iPhone and iPad
A light meter for film photographers that shows its work: which camera it measured with, what method it used, and whether the reading has actually settled.
One payment. No subscription, no ads, nothing to cancel.
Every screen states what it measured and how. Nothing is presented as settled until it is.
35mm, medium format, large format. And for a canopy under a panel, in the same app, without paying twice.
Incident metering is cosine corrected in software, so there is no diffuser to buy and nothing to tape over the lens. The limit is printed on the screen: light from outside the frame is not counted.
The reticle states its own angle of view, because a spot size you cannot verify is a number you cannot use. Auto exposure keeps metering the whole frame, so the spot stays a region we defined.
Fix any two of aperture, shutter and ISO and the third is solved, in full, half or third stops. Shutter speeds are shown as a dial actually carries them.
Long exposure correction from each stock's published curve, so a four second meter reading becomes the exposure the film really needs.
Every light source and every spectrum in a single purchase. The assumed spectrum and its lux per micromole factor stay on screen, because your crop depends on that number.
Log a frame to a roll with a note, then take the whole roll out as CSV. Every row keeps the camera settings and the calibration offset that produced it.
The part most apps leave out
Every light meter app on a phone reads the same three values from the same sensor, so none of them can honestly claim to be more accurate than the rest. This one is built to be auditable instead. It states its method, publishes the ISO 2720 constants it uses, names the camera it metered with, and lets you set your own offset in stops against a meter you already trust.
It does not send your readings anywhere and it does not ask for an account.
No subscription, no second purchase for whichever light you happen to be under.