Speed meets accuracy.
AI-powered translation, proofreading, and learning — in one place.
Free sign-up — no credit card. Unlock proofreading, word explanations & more.
Try translation instantly without login
Three-column translation at a glance
View input, proofreading, and translation side by side.
Highlighted corrections and word explanations help you master accurate expression.
More than just translation
Translation, proofreading, and learning tools in one place.
Everything you need to communicate accurately.
Fast AI translation
Auto-detects the input language and translates seamlessly between your native and target languages. Results stream in real time via SSE.
Proofreading
Automatically proofreads text written in a non-native language. Corrections are highlighted inline with explanations for each fix.
Customizable tone tags
Translate and proofread in the right register — formal, casual, business email, and more. Fine-tune with follow-up prompts.
Word explanations & examples
See meanings, nuances, and usage tips for key words and phrases in your translation, complete with example sentences. Learn as you translate.
Translate from any app
in an instant
One shortcut key to instantly translate selected text. Works in your browser, email client, chat app — anywhere.
- ✓Global shortcut (Cmd + K / Ctrl + K) for instant launch
- ✓Selected text is automatically loaded into the input
- ✓macOS / Windows supported
Select text in any app,
⌘ + J press
Translation appears instantly.
5 major languages supported
Covers the key business languages.
Auto-detection means you just type and get the right translation.
More languages coming soon
Security you can trust
Designed with privacy first to protect the confidential information you handle at work.
Never used for AI training
Your input text and translations are never used as training data for AI models. Translate confidential documents with confidence.
History stays on your device
Translation history is stored only on your device and is never sent to a server. You always stay in control of your data.
What professionals say
How professionals put Nico to work every day.
I've used it for both Japanese-to-English and English-to-Japanese. It's a great service that lets you pick up keywords and word meanings while you translate. I get to learn the words and phrases I use most often and put them into practice in real conversations and at work, so I'm learning English very efficiently.
Translation in both directions is fast, smooth, and easy to use. I used to rely on AI tools like ChatGPT to write emails in English, but typing out prompts was a hassle. With this app, I just write what I want to say in Japanese and it instantly produces natural English — it makes everything so much easier. I'd recommend it to anyone who writes emails in English or switches between Japanese and English every day.
Nice work! Really cool app! 👍 I will continue using it daily
Simple pricing
Start free and upgrade only when your workflow grows.
Enough for everyday translation
- ✓Up to 4,000 chars per request
- ✓60,000 tokens per month
- ✓50 generation requests per month
- ✓AI translation + proofreading
- ✓Phrase explanations & examples
- ✓Tone tags & follow-up
- ✓Desktop & Web apps
High-capacity plan for professionals
- ✓Up to 100,000 chars per request
- ✓2,000,000 tokens per month
- ✓All Free plan features
- ✓Long-form document translation
- ✓Priority support
One bill, shared seats, and Pro-level limits for every teammate.
- ✓Everything in Pro for every seat
- ✓Minimum 2 seats
- ✓Centralized member and invitation management
- ✓Usage visibility by member
- ✓Stripe billing portal for invoices
Frequently asked questions
Use foreign languages with more confidence
Translate, proofread, and learn in one place with Nico. Start free in seconds.
Free forever — no credit card needed