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.
Translation & proofreading
Translate, check, and refine your business writing
Nico is an AI translation app for work emails, chats, and documents, with proofreading for source text written in a language other than your native language. It supports Japanese, English, Chinese, Korean, and Spanish on the web, macOS, and Windows.
Start with what you need to say
Write a client request or a reply to a colleague and choose the target language. If you already have a draft in a foreign language, check the input, native, and target language settings before translating.
Compare the translation and source corrections
For input in a language other than your native language, review the input, translation, and proofreading columns. Correction highlights show changes to your draft, while learning assistance explains words and expressions. Translating from your native language does not automatically proofread the translated output.
Choose a tone for the recipient
Use the Business Email style for client correspondence or Formal for a more formal request. Before sending, check names, dates, numbers, and whether the result still says what you mean.
After trying Nico on the web, sign in to the macOS or Windows app with the same account. Translation and proofreading are available there too. Meeting recording and transcription require the desktop app.
Understand and record multilingual meetings
The desktop AI Meeting Note transcribes and translates without adding a bot, and saves meeting files on your computer.
Get Nico for macOS or Windows
Choose your platform's distribution option, then sign in with the same account to use the app.
Check where your text is sent
Translation and proofreading use external AI. Review local storage and external data flows by feature.
Translation and proofreading questions
- What are the Free and Pro translation limits?
- A free account allows 4,000 characters per translation, with 60,000 tokens and 50 requests per month. Pro allows 100,000 characters per translation and 2,000,000 tokens per month. Tokens are AI processing units, not characters; translation, proofreading, and related processing consume them. See the plans on this page for pricing.
- Does Nico automatically proofread the translated output?
- Proofreading checks the source text when you write in a language other than your native language. Translating from your native language does not automatically run a second proofreading pass on the translation. To check a foreign-language draft, enter that draft as the source text.
- Is my text processed only on my computer?
- No. Text for translation and proofreading is sent through Nico's server to external AI providers such as Groq or Google Gemini. Processing is not offline. Provider retention and training terms have not been verified; check the data handling page and your organization's rules before entering confidential information.
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
Free, and it installs in under a minute.
System requirements and other downloadsSelect 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.
Sent only to produce your result
Your text is sent to AI providers only to generate the translation and proofreading. Nico's server keeps usage counts, not your text, and Nico does not train its own models on it.
History stays on your device
Translation history is saved only on your device, not in a Nico history database. The text being translated is still sent for processing.
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