Backed byY Combinator

iMessage infrastructure for reaching people at scale.

Build and deploy AI on iMessage to reach people at scale while maintaining quality, trust, and personalized interaction.

Book a Call See how it works
Alex Rivera

iMessage
Today 9:41 AM

Hey! Is the place on Willow St still available?
It is! Would you like to see it?
Yes, tomorrow afternoon?
I have 3:00 or 4:30. What works for you?
3 works for me!
Booked. See you there!

Delivered

In your appViewing booked.

What we do

Make iMessage programmable at scale.

Start trusted conversations

Blue-bubble threads from verified numbers, delivered like native iMessage.

Jamie Chen
iMessageToday 9:41 AM
Hey Jamie, your workspace is ready.
Thanks! Can I invite my team?
Of course. Open Settings → Members → Invite.
Found it. We’re all in!
Great. I’m here if you need a hand.
Delivered

Keep the thread warm

Typing, reactions, and reply context stay intact for AI or human follow-up.

Juniper Café
The new menu looks great.❤️
Thank you! See you soon.

Loop in the right people

Run multi-recipient threads with named senders and clean handoffs.

Viewing on Saturday
Jamie
We’ll both be there at 3.
Maya
Can’t wait to see it!
Perfect. See you both then.

Recover unreachable contacts

Fallback to SMS or RCS when someone is off iMessage.

Sam
Text Message · SMS
Your appointment is now Tuesday at 2. Does that work?
Sent as Text Message
Yes, thank you!

Know what happened

Delivery receipts and webhook-ready status per message.

Taylor
Your order is ready. See you soon!
Read 9:41 AM
ChertMessage statusRead

Read receipts when available.

Voice notes

I’ve sent a quick walkthrough.
Explore the API
Where it works

Built for any workflow where a message should become an action.

Jamie Chen

iMessage
Today 9:41 AM

Hey Jamie, your workspace is ready.
Thanks! How do I invite my team?
Open Settings → Members → Invite. Want a hand with setup?
Yes please, tomorrow at 11?
See you at 11!

Delivered

In your appSetup call scheduled.

Customer storyGetcho

How Getcho Is Moving Its Notifications from SMS to iMessage

Read the story
Integrations

One thread, everywhere your team works.

API docs
Your AI companion
Daily check-inPresentation day
Conversation updated
Chert
Milo AI companion
How did the presentation go?
Better than I expected!
Delivered
What was the best part?
FAQ

Everything you
need to know.

Read the docs
Is this real iMessage, or just SMS branded as iMessage?

Real iMessage. Messages flow over Apple’s iMessage protocol with the blue-bubble UX your customers already trust. We fall back to SMS only if a recipient isn’t on iMessage, and we surface that distinction in the API so you always know which channel a message landed on.

How is this different from sending SMS through Twilio?

Twilio is an A2P SMS pipe: carrier-filtered, 10DLC-registered, and visibly automated. Chert delivers a peer-to-peer iMessage thread that opens with the blue bubble, supports read receipts and tapbacks, and lives in the same inbox as a recipient’s family and friends. Open and reply rates are categorically different because the channel is.

What about deliverability and spam flags?

Because iMessage is end-to-end and tied to Apple ID, it doesn’t inherit the carrier-side filtering that hammers A2P SMS. We rotate sending identities, warm them gradually, and cap volume per identity per day to stay well below the heuristics Apple uses to throttle abusive senders. Anyone promising "unlimited blast" volume is one ban away from disappearing.

How do I connect Chert to the tools my team already uses?

We expose a REST API and webhooks for message events, so you can wire conversations into your CRM, sales tools, voice agents, or internal data store with a few hours of work. We also ship native sync for the common cases (lead created, meeting booked, opt-out received). If you’d rather not build, we’ll handle the integration during onboarding.

Build with iMessage.

20-minute kickoff. We'll talk through your use case and work on integrating iMessage into your application.

Open booking calendar