DataFocus Ruler

Virtual reading ruler for tables, text files, and data. Highlight rows to never lose your place in large datasets or dense text.

Never lose your place again when reading large tables, datasets, or dense text. DataFocus Ruler adds a virtual reading ruler to any webpage — a horizontal guide that highlights the current row or line, making it easy to track your position across wide tables, CSV data, financial reports, code, and more. ▸ FREE FEATURES • Horizontal ruler follows your cursor or scrolls with keyboard • Lock the ruler in place to read without moving it • Adjustable opacity and color • Works on any website — tables, lists, code blocks, spreadsheets • Keyboard shortcuts: Alt+R to toggle, arrow keys to move • Lightweight — zero performance impact ▸ PRO FEATURES • Multiple ruler colors and custom themes • CSV export of highlighted data • Table auto-detection and smart highlighting • Row and column guides • Configurable ruler height and position Perfect for: • Data analysts scanning large spreadsheets online • Developers reading log files or JSON tables • Researchers reviewing data-heavy pages • QA engineers comparing table values • Anyone who reads wide tables on the web Built with care by SwiftClip — extensions that eliminate digital friction.