Top SMS Marketing Agencies [2026]

Braze is the best customer engagement platform for enterprise B2C brands, Klaviyo dominates DTC ecommerce, and Customer.io wins for data-driven B2C companies with complex user journeys. There is no single "best" CEP — the right choice depends entirely on your business model, data complexity, channel needs, and budget. After implementing all seven of these platforms across 200+ B2C brands, Propel has a clear perspective on where each one excels — and where each falls short.

Key Takeaways

• Braze leads for enterprise B2C ($50K+/year) with true real-time cross-channel orchestration
• Klaviyo is the clear winner for Shopify-based DTC ecommerce at any scale
• Customer.io is best for B2C brands with complex behavioral journeys (healthtech, fintech, subscription apps)
• Iterable offers the best workflow builder among enterprise platforms at a lower price than Braze
• MoEngage and CleverTap are strongest for mobile-first consumer apps with global audiences
• OneSignal is the most accessible entry point for push notification-first engagement
• Your CEP choice is a 2–3 year commitment — switching costs are real, so choose based on where you'll be in 18 months, not where you are today

1. Braze — Best for Enterprise B2C

Braze is the undisputed leader for enterprise-scale B2C brands that need real-time, cross-channel engagement across email, SMS, push notifications, in-app messages, web push, and content cards — all orchestrated from a single canvas.

Ideal customer: B2C brands doing $20M+ revenue with dedicated marketing engineering teams, multi-brand portfolios, or complex cross-channel orchestration needs.

Pricing: Custom, typically $50K–$200K+/year depending on MAU and channels.

Channels: Email, SMS, push (iOS/Android/web), in-app messaging, content cards, webhooks.

What Braze does best: Real-time data processing and cross-channel journey orchestration. A user adds an item to their cart on mobile → Braze processes the event in milliseconds → triggers a push notification 2 hours later → follows up with an email the next morning → adjusts the entire flow if the user converts in between. No other platform handles this level of real-time orchestration as reliably at scale.

Braze's Canvas Flow (their journey builder) is extraordinarily powerful. You can build branching, multi-channel journeys with A/B testing at every node, intelligent timing optimization, and frequency capping that prevents message fatigue. The platform processes billions of data points per day for clients like Burger King, Urban Outfitters, and Grubhub.

Key limitation: Cost and complexity. Braze requires dedicated technical resources — most implementations take 3–6 months, and you'll need at least one engineer who understands the data architecture. For brands under $20M or without a marketing engineering function, Braze is overkill. See our list of best Braze partners if you're considering implementation.

2. Customer.io — Best for Data-Driven B2C Brands

Customer.io is the platform you choose when your user journey is more complex than the standard ecommerce funnel. Its event-driven architecture processes any behavioral data you send it and lets you build automation logic around literally any user action.

Ideal customer: B2C brands with complex user journeys — healthtech apps with multi-step onboarding, fintech products with regulatory compliance flows, subscription brands with behavioral activation milestones.

Pricing: $100/mo (Essentials, up to 5,000 profiles); $1,000/mo (Premium); custom enterprise pricing.

Channels: Email, SMS, push notifications, in-app messages, webhooks.

What Customer.io does best: Event-driven flexibility. While Klaviyo thinks in terms of ecommerce events (placed order, viewed product, started checkout), Customer.io thinks in terms of ANY event. User completed an assessment? Trigger a flow. User's health score dropped below a threshold? Send a re-engagement push. User reached Day 7 without activating a core feature? Branch into an alternative onboarding path. This flexibility is unmatched.

Customer.io also excels at data infrastructure. Its integration with tools like Segment, Mixpanel, and Amplitude means it can ingest rich behavioral data from your product and use it for segmentation and triggering — without requiring a separate CDP.

Key limitation: No native Shopify integration and a steeper learning curve than Klaviyo. If your primary need is ecommerce email marketing, Customer.io will feel over-engineered. For the right use case, though, it's extraordinarily powerful. Propel is one of the top certified Customer.io partners — we've implemented it across 50+ B2C brands.

3. Klaviyo — Best for DTC Ecommerce

Klaviyo is the default choice for DTC ecommerce and for good reason: it was purpose-built for the Shopify ecosystem, and it shows in every feature.

Ideal customer: Shopify-based DTC brands from startup to $50M+.

Pricing: Free up to 250 contacts; $20/mo for 251–500; scales with list size (100K contacts ≈ $1,000/mo).

Channels: Email, SMS.

What Klaviyo does best: Ecommerce-native segmentation and automation. Out of the box, Klaviyo understands purchase history, browsing behavior, cart activity, and product catalog data — and it provides pre-built flows (cart abandonment, browse abandonment, post-purchase, win-back) that work immediately. Its predictive analytics — expected date of next order, predicted CLV, churn risk — are native features, not add-ons.

Klaviyo's biggest strength is accessibility: a non-technical marketer can build sophisticated, behavior-driven email flows in hours, not weeks. The platform's Shopify integration is real-time and bidirectional, meaning your email segments always reflect the latest customer data.

Key limitation: Klaviyo is an email-and-SMS platform, not a full CEP. It doesn't offer push notifications, in-app messaging, or content cards. For brands that need cross-channel orchestration beyond email and SMS, Klaviyo will need to be supplemented. Propel has deep expertise as Klaviyo partners — see our implementation guide.

For a detailed comparison of Klaviyo's capabilities against specific competitors, see our top 10 email marketing platforms for DTC ranking.

4. Iterable — Best for Multi-Channel B2C

Iterable sits in the sweet spot between Klaviyo's DTC focus and Braze's enterprise scale — offering genuine multi-channel capabilities at a more accessible price point.

Ideal customer: Mid-market B2C brands ($5M–$50M) needing multi-channel engagement without Braze's price tag.

Pricing: Custom, typically $30K–$100K/year.

Channels: Email, SMS, push notifications, in-app messaging, web push.

What Iterable does best: Workflow building. Iterable's visual workflow builder is genuinely the most intuitive among enterprise-grade platforms. Marketers can build complex, multi-channel journeys with branching logic, A/B testing, and frequency capping — all without engineering support. The drag-and-drop interface makes it possible to prototype and launch a new flow in hours.

Iterable also strong on AI: its Send Time Optimization and Channel Optimization features automatically determine the best channel and time for each individual user, based on their engagement history.

Key limitation: Smaller market share means fewer agencies and consultants with deep Iterable expertise. You'll have a harder time finding implementation partners compared to Braze or Klaviyo.

5. MoEngage — Best for Consumer Apps (Global)

MoEngage has emerged as the go-to CEP for consumer apps with global audiences, particularly in Asia, Middle East, and emerging markets.

Ideal customer: Consumer mobile apps with 1M+ users, especially those with significant audience outside North America.

Pricing: Tiered from $999/mo (Grow) to custom enterprise.

Channels: Email, SMS, push notifications, in-app messaging, web push, WhatsApp, on-site messaging.

What MoEngage does best: Mobile-first engagement with global channel support. MoEngage was built for mobile apps, and it shows: its push notification capabilities, in-app messaging, and mobile analytics are first-class. The platform also supports WhatsApp natively — critical for brands operating in India, Southeast Asia, Middle East, and Latin America where WhatsApp is the dominant messaging channel.

MoEngage's AI-powered analytics (called Sherpa) provides predictive segmentation, optimal send-time detection, and intelligent path optimization. For consumer apps needing to engage millions of users across diverse geographies, MoEngage delivers. See our list of MoEngage partners for implementation support.

Key limitation: Less established in North America. If your brand is US-only and primarily needs email + SMS, MoEngage's strengths won't be fully utilized.

6. CleverTap — Best for Mobile-First B2C

CleverTap competes directly with MoEngage in the mobile-first CEP space, with a particular strength in real-time user analytics and behavioral segmentation.

Ideal customer: Mobile-first B2C brands — gaming, fintech, food delivery, media streaming — with complex in-app engagement needs.

Pricing: Tiered, starting at approximately $75/mo (Essentials) to custom enterprise.

Channels: Email, SMS, push, in-app, WhatsApp, RCS, web push.

What CleverTap does best: Real-time behavioral analytics combined with engagement. CleverTap doesn't just send messages — it provides a real-time analytics layer that shows exactly what users are doing in your app, identifies behavioral cohorts, and triggers engagement based on real-time actions. Its RFM (Recency, Frequency, Monetary) analysis segments users automatically into retention categories.

CleverTap also pioneered "Clever Campaigns" — pre-built engagement strategies based on behavioral triggers that can be activated with minimal configuration.

Key limitation: Like MoEngage, CleverTap's strongest market presence is outside the US. North American brands may find fewer case studies and integration partners. The email capabilities, while adequate, don't match the depth of platforms like Klaviyo or Customer.io.

7. OneSignal — Best for Push-First Engagement

OneSignal is the most accessible entry point for brands that want to add push notifications to their engagement stack without committing to a full enterprise CEP.

Ideal customer: Brands and apps that need reliable, affordable push notifications as their primary engagement channel, with growing email/SMS needs.

Pricing: Free (up to 10K subscribers); Growth at $9/mo; Professional at $99/mo; custom enterprise.

Channels: Web push, mobile push, in-app messaging, email, SMS.

What OneSignal does best: Push notification infrastructure at unbeatable pricing. OneSignal powers push notifications for over 1 million apps, handling billions of notifications daily. The free tier is genuinely generous, and the paid tiers are a fraction of the cost of enterprise CEPs. Setup takes minutes, not months.

Key limitation: OneSignal's email and SMS capabilities are relatively new and significantly less mature than dedicated platforms. It's best thought of as a push-first platform that's expanding into other channels, rather than a comprehensive CEP.

How to Choose the Right CEP for Your B2C Business

The right CEP depends on answering four questions:

1. What's your primary business model? DTC ecommerce brands should default to Klaviyo. Subscription and membership brands with complex onboarding should consider Customer.io. Consumer mobile apps should evaluate MoEngage, CleverTap, or Iterable.

2. What channels do you need? If email and SMS are sufficient, Klaviyo wins on depth. If you need push notifications, in-app messaging, and web push alongside email, you need Braze, Iterable, MoEngage, or CleverTap.

3. What's your budget? Under $500/month → Klaviyo or OneSignal. $500–$3,000/month → Customer.io or MoEngage. $3,000+/month → Iterable or Braze. These ranges are approximate — actual pricing varies based on contacts, MAU, and channels used.

4. Where will you be in 18 months? This is the most important question. Switching CEPs is a 3–6 month project with real revenue risk. Choose based on where your business is heading, not where it is today. If you're a $5M DTC brand growing 50% YoY, don't choose a platform you'll outgrow in a year.

For a deeper dive into the tools needed for omnichannel marketing automation and how CEPs fit into a broader customer engagement stack, see our dedicated guides.

What We Recommend at Propel

After 200+ implementations across these platforms, here's our honest take:

For DTC ecommerce (Shopify): Klaviyo, 9 times out of 10. The ecommerce-native functionality and Shopify integration depth mean faster time-to-value and less technical lift.

For high-growth B2C apps: Customer.io. The event-driven architecture handles complexity that other platforms struggle with, and the pricing is fair for what you get.

For enterprise B2C: Braze. If you can afford it and have the engineering resources, Braze's real-time capabilities and channel breadth are genuinely best-in-class.

For healthcare and regulated industries: Customer.io with HIPAA BAA, or Braze for enterprise healthcare. Both offer the compliance infrastructure and data handling that regulated industries require.

Not sure which platform is right for your brand? Book a free strategy call with Propel → — we'll assess your tech stack, user journey, and growth trajectory to recommend the right platform.

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FAQs

What is the best customer engagement platform in 2026?

There's no single "best" CEP — it depends on your use case. Braze is best for enterprise B2C, Klaviyo is best for DTC ecommerce, and Customer.io is best for data-driven B2C brands with complex journeys. The right platform matches your business model, channel needs, data complexity, and budget.

What is the difference between Braze and Klaviyo?

Braze is a full-stack customer engagement platform offering email, SMS, push, in-app, web, and content cards with real-time orchestration — priced at $50K+/year for enterprise B2C. Klaviyo is an email-and-SMS marketing platform purpose-built for DTC ecommerce, starting at $20/month. Choose Braze if you need multi-channel orchestration at scale; choose Klaviyo if your primary needs are ecommerce email and SMS.

Which CEP is best for DTC ecommerce brands?

Klaviyo is the best CEP for DTC ecommerce brands in 2026. Its native Shopify integration, ecommerce-specific segmentation, pre-built automation flows, and predictive analytics are purpose-built for the DTC use case. For enterprise DTC brands needing channels beyond email and SMS, Braze and Iterable are strong alternatives.

Is Customer.io good for B2C companies?

Yes, Customer.io is excellent for B2C companies — specifically those with complex user journeys that go beyond simple ecommerce. Healthtech, fintech, subscription, and membership brands with multi-step onboarding, behavioral triggers, and rich user data benefit most from Customer.io's event-driven architecture. It's not the best choice for simple Shopify stores.

How much do customer engagement platforms cost?

Pricing varies enormously. Klaviyo starts at $20/month for small lists. Customer.io starts at $100/month. MoEngage and CleverTap start around $75–$999/month depending on the tier. Iterable typically starts at $30K/year, and Braze at $50K+/year. The biggest cost drivers are monthly active users (MAU), number of channels used, and data processing volume.

What should I look for when choosing a customer engagement platform?

Focus on five factors: (1) channel coverage — does it support the channels your customers use? (2) data capabilities — can it ingest and act on your behavioral data? (3) ease of use — can your team actually build flows without engineering? (4) integration depth — does it connect with your existing tools (Shopify, Segment, analytics)? (5) scalability — will it grow with your business for the next 2–3 years? Don't over-index on features you won't use in the first 12 months.