Vector PDF extraction
Open a datasheet or paper PDF and Curvegrab reads the actual vector paths in the file. No pixel interpolation — just the curve geometry the PDF already contains.
Native Mac graph digitizer
Pull exact data from any chart or PDF
Curvegrab opens vector PDFs and raster images, calibrates your axes, and exports the numbers behind every curve — as CSV, Excel, or JSON.
Everything you need to recover data from a chart
Four axis types
Calibrate linear, logarithmic, date and time, or polar axes. Place three reference points and Curvegrab converts every picked coordinate into real-world values.
Auto-trace by colour
Select a curve's colour on screen and Curvegrab traces the entire line in one step, producing a dense sequence of data points without manual clicking.
Manual point picking
Click to place individual points anywhere on the chart. Zoom in for precision, then move, add, or delete samples until the dataset matches the source exactly.
CSV, Excel, and JSON export
Send extracted data straight to a spreadsheet, script, or analysis tool. Each dataset exports with axis labels and calibrated values, ready to use without further editing.
Offline, no account
Curvegrab runs entirely on your Mac. No internet connection required, no sign-in, no data sent anywhere — confirmed by the App Store's Data Not Collected disclosure.
From chart image to spreadsheet in minutes
Built for the job
Free to start, Pro for the full toolkit
The free tier covers the core workflow. A one-time Pro unlock at $29.99 removes document limits, unlocks all export formats, and includes future feature updates. No subscription, no recurring charge.
A proper Mac app
Written in SwiftUI as a document-based macOS app. It uses system file dialogs, native keyboard shortcuts, standard scroll and zoom behaviour, and macOS window management throughout.
The Mac replacement for GraphClick and WebPlotDigitizer
If you have used GraphClick, DigitizeIt, or WebPlotDigitizer, the workflow follows the same concepts. Curvegrab is built for current macOS in Swift — no Java runtime, no browser dependency.