krapht Folio

krapht-studio

In-app purchases

About this app

krapht Folio is a fast, precision-engineered multi-layer PDF & CAD blueprint reader built for architects, engineers, interior designers, builders, and anyone working with technical drawings or documents on site.

Unlike ordinary PDF viewers that flatten or hide Optional Content Groups (OCG), krapht Folio gives you full interactive control over every CAD layer inside your PDF drawings—combined with real-time architectural scale calibration, a floating scale ruler, CAD dimension lines, and live polygon area calculation.

■ MULTI-LAYER (OCG) CAD PDF ENGINE
• Inspect and toggle individual PDF layers (Optional Content Groups) on or off in real time.
• Isolate structural grids, MEP piping, HVAC ducts, electrical wiring, or furniture layouts with a single tap.
• Batch toggle all layers ON or OFF instantly.
• Includes a built-in multi-layer architectural CAD sample drawing so you can test every feature right away.

■ PRECISION ARCHITECTURAL SCALE & MEASUREMENT SUITE
• 2-Point Scale Calibration: Drag between any two known reference points on a drawing and enter the real-world distance using the built-in on-screen numpad.
• Offset Crosshair Loupe: High-precision CAD crosshair target sits 45° above your finger so your fingertip never blocks the exact vertex you are snapping to.
• Interactive Floating Scale Ruler: Translucent on-screen architectural scale ruler with dynamic tick marks, 0°/90° quick rotation, 15° angle snapping, and free resize/drag.
• CAD Dimension Lines: Draw permanent, calibrated linear dimension lines with extension ticks and live real-world measurements.
• Polygon Area Calculator: Tap multiple vertices to measure complex room or site areas in real time, displaying both primary area units (m², ha, ft², in²) and pyeong (평).
• Draggable Measurement Nodes: Fine-tune any placed dimension endpoint or polygon vertex at any time—lengths and areas recalculate automatically.

■ FULL MARKUP & ANNOTATION STUDIO
• Pen, Crayon, Highlighter, Rectangle, Circle, Arrow, Text Notes, and Architectural Stamps (Approved, Revise, Hold, Field Verify, Urgent, Rejected).
• Full Undo / Redo history and per-page annotation management.
• Export & Save Annotated PDFs: Embeds all your markups, dimension lines, and area callouts directly into a standard PDF file you can share anywhere.
• Crisp Direct Printing: Print only the currently visible CAD layers along with your annotations.

■ BUILT FOR FOLDABLES, TABLETS & PHONES
• Adaptive workspace optimized for smartphones, tablets, and foldable displays (including Samsung Galaxy Z Fold cover & main screens).
• Smooth 60fps pinch-to-zoom, Sticky Fit-to-Width / Fit-to-Page modes, and auto-hiding toolbars for maximum drawing canvas space.

■ 100% ON-DEVICE PRIVACY
• All PDF rendering, layer parsing, scale measurement, and PDF saving happen 100% locally on your device.
• Zero cloud uploads, zero tracking, and zero ads. Your confidential blueprints never leave your device.

What’s new

Official release of krapht Folio
• Multi-layer (OCG) CAD PDF viewer: Toggle individual blueprint layers on/off in real time.
• 2-point architectural scale calibration with built-in numpad & 45° offset crosshair.
• Interactive floating scale ruler, CAD dimension lines & live polygon area calculator.
• Full markup suite (Pen, Crayon, Highlighter, Shapes, Text Notes & Stamps) with PDF export.