Grammatikai was born in 2023 out of frustration: online grammar checkers were either too limited, too expensive, or too generic to be truly useful. A developer passionate about languages wanted something different: a tool that corrects, rephrases and translates without ever rewriting your style in your place.
CHAPTER 1 · THE IDEA A checker that respects your style
The promise is simple: text in, text out, corrected, or rephrased in the tone you choose, or translated while keeping its idioms. No urge to suggest the word “impactful”. No urge to turn your casual writing into formal prose without warning. The tool stays in its lane.
That’s also why Grammatikai does not generate content from a brief. If you want an agent that invents content, this isn’t the right place. If you already write and want to polish: welcome.
CHAPTER 2 · THE PROJECT Independent, and that’s its strength
Grammatikai isn’t a startup funded by millions, nor the product of a marketing committee. It’s a solo project, built by a single developer. That independence, far from being a weakness, lets us move fast, stay close to users, and never lose sight of what matters.
No technical jargon, no empty promises. Every feature was designed to meet a real need: write better, faster, in the language of your choice.
CHAPTER 3 · THE PRODUCT Three functions, one interface
Most online checkers stop at grammar. Grammatikai goes further: grammar correction (spelling, grammar, conjugation, punctuation, typography), rephrasing with 28 tones and 3 intensities, and idiomatic translation, all in the same interface, without switching tools.
The multilingual coverage spans 40 languages, from English to Thai, including Japanese, Arabic, Korean and Swedish. Each language is handled according to its own grammar, typography and politeness conventions.
Your words deserve to be well placed. The tool helps you place them better, without replacing them.
CHAPTER 4 · PRIVACY Your texts don’t feed our models
Everything you write is used to send you a response. That’s it. No text stored. No training on your content. Each request is processed in memory, then erased immediately after the response.
On the infrastructure side: no database collection stores your texts, only anonymized metadata (source language, target language, length, timestamp). That’s what the official privacy policy says, and it’s verifiable in the code.
CHAPTER 5 · ACCESSIBILITY Demo without signup
You can test the tool without creating an account, right from the homepage. The demo accepts 1,500 characters per run, enough to form a real opinion. If you stay, the free plan gives you 15 corrections and 8 rephrasings per 24 hours, still without a credit card.
For regular use, paid plans start at €3.29 per month. All include a 14-day free trial, no commitment, cancelable in one click.