Which platform actually drives revenue — and what neither one tells you about your margins.
Key Takeaways
| Criterion | Klaviyo | Attentive |
|---|---|---|
| Primary channel | Email + SMS | SMS-first + Email |
| Starting price | Free (250 contacts); paid from ~$45/mo | Custom; ~$300/mo minimum |
| Shopify integration | Native, real-time | Available, less seamless |
| Segmentation depth | Predictive CLV, churn risk, next purchase date | Behavioral + SMS engagement |
| List-building tools | Standard pop-ups and forms | Best-in-class mobile sign-up units |
| Two-way messaging | Basic SMS replies | AI Concierge for conversations |
| Compliance tooling | Standard TCPA/GDPR controls | Enterprise-grade compliance suite |
| Self-serve onboarding | Yes | Sales-assisted |
| Best for | Brands under $20M GMV wanting one tool | Brands over $20M with $10K+/mo SMS budget |
Klaviyo: Overview
Klaviyo launched in 2012 and has become the dominant email marketing platform in eCommerce. As of 2026, it serves more than 130,000 businesses and processed over $15 billion in attributed revenue for its customers in prior years. The platform is built around a customer data layer that pulls real-time behavioral and transactional data from Shopify, WooCommerce, BigCommerce, and other integrations to power segmentation and automated flows.
The product covers email, SMS, push notifications, and in-app messaging under a single subscription. Its segmentation engine uses predictive analytics to calculate customer lifetime value, churn probability, and predicted next purchase date — signals that more basic platforms simply do not surface.
Klaviyo Pricing
Klaviyo's pricing is contact-based. The free plan covers up to 250 contacts and 500 email sends per month. Paid plans start at approximately $45 per month for 500 active profiles. A store with 10,000 contacts pays roughly $175 per month for email and SMS combined. Pricing scales linearly with list size, and all features are available across tiers — Klaviyo does not lock advanced automation behind enterprise plans.
Klaviyo Strengths
- Deep Shopify integration with real-time event syncing and one-click installation
- 60+ pre-built eCommerce flows including abandoned cart, browse abandonment, win-back, and replenishment
- Predictive analytics: customer lifetime value, churn risk score, next purchase date
- K:AI generative content and subject-line suggestions
- Transparent, self-serve pricing that scales predictably
- Unified attribution across email and SMS in a single dashboard
Klaviyo Weaknesses
- SMS list-building tools are functional but not as sophisticated as Attentive's mobile sign-up units
- Two-way SMS conversation support is basic relative to Attentive's AI Concierge
- Large contact lists become expensive; 100,000+ contacts can cost $700+ per month for email alone
- No native margin or profitability reporting — revenue attribution does not connect to cost of goods
Attentive: Overview
Attentive was founded in 2016 with a singular focus on SMS marketing. The platform built its reputation on mobile sign-up unit design, compliance infrastructure, and high subscriber opt-in rates. Over time it added email capabilities, but SMS remains the product's core identity and competitive moat.
Attentive's AI Concierge feature enables two-way conversational SMS at scale — a meaningful differentiator for brands that use text messaging as a customer service and repurchase channel. The platform also supports RCS (Rich Communication Services) messaging, which allows brands to send image-rich, interactive messages on Android devices without requiring a separate app.
Attentive Pricing
Attentive does not publish standard pricing. Plans are custom-quoted through a sales process and depend on SMS volume, subscriber count, and contracted message frequency. Entry-level arrangements typically start around $300 per month. Per-message costs run approximately $0.01 per SMS, with additional carrier fees of $0.0025 to $0.0035 per message. High-volume brands spending $10,000 or more per month on SMS typically find Attentive's managed approach cost-effective relative to volume discounts negotiated during contracting.
Attentive Strengths
- Best-in-class mobile sign-up units with documented higher opt-in rates
- Enterprise-grade TCPA and GDPR compliance tooling
- AI Concierge for two-way conversational SMS
- RCS messaging support for richer mobile experiences
- Dedicated customer success management at scale
- Strong performance benchmarks for mid-to-large DTC brands
Attentive Weaknesses
- No self-serve onboarding — requires a sales process and contracts
- Email product is newer and less mature than Klaviyo's
- Higher minimum cost excludes brands in early growth stages
- Running email in a separate tool creates attribution fragmentation
- No margin or profitability data — channel performance is reported in revenue, not gross profit
Side-by-Side Feature Comparison
| Feature | Klaviyo | Attentive |
|---|---|---|
| Email marketing | Full-featured, primary product | Available, secondary to SMS |
| SMS marketing | Available, secondary to email | Full-featured, primary product |
| Push notifications | Yes | No |
| Pop-up / sign-up forms | Standard templates | Premium mobile-optimized units |
| Automation flows | 60+ pre-built eCommerce flows | SMS-focused flows, fewer email flows |
| A/B testing | Email and SMS | SMS; limited email testing |
| Predictive analytics | CLV, churn risk, next purchase date | Basic behavioral segmentation |
| Two-way SMS | Basic reply handling | AI Concierge for conversations |
| RCS messaging | No | Yes |
| Shopify native | Yes, real-time sync | Yes, requires more configuration |
| Revenue attribution | Cross-channel, unified | SMS-attributed revenue |
| Margin reporting | No | No |
| Free plan | Yes (250 contacts) | No |
| Contract required | No | Yes |
Use Case Recommendations
Choose Klaviyo if:
- You are building or scaling an eCommerce brand and want one platform for email and SMS
- Your annual GMV is under $20 million and budget flexibility matters
- You are on Shopify and want the deepest possible native integration
- You need predictive analytics to identify at-risk customers without a data team
- You want to start free and scale pricing with growth
Choose Attentive if:
- SMS is your primary revenue driver and you spend $10,000 or more per month on text messaging
- Your brand is above $20 million in GMV with a dedicated growth or CRM team
- You need enterprise-grade TCPA compliance tooling and a managed onboarding process
- Two-way conversational SMS and RCS messaging are strategic priorities
- You are willing to run a separate email platform to get best-in-class SMS performance
The Operating Intelligence Gap
Both Klaviyo and Attentive do something well: they help you send messages and attribute revenue to those messages. What neither platform does is connect that attributed revenue to what it actually cost to generate it.
When a Klaviyo flow drives $80,000 in sales for a month, the dashboard shows $80,000. It does not show you the cost of goods sold for those orders, the contribution margin after discounts, the fulfillment cost per unit, or whether the cohort of customers acquired through that campaign has a repeat purchase rate that justifies the acquisition cost. The number looks good. Whether it is good — that requires a different system.
This is the gap that Fairview fills. Fairview is an Operating Intelligence Platform designed for COOs, operators, and founders managing revenue operations. It connects your marketing channel data — including Klaviyo and Attentive sends, opens, clicks, and attributed revenue — to your unit economics: cost of goods, fulfillment costs, return rates, and gross margin by cohort and channel.
The output is not another dashboard with more colored charts. It is a clear answer to the questions that marketing platforms cannot answer: Which channel is profitable at the margin level? Which customer segments are worth retaining versus letting churn? Where is revenue growth masking margin compression?
Fairview sits above your marketing stack, not inside it. It does not replace Klaviyo or Attentive — it makes both tools more legible by translating their outputs into operating decisions. Starter plan begins at $149 per month.
See Your Marketing Margin, Not Just Revenue
Fairview connects Klaviyo and Attentive attribution to your actual gross margin — so you know which campaigns are making money, not just driving clicks.
Explore Fairview →Verdict
For the majority of eCommerce operators in 2026, Klaviyo is the default correct choice. It handles email and SMS in one platform, integrates natively with Shopify, offers predictive analytics that most brands do not fully use even after years on the platform, and starts free. The incremental performance difference between Klaviyo SMS and Attentive does not justify the additional cost and complexity for brands under $20 million in revenue.
Attentive earns its position at the high end of the market. If SMS is a strategic channel with a dedicated budget and team behind it, Attentive's list-building tools, compliance infrastructure, and conversational AI deliver measurable performance advantages over Klaviyo's SMS product. The trade-off is cost, complexity, and the need to run a second platform for email.
The decision, in most cases, is not Klaviyo or Attentive. It is Klaviyo now, and Attentive later if SMS volume and team resources justify the upgrade. The missing piece in both scenarios is an operating layer that tells you whether the revenue those messages drive is actually profitable.