Most birthday apps remind you at midnight your time. If your friend is in London and you're in Sydney, that fires at 9am your time — but it's 11pm the night before in theirs. Their birthday hasn't even started. BirthdayBridge finds the window where both of you are awake and fires the notification at the right moment — every year, automatically. No servers. No tracking. No subscription. Free to download. Built by a hobbyist iOS dev who kept missing the moment.