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Pick two to five tools. Every cell comes from a verified record; anything unverified says so. There is no overall winner — the right choice depends on your task, budget and technical needs.

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Criterion	Perplexity	Grammarly	Notion AI	QuillBot	DeepL
Provider	Perplexity AI	Grammarly (Superhuman)	Notion Labs	QuillBot (Learneo)	DeepL SE
What it is for	An AI answer engine that searches the web and cites sources, with access to models from several providers on paid plans.	An AI writing assistant that checks grammar, tone and clarity wherever you type and can rewrite or generate text on request.	AI built into Notion's workspace for writing, searching, meeting notes and running multi-step agent tasks across your pages.	A suite of writing tools for paraphrasing, summarising, grammar checking and AI detection, popular with students.	An AI translator for text, documents and speech, with a writing assistant and a developer API.
Category	AI Research Tools, AI Chatbots & Assistants, AI Agents & Frameworks, LLM APIs & Model Platforms	AI Writing & Content Creation, AI Productivity Tools, AI Learning & Tutoring	AI Productivity Tools, AI Writing & Content Creation, AI Agents & Frameworks, Enterprise Automation	AI Writing & Content Creation, AI Learning & Tutoring, AI Detection & Plagiarism Checking	AI Writing & Content Creation, LLM APIs & Model Platforms, Enterprise Automation
Latest confirmed model	—	—	—	—	—
Main capabilities	Cited answers Pro Search (Depends on plan) Research (Deep Research) (Depends on plan) Model Council (Depends on plan) Brain (Preview)	Grammar and spelling correction Tone view (Depends on plan) Full-sentence rewrites (Depends on plan) AI prompts (Depends on plan) Plagiarism and AI-text detection (Depends on plan) Enterprise security (Depends on plan)	Notion Agent (Depends on plan) AI Meeting Notes (Depends on plan) Enterprise Search (Preview) Custom Agents (Depends on plan) Notion AI trial (Limited) Public API and webhooks	Paraphraser (Depends on plan) Summarizer (Depends on plan) AI Detector (Depends on plan) Grammar checker Team plans	Text and document translation (Depends on plan) Glossaries (Depends on plan) DeepL Write Pro (Depends on plan) DeepL Voice (Depends on plan) Translation memory (Depends on plan) API
Inputs / outputs	Not documented	Not documented	Not documented	Not documented	Not documented
Context window	Not documented	Not documented	Not documented	Not documented	Not documented
Free plan	Yes 3 Pro Searches/day; 1 Research query/month; limited uploads	Yes 100 AI prompts per month	Yes 5 MB per upload, 7-day page history, 10 guests	Yes Paraphraser 125 words per input; Summarizer 1,200 words; AI Detector 1,200 words per scan, 6 scans/day	Yes 50,000 characters per user/month; 1 file translation/month (5 MB max); 1 glossary (5 entries per language pair)
Cheapest paid plan	Education Pro: $10/mo With SheerID student verification	Pro: $30/mo $12/mo billed annually Per member. $30 monthly, $60 quarterly, $144 annually (shown as $12/month).	Plus: $12/mo $10/mo billed annually Per member	Premium: $19.95/mo $8.33/mo billed annually Annual $99.95 billed yearly; monthly figure from QuillBot FAQ; regional pricing applies	No monthly list price
All plans	Free — Free Pro — $20/mo $17/mo billed annually $200/year Education Pro — $10/mo With SheerID student verification Max — $200/mo $167/mo billed annually $2,000/year; annual billing on web only Enterprise Pro — $40/mo $33.33/mo billed annually Per seat; $400/seat/year; $30 or $300 for eligible education/nonprofit Enterprise Max — Price not listed on pages checked	Free — Free Pro — $30/mo $12/mo billed annually Per member. $30 monthly, $60 quarterly, $144 annually (shown as $12/month). Enterprise — Contact provider	Free — Free Plus — $12/mo $10/mo billed annually Per member Business — $24/mo $20/mo billed annually Per member Enterprise — Contact provider	Free — Free Premium — $19.95/mo $8.33/mo billed annually Annual $99.95 billed yearly; monthly figure from QuillBot FAQ; regional pricing applies Team — Per seat for 2-10 seats ($89.95 per seat billed every 12 months); larger teams pay less per seat	Free — Free Individual — Billed annually; monthly price not shown Team — Per user, billed annually Business — Per user, billed annually Enterprise — Contact provider
API access	Yes · docs (opens in a new tab)	Limited	Yes · docs (opens in a new tab)	No	Yes · docs (opens in a new tab)
Free API quota	None documented	None documented	None documented	None documented	Developer plan: 1,000,000 characters total, one-time (does not reset)
API pricing	sonar input/output: $1 per 1M tokens (input and output each) sonar-pro input: $3 per 1M input tokens sonar-pro output: $15 per 1M output tokens sonar request fee (low context): $5 per 1,000 requests	—	Notion credits (Custom Agents): $10 per 1,000 credits per month	—	Fixed monthly or yearly price with included characters, plus usage-based overage
Open-weight / proprietary	Proprietary	Proprietary	Proprietary	Proprietary	Proprietary
Commercial use	See plan terms	See plan terms	See plan terms	See plan terms	See plan terms
Privacy & data	Enterprise plans state data is never used for training; Enterprise Max adds configurable data retention.	Enterprise adds BYOK encryption, data loss prevention and confidential mode; check Grammarly's trust pages for retention terms.	30-day retention with LLM providers on non-Enterprise plans; zero retention on Enterprise	—	Growth: texts deleted immediately after translation
Platforms & integrations	Web, iOS, Android, Comet browser	Web, Browser extension, Windows, macOS, Microsoft Word, Google Docs	Web, Windows, macOS, iOS, Android	Web, Browser extension, Microsoft Word, Google Docs	Web, Windows, macOS, iOS, Android, Browser extension, Microsoft Word, Google Workspace, API
Learning curve	Beginner-friendly	Beginner-friendly	Beginner-friendly	Beginner-friendly	Beginner-friendly
Advantages	Strong focus on citations Multi-provider model access Published enterprise limits	Works across many apps without copy-pasting Low learning curve Generous free tier for basic correction	AI grounded in your own workspace content Broad feature set in one tool Free Plus for students and educators	Generous free tier Low-cost annual plan Simple interface	Translation quality and formatting retention Clear data-security commitments on paid plans Mature developer SDKs
Limitations	Free plan has tight Pro Search and Research limits Pro limits described as 'average use' rather than numbers API billed separately from subscriptions	Free plan limited to 100 AI prompts per month Advanced rewriting and plagiarism checks need Pro No public general-purpose writing API (only an audit logs API for Enterprise)	Full AI features (Agent, Meeting Notes, Enterprise Search) require Business or Enterprise Custom Agents cost extra credits Zero data retention with LLM providers only on Enterprise	Free paraphraser limited to 125 words and two modes Prices vary by region AI detection results are probabilistic	Free Translator limited to 50,000 characters and 1 file per month API Developer allowance does not reset Growth API pricing was not visible on the official page fetched
Last verified	Oct 19, 2026	Oct 19, 2026	Oct 19, 2026	Oct 19, 2026	Oct 19, 2026

How to choose

Start from the rows that matter for your job: a free plan and learning curve for casual use; API access, rates and data terms for building products; context window and modalities for long documents or images. Provider claims are labelled as such; we do not rank.

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