Bear Horn turns your iPhone into a loud bear-deterrent horn for hikes and campsites — no separate gadget to buy or charge, just your phone at full volume. 10 sound types: hiking bells, a barking dog, a wolf howl, human conversation, a campfire, and more. Random intervals avoid a robotic loop. Fully offline. No account, no data collected. One-time purchase, no subscription. Also on Android as "Mountain Bell."