HubSpot Mobile App Integration
Your mobile app and your CRM should share the same picture of every user.
When your mobile app and HubSpot don't talk, you get blind spots: contacts that exist in the app but not the CRM, workflows that can't reach mobile users, and a contact timeline that tells half the story. We fix that.
We build HubSpot integrations for mobile apps: bidirectional CRM data sync, HubSpot-triggered push notifications and in-app messages via custom workflow actions, mobile event tracking back into the CRM, and transactional email through HubSpot. Built on .NET and Azure, with our pre-built HubSpot Integration accelerator as the foundation.
What happens when your mobile app and HubSpot don't talk
These are the four patterns we see most often when organisations come to us with a mobile app and a HubSpot instance that are working against each other.
Your CRM and your mobile app are working in isolation
Contacts created in the app never appear in HubSpot. HubSpot workflows can't reach mobile users. Sales and marketing are working with an incomplete picture of the people who actually use your product every day.
Notifications fired from the wrong tool
Basic push notification services can send a message. What they can't do is tie that message to a HubSpot lifecycle stage, a deal pipeline event, or a contact property. The result is generic blasts instead of timely, relevant communications.
In-app messaging disconnected from your contact data
In-app messages that aren't driven by your CRM miss the context that makes them useful: who the user is, where they are in their journey, and what they've already seen. Without that context, you're guessing at what to say and when.
Transactional email scattered across tools
Some email comes from the app backend, some from HubSpot, and none of it is coordinated. Unsubscribes don't sync. Brand consistency suffers. And your contact timeline in HubSpot is missing half the story.
The full HubSpot mobile integration stack
Each capability can be delivered independently or as a complete integration. Most clients start with data sync and push notifications, then extend to in-app messaging and transactional email.
Bidirectional CRM data sync
Mobile app users become HubSpot contacts. In-app actions (sign-up, purchase, milestone reached) become CRM events. Changes in HubSpot (lifecycle stage, deal status, contact owner) flow back into the app in near real time. One source of truth, not two.
HubSpot-triggered push notifications
We build custom workflow actions in HubSpot that trigger push notifications via APNs (iOS) and FCM (Android). A HubSpot enrolment criterion becomes a push notification to the right user at the right moment, with no manual step in between. See our push notification infrastructure service for the delivery layer.
HubSpot-triggered in-app messaging
Custom workflow actions that deliver in-app messages to your mobile users when they are active in the app. Driven by HubSpot contact properties and lifecycle events, targeted to specific segments, and tracked back against the contact record.
Transactional email through HubSpot
Order confirmations, password resets, booking updates, and other transactional messages sent through the HubSpot Transactional Email API. Everything on one contact timeline, with suppression lists respected automatically and no split infrastructure.
Mobile event tracking into HubSpot
In-app behaviour (content viewed, feature used, purchase completed) flows back to HubSpot as custom behavioural events. Your marketing and sales teams can see exactly what mobile users have done, and use that data in workflows, scoring, and segmentation.
Identity bridging
Matching a mobile app user to a HubSpot contact reliably is harder than it sounds, particularly across anonymous sessions, social login, and multiple devices. We build the identity resolution layer that keeps mobile users and CRM contacts in sync without duplication or data loss.
"Talk Think Do has provided us with a unique balance of strategic guidance, enhanced governance and 'make it happen' capabilities, which means we can scale our digital ambitions with confidence. The team are experienced, practical, people who quickly cut to the important issues."
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From integration design to go live
We start with the data model and the workflows, not the technology. You know exactly what will be built before any code is written.
Integration design
We map your data model: which contact properties, events, and lifecycle stages matter to the mobile experience. We review your HubSpot configuration, identify the workflows that need custom actions, and design the API contract between your mobile backend and HubSpot.
You get an integration design document and a clear view of what will be built before any code is written.
Build the integration layer
We build the .NET integration service that sits between your mobile app backend and the HubSpot API. This handles authentication, rate limiting, retry logic, and data mapping so your mobile app works against a stable internal contract, not directly against HubSpot's API surface.
Data sync, event tracking, and the notification delivery layer are built and tested in isolation before being wired together.
Configure HubSpot custom actions
We build and register the custom workflow actions in HubSpot: the actions that trigger push notifications, in-app messages, and transactional email from your workflows. Each action is tested end-to-end against real HubSpot enrolments before go live.
We work with your HubSpot administrators to configure the workflows and confirm the enrolment criteria match your intended use cases.
Testing, handover, and support
We run end-to-end tests across the full integration: data sync accuracy, notification delivery, event tracking completeness, and suppression list behaviour. Edge cases (device token expiry, API rate limits, HubSpot downtime) are handled before launch.
We can hand the integration over to your team with full documentation, or continue as your managed support partner.
You may also need
Mobile App Backends
The .NET and Azure backend layer your mobile app and HubSpot integration depend on. BFF pattern, REST APIs, event-driven architecture, and SaaS integrations built for mobile demands.
Learn more Push notificationsMobile Push Notifications
APNs and FCM delivery infrastructure, custom notification actions, rich notifications, and delivery analytics: the server-side layer that HubSpot-triggered push notifications depend on.
Learn more Mobile appsMobile App Development
React Native apps for iOS and Android, with the in-app messaging handlers, notification receivers, and event tracking your HubSpot integration needs on the client side.
Learn moreFrequently asked questions
What is a HubSpot custom action for mobile notifications?
HubSpot workflows can trigger standard actions like sending email or updating a contact property. Custom actions extend that list with your own capabilities. We build and register a custom action in HubSpot that, when triggered by a workflow enrolment, sends a push notification to the relevant mobile app user via APNs (iOS) or FCM (Android).
The result is that your HubSpot team can configure when and why a push notification fires, using all the contact data, lifecycle stages, and segmentation HubSpot already provides, with no engineering involvement once the action is set up.
How does CRM data sync work between a mobile app and HubSpot?
We build an integration service that listens to events from your mobile app (via your backend API) and writes them to HubSpot using the Contacts, Events, and Timeline APIs. In the other direction, changes in HubSpot that are relevant to the mobile experience are pushed to your backend via HubSpot webhooks.
The sync is near real-time for most operations. We build in idempotency and retry logic so transient failures don't result in duplicate records or missed updates.
Is this the same as HubSpot's native mobile SDK?
No. HubSpot's mobile SDK handles certain in-app chat and tracking features within HubSpot's own products. What we build is a deeper, custom integration: push notifications triggered from HubSpot workflows via custom actions, in-app messages delivered through your own messaging layer, and bidirectional data sync between your app's backend and HubSpot's CRM. It is a bespoke integration, not a wrapper around HubSpot's SDK.
How do you handle transactional email through HubSpot?
HubSpot provides a Transactional Email API (separate from marketing email) for sending operational messages like order confirmations, booking updates, and password resets. We integrate your mobile backend with this API so transactional email is sent through HubSpot, appears on the contact timeline, and respects suppression lists automatically.
This means one contact record with a complete communication history, not a fragmented picture split across your backend mail service and HubSpot's marketing tools.
Can HubSpot trigger in-app messages as well as push notifications?
Yes. We build custom workflow actions for both push notifications (delivered via APNs/FCM when the user is not in the app) and in-app messages (delivered via your app's messaging layer when the user is active). The two channels are complementary. HubSpot workflows can trigger either or both, depending on enrolment criteria and the user's current state.
Do you need to rebuild our existing mobile backend to add this integration?
Not necessarily. If you have an existing mobile backend, we add the HubSpot integration as a service alongside it. If you are building the backend from scratch, we design the HubSpot integration in from the start. Either way, the integration is isolated from your core business logic so a HubSpot API change doesn't cascade into your app.
How long does a HubSpot mobile integration take to build?
A focused integration covering data sync, push notifications, and transactional email typically takes six to ten weeks from design to go live, depending on the complexity of your data model and existing backend architecture. Book a free consultation and we can give you a realistic estimate based on your specific setup.
Ready to connect your mobile app to HubSpot?
Book a free 30-minute consultation. We'll map your current setup, identify the integration points that will have most impact, and give you an honest view of what it will take to build it properly.
Book a free consultationor call 01202 375647