Grammarly vs Jasper vs Copy.ai vs Notion AI
Four AI writing tools aimed at four different writers — which is aimed at you?
Users rate Notion AI highest of the 2 we can score
Notion AI sits at 4.78★ from 90k reviews (#6 of 14 tools we can rank), against Grammarly at 4.66★ from 221k reviews (#11). That is a verdict on the app people use, not on the work it produces — we have not tested either on a task suite.
Ranked on app-store ratings, weighted by review count — the same ranking every tool page on this site uses
These four are not straight substitutes. Grammarly checks and improves writing as you type, wherever you write. Jasper is built for marketing teams running campaigns. Copy.ai automates repetitive marketing, sales and operations work. Notion AI searches across your team's apps and automates daily tasks. Pick on which of those sentences describes your day.
What each one looks like
Side by side
Every cell is either a fact with the source and the date we read it, or a sentence saying we hold no verified answer. There is no third option: nothing here is filled in from memory, and a row only appears when at least one of these tools has something real in it.
Swipe the table sideways for the other columns.
| Measure | Grammarly | Jasper | Copy.ai | Notion AI |
|---|---|---|---|---|
| What users rate itApp-store ratings, ranked by rating weighted by review count — so a 4.88 from three million reviews outranks a 4.9 from four thousand. | 4.66★221k reviews on App Store · #11 of 14 we can rankApple App Store (iTunes Lookup API) · 17 Aug 2026 | No app-store listing we can score | No app-store listing we can score | 4.78★90k reviews on App Store · #6 of 14 we can rankApple App Store (iTunes Lookup API) · 17 Aug 2026 |
| What people are sayingFrom our own 90-day sweep of Reddit, X, YouTube, Hacker News and the web. The count always travels with the word. | Too few opinions to call — 0 of 78 posts took a side | Too few opinions to call — 2 of 72 posts took a side | Too few opinions to call — 1 of 97 posts took a side | Mixed4 positive, 4 negative of 8 that took a side (199 scanned) |
| Free versionConfirmed on the vendor's own pricing page, with the date we read it. | Not confirmed on their pricing page — check ↗ | Not confirmed on their pricing page — check ↗ | Not confirmed on their pricing page — check ↗ | Yesconfirmed 17 Aug 2026notion.com/pricing · 17 Aug 2026 |
| Trains on what you typeThe vendor's own published answer. No line renders unless we found the sentence word-for-word in a document we fetched. | They use your content and interactions by default to improve their services and train their suggestion engine.grammarly.com ↗ | They use your data to train their AI models by default, but users in the EU and UK can opt out.jasper.ai ↗ | We could not verify it either way | We could not verify it either way |
| How long they keep it | They keep your data for as long as they need it for business and legal purposes, with no specific end date.grammarly.com ↗ | They keep your data for as long as they deem necessary for their purposes.jasper.ai ↗ | They keep your data for as long as they decide it is necessary for their business purposes.copy.ai ↗ | They keep your information for as long as you use their services or as long as they need it for business and legal reasons.notion.com ↗ |
| They warn it can be wrong | The company explicitly warns users not to rely on their AI as a single source of factual information.grammarly.com ↗ | No warning we could find in their own docs | No warning we could find in their own docs | No warning we could find in their own docs |
| Last app update we sawThe date on the vendor's own app-store listing when we last read it — a rough read on whether the product is still moving. | 13 Aug 2026Apple App Store (iTunes Lookup API) · 17 Aug 2026 | No app-store listing to read | No app-store listing to read | 11 Aug 2026Apple App Store (iTunes Lookup API) · 17 Aug 2026 |
Each one on its own
It checks and improves your writing as you type — grammar, clarity and tone — wherever you write.
In their words: “Work with an AI partner that helps turn your thoughts into writing that's clear, credible, and impossible to ignore.” — grammarly.com ↗ · read 10 Aug 2026
People use it to create marketing content, run campaigns, and optimize search engine performance.
In their words: “Put AI agents to work for marketing” — jasper.ai ↗ · read 9 Aug 2026
“Jasper AI Review 2026: Good Tool, Narrowing Use Case”
a quiet post from our 90-day sweep — read it ↗
Automate repetitive marketing, sales, and operations tasks using a single platform.
In their words: “Introducing the first-ever GTM AI platform.” — copy.ai ↗ · read 9 Aug 2026
“Copy.ai Problems & Issues 2026 - AI Writing Tool Exposed”
a quiet post from our 90-day sweep — read it ↗
Teams use it to search across apps, get answers, and automate daily tasks.
In their words: “Capture context, find answers, and automate tasks with AI built for your team.” — notion.com ↗ · read 9 Aug 2026
“Why I have finally had enough and will cancel after thousands of hours invested in notion”
a mixed post from our 90-day sweep — read it ↗
What we could not compare
- No tested score for Grammarly, Jasper, Copy.ai and Notion AI — we score a tool only when it names the model it runs.
- No verified price for Grammarly, Jasper, Copy.ai and Notion AI — their pricing pages render figures in a browser, so we hold none.
- We could not find a quotable sentence about training data for Copy.ai and Notion AI.
These gaps close by themselves: the scanner re-reads every vendor pricing page and app-store listing on a schedule, and this page rebuilds from whatever it found. How the testing works →
Questions people ask
Grammarly or Jasper or Copy.ai or Notion AI — which should I choose?
Users rate Notion AI highest of the 2 we can score. That is based on app-store ratings, weighted by review count — the same ranking every tool page on this site uses. Notion AI sits at 4.78★ from 90k reviews (#6 of 14 tools we can rank), against Grammarly at 4.66★ from 221k reviews (#11). That is a verdict on the app people use, not on the work it produces — we have not tested either on a task suite.
Which of Grammarly, Jasper, Copy.ai, Notion AI is cheapest?
We hold no verified price for any of them: each publishes its figures only to a browser, so we link to their pricing pages rather than quote a number we could not read.
Do Grammarly, Jasper, Copy.ai, Notion AI train on what you type?
Grammarly: They use your content and interactions by default to improve their services and train their suggestion engine. Jasper: They use your data to train their AI models by default, but users in the EU and UK can opt out. Each of those answers is quoted word-for-word from the vendor's own published document, linked on this page with the date we read it. For Copy.ai, Notion AI we could not find a sentence to quote, so we make no claim.
How do you test these?
We have not run a task suite on these. We score a tool only when it names the model it runs, because a coding assistant or notetaker is a wrapper around a model — so this page compares what we can verify instead: prices from vendor pricing pages, app-store ratings, our 90-day sweep of public opinion, and each company's own written data policy.
No vendor pays for placement, position or inclusion, and the code that produces the verdict above cannot see which outbound links earn us anything. How we make money →
More head-to-heads: ChatGPT vs Claude vs Gemini · Cursor vs GitHub Copilot vs Windsurf · Lovable vs Replit vs v0 · Otter.ai vs Fireflies.ai vs Fathom · Perplexity vs NotebookLM
Every tool head-to-head → · Every tool we track → · Methodology →