f/oss vs Stops

f/oss is a free light meter for film photography, rebuilt from the ground up as a fully native app. Point the spot-metering circle at your subject and read the exposure instantly. f/oss measures true photometric luminance through your iPhone's camera and is calibrated against professional reference meters. FIVE METERING MODES • Aperture Priority: set f-stop and ISO, get your shutter speed • Shutter Priority: set shutter and ISO, get your f-stop • Exposure Value: read the scene's EV directly • Cine: shutter angle and frame rate for filmmakers • Manual: check your chosen settings against the metered scene BUILT FOR REAL CAMERAS • Camera profiles: save your bodies with their actual shutter and bias limits • Full, half or third stop increments • Configurable shutter, aperture, ISO and exposure bias ranges • Reference lock: freeze a reading and measure scene contrast in stops • Exposure lock for recompose workflows ACCURATE • True spot metering of exactly the circle you see • Full-color light analysis: reads saturated LED and neon light correctly • Verified against professional meters from daylight to low light FREE, NO SUBSCRIPTION Every feature is free, forever. If f/oss saves your shots, there is an optional tip jar.

Stops is a light meter built for film photographers — fast, accurate, and honest about what it measures. Point your iPhone at the scene and read the exposure the way a dedicated meter would: a clean instrument dial, the full shutter / aperture / ISO triad, and an EV readout you can trust. The reflected, averaged meter is free, forever — no trial timer, no paywall on the one thing a light meter is supposed to do. Go further with Stops Pro (one-time purchase, no subscription): - Spot metering — tap any detail to meter a 5% area - Exposure lock — hold a reading while you recompose - Roll logbook — note every frame, then export the roll as a PDF - Reciprocity — long-exposure correction with a per-film curve - ND calculator — dial in any filter and read the corrected time - Sunny 16 — a quick daylight sanity check, free forever - Film profiles — push/pull and reciprocity, saved under your own names Built for how film actually works: - Aperture or shutter priority, your choice - Third-stop precision, snapped to real f-stops and shutter speeds - Calibration offset to match your meter or your camera - Made for 35mm and medium format alike Private by design: Stops reads light through the camera live. Nothing is photographed, stored, or sent — ever. No account. No ads. No subscription. Just a meter that respects your film and your time.