PhotoMeterProPhotoMeterPro uses three layers — local meter, built-in gear catalog, and optional cloud AI. Here is exactly what each one does.
Not the same as a hardware Sekonic: the iPhone measures reflected light through its camera sensor. AI helps with language and recommendations; the catalog holds structured specs.
EV, ISO, shutter speed, and aperture come from your iPhone camera and exposure math that runs entirely on device.
Camera frames are never uploaded, stored, or sent to any server.
You can use the full light meter with no internet connection and no API key.
PhotoMeterPro ships with about 150 camera bodies and 600+ lenses: ISO ranges, shutter limits, mounts, focal lengths, and apertures.
Search, suggestions, and mount compatibility run locally from this structured database.
When you pick gear from the catalog, specs are precise because they come from our curated data — not from AI guesses.
Lens descriptions, tags, scene advisors, meter interpretation, and gear text parsing use our secure backend (Cloudflare Workers) and OpenAI.
Only text you type is sent: camera/lens names, scene or intent, locale, experience level, and optional live EV number.
Photos and live camera frames are never sent. The OpenAI API key lives on the server — never inside the iOS app.
When you search or analyze gear, the app merges local catalog matches with AI interpretation of free text.
Structured specs (ISO max, mount, aperture) prefer the catalog; AI fills gaps when you type uncommon gear.
If the network fails, the app falls back to local search and simple offline tag estimates — the meter always keeps working.
No ad trackers, no data sales, no linking AI requests to your identity.
Pro iCloud sync stores gear in your private CloudKit database under Apple's terms.
Free tier: full meter offline + limited daily AI runs. Pro: unlimited AI advisors.
Still have questions? Try the AI Advisor or read our Privacy Policy.