Comparison
ProseMap vs Grammarly: you stay the writer
Grammarly fixes sentences. ProseMap shows you where your draft is strong, where it is weak, and why. Then it helps you fix only the weak parts, in your own voice. The ideas and the words stay yours.
At a glance
| ProseMap | Grammarly | |
|---|---|---|
| Seeing what works and what does not | ||
| A score for every sentence: does it do its job? | ✓ Yes | – No |
| A score for every join between two sentences | ✓ Yes | – No |
| A map of the whole draft, so weak parts stand out at a glance | ✓ Yes | – No |
| Finds sentences that read well but say nothing | ✓ Yes | – No |
| A plain-English reason for any score you ask about | ✓ Yes | PartlyShort reasons for each suggestion |
| Keeping your voice | ||
| Leaves your short, sharp or broken sentences alone when they work | ✓ Yes | PartlyOften marks them as errors |
| You can disagree, and the scores follow your view | ✓ Yes | – NoYou can dismiss a suggestion |
| Your own notes, typed or spoken, steer the AI revision | ✓ Yes | – No |
| AI revision changes only the weak spots; the rest stays word for word | ✓ Yes | PartlyRewrites the text you select |
| Scores the new version and compares it with the old one | ✓ Yes | – No |
| Paying | ||
| Pay only for what you run; no subscription needed | ✓ Yes | – NoFree plan, then a subscription |
| Where Grammarly is the better tool | ||
| Fixes grammar, spelling and punctuation | – No | ✓ Yes |
| Works as you type, in the apps you already use | – No | ✓ Yes |
| Has a free plan | – No | ✓ Yes |
Grammarly is described in general terms as of 3 October 2026. Its features change; check its own site. ProseMap is not affiliated with Grammarly.
The AI assists. You write.
Many AI writing tools give you a new text and ask you to accept it. After a few rounds, the writing sounds like the tool and not like you.
ProseMap works the other way round. First it reads your draft and shows you a map: which sentences work, which do not, and where one sentence does not lead to the next. You decide what matters. You can leave notes, by typing or by speaking, and you can tell it when it is wrong.
Only then, if you want, you press Improve draft. ProseMap changes the weak spots and nothing else. Every other sentence stays word for word. It scores the new version and puts the two side by side, so you can see what changed and keep the one you like.
You do the writing and the thinking. The AI helps you deliver it.
What Grammarly does
Grammarly checks writing as you type, across the apps you write in. It corrects grammar, spelling and punctuation, suggests clearer or more concise phrasing, and comments on tone. Its suggestions are local: this word, this sentence, this comma.
What ProseMap does
ProseMap reads a whole draft and scores every sentence from 0 to 100 on how well it works where it stands, scores every join between sentences as a handoff, and adds one judgment of the document's arc. It shows this as a map in which weak stretches are visible at a glance, ranks the places where a revision would pay off most, and explains any judgment on request. It does not correct grammar or spelling. How the scoring works.
In more detail
| Grammarly | ProseMap | |
|---|---|---|
| Main job | Correctness and clarity of each sentence, as you type | Whether each sentence does its job, and whether the sentences hold together |
| Unit of attention | A word, phrase or sentence | A sentence in its paragraph, the join between two sentences, and the whole arc |
| A fluent sentence that says nothing | Passes; it is correct | Scores low and is flagged as generic fluency or low information |
| A deliberate fragment | Usually flagged for correction | Can score high and be marked as a controlled fracture |
| Flow between sentences | Not assessed as such | Every handoff scored and typed: advance, deepen, restate, drift and others |
| Output | Inline suggestions you accept or dismiss | A map of the document, ranked hotspots, explanations on request |
| Rewrites your text | Yes, suggestion by suggestion | Only when you ask. Improve draft changes the weak spots and leaves the rest word for word |
| Where it runs | Wherever you type, through extensions and integrations | In its own web app, and from AI assistants through a connector |
This comparison describes Grammarly in general terms as of 3 October 2026. Its features change; check its own site for current details. ProseMap is not affiliated with Grammarly.
Which to use
Use Grammarly to get the sentences right. Use ProseMap to find out which sentences, however right, are not earning their place, and where the piece stops moving. Many writers will want both, at different stages: ProseMap on a draft that is structurally unsettled, a grammar checker on the final pass.
What ProseMap will not do
- It will not fix your grammar, spelling or punctuation.
- It does not work inside your word processor or browser as you type.
- It does not claim its scores are objective. ProseMap's scores and explanations are produced by AI models. They can be wrong, incomplete or misleading, and they are one reader's judgment rather than an objective measure of writing quality. Check anything that matters independently.