Acoustic Data Transmission on Mobile: A Technical Overview
A technical deep dive into the engineering challenges and solutions for transmitting data acoustically between mobile devices.
Share your digital profile instantly using just sound. Qrblox turns your iPhone into an audio business card and audio QR tool so you can broadcast links, contacts, and richer profile data without a camera scan, NFC tap, or awkward alignment. Perfect for conferences, coffee chats, retail moments, and everyday networking.

Read the latest on Audio Handshakes, Audio QR, sonic sharing, loyalty beacons, QR scanning from photos, and AI-powered QR workflows.
A technical deep dive into the engineering challenges and solutions for transmitting data acoustically between mobile devices.
Discover the concept of audio business cards and how they are replacing NFC and paper cards with a simple, frictionless sound transmission.
Explore how the Qrblox audio handshake app uses sound waves to instantly transfer profiles, enabling seamless networking without requiring a camera scan.
Discover how businesses are replacing traditional punch cards with audio check-ins to create frictionless and engaging customer loyalty programs.
Audio Handshake lets you share your profile with sound waves in seconds. Use Audio QR when scanning is inconvenient, then fall back to photo, screenshot, and gallery QR scanning whenever you need it.
Step 1: Take Photo
Take a picture or screenshot of a QR Code. On the Scanner tab, upload your image.
Step 2: Scan
Click the Add Image button to scan a photo from your gallery to the Qrblox app.
Step 3: Connect
Learn more about the QR code URL on the detail page. View your history, calendar view, and your statistics.
Ready!

Qrblox makes networking feel nearly invisible. One tap broadcasts your profile through sound so nearby phones can receive it automatically. It is fast, contactless, camera-free, and built for real-world moments where traditional QR codes or paper cards create friction.
Share your profile instantly using your phone speaker. No camera scan, NFC tap, or paper business card needed.
Replace printed cards with a frictionless digital handshake that works in conferences, coffee chats, and fast introductions.
Beam links and contact data through sound when line-of-sight scanning is inconvenient, crowded, or low light.
Keep the conversation going with AI chats, saved history, and richer profile interactions after every handshake.
At Qrblox, we are building with a modern AI tech stack made in the USA.
Read summaries of the websites behind the QR codes without leaving the app.
Ask questions about the QR code websites in our chat window.
Play the audio reading of the AI summary from the QR code.
Ask the app to call or text you to talk to the website. Connect with their AI chatbots directly.
See a calendar view of your scans.
Keep track of your scans in the history view.
Free QR code generator in the app and make custom QR codes on the desktop site.
Safely scan and inspect URLs before going to the websites. Avoid quishing, or phishing with QR codes.
See a map of your scans with locations and cities.
View the leaderboard and cities where other users are scanning QR codes.
Get updates from your QR codes by connecting to their feeds directly.
Enter to win a daily prize after scanning at least one code a day.
Check if your perfect handle is available
Letters, numbers, and underscores only
" I love the concept of having a library of all of the QR codes we encounter on a daily basis. It makes it easy to keep track of everything! "
FrankieAndTeddy
Jun 15
" We use this app a lot and like how it saves all of the QR codes we scan in a day. It makes it easy to access. "
Wallysdad88
Aug 30
" Helpful to chat with websites, saves time and I like the history tab. "
Scantastic56
Jul 4
FAQs
Find out more about Audio Handshakes, Audio QR, and how to scan QR codes from your photos.
An Audio Handshake is Qrblox's sound-based sharing feature. It uses your phone speaker and microphone to exchange profile links, contact details, and other data without needing a camera scan or NFC tap.
Qrblox converts your profile or link into a short sound signal. Another nearby device listening with Qrblox can decode that signal and open the shared information instantly.
You can share your digital profile, contact details, links, and other compact data payloads. It works like an audio business card and can also support audio QR-style sharing flows.
Audio Handshake is helpful when scanning is awkward or impossible, like in low light, crowded spaces, or fast networking moments. It removes the need for line-of-sight alignment and makes sharing feel more seamless.
No. Qrblox supports both. You can use Audio Handshake and Audio QR for camera-free sharing, then still scan QR codes from printed surfaces, screenshots, and photos in your gallery whenever that is more convenient.
Yes. Qrblox can work like an audio business card app, making it easy to share your profile at conferences, coffee chats, events, and quick introductions without paper cards or awkward scanning.
Yes absolutely, use Qrblox to add photos to your app and scan QR codes in your gallery.
Using the Qrblox app, simply upload the picture to the app on the top left of the Scan tab to open the QR code from a picture.
If you have the QR codes in your phone photo roll, just add them to the app to scan.
Yes add the photo to your QR codes in the Qrblox app and you can scan the URL and view the details.
Just use your camera or screenshot the QR code to add the photo to your gallery. Then use the Qrblox app to scan the photo!
Upload the photo to the Qrblox app in the Scan tab and then you can visit the URL, inspect it, or see AI-generated details in the detail view tab.
Get started today!
Try Audio Handshakes, Audio QR sharing, gallery QR scans, and AI-powered follow-up chats on iPhone and iPad.