Q vs PlexiSafe
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Q
Read full descriptionHide full description
Q-Shield Sentinel: post-quantum readiness, honestly assessed. YOUR SCORE, 0โ100 Three short question screens give you a 0โ100 Quantum Resilience Score across five weighted axes: algorithm vulnerability, key-length safety, migration readiness, data exposure and compliance gap. Each result shows the algorithms most at risk, a radar chart, a prioritized roadmap to the NIST post-quantum standards (ML-KEM, ML-DSA, SLH-DSA), your Q-Day estimate and harvest-now-decrypt-later (HNDL) exposure, plus the scoring-method version and the basis of its numbers (your inputs, a model estimate or a what-if scenario). Your first score needs no account: one a day per device. Until then, a result marked "Sample" shows what you will get. CHECK A DOMAIN (NEW) โข On the Score tab, enter a domain you control. Q-Shield makes one TLS handshake to its port 443 and shows the protocol, cipher suite, certificate key, signature algorithm and expiry. โข This is shown apart from your answers: the score from your answers, and the score with the observed input. The observed key can only lower your score or keep it the same โ never raise it. โข Nothing else is probed, and the certificate itself is not stored. โข Sign in to use it, on any plan, including Free. Up to 10 checks a day. QUESTIONNAIRES (SENTINEL ECHO) โข Paste the post-quantum questionnaire a customer sent, or import a text file. Echo sorts each question by topic, from crypto inventory to suppliers. โข It drafts an answer only where your assessment or saved scans back it, citing that record, so you can check it before sending. Other questions come back blank, with the reason; pricing, contract, SLA and supplier questions are marked "only you can answer this." โข Not AI: fixed rules โ the same questionnaire always gives the same result. โข Keys, certificates or passwords pasted by mistake are caught on your device before upload. Export the answers as a document. ADVANCED TOOLS AND SIRI (More tab) โข Source freshness for NIST, the GRI threat timeline, arXiv, your domain and your last assessment. โข HNDL threat map (figures: Professional and Enterprise), labelled as a model estimate, not measured traffic. โข Penetration simulation (Professional and Enterprise): eight Shor attack-vector scenarios against your declared algorithms. โข Siri: security health check, threat explanation, audit log โ status only, never secrets. PLANS โข Free: 3 assessments a month, recent history, 1 questionnaire sorted a month, and domain checks. โข Professional and Enterprise add the 22-page PDF Simulation Assessment Report and higher monthly limits โ Professional: 100 assessments, 20 PDF reports, 200 penetration simulations, 100 Echo drafts; Enterprise: 500, 100, 1,000 and 500. โข Plans are managed by your organization's administrator. Existing subscribers keep their access and can restore it under More โบ Your plan. A SIMULATION, NOT A CERTIFICATION A deterministic, rule-based simulation mapped to NIST post-quantum standards โ not an infrastructure audit, not a certification authority. RSA and ECDSA are not called broken today; they are exposed to data harvested now for later decryption. Q-Shield never asks for or stores your private keys, plaintext or passwords. Results are estimates, not a security certification, and do not guarantee protection against quantum attacks. Decisions based on them are your responsibility. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Requires iOS 26 or later. Also on Mac. In 7 languages. Terms of Use: https://swiftquantum.tech/terms/ ยท Privacy Policy: https://swiftquantum.tech/privacy/
PlexiSafe
Read full descriptionHide full description
Cracked acrylic or polycarbonate panel? PlexiSafe tells you exactly where to drill and what diameter to use to stop the crack from spreading before it is too late. Based on Linear Elastic Fracture Mechanics (LEFM), PlexiSafe calculates the minimum stop-drill hole diameter, evaluates stresses, and gives you an instant verdict: repair safe, warning, or critical. --- WHAT PLEXISAFE CALCULATES --- - Minimum stop-drill hole diameter (d_min) - Stress intensity factor K_I - Critical crack length before fracture - Net stress and stress concentration at the hole - Structural verdict: safe repair, warning, or critical --- HOW TO USE PLEXISAFE --- 1. Enter your plate dimensions: width, thickness, span 2. Enter the crack position and measured deflection 3. Choose your material (Standard PMMA, Reinforced PMMA, or Polycarbonate) 4. Tap Calculate: PlexiSafe shows the drill hole diameter and the verdict --- FEATURES --- - 3 material presets: Standard PMMA, Reinforced PMMA, Polycarbonate - Customizable parameters: allowable stress, fracture toughness K_IC, factor Y - 3 unit systems: mm/MPa, m/MPa, m/kPa - Color-coded verdict (green / orange / red) - Detailed safety margins and inspection recommendation - Full history: name and archive every calculation - Report export (email, AirDrop, print) - 100% offline โ no data transmitted, no account required - Available in French, English, Spanish, Portuguese and Chinese --- FORMULA --- K_I = Y x sigma x sqrt(pi x a) Fracture when K_I >= K_IC d_min = 2 x (x + delta) --- PRIVACY --- PlexiSafe collects no personal data. Everything is stored locally on your device. --- DISCLAIMER --- PlexiSafe is a calculation aid tool. Results are indicative and do not replace the advice of a qualified engineer.
Screenshots
Verdict
The clearest difference is update cadence: Q at fortnightly against PlexiSafe's every 6 months. PlexiSafe's advantage is iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Q sells 3 in-app purchases, starting at $129.99 per month and PlexiSafe sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Q ships an update fortnightly, PlexiSafe every 6 months. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.
| Parameter | Q | PlexiSafe |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly โ better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, Mac โ better | iPhone, iPad |
| Requires iOS | 26.0 | 17.0 โ better |
| Further details โ not scored | ||
| Size | 28 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | EUNMIN PARK | Valerie Otero |
In-app purchases
Q
- Q-Shield Pro โ CISO Gold7 Days trial$129.991 Month
- Q-Shield Enterprise Monthly$499.991 Month
- Q-Shield Starter โ The Analyst$499.00
PlexiSafe
- Small coffee$1.99
- Medium coffee$3.99
- Large coffee$5.99









