BirthdayOS

Stop juggling Pinterest boards, checklist printouts, and "I'll remember it later" texts. BirthdayOS is a complete kids party planning system that lives in a single HTML file – no subscription, no login, no account needed. Just open index.html and run the whole party from one calm tab.

✨ WHAT'S INCLUDED

• Today – countdown to party day, next deadline, next unchecked task, and budget health at a glance

• Details – party date, venue, theme, start/end time, child's age, and ready-made timeline from "prep week" to "day of"

• Guests – RSVP tracker with kid + parent names, allergies, confirmed/declined status, and seat counts

• Budget – category caps (venue, cake, decor, favors, entertainment), spent vs planned, and cost-per-guest

• Checklist – 27 pre-loaded tasks staged across the weeks before the party, plus your own

• Activities & Theme – games list, playlist ideas, theme mood board, and a shopping list that ties back to budget

🔒 100% PRIVATE & 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 kid's 1st-12th birthday and want the whole thing in one tab

• Moms tired of five party-planning apps, Pinterest tabs, and half-finished spreadsheets

• Anyone who's been burned by paying monthly for event-planning SaaS they used once

• Busy households who want guest list + budget + timeline without spreadsheet gymnastics

One-time purchase. Yours forever.