Evaporation Line vs Positive: How to Tell the Difference with Invert Filters
Is it a real positive or just an evap line? Learn how photo invert filters and AI can reveal the truth on Easy@Home, Wondfo, and strip tests.
You took an Easy@Home or Wondfo strip test, and now you see a faint shadow. Is it a real positive or just an evaporation line? This is the most common question women ask when testing early.
What is an Evaporation Line?
An evap line appears when urine dries on the test strip, usually after the reading window (3-5 minutes). It's colorless and can trick you into thinking you're pregnant. Unlike a true positive, evap lines have no pink or blue dye.
How Invert Filters Reveal the Truth
Our app uses photo invert, exposure, and gamma adjustments to enhance line visibility. When you apply the invert filter, a real HCG line will glow bright—while an evap line stays flat. This technique reads the intensity of test lines that your eyes can't detect.
Works With All Brands
Unlike Premom or Femometer which only work with specific brands, our pregnancy test scanner works with ANY test: Easy@Home, Wondfo, First Response, Clearblue, CVS, dollar store tests—even expired ones. It's the best free alternative to Premom for reading your ovulation and pregnancy tests.
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