Engauge Digitizer vs PlotDigitizer: Honest Comparison
⚡ Quick Answer
For XY curves — the most common digitizing job — both work, and Engauge Digitizer does it for $0, offline, with no account. PlotDigitizer’s strengths are exotic graph types (ternary, pie/doughnut, maps, histograms) and a modern interface — but its free online version is feature-limited: auto-tracing and dataset storage require the $40 Pro lifetime license. Choose Engauge for free, private, offline XY work; choose PlotDigitizer Pro if you regularly digitize non-XY chart types.
Head-to-Head Comparison
| Feature | Engauge Digitizer | PlotDigitizer |
|---|---|---|
| Price | Free, no tiers | Free online (limited) / $40 Pro lifetime |
| License | Open source | Proprietary |
| Platforms | Windows, Mac, Linux | Windows, Mac, Linux |
| Online version | None (desktop only) | Free online app (limited features) |
| Graph types | XY (linear, log, polar, date/time) | XY, bar, ternary, polar, pie, maps, histogram, + more |
| Auto-tracing | Yes (Segment Fill, Point Match) | Pro only |
| Export | CSV / text | CSV, Excel, MATLAB, JSON, + more |
| Offline use | Yes, fully | Pro desktop app only |
| Account needed | No | No for free tier |
A Note on PlotDigitizer’s Own Comparison Page
PlotDigitizer publishes its own “Engauge Digitizer Alternative” page (to digitise graph images, in British spelling, their words). Its criticisms of Engauge are largely fair: XY-only graphs, no web version, a dated interface. What that page understandably leaves out: Engauge costs $0 forever with no feature tiers, works fully offline (your unpublished figures never upload anywhere), and is open source. If those three things matter to you — and for many researchers they matter more than a modern UI — Engauge is the better pick.
Verdict: Which Should You Choose?
- Choose Engauge Digitizer if: you digitize standard XY plots; you want free with no paywall; you work with unpublished/sensitive figures offline; you use Linux; you dislike accounts and subscriptions.
- Choose PlotDigitizer Pro ($40) if: you regularly digitize ternary diagrams, pie charts, maps, or histograms; you want the most polished interface; $40 once is within budget.
- Use both free tiers if: you want zero-install — PlotDigitizer’s free online app or WebPlotDigitizer in the browser, Engauge on the desktop.
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Frequently Asked Questions
Is PlotDigitizer better than Engauge Digitizer?
It depends on the job. PlotDigitizer handles more graph types (ternary, pie, maps, histograms) and has a modern interface — but its free online version is feature-limited, with auto-tracing reserved for the $40 Pro license. Engauge Digitizer is completely free and open-source, works offline, and covers XY curves (the most common case) fully. For standard XY digitizing, Engauge does the job at $0.
Is PlotDigitizer really free?
Partly. The online app is free with limited features (no auto-tracing, no dataset storage). The full-featured desktop app (Windows, Mac, Linux) requires PlotDigitizer Pro — currently advertised at $40 for a lifetime license (50% off $80). Engauge Digitizer, by contrast, is free with no tiers at all.
Which is better for privacy-sensitive data?
Engauge Digitizer — it is a desktop application, so your figures never leave your computer. PlotDigitizer’s free tier runs in the browser (images upload to their servers); the Pro desktop app also works offline.
Can both tools digitize logarithmic axes?
Yes. Engauge supports linear, logarithmic, polar, and date/time axes; PlotDigitizer supports linear, log base 10, log base e, reciprocal, and date/time. For log-scale work specifically, see our logarithmic axes guide.
Ready to try it yourself?
Download Engauge Digitizer free and follow along with this guide.
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