Plot Digitizer
g3data
DataThief III
DigitizeIt
im2graph
GraphClick
Silkscientific UN-SCAN-IT
WebPlotDigitizer - Web based tool to extract numerical data from plots, images and maps.

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Recommended for
WebPlotDigitizer is recommended for researchers, scientists, data analysts, and students who frequently need to extract data from published graphs and charts. It is particularly useful in fields such as biology, engineering, physics, and any other areas where visual data needs to be quantitatively analyzed.
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🔴 Webplotdigitizer Tutorial - A Plot Digitizer to Digitize Graphs
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When comparing WebPlotDigitizer and Diffee, you can also consider the following products.

All-in-One Tool to Extract Data from Graphs, Plots & Images
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g3data is used for extracting data from graphs.
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DataThief III is a program to extract (reverse engineer) data points from a graph.
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Sometimes it is necessary to extract data values from graphs, e.g.
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im2graph graph digitizing software to convert graphs to numbers
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GraphClick is a graph digitizer shareware for Mac OS X which allows to automatically retrieve the original (x,y)-data from the image of a scanned graphor fom QuickTime movies.
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