Interactive Audio Cards

Scan it.
Hear it.

Object to Audio links printed cards to audio through your phone camera. Scan a QR code and listen: a name, a call, a song, a story. The audio lives on your device so it's faster than a search and it works anywhere.

GET IT ON Google Play Card Builder tool →
Overview

How it works

01

Build your card set

Use the Card Builder tool to assign QR codes to your objects and generate printable card sheets from your images.

02

Print & cut

The builder outputs a print-ready PDF. Each sheet holds four cards, with images on the front and QR codes on the back.

03

Load your audio

Place your audio files and the updated CSV database into the app's collection folder on your device.

04

Scan & listen

Open the app, scan any card's QR code, and the associated audio plays instantly.

Reference

CSV database format

Your CSV file is the bridge between physical cards and audio files. Column headers must follow the naming conventions below so the app and builder can recognize them.

Column header pattern Example Role Status
Num_ID Num_ID Unique numerical code assigned to each card Auto-filled
QR_Code_Image_file QR_Code_Image_file Filename of the generated QR code image Auto-filled
contains image image_file, image_file_2 Filename of an image to display on the card front Required
contains audio audio_file, audio_file_2 Filename of the associated audio (mp3) Required
contains field field_name, field_notes Text fields shown on card side B Optional
Important: Leave Num_ID and QR_Code_Image_file columns blank in your CSV before uploading — the Card Builder fills them in automatically. Any row with pre-existing values in those columns will cause a validation error.

Card layout

Each sheet prints four cards (2×2). Cards have two sides — side A shows images, side B shows text and the QR code.

Side A — Front
Card Side A
Side B — Back
Card Side B
Demo collections

Try it with a ready-made set

Each set includes everything you need: a phone package for the app and a print package for your cards. Download both, print the cards, load the phone zip, and you're ready to scan.

🦋

Butterflies of North America

32 species · English common & Latin names · audio pronunciations

A starter set covering common North American butterfly species. Each card shows identification images on the front and species name, family, and habitat notes on the back.

Phone zip coming soon Print zip coming soon
🌿

Common Garden Plants

28 species · Common & botanical names · care notes

Identify and learn the plants in your garden. Cards include common name, botanical name, sun and water requirements, and a seasonal note. Great for gardeners of all levels.

Phone zip coming soon Print zip coming soon

Ready to build a card set?

Upload your images and CSV, configure your options, and download print-ready cards.

Prefer to work offline? Download the standalone desktop version.

Open Card Builder
Get in touch

Contact

Questions about the app, the Card Builder, or setting up a collection? Send a message and we'll get back to you.