ParagraphAI vs QuillBot

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Cheaper paid plan: QuillBot — $19.99/mo vs $24.99/mo for ParagraphAI
Free plan: Both have one
Best fit: ParagraphAI: Heavy mobile emailers and messagers · QuillBot: Students and non-native writers rewording essays and emails sentence by sentence
Platforms: ParagraphAI: Web, iOS, Android, Chrome extension · QuillBot: Web, Chrome extension, Windows, macOS, iOS, Android
Trust score: About even — ParagraphAI 89, QuillBot 93

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

ParagraphAIKeyboard-level writing help for phones, browser and email replies

QuillBotParaphrasing, summarising and citation tools for students

Side by side

Fact	ParagraphAI	QuillBot
Category	AI Writing Assistants	Paraphrasing & Rewriting
Pricing model	Freemium	Freemium
Starts at	$24.99/mo	$19.99/mo
Trust score	89 / 100	93 / 100
Platforms	Web, iOS, Android, Chrome extension	Web, Chrome extension, Windows, macOS, iOS, Android
Company	ParagraphAI Inc.	Learneo, Inc.
Launched	2022	—
Last verified	Sep 6, 2026	Sep 6, 2026

What our research says

ParagraphAI

The keyboard is the whole argument: if you write serious volume from a phone it beats copy-pasting into a chatbot. On desktop it is hard to justify $24.99 a month against Grammarly or a general LLM subscription that does more.

Pros

Native iOS and Android keyboard works inside any app, not just a web editor
40+ languages with per-user fluency settings
Free tier is workable for light use at five uses per action per day
Annual billing halves the effective rate to $12.49 a month

Cons

$24.99 on monthly billing sits above Grammarly's consumer tier for a narrower feature set
10,000-character input cap even on Pro, which rules out long documents
No developer API, and team controls only exist on the custom Enterprise plan
Marketing leans on unverifiable Fortune 500 adoption claims

QuillBot

QuillBot remains the fastest way to reword a paragraph you have already written, and the free tier is enough for occasional use; Premium at roughly $8 to $20 a month depending on term buys the extra modes, longer inputs and the plagiarism checker that students actually want. Against a general chatbot it wins on speed and a purpose-built interface, not on writing quality, and against Grammarly it is cheaper but narrower.

Pros

Free tier includes grammar checking, two paraphrase modes, translation and AI detection
Extensions and apps for Chrome, Windows, macOS, Safari, iOS and Android keep it inside the writing surface
Paraphrase modes and a synonym slider give more control than a one-shot rewrite prompt
Backed by Learneo, a large education group, rather than an anonymous operator

Cons

Month-to-month Premium is about 2.4 times the annual rate, so the headline low price assumes a year up front
The site blocks automated access, so none of the figures here come from its own pricing page
The App Store listing itself disagrees on how many Premium paraphrase modes exist (8 versus 10+)
The heavy student use and the AI detector attract academic-integrity scrutiny that can rebound on users

Which one fits

Choose ParagraphAI if you need

Heavy mobile emailers and messagers
Non-native English speakers wanting tone and formality control while typing
Sales and support reps replying from a phone between meetings
Anyone who needs inline translation mid-conversation

Choose QuillBot if you need

Students and non-native writers rewording essays and emails sentence by sentence
Anyone who wants grammar, paraphrase, summary and citation tools in one browser extension
Occasional users, since the free tier handles short rewrites without an account upsell wall