Seeded scenes, zero empty states
Onboarding teaches GN, power fractions, and stop ratios, then opens three editable demos: softbox portrait, two-light product, and gelled rim—ready before you add a single head.
Precision strobe bench · Photo & Video
BoltRatio Flash Lab
Guide-number math, stop ratios, and multi-light power boards—solved on-device so you walk onto set with exact distance, fraction, and a shareable diagram.
Gear bay with real GN ladders
Browse common speedlights, monolights, and pack heads with reference guide numbers, zoom slots, and min/max steps—or add custom heads with your own GN and power ladder.
Locked camera strip + single-source solver
Pin body label, ISO, target aperture, and shutter ceiling once. Enter distance or f-stop and get power fraction, effective GN, and reciprocal answers—feet or meters, live.
A flash workbench that stays in your pocket
BoltRatio Flash Lab is an offline-first studio flash workbench for portrait, product, and event shooters who are done guessing power from napkin scribbles. Stock a gear bay of speedlights and monolights, lock one camera/ISO/aperture strip for the session, then solve single-source distance or power in a tap. For real rigs, drop key, fill, hair, and rim on a visual ratio board, subtract modifier and bounce loss in tenths of a stop, scrub inverse-square falloff on a scaled floor plan, and export a clean lighting diagram—SwiftData only, seeded pro gear and demo scenes, no account and no cloud.
Guide numbers
Stop ratios
Inverse-square
Diagram export
Key/fill/hair/rim ratio board
Drag role chips, set stop offsets from key, and read absolute power per head with live badges like key 1/4 and fill −1.5 stops—no spreadsheet balancing.
Modifier loss & inverse-square playground
Apply softbox, umbrellas, beauty dish, grid, gels, or ceiling bounce loss; drag subject and wall markers to preview background falloff and pin safe stand distances.
Scenes, diagrams, widgets, Shortcuts
Save named setups, duplicate studio vs location variants, export image/PDF via Share Sheet, pin WidgetKit power cheats, and run “Solve flash distance” from App Intents—fully offline.
STEP AStock the bayPick seeded heads or dial custom GN ladders for the kit on set.
STEP BLock the stripCamera, ISO, aperture, and shutter ceiling stay pinned for the whole shoot.
STEP CBalance rolesPlace key, fill, hair, and rim; bake modifier loss into each power badge.
STEP DShare the planExport a clean diagram and keep power cheats on the Home Screen widget.