First, let's clear up a common mix-up: true omnichannel marketing means every channel draws from the same customer data, so an action on one channel, like a purchase or a click, shapes what a customer sees on another. Multichannel means running several channels side by side, each using its own data.
With that in mind, this guide looks at how many channels each platform truly covers natively, whether customer data stays unified across those channels, and how pricing holds up as you grow.
Whether you're comparing the best omnichannel marketing software in general or looking for an omnichannel marketing platform for small business use, scroll down for a side-by-side table, then read on for a closer look at each platform.
Our comparison criteria
Channel count alone doesn't make a platform omnichannel. How that data moves between channels matters just as much. Here's what we weighed:
- Channel coverage: How many channels each platform natively supports email, SMS, WhatsApp, social, or CRM) without needing a workaround or third-party add-on.
- Unified vs. siloed data: Whether customer data is shared across those channels or kept in separate systems.
- Automation depth: How much cross-channel automation each platform offers, and what's gated behind higher tiers.
- Pricing: Starting cost and how that cost scales as a list grows.
Mailchimp
Mailchimp's email marketing platform covers the broadest channel mix on this list (email, SMS, websites and social posting) all inside one platform. Its SMS marketing tools are priced separately as an add-on, and AI-built automation flows tie the channels together instead of running each one in isolation.
Best for
- Businesses that want email, SMS, websites & social posting in one platform
Pricing
- Essentials from $13/mo (500 contacts); Standard from $20/mo; Premium from $350/mo
- SMS is priced separately as an add-on, not bundled into the base price
Channel coverage
- Broadest channel mix: Email, SMS (add-on), and WhatsApp (add-on, coming soon) are joined by websites, landing pages, social posting, all inside one platform.
- AI-built automation ties channels together: AI-built email and automation flows connect the channels, including abandoned cart and welcome automations.
- Combined channel lift: Mailchimp users saw up to a 2x higher click rate1 when they used both Email and SMS.
Limitations
- Advanced automation gated: Basic automation is available on all paid plans, predictive segments & behavioral targeting available on Standard+.
- SMS costs extra: SMS adds cost on top of the base plan price.
Klaviyo
Klaviyo ties every channel back to a single customer data platform built around ecommerce, which makes it less of a general-purpose omnichannel pick and more of a deep, store-specific one.
Best for
- Ecommerce brands that want channels unified around a single customer data platform, not a general-purpose omnichannel pick
Pricing
- Free up to 250 active profiles; Email plan from $20/mo (500 profiles); Email + SMS from $35/mo
- Bills on active profiles, so cost scales with list size regardless of send volume
Channel coverage
- Email, SMS, WhatsApp, and CRM: Klaviyo covers email, SMS, WhatsApp, and its own B2C CRM, Customer Hub.
- Deep segmentation tied to store data: Deep segmentation and predictive analytics tie every channel back to store data.
Limitations
- Narrow fit outside ecommerce: Built around ecommerce data specifically, Klaviyo is a narrower fit for non-ecommerce omnichannel use cases.
- Active-profile billing: Costs can spike as a list grows, even without sending more messages.
Brevo
Brevo bundles email, SMS, and WhatsApp without charging by contact count, which keeps costs predictable for teams with a large but rarely-emailed list.
Best for
- Budget-conscious teams that want email, SMS & WhatsApp bundled without a per-contact pricing penalty
Pricing
- Free plan: 300 emails/day, up to 100,000 contacts; Starter from $9/mo (5K emails)
- Priced by email volume sent, not contacts stored; SMS billed separately per message
Channel coverage
- Three channels bundled: Email & SMS live on one platform, with WhatsApp campaigns on Professional ($499/mo) & up.
- Generous contact storage: The Free plan holds up to 100,000 contacts, and paid plans are priced by email volume rather than list size.
Limitations
- Automation gated: Full automation, the piece that connects the channels, starts on Standard ($18/mo), and Free & Starter cap automations at 2,000 contacts.
Constant Contact
Constant Contact coordinates email, SMS, and social from one guided interface, prioritizing simplicity over channel depth.
Best for
- Small businesses that want email, SMS & social coordinated from one guided interface rather than deep channel depth
Pricing
- Lite from $12/mo, Standard from $35/mo, Premium from $80/mo (all at 500 contacts, price rises steeply with list size)
Channel coverage
- Email, SMS, and social in one place: Channel coverage includes email, SMS (add-on), social marketing, and landing pages.
- AI campaign builder on the way: Drafts email, social & SMS assets from one prompt, starting on Standard.
Limitations
- SMS costs extra: SMS costs extra on Lite and Standard, and is only bundled free on Premium.
MailerLite
MailerLite keeps its channel mix simple, covering email, landing pages, and forms without SMS or a CRM competing for attention.
Best for
- Lean teams that want a simple marketing platform beyond just email, without needing every channel
Pricing
- Free up to 250 subscribers (2,500 emails/mo); Comfort from $12/mo (500 subscribers); Power from $25/mo
Channel coverage
- Lightest channel mix in this set: Email, landing pages, and forms make up MailerLite's coverage, with no SMS or CRM.
- Here for the toolset, not channel count: MailerLite is a better fit for its broader marketing toolset than for rivaling the others on channel count.
Limitations
- No SMS: There's no SMS option on any plan.
- Limited automation depth: Automation depth doesn't match dedicated platforms like Klaviyo.
HubSpot
HubSpot ties every channel to a full CRM and sales and service data, not just marketing data, which sets it apart from the marketing-first platforms on this list.
Best for
- Businesses that want every channel tied to a full CRM and sales/service data, not just marketing data
Pricing
- Free tier available; Starter from $15 to $20/seat/mo (1,000 marketing contacts)
- Steep jump to Professional at $890/mo plus a mandatory $3,000 onboarding fee
Channel coverage
- CRM-unified channels: Email, forms, landing pages, live chat, and ads management are all unified inside the CRM.
- SMS is a paid add-on: Unlike Mailchimp, Brevo & Constant Contact, HubSpot's native SMS requires Professional or Enterprise plus an add-on, and sends from US numbers only.
- The real trade-off: HubSpot unifies data across your whole CRM, while Mailchimp, Klaviyo & Brevo offer marketing-first channel depth at a lower entry price.
Limitations
- Steep price jump: Professional costs $890/mo plus a $3,000 onboarding fee, well above the free tier or Starter.
- Automation gated: Real automation and reporting depth is gated behind that expensive Professional tier.
Choosing the right omnichannel platform for your business
The right pick depends less on which platform has the most channels and more on how you'll actually use them. Here's what to weigh:
- Channels needed now vs. later: How many channels you need on day one, and how much room you have to add more down the line.
- Unified data vs. channel count: Whether having customer data unified across channels matters more to you than simply covering more channels.
- Budget: Your available budget and how each platform's pricing holds up as you grow.
- CRM or ecommerce integrations: Whether you need a full CRM or deep ecommerce integrations tied to those channels.
Once you've narrowed it down by those factors, it's worth looking at how Mailchimp stacks up directly against each one: Klaviyo, Brevo, Constant Contact, MailerLite, and HubSpot. You can also take a look at other comparisons, including Mailchimp vs. ActiveCampaign.
Start marketing across every channel with Mailchimp
For growing businesses that want the best omnichannel marketing platform without stitching together separate tools, Mailchimp brings together an email and SMS marketing platform, social posting, and more in one place.
Mailchimp also makes it easy to see how those channels are performing together, so you can easily measure omnichannel marketing success. Explore Mailchimp's plans to find the right fit for your business.
Disclaimers
1 Up to 2x higher click rate: Based on US Mailchimp users who sent both email and SMS campaigns compared to users who sent email-only campaigns from 8/1/23 to 7/28/26. Individual results may vary.