Lensa is a paid iPhone app used as the second stage after iPhone Photos App Portrait Mode Editing Controls global correction, specifically because it auto-detects and masks the subject's face — sliders like Shadows/Highlights demonstrably affect only the face (not a scarf or background) with zero manual masking, unlike Lightroom Mobile Masking for Eye-Guidance (Select Subject + Brightness/Warmth Contrast) which requires drawing a selection. This automatic masking is the presenter's stated reason Lensa 'is the better tool, at least at the moment' for face-specific portrait retouching, doing in one slider what Lightroom needs complex manual masking to achieve.
Four one-tap preset bundles of increasing intensity that combine skin smoothing, under-eye shadow removal, and teeth whitening automatically on the detected face. Selecting 'none' instead builds the edit manually via individual sliders.
Almost every slider is given an explicit numeric ceiling rather than maxed out (teeth whitening ~8, eye contrast ~8, cheeks ~5) — restraint is treated as a deliberate skill, not an afterthought, to avoid crossing into an 'unrealistic' edit. Eye Bags removal is the notable exception, pushed near full strength.