What This Update Actually Is
HubSpot shipped custom inbound SMS keywords on August 25, 2026. The feature lets you create specific words or short phrases inside your HubSpot SMS settings. When a contact texts one of those words to your SMS number, HubSpot logs it and can immediately trigger a workflow.
Before this update, SMS automation in HubSpot leaned on generic opt-in and opt-out keywords. Marketers didn't have a native way to build campaign-specific keywords that mapped to real business actions. That gap is now closed.
The keywords live under Settings, and the workflow trigger is "SMS replied has been completed." From there, you branch on the specific keyword value. Each keyword also requires a subscription type, which keeps you compliant with SMS consent requirements.
Why HubSpot Shipped This
SMS is one of the highest-engagement channels marketers can use. Open rates hover around 98%, and response times are measured in minutes, not days. But high engagement without tight automation creates a different problem: your team is drowning in replies they can't action fast enough.
The internal frustration this solves is real. Marketers running event campaigns, product launches, or lead gen pushes had to rely on workarounds. They used generic keywords, manual follow-ups, or outside SMS tools that didn't connect cleanly to HubSpot's contact records and workflow engine.
Now, a single branded keyword can connect inbound intent to automated action without a third-party tool or a manual handoff. That directly serves the kind of speed that separates businesses who win deals from those who lose them to faster competitors.
How to Use It Step by Step
Setup happens in two places: SMS Settings and Workflows. Here's the full sequence.
Create Your Keyword
- Go to Settings, then SMS, then Tools.
- Scroll to the Inbound Keywords section and click "Add keyword."
- Type in your keyword (for example: DEMO, REGISTER, LAUNCH) and assign a subscription type.
- Click "Add keyword" to save. To remove a keyword later, click the bin icon on the right side of the list.
Build the Workflow Trigger
- Go to Workflows and create a new workflow or open an existing one.
- Set the trigger to "SMS replied has been completed any number of times anytime."
- Add a Branch step. Choose either "Select property" and pick "Inbound SMS keyword," or go to "SMS Replied," search for "inbound SMS keyword," and select it.
- Check "Create a separate branch for each value in this property," then click Next.
- Select your keyword from the dropdown for each branch.
- Add the actions you want each branch to fire, then save the workflow.
That's it. When a contact texts your keyword, HubSpot captures it, routes it through the branch, and fires the right automation in seconds.
What It Touches in Your HubSpot Strategy
This update sits at the intersection of Marketing Hub, Service Hub, and your Workflows engine. But the ripple is wider than it looks.
Contact records and lists: every inbound keyword reply is tied to a contact record. That means you can segment by keyword, build active lists of humans who texted DEMO versus REGISTER, and personalize every downstream touchpoint based on that signal.
SMS subscription management: because each keyword requires a subscription type assignment, this feature keeps you inside proper SMS consent frameworks. It's not just automation; it's compliant automation.
Workflow branching logic: the keyword property behaves like any other branch value inside HubSpot's workflow engine. That means you can combine it with other conditions. For example, you can build a branch that fires only when a contact texts DEMO and has a lifecycle stage of Marketing Qualified Lead. If you've been exploring how HubSpot handles multi-condition branching, conditional property logic with combination operators is worth a look alongside this update because the two features layer well together.
Key Takeaway
Each SMS keyword creates a segmentable data point on the contact record. Build active lists off keyword values and you have a real-time intent signal you can use in ads, email sequences, and sales tasks, not just SMS.
Reporting: because the keyword is a property, it's reportable. You can measure how many humans replied with each keyword, which keyword converts to pipeline fastest, and which campaigns drove the most inbound SMS replies. That data lives inside HubSpot, not in a silo.
Campaign use cases where this shines most:
- Use a keyword like REGISTER on event signage so humans can text in and get added to an event list and confirmation sequence immediately.
- Use a keyword like DEMO to route inbound sales interest directly into a deal creation workflow and notify a rep in seconds.
- Use a keyword like JOIN to grow your SMS subscriber list from a print ad, podcast call to action, or retail signage, then enroll them in a nurture sequence automatically.
- Use a keyword like SUPPORT to create a Service Hub ticket automatically when a customer texts in, routing them to the right queue without a human in the loop.
Key Takeaway
SMS keywords are intent signals at their rawest. A contact who texts DEMO is further down the funnel than one who filled out a generic form. Treat keyword replies as high-intent triggers and connect them to your fastest, most personalized follow-up sequences.
Who Should Care Most
This feature is available to Marketing Hub Professional, Marketing Hub Enterprise, Service Hub Professional, and Service Hub Enterprise. Here's who should move on it first.
- Event marketers who promote in-person or hybrid events and want a frictionless registration channel beyond a landing page form.
- Demand gen leads at companies running multi-channel campaigns where SMS is a top-of-funnel touchpoint and they need those replies to route cleanly into HubSpot without manual work.
- Marketing ops leaders who want SMS intent data living on the contact record so it feeds list segmentation, scoring, and reporting natively.
- Service teams using Service Hub who want to offer a text-in-to-open-a-ticket option without adding a new tool or building a custom integration.
- Growing businesses with retail, brick-and-mortar, or high-volume B2C audiences where SMS outperforms email as a conversion channel.
George's Take
I've been inside a lot of HubSpot portals where the SMS tool was essentially decoration. Humans would reply to campaigns and nothing happened because there was no clean trigger for inbound replies. Custom keywords change that. What excites me most isn't the keyword itself; it's what the keyword represents on the contact record. It's an intent signal. It's a segmentation point. It's a workflow trigger. And it all lives inside HubSpot, which means your team doesn't have to stitch together another tool to act on it. If you're already running SMS in HubSpot and you haven't mapped out your keyword strategy yet, that's the conversation I'd want to have with you first.
“A contact who texts your keyword isn't just replying. They're raising their hand. The only question is whether your automation is fast enough to catch them.”
Speed matters here more than most marketers realize. The research is clear: the first business to respond wins the conversation at a disproportionate rate. If you want a deeper look at why response time is now a competitive advantage, the Time to Win framework connects directly to why automated SMS keyword workflows aren't a nice-to-have; they're a revenue decision.
Ready to build out your SMS keyword strategy inside HubSpot? Book a strategy call with the Sidekick team and we'll map it to the workflows, lists, and campaigns already in your portal.
Frequently Asked Questions
What are custom inbound SMS keywords in HubSpot?
Custom inbound SMS keywords are branded trigger words you define inside HubSpot's SMS settings. When a contact texts one of those words to your SMS number, HubSpot logs the reply and can automatically fire a workflow. Examples include words like DEMO, JOIN, or REGISTER tied to specific campaigns or actions.
Which HubSpot plans include custom inbound SMS keywords?
Custom inbound SMS keywords are available on Marketing Hub Professional, Marketing Hub Enterprise, Service Hub Professional, and Service Hub Enterprise. They're not available on Free or Starter tiers as of the August 2026 release.
How do I set up an SMS keyword workflow in HubSpot?
First, create your keyword under Settings, SMS, Tools, Inbound Keywords. Then in Workflows, set the trigger to "SMS replied has been completed," add a Branch step, select the "Inbound SMS keyword" property, enable separate branches per value, and choose your keyword from the dropdown. Save and activate.
Can I use multiple SMS keywords for different campaigns?
Yes. HubSpot lets you create as many custom keywords as you need, each tied to its own subscription type. In your workflow, you can branch on each keyword value separately, so DEMO routes to a sales sequence while REGISTER routes to an event confirmation, all inside a single workflow.
Does the inbound SMS keyword appear on the contact record?
Yes. The inbound SMS keyword is captured as a property on the contact record when they reply. That means you can use it to build active lists, filter contacts, trigger additional workflows, and include it in custom reports to measure which keywords are driving the most engagement and conversions.
What happens if a contact texts a keyword that isn't set up in HubSpot?
If a contact texts a word that doesn't match any custom keyword you've defined, HubSpot won't trigger a keyword-based workflow. The message will still be logged as an SMS reply on the contact record, but no automated keyword branch will fire. Only exact matches to your configured keywords trigger automation.
