IRVeinViewer — free, simple version of SpectraCam

IRVeinViewer allows you to improve the visibility of the veins*, using better penetration of infrared rays through the skin and hemoglobin contrast (Hb and HbO2) in the near infrared range with surrounding tissues. In addition, since melanin (skin pigment) absorption is maximal in the shortwave part of the spectrum, and in the IR region it drops significantly, skin color has little effect on the observability of the veins.

IRVeinViewer is extremely easy to use - launch the app and point your smartphone at the search area. Everything else happens automatically - turning on the backlight, focus adjustment, highlighting the IR image and adjusting the optimal contrast.