BirthdayPartyOS

Throw the perfect birthday in one private offline app - kids party or milestone adult. Ten tabs. One file. Yours forever for one price. A theme picker (unicorn, superhero, princess, dinosaur, rainbow, space, garden, milestone-adult) that sets the vibe. A guest list with RSVP yes/maybe/no, kid vs adult, plus-ones, ages, allergies, and notes. A live head count math so you order the right amount of pizza and cake. A venue card with location, address, start/end time. A decor checklist with where-to-buy and a live running budget bar across decor, food, and favors. A food + cake + drinks menu with cost, when-to-order/prep notes, and done status. An hour-by-hour schedule with a one-tap activity timer for cake-singing, pinata, freeze dance, craft station. An activities catalog by age range with supplies and a photo-reminder checklist so you actually catch the cake reveal. A wish list to share with family, gifts received log, and a thank-you tracker with a fill-in-the-blank sample note. A favors list with unit cost, quantity, and ready status. A post-party thank-you progress meter. Settings for profile, party date, total budget, JSON export and import, and full reset. Every input saves locally to your device. Nothing goes to a server. No account, no subscription, no app store, no annual fee. Works on laptop in any browser, and adds to your iPhone or Android home screen as a standalone app for offline use on the day.

WHAT'S INCLUDED

• Guest list with RSVP yes/maybe/no, kid + adult, plus-ones, allergies, notes
• Theme picker: unicorn, superhero, princess, dinosaur, rainbow, space, garden, milestone-adult
• Venue + address + start/end time card
• Decor checklist with where-to-buy and live running budget bar
• Food + cake + drinks menu with cost, prep timing, done status
• Hour-by-hour party schedule with one-tap activity timer
• Activities + games by age range with supplies and done status
• Photo reminders so you catch the cake reveal
• Wish list to share with family + gifts received log
• Thank-you tracker with fill-in-the-blank sample note
• Favors / goody bags: unit cost, quantity, ready status
• Settings: party date, age, host name, budget, JSON export / import / reset
• Single HTML file - laptop + iPhone + Android home screen, fully offline

100% PRIVATE AND OFFLINE

All data stays on your device. No server, no cloud, no account. Works completely offline.

WORKS ON ALL DEVICES

Open on laptop, add to home screen on iPhone (Safari) or Android (Chrome) as an app. One file, all devices.

INSTANT DOWNLOAD

Download once, use forever. No subscription, no renewal, no expiry.

PERFECT FOR

• Parents planning a kids birthday party (any age)
• Adults celebrating milestone birthdays - 30, 40, 50, 60
• Hosts with 20+ guests who need a real RSVP system
• Parents coordinating allergies, plus-ones, and head count
• Anyone who wants the wish list, gifts, and thank-yous in one place
• Families who want to throw the perfect party without a planning subscription

Questions? Message us on Etsy - we reply within 24 hours.