Q-Day

QDay is your quantum HQ: Q-Day estimate, ecosystem radar, knowledge base, timeline, and local preparation plan. Q-Day refers to the period when sufficiently powerful quantum computers could threaten parts of public-key cryptography such as RSA or elliptic-curve cryptography. QDay presents this as a statistical estimate with a range and sources, not as a fixed prediction. Included features: - Q-Day tracker with estimate, range, and probabilities. - Scenarios: fast, base, and slow readings of the range. - iOS widget to follow the estimate from the Home Screen. - Local reminders, with no account and no data collection. - Quantum Radar: companies, technologies, zones, and signals to track. - Timeline: hardware, algorithms, standards, markets, and major announcements. - Base: short cards explaining RSA, ECC, Shor, PQC, ML-KEM, QKD, and quantum sensing. - Filterable glossary for essential terms. - HQ: briefing, standards, method, sources, limits, privacy, and support. - Local crypto inventory: archives, critical accounts, vendors, certificates, wallets, and secret lifetime. - Preparation: local score and action plan for long-lived secrets, cryptographic dependencies, and vendor questions. QDay does not require an account, does not collect personal data, and does not require another app.