QR Pro+ vs Echorooms

QR Pro is a fast, privacy‑first QR code maker that works entirely offline on your iPhone. Create QR codes from text or links, fine‑tune error correction (L/M/Q/H), choose dot and background colors, and optionally place a logo/photo in the center with pinch‑to‑zoom. Why QR Pro • Private by design: No accounts, no analytics, no ads, no network calls. • Works offline: Everything happens on‑device. • Readable results: Choose L/M/Q/H error‑correction; increase to H when placing a small center logo. • Color control: Curated swatches for dots and background that keep contrast high for reliable scanning. • Quiet zone slider: Adjust the border (padding) in modules. • Center logo (optional): Square, circle, triangle, star, or heart—pick a photo and pinch/drag to fit. • Easy export: Save to Photos or share from the system sheet. Best practices • Keep dots darker than the background for high contrast. • Use H (30%) error‑correction if you add a center logo, and avoid covering the corner finder patterns. • Leave a quiet zone around the code; 4 modules is a good default. What QR Pro does not do • No sign‑in, no cloud, no tracking, no third‑party SDKs. QR Pro makes clean, scannable QR codes you can trust—perfect for links, notes, contactless menus, labels, and more.

Repeatability Desk groups baseline and follow-up readings with room, position and equipment context. Compare medians and observed spread while keeping exclusions and missing band fits visible. HOW TO USE THE UPGRADE 1. Capture repeated readings with consistent placement and conditions, or inspect clearly labeled examples. Open Desk and identify the session. 2. Add baseline and follow-up readings. Include at least three readings per group for summaries; record a reason for each exclusion. 3. Review medians and observed ranges, save the session and export the CSV with every included and excluded reading. Room capture, saved reading history, detail views, comparison and acoustic planning references remain. Missing band data is no longer filled with synthetic values in measurement reports. WHAT TO KNOW Three to 12 included readings per group for summaries; up to 50 sessions. Band medians need at least three actual band fits. Observed spread is not a confidence interval or proof that treatment caused a change. Device microphones, placement and ambient conditions affect results. Simulator and example readings are labeled and are not acoustic measurements. Envelope contrast is estimated from the capture, not a calibrated independent noise floor or ISO compliance check. iPhone and iPad. No account required.