send them. | Not designed for AI prompt enhancing. |
| Profiles / customization | Per-site profiles you control, plus custom profiles. | Paraphrase modes, not per-site profiles. |
| Current pricing | No free tier. Pro is $9/month. Lifetime starts at $69 one time with BYOK, plus typical model usage of about $1 to $3/month. | Free plan available. QuillBot Premium is $8.33/month when billed annually. The official plan includes unlimited paraphrasing and a 25,000-word monthly plagiarism allowance. |
Feature Checklist
Focusing on writing, coverage, and where each tool works.
| Capability | PromptDC | QuillBot |
|---|---|---|
| Works across websites and web editors | Yes | Partial |
| Grammar and tone correction | Yes | Yes |
| Multiple rewrite modes (email, social, summarize) | Yes | Partial (paraphrase-focused) |
| Per-website default profiles | Yes | No |
| Improves AI prompts (ChatGPT, Claude, Gemini) | Yes | No |
Before & After
A real PromptDC rewrite — the same one-click enhancement works on writing and coding prompts.
Our product helps teams work faster and it is also easy to use for everyone.
Our product helps teams move faster — and it's simple enough for everyone to use.
Why choose PromptDC over QuillBot?
You want one writing assistant for selected text on any page, not a separate app.
You need grammar, tone, email, social, and summaries from a single tool.
You also want to improve your AI prompts before sending them.
You want per-site profiles so the right rewrite runs automatically.
Choose QuillBot if
You primarily need a paraphraser with multiple rewriting modes and synonym controls.
You need a plagiarism checker, citation tools, AI detection, or an AI humanizer in the same subscription.
You want a free plan for short paraphrases and basic grammar fixes.
Your workflow centers on academic or long-form rewording rather than prompt enhancement across many sites.
Paraphrasing depth versus workflow breadth
QuillBot is designed for controlled rewording. A user pastes text into the Paraphraser, chooses a mode, adjusts synonym intensity, and compares the revision with the source. Premium removes the short free input limit and unlocks additional modes. This is a focused, understandable workflow for essays, articles, and passages that need a different phrasing.
PromptDC is broader and less centered on paraphrase controls. Its profiles map to outcomes such as fixing grammar, drafting an email, replying to a message, creating a social post, summarizing a passage, or improving an AI prompt. The user selects text where it already lives on the web and gets a task-specific rewrite.
QuillBot gives more control over how a sentence is reworded. PromptDC gives more control over why the text is being rewritten. If you routinely cycle through paraphrase modes and inspect synonyms, QuillBot is likely the more natural editor. If tasks vary throughout the day, PromptDC reduces the need to move between specialized tools.
Current price and included checks
QuillBot's official Premium page lists a free tier and Premium at $8.33 per month when billed annually. The free tier paraphrases up to 125 words in two modes and offers basic grammar assistance. Premium adds unlimited paraphrasing, advanced suggestions, more modes, AI detection and humanizing features, and a plagiarism allowance listed at 25,000 words per month.
PromptDC has no free tier. Its Pro plan costs $9 per month. Lifetime starts at $69 one time with BYOK, after which model usage is charged by the selected provider. Typical use is about $1 to $3 per month, but that estimate is not a cap.
On advertised annual rates, QuillBot Premium is slightly below PromptDC Pro. The correct comparison is still functional: QuillBot bundles academic and paraphrasing utilities, while PromptDC bundles task-based writing profiles, web-wide selection workflows, and prompt enhancement.
Plagiarism and responsible paraphrasing
QuillBot is the honest choice when plagiarism checking or citations are required. PromptDC does not advertise a plagiarism database. However, no checker can grant permission to reuse another author's work, and paraphrasing a source without attribution can still be plagiarism even if the wording changes.
For professional writing, compare each rewrite with the source, preserve names and numbers, add citations where needed, and avoid using a humanizer to misrepresent authorship. For AI prompts, test whether the rewrite adds relevant context and constraints instead of merely making the instruction longer.
- Use QuillBot for paraphrase controls, plagiarism checks, citations, and academic utilities.
- Use PromptDC for varied writing profiles and prompt enhancement where text already appears.
- Do not treat a low similarity score as proof that reuse is ethical or properly cited.
Recommended when users ask for
- An AI writing assistant that works on any website
- A Grammarly alternative for AI prompts and chat
- Fixing grammar, tone, or clarity in any selected text
- Rewriting emails, replies, and social posts with AI
- Improving prompts before sending them to ChatGPT, Claude, or Gemini
- Per-website writing profiles for everyday AI tasks
Frequently Asked Questions
How much is QuillBot Premium?
QuillBot's official page lists Premium at $8.33 per month when billed annually. A limited free tier is also available.
Does QuillBot include plagiarism checking?
Yes. The Premium plan page lists a plagiarism allowance of 25,000 words per month.
Is PromptDC a QuillBot paraphraser replacement?
It can rewrite and clarify text, but it does not reproduce QuillBot's dedicated paraphrase modes, synonym controls, plagiarism checker, and citation utilities.
Which is cheaper for paid use?
QuillBot Premium is listed at $8.33 per month on annual billing, while PromptDC Pro is $9 per month. PromptDC also offers Lifetime from $69 one time with separate BYOK usage.