Texting for what you build.
Pick the messages your customers need. RelayKit gives your AI coding tool one build guide, then handles the sending, registration, delivery, and replies.
You choose the workflows. Your AI tool does the wiring.
Select your vertical
Then pick your workflows and their messages.
Preview and test
Use realistic values and send real texts to your testers.
Install the skill
One command teaches your AI tool the workflows you picked.
Go live
Finish registration. Approval usually takes 2–3 days.
Your workflows, handed to your AI tool.
Every workflow is a set of texts, already written. Switch on the ones you need. One command installs them as a skill, and your AI tool wires them into what you’re building.
Appliance repair
9 messagesChange the words, not your code.
Every text your product can send lives here, already written. Edit one and that’s what sends from now on. Nothing in your code changes.
Find your vertical.
Every line of work has its own moments when a text matters. RelayKit knows yours.
Pick your industry
Pick your specialty
Nutrition & meal planning apps
Meal-log reminders, streak saves, weekly plan alerts. The texts that keep users logging before the habit breaks.
Build for one, or a hundred.
Text your own users, or run a platform and text your customers’ users. Every message comes written both ways.
Texting your own users.
FixFlow’s coming Thursday.
Texting your customers’ users.
Phil’s coming Thursday.
One brand, three proofs.
Before you can text in the US, carriers require a one-time registration. Your legal entity, web domain, and website have to prove one consistent brand.
Legal entity
Your LLC, corporation, or nonprofit is on file with the state under a legal name that includes your brand’s name.
Domain and email
You own a domain that includes your brand’s name, with an email address at that domain.
Your website
Your live website shows your brand’s name and explains what you do, with your contact email and legal name in the footer.
Brand: Acme
The rulebook you won’t have to read.
US carriers put real barriers in front of texting, and they reject freely. Most platforms hand you the rulebook. We just handle it.
Registration
Your organization goes into a central registry. Legal name, tax ID, website, and what you plan to send.
Their forms, your research, filed blind.
Collected during setup, filed for you.
Carrier review
Reviewers check your registration and messages before you can send. Every rejection restarts the clock.
Two to three weeks, fingers crossed.
Prepared to pass the first time, usually 2–3 days.
Consent requirements
You have to prove every recipient agreed to your texts — how, when, and to what. Reminders and marketing are separate agreements.
Write your own opt-in language, hope it holds up.
The words written, placed by your AI tool, opt-outs enforced.
Your website
Reviewers visit your site looking for texting terms posted, a working contact email, an organization that matches the registration.
A checklist and a link to the docs.
Reviewed by us first, and every fix comes as a prompt for your AI tool.
Message rules
STOP has to halt messages instantly, HELP has to get an answer, and whole content categories are banned.
Your code, your problem.
Messages written to pass; STOP and HELP answered automatically.
Build free. Send for $19 a month.
No credit card. Pay when you go live. Full refund if registration is not approved.
Go live
Includes 500 messages. Additional messages $8 per 500. Volume pricing available. Marketing texts add $10 a month.
Questions builders ask.
Do I need a separate SMS provider?
No. RelayKit is the sending layer; your app calls RelayKit and there’s no other provider to set up or pay.
Your app makes one call and a text goes out. Use the SDK or the plain API. Your AI coding tool integrates either one from our AGENTS.md.
Sent, delivered, failed, and replied events are recorded so your app can react to them. The wording of every text lives in RelayKit, so you can change it without touching your app.
Does RelayKit handle 10DLC registration?
Yes. That’s the US carrier registration every sender needs; we write the filing and file it for you.
10DLC is how carriers approve an organization to send texts from a normal ten-digit number. We prepare the filing, submit it, and track it through review.
If anything comes back for a fix, it arrives as a prompt you can hand to your AI tool.
Do I need a registered business to send texts?
Only to go live, and it’s every provider’s requirement, not ours. An LLC, a corporation, or a nonprofit all work, plus a real website. You can build and test without one though.
Carriers verify who’s sending before they approve anyone, which is why every SMS provider asks for a registered organization and a live website. If you’re forming one, it’s a state filing that usually takes days.
Build, integrate, and test now; the requirements only matter when you’re ready to go live. Every filing is checked against the reviewers’ own checklist before it goes anywhere.
Does it work with my stack?
Yes. RelayKit works with whatever you’re building — an app, a site, a service, a business tool — and most people don’t write the connection themselves. Their AI coding tool does it from our setup instructions.
Our instructions are written for tools like Cursor, Claude Code, and Windsurf. Once you’ve worked out with your tool which moments should send a text — worth doing properly, since your workflows are yours and the texts should fit them — hand it the instructions and it builds the sending, the replies, and the settings.
Next.js with Supabase and Stripe gets the smoothest path because that’s what we built and tested against first, but Rails, Django, Laravel, plain Node, no-code builders — anything that talks to the web — works the same way.
How long until I’m sending real texts?
Today, to your own phone, teammates, or clients. To your users, after registration, which usually takes 2–3 days. The whole integration is built and tested before you register, so approval is the only wait.
Verified testers receive real texts immediately, so you can build and check the whole flow the day you start.
Registration runs in the background. When it clears, the same code starts reaching your users with no changes.
Can I send outside the US?
No. Sending is US-only by design. It closes the door on the most common SMS fraud.
International routes are where premium-rate fraud concentrates. Blocking them removes an entire class of abuse from your account.
If your product needs sending outside the US, RelayKit is not the right fit today.
Give your AI tool the whole texting feature.
Everything’s written and waiting. Start today, register when you’re ready.