Just Right! is a desktop proofreading application from JustSystems Corporation, the company behind the ATOK input method. It runs locally on Windows and processes large documents quickly using rule-based checks for typos, notation inconsistencies, honorific errors, and redundant expressions. The software works offline, making it suitable for environments with strict security requirements.

The application integrates directly with Microsoft Word, Excel, PowerPoint, and Outlook through add-ins, letting users proofread without leaving their documents. It supports Japan’s public document writing guidelines, making it a common choice for government agencies and newspapers. Optional specialized dictionaries for news writing and medical terminology are available separately. Just Right! uses a one-time purchase model rather than a subscription.