Grammarly fixed your grammar.
Did your writing actually get better?
You submitted. You got the grade. And next week you made the same mistakes again. Fixing sentences is not the same as becoming a better writer.
No credit card needed. Free while we're in beta.
The difference
Fix my sentences
Your essay comes back cleaner. You feel good. Three weeks later, the same habits show up in your next paper. You never had to understand what went wrong.
Fix my writing
Onsen reads your writing, finds the patterns that keep coming back, and teaches you to address them yourself — so the next piece is actually better.
How it works
Three things, in order.
- 1
Submit a piece of your writing
An essay, an email, a lab report — anything you wrote in English. Paste it in or upload a file.
- 2
Onsen identifies your patterns
Not every grammar mistake — the recurring habits specific to your writing. The ones that follow you from paper to paper. We track them across every submission so you can see whether they're improving over time.
- 3
You do the work — with a guide
Targeted exercises on your actual sentences. A vocabulary list built from your writing context. Short lessons that explain the why, not just the what. Onsen does not rewrite your sentences for you — because that would miss the point.
What Onsen catches
Not every mistake. The right ones.
Onsen focuses on patterns that follow writers across pieces — the habits rooted in how your first language structures thought. A few common ones:
Article misuse
The, a, an — languages without articles make this a persistent blind spot.
Passive voice overuse
Some L1s favour impersonal constructions that read as evasive in English.
Tense inconsistency
Shifting between past and present within the same argument.
Nominalization overuse
Turning verbs into nouns ('the implementation of' instead of 'implementing').
Weak topic sentences
Opening paragraphs that bury the point instead of leading with it.
Run-on sentences
Long coordinate chains that work in some languages but exhaust English readers.
Onsen tracks 24 pattern types in total, weighted by your native language.
Everything included
More than a report.
Pattern reports
Every submission produces a ranked list of your recurring habits — with examples pulled verbatim from your own writing.
Targeted exercises
Practice rewriting your actual sentences, not generic drills. Feedback is immediate and specific to what you wrote.
Vocabulary cards
Collocations, phrases, and verb–preposition pairs drawn from your writing context — the words you almost used correctly.
Spaced repetition
Vocabulary is scheduled for review using the SM-2 algorithm, the same system behind Anki. Cards surface exactly when you're about to forget them.
Anki & Mochi export
Export your entire vocab deck to Anki (.apkg) or Mochi (.mochi) and study alongside your existing cards.
Progress tracking
Onsen tracks every pattern across every submission. You can see which habits are improving, which are stable, and which need more focus.
What we believe
Technology is removing the obstacles. What remains is the part that was always yours.
For decades, the barriers to being heard were practical: access to education, to networks, to the right room. Those barriers are collapsing. The tools are becoming equal. Which means what distinguishes individuals now is not access — it is opinion. Not fluency alone, but the ability to think clearly, argue precisely, and say something that actually needs to be said.
International students occupy a position the world is only beginning to take seriously. Their perspectives were formed outside the dominant frame. Their arguments were built at the intersection of cultures, economies, and languages that most writers never touch. The global market does not need more of the same voice. It needs theirs. But those ideas only reach their full force when the writer can carry them with precision and conviction — when the language does not get in the way of the thought.
This generation moves fast and is loud. Holding a position is harder than it has ever been. The ability to form a critical argument — one that is yours, that you can defend, that survives pressure and does not collapse under noise — is not a soft skill. It is how an individual remains a distinct voice in a world where everything competes for attention at once.
Onsen believes every student should be able to do that. Not just write correctly, but write with a point of view strong enough to stand on its own.
That is why we do not correct your sentences. A corrected essay teaches you nothing. We find the patterns that are holding your ideas back — and we make you do the work of fixing them. Because the writer who understands their own habits is the one who keeps improving long after any tool stops helping.
We help people attempt thoughts that are slightly too large for them, then grow into the mouth required to say them.
— Studio Prajna
Who it's for
Onsen is designed for writers who grew up in more than one language — students who think in one language and write in another, who have learned English well enough to get by but want to close the gap between their ideas and how those ideas land on the page.
Your grammar checker does not know that. Onsen does.
FAQ
Questions.
How is this different from ChatGPT?
ChatGPT will rewrite your essay if you ask it to. Onsen won't. The goal is not a better essay — it's a better writer. Onsen identifies the specific habits in your writing, explains why they form, and makes you do the work of correcting them. That friction is the point.
How is this different from Grammarly?
Grammarly catches errors in the moment and fixes them for you. Onsen looks across multiple submissions to find the patterns that keep coming back — the habits Grammarly quietly corrects every time without you ever having to understand them.
Do I need to submit multiple pieces for it to work?
No — you get a full pattern report and exercises from your first submission. But Onsen becomes more useful over time. The more you submit, the better it can distinguish your persistent habits from one-off mistakes, and the clearer your improvement becomes.
Is my writing stored? Who can see it?
Your submissions are stored to your account so Onsen can track patterns across pieces. Only you can see your writing. You can delete your account and all associated data at any time from Settings.
What languages does Onsen support?
Onsen coaches in English. It is designed for writers whose first language is not English — it currently recognises over 30 native languages and adjusts its pattern weighting based on the interference patterns common to each.
Ready to start?
Free to use. No credit card.
Onsen by Studio Prajna