Updated Jan 14, 2026

How To Build An App That Incorporates QR Scanning

Table of Contents

Step-by-step guide to add QR scanning to no-code apps: install a scanner component, map scan data to your database, test on devices, and publish to stores.

QR code scanning is a powerful tool for creating interactive apps that connect the physical and digital worlds. With platforms like Adalo, you can build a mobile app that uses QR codes for event check-ins, inventory management, digital payments, and more - without needing to code. Adalo’s drag-and-drop builder and pre-built QR Scanner component make it easy to integrate scanning features into your app, enabling real-time data updates and seamless workflows.

Key highlights:

No-Code Simplicity: Adalo allows you to create apps 40%-60% faster than traditional methods, with costs far below custom development.
Cross-Platform Deployment: Build once and publish as a Progressive Web App (PWA) or native iOS/Android app.
Versatile Use Cases: QR scanning can log attendance, track inventory, process payments, and validate promotional codes.

How to Build a QR Scanning App in Adalo: 5-Step Process

QR Code Scanning Basics and Use Cases

What Are QR Codes and How Do They Work?

A QR (Quick Response) code is a type of two-dimensional barcode that can hold much more data than the traditional barcodes you see on product packaging. It achieves this by encoding information both horizontally and vertically, using a combination of finder patterns, alignment patterns, timing patterns, and data modules to ensure the data can be read accurately - even if the code is partially damaged.

When used in an app, the QR scanner utilizes the device's camera to read and decode the information stored in the QR code. Once scanned, the app can trigger various actions automatically, like updating a database, navigating to a specific screen, or creating new records. QR codes can store a wide range of information, including website URLs, contact details, Wi-Fi credentials, text messages, or even payment data. Thanks to built-in error correction, these codes remain scannable even if they're slightly damaged.

Grasping how QR codes function is key to effectively using the Adalo QR Scanner component in your app. This feature unlocks a range of possibilities for making your app more interactive and efficient.

Common Use Cases for QR Scanning in Apps

QR code scanning has found a home in many practical applications. For example, it's a game-changer for attendance tracking and event check-ins, offering a fast and efficient way to register attendees and update records instantly. In inventory and asset management, QR codes simplify the tracking of equipment and logging of new assets, eliminating the need for manual data entry.

In retail and payment systems, QR scanning enhances mobile transactions and streamlines processes like managing rental systems or adding items to orders. Shoppers can also use QR codes in stores to quickly access product details, compare prices, or read reviews, making their shopping experience more informed and convenient.

"Adalo's QR code scanner component lets app makers craft interactive, super easy-to-use apps... boosting user interaction by providing swift access to info, links, or actions with just a quick scan." - Bootstrapped.app

With these capabilities, apps can enable faster check-ins, more accurate inventory updates, and smoother transactions - all while being accessible on both no-code web apps and mobile platforms.

Setting Up Your Adalo App for QR Scanning

Adalo

Creating a New Adalo App

Starting your QR-enabled app in Adalo is simple and efficient. Begin by signing in to your Adalo account and opening the Adalo Builder. When creating a new project, you’ll have access to tools like MagicStart and MagicAdd, which use AI to automatically set up your app's database and structure. These tools are particularly helpful for beginners, saving time and effort. In fact, industry data shows that no-code platforms like Adalo enable developers to create and deploy applications 40% to 60% faster than traditional methods, with most projects going from idea to Minimum Viable Product (MVP) in about 90 days.

Adalo apps are built around two key components: Screens (the user interface) and a Database (the backend). The visual builder allows you to drag and drop elements onto your screens, while the database stores all the information your app needs. Every new project comes with a default "Users" collection, which can be customized but not deleted.

Once your project is set up, the next step is to configure the database to handle QR scan results.

Configuring the Backend for QR Data

With your app's interface ready, it’s time to set up the backend to log QR scan data. In the Adalo Builder, click on the Database tab (marked with a red icon) in the left-hand toolbar. Create a new collection to store QR scan results. Depending on your app's purpose, you might name this collection something like "Scanned Data", "Check-ins", or "Visits."

Add the following properties to this collection:

A Text field to store the QR data.
A Date field to record the time of each scan.

To associate scans with individual users, add a Relationship property that links this collection to the default "Users" collection. This approach ensures user information is not duplicated with each scan.

For apps with more advanced features - like checking if a scanned item already exists - you can add a temporary Text property (e.g., "Current Scanned Code") to the "Users" collection. This temporary field stores the scan result immediately after scanning, which can be helpful for filtering lists or triggering actions on other screens.

Keep in mind some of Adalo's database limitations: image and file properties have a maximum upload size of 50MB, and number properties can handle up to 15 digits, including decimals and negative numbers.

Once your database is configured, you’re ready to deploy. Adalo makes it easy to launch your app as a Progressive Web App or publish it natively on iOS and Android - all from a single build, without needing separate rebuilds for each platform.

Adding the QR Scanner Component

Adding the QR Scanner to Your App

Adalo doesn’t come with a QR Code Scanner by default, but you can easily add it from the Component Marketplace. Here’s how: In the Adalo editor, click on the Components (+) icon, head to the Marketplace, search for "QR Code Scanner", and add it to your project.

Once installed, the scanner will appear in your component library. Simply drag and drop it onto the screen where you want it to appear.

Important: The QR Code Scanner only works with native mobile apps (iOS and Android). It won’t function in Progressive Web Apps vs. native apps or standard web previews. To test it, you’ll need to use a physical device via TestFlight (for iOS) or an APK (for Android).

After placing the scanner, adjust its size in the right sidebar. Make sure the scanning area is large enough to capture QR codes easily. A larger area ensures better focus and more reliable code reading. The scanner also supports standard barcodes, such as UPC numbers.

Once the scanner is properly sized and positioned, you can move on to setting up its behavior for scan events.

Configuring Scanner Actions and Data Flows

Now that the scanner is in place, it’s time to define what happens when a QR code is scanned. Select the scanner component, open the Actions tab in the right sidebar, and look for the option labeled Actions when a QR Code is Scanned. This is where you’ll set up your workflow.

When a scan occurs, the scanner records two properties: Data and Encoded Data. The Data property holds the actual information from the QR code, which is typically what you’ll use in your workflows. To save this information, create a Create action that adds a new record to your collection (for instance, a "Scanned Data" collection). Use Magic Text to map the scanner's Data property to the appropriate database field.

Here’s an example: In February 2022, Adalo user Emeka developed a system to track store visits. Scanning a QR code at a storefront triggered a Create action that added a "Visits" record with the scanned Store Code and the logged-in user’s email.

"From data access perspective scanner doesn't change anything - it is just yet another method to input data into the collections."

Victor, Adalo Community Leader

For more advanced workflows, like checking if a scanned item already exists in your database, you can store the scan result in a temporary field (e.g., "Current Scanned Code") within your Users collection. This lets you filter lists or set conditional visibility on the next screen. For instance, to display different content based on whether the item is new or existing, use the Count function: show one group if the count of matching records is 0 (for new items) and another group if the count is greater than 0 (for existing items).

Building QR Scanning Features

With your scanner and data flows set up, it’s time to bring QR scanning features to life in Adalo. These use cases make the most of Adalo’s built-in tools for collecting data and automating actions.

Attendance Tracking and Event Check-Ins

Imagine a user walking into an event and scanning a QR code at the entrance. Instantly, the app logs their attendance - simple and efficient.

Here’s how to set it up:

Create a Check-ins no-code relational database collection with three key properties:
- A Relationship field linked to your Users collection.
- A Text field for the Event ID.
- A Date field to automatically capture the timestamp.
Use an external QR code generator to create static QR codes for each event. Each QR code should include a unique Event ID (e.g., "EVENT2026-001"). Display these codes at event entry points.
On your scanner screen, configure the action to create a new Check-in record. Map:
- The Logged-in User to the User relationship field.
- The Scanner Data to the Event ID field. The Date field will fill in automatically.
To avoid duplicate check-ins or invalid codes, temporarily store the scanned result (e.g., Logged-in User > ScannedCode). Use this to filter records and link to a "Result" screen. This screen can display filtered check-ins matching the scanned code. Use conditional visibility to show a "Check-in Successful" message if matching records exist, or an "Invalid Code" message if none are found.

This same approach can be adapted to other workflows, such as inventory management.

Inventory Management with QR Codes

Taking the same principles from attendance tracking, QR scanning can transform inventory management into a smoother, faster process.

Start by creating an Inventory collection with fields like:
- Product Name.
- SKU or UPC (as a Text field).
- Quantity.
- Any other relevant details about your products. You can also connect Adalo and Airtable to manage this inventory data externally.
Assign each item a QR or barcode containing its unique SKU or UPC. Adalo’s QR scanner can handle both QR and standard barcodes, making it compatible with most inventory systems.
When a user scans an item, store the scanned result temporarily (e.g., Logged-in User > ScannedCode). Then, link to an "Item Details" screen where the inventory list is filtered to show only the item matching the scanned SKU.
On the "Item Details" screen, display the current stock level and include buttons or input fields to adjust quantities. These buttons should Update the inventory record with the new amount.
For items not yet in your database, use conditional visibility to show an "Add New Item" form if no matching records are found. This allows users to scan and add new products on the spot.

QR scanning doesn’t stop here - it’s equally useful for promotional redemptions and payment processing.

Processing Promotional Codes or Payments

QR scanning makes handling promotions and payments fast and convenient.

Promotional Codes

Set up a Redemptions collection with the following fields:
- A Relationship to Users.
- A Text field for the Promo Code.
- A Date field to log the redemption time.
Generate unique QR codes for each promotion, embedding the promo code (e.g., "SAVE20JAN"). Configure the scanner to create a new Redemption record, linking the user and scanned promo code.
To validate codes, store the scanned result temporarily (e.g., Logged-in User > ScannedCode). Link this to a confirmation screen that filters the Redemptions collection by the scanned promo code. Use conditional visibility to display a "Success" message if the code is valid, or an "Invalid Code" message if it’s not. You can also add logic to prevent duplicate redemptions by checking for existing records.

Payments
For payments, QR codes often contain a unique identifier like a User ID or Store ID. After scanning, pass this identifier to a payment processor like Stripe using Custom Actions. For instance, the scanned data can be used as an input for an API call (e.g., https://api.stripe.com/v1/customers), enabling you to retrieve or update payment details without manual input.

With Adalo, you can launch fully functional apps as PWAs or on iOS and Android platforms - no extra rebuilding required.

Testing and Publishing Your QR-Enabled App

Testing Your QR Functionality

Testing your QR scanner thoroughly is a must to ensure it performs reliably on all devices. While Adalo's Preview mode is useful for checking the web version, you’ll need to test on actual devices using simulators, emulators, and real hardware to get the full picture.

For iOS, TestFlight is an excellent tool to evaluate camera focus and scanning speed. Before building, don’t forget to update the camera permission text in your iOS Settings within Adalo to meet Apple’s guidelines. Apple requires a clear explanation of why your app needs camera access - missing this step can result in build or submission failures. Also, double-check your Bundle ID for any extra spaces, as this is a common reason builds fail.

Test your app with both physical and digital QR codes to ensure all actions trigger as expected. Confirm that scanned data is correctly populating database fields, navigating to the right screens, and displaying appropriate success or error messages. To simulate real-world scenarios, you can generate physical test QR codes using external tools.

"Make sure the scanner area is big enough so users can scan QR codes without any hassle."

Bootstrapped.app

Once you’ve verified that the QR functionality works seamlessly across devices, you’re ready to move on to the deployment phase.

Deploying Your App to the Web and App Stores

To publish your QR-enabled app, you’ll need a paid Adalo plan, as trial plans don’t support native publishing or custom domains. For full QR functionality, publishing to both the iOS App Store and Google Play Store is essential.

For iOS, you’ll need an Apple Developer License, which costs $99 per year, and Two-Factor Authentication enabled on a trusted Apple device. In Adalo’s Launch tab, expand the "iOS App" section, then input your Apple credentials, Bundle ID, and an app-specific password. Start by creating a TestFlight build to test the app as part of your MVP app development before submitting it to the App Store. For Android, submission is simpler - use the Launch tab after paying the one-time Google Play Developer fee.

"Apple Requires that when your app requests access to use your user's camera... that you provide an explanation for how your app uses these features."

Adalo Help Documentation

Adalo makes it easy to deploy your app as both a Progressive Web App and native iOS and Android apps - all from a single build.

Conclusion

Adalo makes developing QR-enabled apps a breeze, seamlessly connecting the digital and physical worlds while enhancing efficiency. The process is straightforward: install the QR scanner component, set up your database to log scans, configure the actions triggered by scans, and test everything on native devices.

"Adalo's QR code scanner component lets app makers craft interactive, super easy-to-use apps that read QR codes right inside the app."

Bootstrapped

The potential for businesses is immense. Whether it’s managing inventory, organizing events, running promotions, or streamlining payments, QR scanning simplifies data entry, minimizes errors, and even supports loyalty programs that reward customers for engaging with your physical locations. These benefits highlight how no-code platforms like Adalo are transforming the app development landscape.

One standout feature of Adalo is its single-codebase architecture. You can build your app once and deploy it across the web, iOS, and Android without juggling multiple codebases. Any updates you make are instantly reflected across all platforms, saving time and effort.

Adalo is also designed for production-ready deployment. From a single build, you can publish your app as a Progressive Web App (PWA) builders and as native apps on the iOS and Android app stores, ensuring your app is accessible wherever your users are.

FAQs

How do I test the QR scanning feature on different devices?

To check how well the QR scanning feature performs on different devices, begin by adding the QR scanner component to the appropriate screen in your app. Next, test it by running the app on your target device through Adalo’s Preview app or by publishing a test build for iOS or Android. Make sure to grant camera permissions when prompted, and then scan a QR code - this could be one generated digitally or a printed version.

After scanning, confirm that the app displays the data correctly and functions as intended. Repeat this process on various devices to ensure the feature works seamlessly across different operating systems, screen sizes, and cameras. This step is essential to guarantee smooth performance across all devices your app supports.

What should I know about the limitations of Adalo's QR scanner component?

Adalo’s QR scanner is a plug-and-play feature, designed for quick and easy setup. While it’s convenient, its functionality and design are limited to the preset options, meaning you won’t have the flexibility to tailor it entirely to your app’s unique requirements.

Another key point to note is that every QR scan is counted as an app action. This ties directly to your subscription plan’s monthly action limit. For instance, the free plan includes up to 1,000 actions per month, while paid plans offer higher caps, such as 5,000 or 15,000 actions. If your app relies heavily on QR scanning, keep a close eye on your usage to ensure you don’t exceed these limits.

How does Adalo store data from QR code scans?

Adalo automatically saves all QR code scan results in the same cloud collections that house your app's data. By adding the QR scanner component, you can configure actions like Create, Update, or Delete to store scanned information in a collection you’ve set up - such as "Scanned Codes" or "Visits."

Each scan generates a new record, which can include details like the user’s email, the QR code’s encoded information (e.g., a store name or ID), and a timestamp. Essentially, the QR scanner works like any other input method in Adalo, effortlessly capturing and saving data into your app's database for future use.