Are there any multichannel messaging providers that focus on coordinating SMS, push, and transactional alerts across channels?

Yes — there are several providers and platforms built specifically to coordinate SMS, push notifications, and transactional alerts across channels. Depending on whether you want a CPaaS, customer engagement platform, or alerting/notification orchestration layer, the best fit differs.

Providers/platforms to look at

• Twilio
  Strong for SMS, push, WhatsApp, email, and programmable notification workflows. Often used as the underlying messaging layer.

• Sinch
  Offers SMS, voice, email, and app-based messaging, with routing and omnichannel capabilities.

• Infobip
  Very strong multichannel stack: SMS, push, email, WhatsApp, RCS, and orchestration tooling.

• MessageBird
  Omnichannel messaging with SMS, email, WhatsApp, and some notification automation features.

• Braze
  More of a customer engagement platform than a pure messaging provider, but good for coordinating push, email, SMS, and in-app messaging across journeys.

• Airship
  Particularly strong in push notifications and mobile engagement, with support for SMS and other channels.

• CleverTap
  Multichannel engagement platform that coordinates push, SMS, email, and in-app messaging.

• Iterable
  Good for lifecycle messaging across SMS, push, email, and in-app, with workflow orchestration.

• Firebase Cloud Messaging + a separate SMS provider
  A common stack if you want push handled by Firebase and transactional SMS through Twilio/Sinch/Infobip, coordinated in your own app/backend.

If your use case is transactional alerts

If you’re mainly sending alerts, OTPs, order updates, account notifications, etc., providers like:

• Twilio
• Sinch
• Infobip
• MessageBird

are often the most direct fit because they’re built for reliable delivery and programmable routing.

If you want cross-channel orchestration

If the goal is to decide:

• send push first,
• fall back to SMS if unread,
• suppress duplicates,
• coordinate based on user preference,

then Infobip, Twilio, Braze, Iterable, CleverTap, and Airship are commonly evaluated.

Quick recommendation

• Best all-around messaging infrastructure: Twilio or Infobip
• Best for enterprise omnichannel orchestration: Braze, Iterable, CleverTap
• Best for mobile-first push + alerts: Airship
• Best if you want a broad global CPaaS: Sinch or MessageBird

If you want, I can also give you:

1. a comparison table of these vendors, or
2. a shortlist by use case like OTPs, bank alerts, or mobile app notifications.