Spf-Screen Polarization Filter
Add an overlay to your screen to better showoff highlights
Screenshots

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Hunter's comment
Hello Friends, Introducing Spf is an open source app which is easy to use and will add a semi-opaque layer to your screen to show low visible and highlighted elements in your presentation or any other design. Spf will help you when you are presenting work on a screen or projector that is not well showing like highlights or fine-details
Spf is a tiny, open source, Mac app that enables you to display a dark overlay on your screen so highlights actually show up!
Link
https://github.com/tannerc/spf?ref=producthunt

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