Grammarly vs ChatGPT for client writing
These two tools do different jobs and most people only need one of them. Which one depends on whether your problem is producing the draft or trusting it before you send.
This comparison gets asked because both tools touch writing, but they solve opposite halves of the problem. One produces text; the other checks text you already produced.
Framing it as a contest leads people to buy both when most need one. The useful question is where your time actually goes.
If writing the first draft is the slow part, you want an assistant — ChatGPT or Claude, not Grammarly. If the draft comes easily but you re-read client emails five times before sending, Grammarly solves that and an assistant does not. Buying both is only justified once you are publishing regularly.
The two tools compared
Grammarly
Works everywhere you already type
EUR 12/mo · Pro
ChatGPT
Strong free plan
EUR 23/mo · Plus
Different jobs, not competing products
ChatGPT generates: it drafts, restructures, summarises and answers. Grammarly corrects: it catches the mistakes in text you wrote yourself, inside whatever application you were already typing in. An assistant will not flag the typo in the email you just composed in Gmail, because it never saw it.
Where Grammarly is the better buy
Grammarly earns its place when the friction is confidence rather than blank-page speed — which is common for non-native English speakers writing to clients, and for anyone whose work is judged on proposals and emails. It runs everywhere you type, which is the whole point: correction has to happen where the writing happens.
Where the assistant is the better buy
If you spend an hour on a first draft that a prompt gets to eighty percent in two minutes, an assistant saves far more time than a proofreader can. It also handles research, restructuring and summarising, which Grammarly does not attempt.
The overlap that makes people overspend
Both offer rewriting. An assistant will happily tighten a paragraph, and Grammarly's rewrite suggestions overlap with that. The difference is that Grammarly's rewrites tend to flatten a distinctive voice toward a neutral register — useful for a contract clause, actively unhelpful for writing meant to sound like you.
A note on the free tiers
Both have permanent free plans, and both free plans are usable. Grammarly's free tier covers spelling and grammar, which is the part most people actually need; the paid tier adds tone and rewriting. Run both free for a fortnight on real client work before paying for either — that costs nothing and answers the question better than any comparison can.
Pricing side by side
| Tool | Starting price | Billing condition | Free access |
|---|---|---|---|
| Grammarly | EUR 12/mo · Pro | monthly billing; 7-day free trial | Yes |
| ChatGPT | EUR 23/mo · Plus | monthly billing | Yes |
Verified from official vendor pricing pages on 2026-08-06. Currencies are shown as each vendor quoted them.
Frequently asked questions
Do I need both?
Rarely, below a regular publishing cadence. Start with whichever addresses your actual bottleneck. Add the second only when you can name a task the first one handles badly.
Can ChatGPT replace Grammarly?
Not in practice, because of where each one lives. An assistant corrects text you paste into it; Grammarly corrects text where you are already typing. The workflow difference matters more than the capability overlap.
Is Grammarly worth it for non-native English writers?
This is its strongest case. Catching errors in a language you did not grow up in, inside the email client you are already writing in, is exactly the job it was built for — and the free tier covers most of it.
What about privacy with client material?
Both process your text on their servers. If you handle confidential client documents, check each vendor's business-tier terms, which frequently differ from the consumer defaults on training-data use.
Related reading
ChatGPT vs Claude
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