SignalCrafter: Morse Trainer

Morse code, signal flags, and the phonetic alphabet are the kind of skills you either practice or lose. SignalCrafter is an offline kit for learning and drilling classic, non-network signaling, with a high-contrast interface meant to be read outdoors.

The Morse side is a real broadcaster, not just a chart. You set words per minute, repeat count, pause interval, and total duration, then send the message as a screen flash, a tone, a haptic pulse, or any combination. Field protocol presets cover common messages — SOS, Mayday, medical help, food or water, position unknown — so you can practice sending something meaningful rather than random letters.

For flags, there is an A-to-Z hoist builder with optional substitute flags for repeated letters, a readback of what you have spelled, and warnings when a character gets skipped. The offline almanac collects the reference you would otherwise dig for: international Morse, the NATO phonetic alphabet with pronunciation, maritime signal flags and their single-flag meanings, ground-to-air rescue symbols, and the Beaufort wind scale. A Drill tab lets you practice Morse, flags, and phonetics against a running streak and your best streak.

Everything works in airplane mode. There is no account, no cloud, no ads, and no tracking — preferences stay on the device. One honest caveat: this is a learning and reference tool, not a certified emergency beacon, marine radio, or a substitute for proper equipment and official procedures.