ReciproMeter vs Airtime

ReciproMeter is a free light meter for film photographers who need dependable long-exposure calculations. Use your iPhone camera to read exposure metadata, select your film stock and aperture, and get an immediate shutter recommendation. When exposure times run long, ReciproMeter applies reciprocity correction using official manufacturer data whenever available. For films where official datasheets stop short, ReciproMeter keeps the distinction clear: • Official manufacturer reciprocity data • Optional community-sourced long-exposure guidance • Optional experimental estimates, clearly labeled as lower confidence Features: • Live camera preview, visible by default, with an optional full-screen exposure view • Guided camera calibration with Match a Trusted Meter, steadier readings, and low-light guidance • Remembered manual EV and external meter input with reference aperture and ISO • Exposure lock for holding a reading while composing • Neutral-density compensation, then reciprocity on the longer time • One-stop exposure bracket that follows the film's reciprocity curve • Favorite films and a built-in library with correction charts and source links • Saved film, aperture, ND, and EI presets • Exposure notes with frame numbers, development results, and protection for unsaved changes • Community and experimental long-exposure tiers as separate opt-ins • Metering ISO / EI override for push-pull workflows • Bulb timer with preparation delays, optional audible cues, and a Lock Screen countdown • Dark mode, light mode, or system appearance Privacy: ReciproMeter does not take or store photos. It only reads camera exposure metadata needed to estimate ambient light. An App Open ad may appear over the loading screen at launch, or on a return to Films, Notes, or Settings after you have been away for at least a minute, at most three times a day. Active metering, timers, note editing, and purchases are protected. The first three launches are ad-free. Startup never waits for an ad after the main screen is ready. The loading screen shows the Remove Ads Forever price when available. Remove Ads Forever is an optional one-time in-app purchase. It removes all advertising with no subscription or expiration. Purchase or restore it in Settings. Advertising privacy choices remain available from Settings where required.

Airtime is a camera app for solo athletes who train away from the phone. Set your iPhone on a stand, start recording, and focus on the attempt. When something is worth keeping, Airtime lets you roll back, preview, trim, and save only the clip you want. Instead of recording a 15-minute video for the last 30 seconds that mattered, Airtime keeps a bounded 100-second rolling buffer while the app is open. Old footage drops away automatically, so warmups, setup time, and failed attempts do not fill your Photos library or your phone storage. Built for short attempts, drills, and repetitions, Airtime helps you save time after training too. No digging through long videos in Photos. No trimming down an entire session just to find one make. Record, train, roll back, preview, trim, save. Features: - 100-second rolling Recording window - Quick save the last 10, 20, 30, 45, 60, or 90 seconds - Use Custom rollback to choose a one-time save length with one gesture - Preview before every save - Trim the start and end before saving - Extend backward in Preview when more buffer is available - Save clips to Photos with add-only permission - Capture in HD or 4K at 30 or 60 fps when supported - Switch lenses and front/back camera while idle - Works in portrait and landscape Airtime is designed for solo training: gymnastics, acrobatics, parkour, skating, dance, martial arts, and any session where the good moment happens before you can reach the record button. Privacy stays simple: no accounts, no analytics, no network features, and no full Photos library access.