Caliper is a fast, native Mac app for marking up and measuring PDF drawings — built specifically for architects, engineers, and contractors
Caliper is a fast, native Mac app for marking up and measuring PDF drawings — built specifically for architects, engineers, and contractors. Open a drawing, calibrate the scale, take off areas, redline, drop stamps, and more, with every line kept as crisp vector data from open to save.
MEASURE & TAKE OFF
• Per-page scale calibration with smart distance parsing (feet-inches, fractions, metric)
• Auto-Scale reads scale legends with on-device OCR and sets the scale for you
• Linear ( and dimension chains), polyline, area, and angle dimensions in seven display formats
• Scheduler — create .csv files from area, perimeter, and length dimensions with unique identifiers
• Object Snap locks tools to the PDF's own geometry, so measurements land on the line
MARK UP
• 13 annotation types — lines, arrows, shapes, polylines, freehand pen, highlighter, curves, callouts, clouds, text, and stamps, etc
• Full style control: stroke, color, opacity, dashes, fills, and ten line-end decorations
• Per-tool default styles — set once, draw all day
• Create custom stamps; import any single-page PDF as a stamp or create stamps from any object(s)
• Create custom annotation styles
• Revision overlay — lay one drawing over another with opacity, scale, and color tint to compare sets
EDIT THE PDF ITSELF
• Edit existing PDF text — fix a typo or update a note baked into the document
• Marquee cut & delete that preserves vectors — no rasterization, no blur — tint pasted content, vector or pixels.
• Reduce File Size with a quality slider before you share or archive
A WORKFLOW BUILT FOR DRAWINGS
• Multi-tab interface and synced split view — compare two documents in lockstep
• Auto-save writes markups straight into the PDF — one file, no loose attachments, fully re-editable
• Drag-to-reorder, insert, duplicate, and copy pages between documents
• Large-format support (24×36 and up) and hundreds of pages
PRIVACY
Everything happens on your Mac. No account, no cloud, no telemetry — your drawings never leave your machine
PRICING
A one-time purchase. No subscription.
Designed by a licensed architect with decades of experience in architectural design and construction administration as well as software development.