# Q-Day — Your quantum HQ

> Your quantum HQ (iPhone/iPad app by Abyssal Group LLC.)

- Source: https://appshunter.io/ios/app/q-day/id6779656000 (this page in markdown: same URL + `.md`)
- Developer: [Abyssal Group LLC](https://appshunter.io/developer/1890559731)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-07-10
- Data updated: 2026-07-31
- User reviews in markdown: https://appshunter.io/ios/app/q-day/id6779656000/reviews.md

## What is Q?

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.


## Version history (last 2 releases)

### 1.0.3 — 2026-07-28

Added a local crypto inventory in Preparation: secrets, vendors, certificates, secret lifetime, local score, and summary sharing.

### 1.0.1 — 2026-07-10

No release notes.

## More apps by Abyssal Group LLC

- [Satcove](https://appshunter.io/ios/app/satcove/id6761635141)
- [Kyber — Password Manager](https://appshunter.io/ios/app/kyber-password-manager/id6774245226)
- [Isulla — Island hospitality](https://appshunter.io/ios/app/isulla-island-hospitality/id6776545710)
- [Nerya](https://appshunter.io/ios/app/nerya/id6780277453)

All apps by Abyssal Group LLC: https://appshunter.io/developer/1890559731

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-31.*