How to Build an Event Lead Capture App with Bubble

Exhibitors at trade shows collect business cards in a bowl and spend three days after the event manually entering data into a spreadsheet. By the time leads are in the CRM, the conversation is cold and half the cards are illegible.

A custom event lead capture app built on Bubble turns a badge scan into a qualified CRM record in seconds. This guide covers the data structure, workflow logic, plugin stack, and cost to build it correctly.

Key Takeaways

• Instant CRM sync: A lead capture app pushes qualified leads directly to HubSpot, Salesforce, or Pipedrive the moment a badge is scanned, not after the event.
• Core data types: Event, Exhibitor, Lead, BadgeScan, LeadNote, and FollowUpSequence form the relational foundation of the system.
• Badge scanning: Bubble's BarcodeScanner plugin reads QR codes from attendee badges on mobile browsers without a native app.
• Realistic cost: An MVP runs $6,000–$14,000 in 4–8 weeks; a full multi-exhibitor platform runs $15,000–$28,000.
• CRM sync is critical: Zapier or Make connector routes new Lead records to your CRM; this integration should be built and tested before the first event.
• Offline planning: Trade show floors have unreliable wifi. Plan for offline lead storage and batch sync on reconnect in the initial scope.

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What Is an Event Lead Capture App — and Why Build It with Bubble?

An event lead capture app is a mobile-accessible web application that lets exhibitors and sponsors scan attendee badges, enter qualification data, add notes, and sync contacts to their CRM in real time during a live event. Generic tools like HiHello or Cvent LeadCapture charge per event and per exhibitor, with no data portability and no integration with the tools your team already uses.

A Bubble-built lead capture app is owned once. You pay for Bubble hosting and your CRM integration tool, not a per-event fee. The leads live in your database, connect to your CRM, and follow your qualification workflow, not a vendor's default structure.

• Owned data: Lead records, qualification data, and scan history live in your Bubble database, not a third-party platform with export limitations.
• Custom qualification: Build your specific qualification questions (budget, timeline, interest level) into the capture form, not generic fields you cannot rename.
• Multi-event reuse: One app serves every trade show, conference, and event your team attends. No per-event licensing.
• CRM-native: Leads push to your actual CRM the moment they are captured, with event name, exhibitor name, and qualification data included in the payload.

A phased build approach using Bubble MVP development means getting badge scanning and CRM sync live quickly. Then layering in analytics and follow-up sequences based on what your team actually uses.

What Features Should an Event Lead Capture App Include?

A functional event lead capture app covers seven features: badge scanning, manual lead entry, qualification questions, notes and tags, lead assignment, real-time CRM sync, and a post-event analytics dashboard.

Build badge scanning and CRM sync first. Every other feature is secondary to those two working correctly under trade show conditions.

• Badge scanning: QR code scan from the attendee's badge populates lead form fields automatically (name, email, company, title) without manual typing.
• Manual lead entry: A form-based entry flow for contacts who do not have a scannable badge, with the same qualification fields as the scan flow.
• Lead qualification: Customizable questions added immediately after the scan, including interest level (Hot/Warm/Cold), budget range, and purchase timeline.
• Notes and tags: Free-form note field and categorical tag selection per lead for post-event sorting and prioritization by the sales team.
• Lead assignment: Exhibitor managers assign captured leads to specific sales reps from the exhibitor team. Reps receive a notification and see their assigned leads in a filtered view.
• Real-time CRM sync: Every new Lead record triggers an API call that pushes the lead with all qualification data to the connected CRM immediately on capture.
• Analytics dashboard: Total leads captured per rep, per event, and per tag category, with conversion rate tracking from captured lead to CRM opportunity.

How Do You Structure the Database for an Event Lead Capture App in Bubble?

Six data types handle the core lead capture structure. The Lead data type carries the most fields because it is the record that flows to the CRM and drives the follow-up workflows.

Set up option sets for interest level, timeline, and lead status before building any pages. These fields drive the qualification logic, the CRM sync payload, and the post-event follow-up trigger conditions.

• Event data type: Fields include name (text), date (date), venue (text), organizer (User), and status (option set: Upcoming/Active/Completed).
• Exhibitor data type: Fields include company name (text), linked event (Event), assigned reps (list of Users), CRM integration type (option set), and CRM API key reference (text).
• Lead data type: Fields include first name (text), last name (text), email (text), phone (text), company (text), title (text), linked event (Event), linked exhibitor (Exhibitor), captured by (User), captured at (date), interest level (option set: Hot/Warm/Cold), budget range (option set), timeline (option set), tags (list of option set values), notes (text), and synced to CRM (yes/no).
• BadgeScan data type: Fields include linked lead (Lead), raw badge data (text), scan time (date), and scanned by (User).
• LeadNote data type: Fields include linked lead (Lead), note body (text), created by (User), and created at (date).
• FollowUpSequence data type: Fields include linked event (Event), exhibitor (Exhibitor), trigger condition (option set), email subject (text), email body (text), and delay days (number).

Understanding Bubble's pros and cons includes being honest about the offline limitation: Bubble is a web app and requires an internet connection to write records. On a trade show floor with poor wifi, plan for a local storage fallback or a brief delay tolerance with a batch sync approach.

How Do You Build the Core Workflows for an Event Lead Capture App in Bubble?

Five workflows drive the lead capture system: badge scan and field population, manual entry, CRM sync, lead assignment, and post-event follow-up. The badge scan and CRM sync workflows are the two that require the most careful testing before a live event.

Test the badge scan workflow with the specific QR code format used by your event's registration platform before the event. Badge QR code formats vary by platform (Eventbrite, Cvent, Bizzabo), and the parsing logic must match the encoding used.

• Badge scan workflow: The BarcodeScanner plugin reads the QR code from the attendee badge. The encoded string typically contains name, email, and company separated by a delimiter. A Bubble workflow parses the string using text operators and pre-populates the lead form fields. The exhibitor rep adds qualification data and submits the form. The workflow creates a Lead record and a linked BadgeScan record simultaneously.
• Manual entry workflow: On form submit without a badge scan, validate that the email field is not empty and does not match an existing Lead for the same event and exhibitor. Create the Lead record with the same fields as the scan flow.
• CRM sync workflow: Immediately after the Lead record is created, trigger a Zapier or Make webhook with the Lead's field data as the payload. The Zap or scenario maps the fields to your CRM (HubSpot contact, Salesforce lead, or Pipedrive person) and creates the record. On successful CRM creation, update the Lead's synced to CRM field to yes.
• Lead assignment workflow: The exhibitor manager opens the unassigned leads view and selects reps from a dropdown on each Lead record. The workflow updates the Lead's captured by field and sends a push notification to the assigned rep with the lead's name and interest level.
• Post-event follow-up: A scheduled backend workflow triggers 24 hours after the Event end date. It finds all Lead records linked to the event with interest level equal to Hot and synced to CRM equal to yes. For each Lead, it triggers the first email in the linked FollowUpSequence via SendGrid.

What Security and Data Requirements Apply to an Event Lead Capture App?

The most critical security requirement in a multi-exhibitor lead capture app is exhibitor isolation. If two competing companies are both exhibiting at the same trade show and using the same lead capture platform, Exhibitor A must never be able to see Exhibitor B's leads under any circumstance.

This isolation must be enforced at the Bubble privacy rule level on the Lead data type. UI hiding is not sufficient.

• Exhibitor isolation: Privacy rules on the Lead data type restrict read and write access to records where the linked Exhibitor matches the current user's exhibitor association. A query from an Exhibitor A user must return zero Exhibitor B records regardless of how the query is structured.
• Rep-level scoping: Exhibitor reps see only their own captured leads (where captured by equals the current user). Exhibitor managers see all leads for their exhibitor. This scoping is enforced in the privacy rule, not just filtered in the UI.
• Data ownership: Lead records belong to the exhibitor that captured them. The event organizer has no access to exhibitor lead data. Privacy rules on Lead must exclude organizer users from read access to other exhibitors' leads.
• GDPR compliance: Attendees consent to data capture in the event's registration terms. The capture app does not need a separate consent step if the event registration covered it. However, the Lead record should store the event name and date as proof of lawful basis for the data capture.

What Plugins and Integrations Does an Event Lead Capture App Need?

Six plugins cover the core operational requirements. The BarcodeScanner and the CRM sync connector are the two integrations that must work flawlessly before the first event. Everything else can be added iteratively.

Test the BarcodeScanner plugin specifically on the devices your team will carry on the trade show floor. Camera access permissions vary between iOS Safari and Android Chrome, and some trade show venues have bright lighting conditions that affect scan reliability.

• BarcodeScanner plugin: Reads QR codes from attendee badges on mobile browsers. Requires camera permission on the device. Test the specific badge QR format before the event.
• Zapier or Make connector: Routes new Lead records to the exhibitor's CRM in real time. Configure a Zap or scenario per CRM type (HubSpot, Salesforce, Pipedrive) with field mapping for all qualification data fields.
• SendGrid plugin: Delivers post-event follow-up email sequences to Hot leads and sends lead assignment notifications to sales reps within the exhibitor team.
• Toolbox plugin: Handles custom JavaScript for badge data parsing when the encoded format requires string manipulation beyond Bubble's native text operators.
• Google Sheets plugin: Provides a bulk lead export fallback for exhibitors who prefer to review leads in a spreadsheet before CRM import, or whose CRM lacks a direct integration.
• Intercom or Crisp plugin: Provides in-app support chat for exhibitors troubleshooting the scan workflow on the trade show floor when their account manager is not physically present.

How Long Does It Take and What Does It Cost to Build an Event Lead Capture App with Bubble?

An MVP covering a single exhibitor with QR badge scanning, manual entry, and basic CRM sync takes 4–8 weeks and costs $6,000–$14,000. A full multi-exhibitor platform with analytics, follow-up sequences, and multi-CRM support runs 8–14 weeks and $15,000–$28,000.

Review Bubble's pricing plans to match your hosting tier to the number of exhibitors and reps using the app simultaneously during live events.

• Growth plan for single exhibitors: A single company using the app for their own trade show presence runs comfortably on the Growth plan at $29/month.
• Team plan for multi-exhibitor: When multiple exhibiting companies each have their own reps using the app simultaneously, the Team plan is needed for concurrent workflow capacity.
• Zapier cost at volume: At high lead volumes (500+ leads per event), consider moving from Zapier to Make's Core plan for better per-operation pricing.

Conclusion

Bubble eliminates manual data entry and gets qualified leads into your CRM during the event. The six data types and five core workflows handle the full lifecycle from badge scan to follow-up email.

Start with badge scanning and CRM sync. Get those working reliably before a real event, then add qualification questions, notes, and follow-up sequences in phase two.

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Build Your Event Lead Capture App on Bubble the Right Way

Badge data parsing logic varies by event platform, multi-exhibitor isolation must be enforced at the privacy rule level, and CRM sync webhooks fail silently if not tested against real badge formats before the event.

At LowCode Agency, we build Bubble apps as a full product team - not a dev shop that hands off code. We scope the architecture, engineer the workflows, and stay involved through launch and beyond.

• Data architecture: We design your data types, option sets, and privacy rules before writing a single element on the canvas.
• Workflow engineering: We build backend workflows, scheduled jobs, and API integrations with proper logic and error handling.
• Plugin configuration: We select and configure the right Bubble plugins for your feature set without unnecessary bloat.
• Role-based access: We implement privacy rules at the database level, not just conditional UI visibility.
• Integration setup: We connect your Bubble app to Stripe, SendGrid, Twilio, and other services correctly from day one.
• Pre-launch testing: We test against real data before deployment so every workflow performs correctly under live conditions.
• Post-launch support: We stay involved after go-live to optimize as real usage data shapes the app.

We have built 350+ products for clients including Coca-Cola, American Express, Sotheby's, and Medtronic. We know exactly where Bubble builds fail and we address those problems before they surface.

If you want your Bubble app built correctly from day one, let's scope it together.