Grammarly, Jasper, or Copy.ai: pick by what the tool knows before it writes
Three AI writing tools that no longer sell writing: what Grammarly (now Superhuman), Jasper and Copy.ai load before they write, what each tier really costs, and which one your drafts need.
Type a topic into any of the three tools below and you get a usable first draft. That stopped being the interesting part years ago.
What changed is what each one is selling. Grammarly renamed its whole company Superhuman in October 2025 and folded the writing checker into a suite of apps 1.
Jasper now sells a way to be quoted by ChatGPT. Copy.ai was bought by a revenue-operations company and sells go-to-market workflows 2.
The independent rankings agree the category moved. Zapier's September 2026 update says most dedicated writing apps "went from the cutting edge to irrelevant" and had to pivot 3.
Its tester also found "very few meaningful quality differences" between the survivors 3.
So the question is no longer which tool writes better prose. It is what the tool knows before it starts writing. Your sentence, your brand, or your company's data — pick the one your drafts are missing.
Quick pick
Grammarly, bought through Superhuman — for one person whose own sentences need a second reader. US$12 a month, with a documents app thrown in 4.
Jasper — for a marketing team that has to sound like one company and be able to prove it. From US$59 a seat a month 5.
Copy.ai — for a sales and marketing engine that writes per account out of CRM data. The cheapest plan already covers five people 6.
Comparison at a glance
Prices were read from the vendors' own plan pages on 20 October 2026.
| Field | Grammarly (Superhuman) | Jasper | Copy.ai |
|---|---|---|---|
| What you are buying | A correction and rewriting layer that follows you into whatever you type in, attached to a suite 7 | A marketing content platform built on brand and product context 5 | A go-to-market platform that emits copy as one output among several 8 |
| What it reads before it writes | The text in front of you; on a paid plan, connected apps such as Slack, Gmail and Outlook 4 | Your Brand Voice, uploaded knowledge, defined audiences and style rules 5 | Company data in tables and an Infobase, plus records pulled from CRM systems 8 |
| Entry paid price, as published | Pro at US$12 a member a month billed annually, US$15 billed monthly 4 | Pro at US$59 a seat a month billed yearly, US$69 billed monthly 5 | Chat at US$29 a month, or US$24 a month billed as US$288 a year, for five seats 6 |
| What that tier includes | 2,000 AI prompts a member a month, one style guide, one brand tone, and Superhuman Docs 7 | One seat, two Brand Voices, five knowledge assets, three audiences, seven-day trial 5 | Five seats, unlimited words in chat, and models from OpenAI, Anthropic and Gemini 6 |
| What moved most recently | Go 1.0 on 12 August 2026; Fathom acquired 14 September 2026 910 | A GEO Agent that launched on 16 June 2026 11 | Joined Fullcast on 15 October 2025 2 |
| The limit that interrupts work | App connections and custom agents need a paid plan, and agent use is soft-capped 9 | API access, the Grid and unlimited brand context all start on Business 5 | Workflow credits start on the US$1,000-a-month plan; the cheap tier is chat only 6 |
| Independent signal | PCMag's 4.0: superb at errors, weaker at voice 12 | Zapier's pick for businesses, with price as the complaint 3 | Not on Zapier's 2026 list of six at all 3 |
Grammarly: the proofreader that became the front door
You are buying the layer that underlines things as you type, in your browser, your documents and your mail, and can now rewrite a sentence or a whole paragraph on request 7.
The price you will find first is US$12 a member a month. That is the annual rate, and monthly billing is US$15 4.
Pro buys 2,000 AI prompts a member a month, full-sentence rewrites, tone adjustment, and both plagiarism and AI-text detection. One style guide and one brand tone come with it. Enterprise lifts the prompt cap entirely 7.
What the money also buys now is the suite. The same US$12 includes Superhuman Docs, the documents app formerly called Coda, and the Go assistant's chat 4.
Business, at US$33 a member a month billed annually, adds Superhuman Mail and connections to Jira, Linear, Asana, Confluence and Zendesk 4.
Then there is the agent layer, which is where the writing tool is heading. Go 1.0, shipped on 12 August 2026, lets users build custom agents triggered by a schedule, an event, or simply by starting to type 9.
Two of the pre-built ones check your claims against company data and flag prose that sounds machine-made 9.
Fathom, bought on 14 September 2026, adds meeting recordings as another source of context 10.
The limit that bites is not the prompt count. Connecting work apps and building custom agents requires a paid plan, and Superhuman launched those agents with soft usage limits while it works out usage-based pricing 9.
PCMag's reviewer, who tested the paid tier, scored it 4.0 and called it superb at catching spelling and punctuation 12.
The same review says its style suggestions can take the character out of your writing, and that its generated prose "sometimes sounds robotic" 12.
Read that as a boundary, not a flaw. This tool is excellent at the sentence you already wrote, and ordinary at inventing the one you did not.
Jasper: buy the brand file
Jasper sells the context that makes copy sound like your company: a Brand Voice built from your own writing, an uploaded knowledge base, defined audiences, and a style guide the editor enforces 5.
Pro is US$59 a seat a month billed yearly, or US$69 monthly, and it covers exactly one seat. That seat gets two Brand Voices, five knowledge assets and three audiences, and the seven-day trial runs on this plan 5.
Business is quoted per company. It lifts the brand-context caps, adds API access, the Grid for scaled execution, custom agents and admin governance — the parts a marketing department needs and a freelancer does not 5.
What moved most recently is where the output is aimed. Jasper launched an end-to-end GEO Agent on 16 June 2026 11.
GEO, or generative engine optimization, is the practice of getting a brand described and cited inside AI answers rather than ranked in a list of links. The agent tracks citation rates and sentiment across ChatGPT, Gemini and Claude, then pushes fixes back into content 11.
For a content team, that is the strongest reason to pay Jasper rather than a chatbot. The brand file is the product; the writing is downstream of it.
Zapier made Jasper its 2026 pick for businesses and called it one of the most mature and feature-filled options, with Brand Voice output noticeably closer to the tester's own writing than a generic tone instruction managed 3.
Its complaint is the one to weigh: expensive, given that nearly every tool in the category runs on similar language models 3. Five writers on Pro is five seats, at US$295 a month on the annual rate.
Copy.ai: buy the process
Copy.ai stopped selling a writing desk and started selling a pipeline. The platform now consists of workflows that encode a repeatable process, agents, tables holding your data, an Infobase for company facts, and a chat interface on top 8.
The cheapest thing you can buy is Chat: US$29 a month, or US$24 a month if you pay US$288 for a year. It covers five seats, unlimited words, and access to OpenAI, Anthropic and Gemini models 6.
Everything Copy.ai is actually known for sits above that. Growth is US$1,000 a month, billed as US$12,000 a year, and brings 75 seats and 20,000 workflow credits a month. The Chat plan below it carries no workflow credits at all 6.
The company itself changed hands. Fullcast, which builds revenue-operations software, acquired Copy.ai on 15 October 2025 2.
The pitch since then has been one system running from territory planning to the outreach copy that follows it 2.
That is a genuinely different product from the other two, and the independent ranking reflects it: Copy.ai does not appear among Zapier's six picks for 2026 3.
Buy it when copy is an output of a sales process — a hundred account-specific emails generated from clean CRM fields — and not when you want help with a blog post you are writing yourself.
Pick by the job
- You write your own drafts and want a second reader. Grammarly at US$12 a member a month on the annual rate, which now includes Superhuman Docs 4.
- Several marketers write for one brand and claims must be approved. Jasper Pro at US$59 a seat a month yearly, or Business once you need the API, the Grid and unlimited brand context 5.
- Copy is produced per account, per territory, per segment, from CRM data. Copy.ai, and only if that data is already trustworthy, since the workflows run on it 8.
- You have no team and no brand file, and the draft is the whole problem. None of the three. Use the assistant you already pay for.
If all you want is a better first draft
AI writing is increasingly a feature of software you own rather than a product you buy. Zapier's tester points readers to the general chatbots as a serious option alongside the specialists 3.
So run the cheap test first. Give ChatGPT, Claude or Gemini the brief, then give the same brief to Grammarly's free tier, which allows 100 AI prompts a month 7.
If the chatbot's draft needs the same amount of rewriting as before, the missing ingredient is context, and that is what the other two sell. If the draft is close and the sentences are just clumsy, US$12 fixes it.
Traps that waste the money
- Mistaking the annual rate for the monthly one. Grammarly is US$12 on annual billing and US$15 monthly; Jasper is US$59 and US$69 45.
- Buying five seats to get one. Copy.ai's entry plan covers five people, which is fine for a team and wasteful for a solo writer 6.
- Discovering the useful feature is one tier up. App connectors and custom agents need a paid Grammarly plan, Jira and Zendesk connections need Business, and Jasper's API sits behind Business 59.
- Assuming two Brand Voices covers a group. Jasper Pro allows two voices and five knowledge assets, which runs out quickly in a company with several products 5.
- Forgetting agent limits exist. Superhuman's agents launched with soft usage caps and usage-based pricing still to come 9.
- Paying for a go-to-market platform to write blog posts. Copy.ai's workflow layer starts at US$1,000 a month 6.
- Letting the free tier decide without a deadline. Grammarly's free plan stops at 100 prompts a month and Jasper's trial runs seven days 57.
Test it in one afternoon
- Take one real piece of writing you sent last week, unchanged.
- Send the same brief to two candidates — one specialist, plus the assistant you already use.
- Count the words you kept against the words you rewrote. That ratio is the only quality score that matters.
- List what the tool got wrong because it lacked context: a claim, a price, a product name. That list tells you which context is worth buying.
- Put the output where it has to live — a document, a Google Docs integration, a CRM field — and see how much manual moving it needs.
- Price your final choice at your real seat count and billing cycle before you subscribe.
Bottom line
Grammarly, through Superhuman, if the sentences are yours and the problem is polish. Jasper if the brand is the hard part and several people write against it. Copy.ai if the volume is the problem and the company data already exists. If you just need a better first draft, the assistant you already pay for is the cheaper answer.
Prices were read from the vendors' pages on 20 October 2026.
References
- 1Grammarly rebrands the company as Superhuman
grammarly.com
- 2Fullcast acquires Copy.ai
copy.ai
- 3The 6 best AI writing generators in 2026
zapier.com
- 4Superhuman Go pricing and plans
superhuman.com
- 5Jasper plans and pricing
jasper.ai
- 6Copy.ai pricing
copy.ai
- 7Grammarly prices and plans
grammarly.com
- 8Copy.ai platform
copy.ai
- 9Go 1.0
blog.superhuman.com
- 10Superhuman acquires Fathom
blog.superhuman.com
- 11Jasper launches an end-to-end GEO Agent
prnewswire.com
- 12Grammarly review
pcmag.com
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