User account text messaging for your app.
Payment failures, security alerts, trial endings — the messages a customer needs to see before the damage is done.
Free to author & testNo credit cardUS & Canada
Acme: Card ending 4242 was declined. Update payment to keep your account active: yourapp.com/billing
Our free message templates are live.
Sending arrives Summer 2026.
A text can change the outcome.
A payment fails on a Friday evening. The customer fixes it from their phone before the account lapses.
Account events messages, included.
All nine message categories are included — one registration.
Acme: Card ending 4242 was declined. Update payment to keep your account active: yourapp.com/billing Reply STOP to opt out.
Acme: Your trial ends in 3 days. Choose a plan to keep your account: yourapp.com/billing Reply STOP to opt out.
Acme: Your subscription change is confirmed. View the details in your account: yourapp.com/billing Reply STOP to opt out.
Acme: New sign-in from Chrome on Mac, Denver. Not you? Secure your account: yourapp.com/billing Reply STOP to opt out.
Acme: Your account has been suspended. Review the details and next steps here: yourapp.com/billing Reply STOP to opt out.
Acme: $129.00 is due Jun 28. Pay or review: yourapp.com/billing Reply STOP to opt out.
Make the messages yours, without breaking them.
Preview every message, edit the wording, or add your own fields.
The parts that keep you compliant stay locked.
Preview with your data
Enter a value once and it shows in every message.
Customize any message
Open the variable list and drop one in.
Q&A: Account event messages
Why send billing alerts by text instead of email?
Because card-declined emails don't get read. They land in spam, get buried in a promotions folder, or sit unread until the account lapses. A billing alert by text reaches the customer in seconds — which is the difference between a retry and a churn event.
Can I add an upgrade offer to a trial-ending text?
No — and this one matters. A trial-ending text with a discount code changes its legal classification from transactional to marketing, which requires a separate registration and separate consent. Keep the text factual; run promotions through the marketing channel.
What goes in a security alert text?
The event, the device, and a link to act on it. A new sign-in from an unrecognized device tells the customer what happened and where to go if it wasn't them. Don't ask for credentials in the message — phishing SMS mimics this exact format, and your customers know it.
How does a customer know which account the text is about?
You put the app name at the start of every message. A generic 'your card was declined' with no sender context reads as phishing. RelayKit prefixes every account message with your workspace name so customers know exactly which subscription to act on.
You build the feature. We handle the bureaucracy.
Every text message carries a stack of carrier rules. We've read all of it, so you don't have to.
Registration handled
Getting approved on your own can take weeks.
Most registrations clear in about three days. We handle the filing, so you can keep building your app.
Messages compliant
Send the wrong kind of message and carriers block it — silently.
Every message is checked against carrier rules before it sends, not just passed through.
Opt-ins & opt-outs covered
Miss a single STOP and the fines add up fast.
We stop instantly. Consent is tracked and enforced at delivery, not wired up by you.
Give your AI tool a build spec, not a pile of docs.
RelayKit generates implementation instructions for your AI tool. Messages, variables, event triggers, testing steps, and integration guidance arrive for smooth integration.
Slots into ShipFast, Supastarter, MakerKit, and Vercel + Supabase.
import { RelayKit } from 'relaykit'; const relaykit = new RelayKit(); await relaykit.appointments.sendConfirmation(customer.phone, { date: 'Fri, Jun 6', time: '2:00 PM', });
That's the send.
Preview list
Your safe audience for sending test messages, before and after launch.
- JoelVerified(555) 867-8842
- SarahVerified(555) 412-5519
- MikeInvited(555) 290-3301
Run test messages through real phones.
Add yourself, your team, your beta testers. Each person verifies once. After that, your app's messages work for them exactly the way they'll work for customers.
Trigger your real flows — a booking, a code, a reminder — and see the whole loop land: sent, delivered, your database updated.
What it takes to go live.
No telecom expertise required. We handle the carrier side.
Choose your messages
Pick the messages your app needs from templates that already know the rules.
Browse the messages →Build and test
Hand the spec to your AI tool, then test the full flow on real phones before launch.
Go live
RelayKit handles registration and delivery. A few days to approval.
Simple pricing.
Build for free
Set up your messages. Add the code to your app. Test with real phones. No credit card.
Go live for $49 + $19/mo
We file your registration with carriers. Approval takes a few days. 500 messages included per month, then $8 per additional 500. Full refund if you're not approved.
What $19/mo includes.
Marketing messages add $10/mo. Volume pricing above 5,000 messages. US and Canada at launch. We don't handle HIPAA, healthcare-regulated workflows, or enterprise procurement.
When a message can't wait, send a text.
Messages from an app only work when someone sees them. Here's how text and email compare.
Industry SMS-vs-email benchmarks, 2025–26 — open and response from SMS-marketing aggregates; email inbox placement from Validity's 2025 deliverability report. SMS open is inferred from delivery, not pixel-tracked; reported email open rates are distorted by tracking-pixel prefetch and blocking.
The rules show up after you start building.
US carriers require these from every business that sends texts. Getting approved can take weeks if not done right.
Registration
Before anything sends, your business gets registered in a central registry that every US carrier checks — legal name, tax ID, website, and what you plan to send. Details have to match your IRS records exactly, or the application bounces.
RelayKit collects this during setup and files the registration for you.
Carrier review
Reviewers check your registration and your messages against carrier rules before you're allowed to send. Other providers typically take two to three weeks — and every rejection restarts the clock, with no guarantee the next round clears.
RelayKit submissions are prepared to pass the first time; approval typically takes a few days.
Consent requirements
You have to collect and keep proof that every recipient agreed to get texts from you — how they opted in, when, and which kinds of messages they agreed to. Someone who signed up for appointment reminders hasn't agreed to marketing.
RelayKit provides the opt-in language and keeps the consent records automatically.
Build a compliance website
Reviewers visit your website looking for a privacy policy with specific mobile-data language, posted terms, and a visible description of your texting program. A missing or half-finished site is the single most common reason registrations get rejected.
RelayKit generates and hosts a compliance site for you — privacy policy, terms, and opt-in page included.
STOP and HELP handling
A reply of STOP has to halt messages to that person immediately, and HELP has to get a real answer — automatically, every time. Getting it wrong is a fast way to get a number shut down.
RelayKit handles both at the delivery layer; when someone replies STOP, we stop.
Message restrictions
Carriers limit what businesses can say over text: entire content categories are banned, links get scrutinized, and messages outside your registered use case can get your number flagged. The rules live across multiple carrier policies, and they change.
RelayKit's templates already follow them, and custom messages are checked before they send — not just passed through.
The messages are ready now.
Sending arrives Summer 2026.
You can start with the messages today. When sending launches, your AI tool wires up the integration, you test on real phones, and registration and opt-outs stay handled behind the scenes.