Grammarly is easiest to evaluate on writing you actually send: emails, reports, proposals, and documents where a small change can affect meaning. The right question is whether its suggestions improve that work after you review them.
Our recommendation: try the free experience on several ordinary drafts. Consider a paid plan only when you repeatedly need a specific additional feature, and check whether the revised text still sounds like you.
Editorial correction, September 6, 2026: the earlier version claimed thorough testing without publishing supporting evidence. That claim and its star rating have been removed. This is a researched buying guide.
Premium or Pro?
The old title used Grammarly Premium. Grammarly's current public plans are Free, Pro, and Enterprise. Its plan page explains that Pro includes advanced writing features associated with Premium, including tone suggestions and sentence rewrites. Check the current plan comparison for availability and the billing terms offered to you.
Do not confuse an advertised monthly equivalent with a month-to-month charge. Read the billing period, total payment, renewal terms, and cancellation conditions before starting a paid plan or trial.
What to test first
Choose three pieces of writing: a short email, an explanation of a technical point, and a longer document with your own voice. Save the originals. Review suggestions one at a time and note why you accept or reject them.
The important result is not the number of suggestions. A useful change removes confusion, corrects an error, or makes the sentence easier for its intended reader. An unnecessary change can flatten your voice or alter a careful qualification.
Correction and rewriting are different jobs
Correcting a misspelling usually has a clear answer. Rewriting a sentence introduces judgment about emphasis, tone, and audience. A suggestion that sounds smoother may also sound less direct or imply more certainty than you intended.
For example, “the test suggests a possible improvement” does not mean “the test proves an improvement.” When reviewing generated text, watch the strength of verbs as closely as grammar.
When paying could make sense
A paid writing tool may be useful when you edit often, the additional features address recurring problems, and reviewing the suggestions takes less time than your existing process. It is harder to justify when you rarely write or already get the same benefit from tools you use.
Make the comparison on completed work. Measure how long it takes to produce a draft you are comfortable sending, including the time spent rejecting suggestions and checking meaning.
Keep responsibility for the document
Verify names, numbers, quotations, and factual claims yourself. A polished sentence can still contain a wrong fact. Also check that confidential work is permitted in the service under your employer's policies and the account's current data terms.
A writing tool can suggest changes; it cannot decide the obligations of your workplace or the intent of a difficult message for you.
A useful decision rule
Keep the tool if it reliably improves your writing with an acceptable review effort. Stay with the free plan if it does enough. Upgrade only for a feature you have identified, at terms you have checked.
If you are still learning how AI fits your work, start with our beginner guide. One repeatable improvement is more useful than another unused subscription.
Found something that needs correcting? Tell the editor. Research, estimates, and hands-on measurements should be identified in the article. Read our affiliate disclosure.