While Klaviyo dominates ecommerce email marketing, B2B SaaS companies need behavior-based automation, CRM integration, and lifecycle marketing built for software—not shopping carts. From enterprise powerhouses like HubSpot to purpose-built B2B specialists like Encharge, these seven alternatives deliver superior value for Series A+ companies seeking sophisticated marketing automation without paying for ecommerce features they'll never use. This comprehensive analysis examines each platform's strengths, pricing models, and ideal use cases to help B2B SaaS teams make informed decisions beyond the Klaviyo ecosystem.

Key Takeaways

• Pricing models dramatically impact total cost: Klaviyo's contact-based pricing penalizes large databases, while alternatives like Brevo offer send-volume pricing that can significantly reduce costs for SaaS companies with large but low-frequency email lists

• B2B SaaS-specific platforms outperform adapted ecommerce tools: Purpose-built solutions like Encharge deliver 4.7/5 G2 ratings through specialized workflows for trial conversion, onboarding, and expansion revenue—use cases Klaviyo wasn't designed to handle

• Automation depth determines lifecycle marketing success: ActiveCampaign's hundreds of pre-built workflows and multi-branch logic enable sophisticated nurture sequences that drive measurable pipeline acceleration

• CRM integration eliminates operational friction: Platforms with native CRM capabilities like HubSpot reduce tool sprawl and maintenance overhead, critical for lean Series A marketing teams managing multiple priorities

• Implementation complexity varies significantly: While Klaviyo requires ecommerce integration expertise, alternatives like MailerLite deliver 1-2 week setup with beginner-friendly interfaces that don't sacrifice capability

The B2B email marketing landscape has shifted decisively toward behavior-based automation and product-led growth workflows in 2025. While Klaviyo maintains strong positioning in ecommerce with solid G2 ratings, seven alternatives stand out for their superior fit with B2B SaaS requirements.

B2B companies increasingly prioritize behavior tracking, lifecycle automation, and CRM integration over ecommerce-specific features that define Klaviyo's core value proposition.

1. ActiveCampaign — Advanced Automation with Built-in CRM

ActiveCampaign emerges as the most comprehensive Klaviyo alternative in 2025, combining enterprise-grade automation with an integrated CRM that eliminates the need for separate sales tools.

Key Features:

• hundreds of pre-built workflows with multi-branch logic

• Built-in sales CRM with pipeline management

• Predictive sending powered by machine learning

• 900+ integrations

• Two-year price lock guarantee

• Site tracking and lead scoring

Pricing Structure:

• Free: $0 (14-day trial with email sign-up)

• Starter: Starts at $15/month (10x contact limit)

• Plus: Starts at $49/month (10x contact limit)

• Pro: Starts at $79/month (12x contact limit)

• Enterprise: Starts at $145/month (15x contact limit)

The platform's automation depth proves invaluable for companies implementing go-to-market architecture that requires sophisticated multi-step nurture sequences. According to market analysis, ActiveCampaign serves 185,000+ businesses with a 4.5/5 G2 rating from 14,400+ reviews, with users consistently praising the automation builder's flexibility.

For B2B SaaS teams, ActiveCampaign delivers more affordable entry pricing compared to Klaviyo while providing better B2B capabilities. The platform's AI-powered workflows enable sophisticated automation without requiring technical expertise.

2. Encharge — Purpose-Built for B2B SaaS Workflows

Encharge positions itself as a marketing automation platform built exclusively for B2B SaaS companies, delivering the highest user satisfaction among all alternatives reviewed.

Standout Capabilities:

• Visual flow builder for behavior-based automation

• Native Stripe, HubSpot, and Salesforce integrations

• User segmentation based on product usage events

• Trial-to-paid conversion workflows

• Feature adoption tracking

• Expansion revenue automation

Pricing Structure:

• Growth: $99/month (up to 2,000 subscribers, billed monthly)

• Premium: $159/month (up to 2,000 subscribers, adds advanced features and higher limits)

• Enterprise: custom pricing (for 50,000+ subscribers and dedicated account management)

Implementation benefits from Encharge's laser focus on B2B SaaS use cases—not adapted from ecommerce like Klaviyo. The investment aligns with product-led growth strategies, particularly for companies focused on trial conversion and user activation.

Encharge maintains a 4.7/5 G2 rating from 350+ reviews—the highest among all alternatives—with users praising its Stripe integration as voted #1 for Stripe accounts. For Series A+ SaaS companies, the B2B-specific focus eliminates wasted features and accelerates time-to-value.

3. HubSpot Marketing Hub — All-in-One Platform with Free CRM

For organizations seeking a unified platform that scales from startup to enterprise, HubSpot Marketing Hub presents a premium alternative with its industry-leading ecosystem and free CRM foundation.

Core Strengths:

• Native CRM included free forever

• Landing pages, forms, and ad management included

• Account-based marketing tools

• Lead scoring and pipeline management

• Bi-directional sync with sales and service hubs

• Extensive app marketplace

Pricing Structure:

• Free Tools: $0/month (core CRM + basic marketing tools)

• Marketing Hub Starter: $20/month (entry-level marketing features; pricing based on a small contact tier, billed annually)

• Marketing Hub Professional: $890/month (advanced automation & multi-channel campaigns; includes a larger contact bundle)

• Marketing Hub Enterprise: $3,600/month (enterprise-grade features and higher contact limits, billed annually)

The platform's unified approach eliminates the integration complexity that plagues multi-tool stacks. Genesys Growth's HubSpot guide details implementation best practices that maximize ROI from the platform's comprehensive capabilities.

HubSpot serves over 205,000 customers in more than 135 countries with a 4.5/5 G2 rating from 14,200+ reviews. While more expensive at scale, the unified platform reduces tool sprawl—critical for PLG metrics dashboards requiring clean data across marketing, sales, and customer success.

4. Customer.io — Behavioral Automation for Product-Led Growth

Customer.io emerges as the go-to platform for technical B2B SaaS teams requiring sophisticated event-based automation and in-app messaging capabilities.

Developer-Friendly Features:

• Event-based triggers tracking any user action

• In-app messaging plus push plus email unified

• Generous send limits with profile-based pricing

• Robust API with webhooks and custom data objects

• Multi-channel campaign orchestration

• Real-time behavioral segmentation

Pricing Structure:

• Essentials: from $100/month (up to 5,000 profiles; profile-based pricing, billed monthly)

• Premium: from $1,000/month (higher volumes, more advanced features; billed annually)

• Enterprise: custom pricing (for large-scale usage and advanced compliance / support needs)

Customer.io targets technically sophisticated teams needing advanced data-driven marketing automation. The platform excels in flexible, unlimited segmentation conditions and omnichannel campaigns.

Serving more than 8,400 companies including Netlify and GitHub, Customer.io delivers a 4.4/5 G2 rating from 650+ reviews. For companies implementing demand generation acceleration, the ability to combine in-app messages with email creates powerful onboarding and activation sequences.

5. Brevo (formerly Sendinblue) — Best Value with Send-Volume Pricing

Brevo represents the most cost-effective full-featured alternative, offering send-volume pricing that eliminates the contact-based penalty that makes Klaviyo expensive for large databases.

Budget-Friendly Stack:

• Send-volume pricing—pay per email, not contacts

• Unlimited contacts on free plan (300 emails/day)

• Built-in transactional email (SMTP/API)

• High email deliverability

• Multichannel: email, SMS, WhatsApp, live chat

• Basic CRM functionality included

Pricing Structure:

• Free: $0 (unlimited contacts, 300 emails/day)

• Starter: $9/month (5,000 emails)

• Business: $18/month (5,000 emails + advanced features)

• Enterprise: Custom pricing

According to Email Vendor Selection, "Brevo is the best alternative to Klaviyo for anyone who wants free email marketing." The platform serves 700,000+ customers worldwide with a 4.5/5 G2 rating.

For Series A companies exploring marketing tools, Brevo's pricing model is ideal for SaaS companies with large databases but lower email frequency—product updates, feature announcements, and monthly newsletters.

6. Omnisend — Omnichannel Marketing with Superior Support

Omnisend revolutionizes multi-channel engagement with native SMS, web push, and email capabilities unified in a single platform with industry-leading customer support.

Omnichannel Excellence:

• 350+ email templates

• Customer Lifecycle Mapping visualization

• 24/7 live chat on all plans

• Pre-built automation workflows

• SMS and web push notifications

• 4-minute average response

Pricing Structure:

• Free: $0/month (300 emails/day, large contact storage, 1 user)

• Starter: from $9/month (removes daily send cap; higher monthly email limits)

• Standard: from $18/month (adds advanced automation, A/B testing, better reporting)

• Professional: from $499/month (for high-volume, data-driven campaigns and larger teams)

• Enterprise: Custom pricing (unlimited users and advanced enterprise features)

The platform delivers what Email Vendor Selection calls the "best alternative to Klaviyo for ecommerce businesses" while offering value for B2B SaaS with product-led growth models. Omnisend serves 125,000+ brands with a 4.5/5 G2 rating from 1,100+ reviews.

With entry-level pricing at roughly one-third of Klaviyo's for comparable features, Omnisend presents compelling value for companies that need multi-channel engagement without complexity. The platform's support quality particularly benefits lean marketing teams without dedicated technical resources.

7. MailerLite — Simplicity and Deliverability for Lean Teams

MailerLite represents the focused alternative for teams requiring exceptional email deliverability without the complexity of full automation platforms.

Simplicity-First Features:

• Unlimited emails on all paid plans

• Best-in-class deliverability via MailerSend infrastructure

• Built-in website builder with hosting

• 500 contacts + 12,000 emails/month free

• Beginner-friendly drag-and-drop editor

• High deliverability rates across all plans

Pricing Structure:

• Free: $0/month (up to 500 subscribers, 12,000 emails/month, 1 user; core email, automations, 1 website, and up to 10 landing pages)

• Growing Business: from $10/month (adds more advanced email features, additional automations, ability to remove MailerLite logo, more sites/landing pages; price scales with subscribers)

• Advanced: from $20/month (adds unlimited account users and more advanced site/automation features; price scales with subscribers)

• Enterprise: custom pricing

Email Vendor Selection praises MailerLite as "the best alternative to Klaviyo for simple, reliable, low-cost email marketing." The platform serves 1 million+ users globally with a 4.6/5 G2 rating from 1,070+ reviews.

For early-stage companies that Genesys Growth frequently advises, MailerLite provides reliable email marketing at startup-friendly pricing. When email open rates matter more than advanced automation, MailerLite delivers exceptional inbox placement without complexity.

Choosing the Right Alternative Based on Your Growth Stage

For B2B SaaS companies evaluating alternatives, success depends on matching platform capabilities to organizational maturity and GTM strategy:

Series A (10-50 employees):

• Recommended: Encharge Growth or MailerLite Advanced

• Budget: $79-100/month typical

• Implementation: 1-2 weeks maximum

• Why: B2B SaaS-specific features without enterprise complexity

Series B (50-200 employees):

• Recommended: ActiveCampaign or Customer.io

• Budget: Mid-four figures annually typical

• Implementation: 2-4 weeks with dedicated support

• Why: Advanced automation that scales with team growth

Series C+ (200+ employees):

• Recommended: HubSpot Professional or Customer.io Premium

• Budget: Five figures annually typical for enterprise

• Implementation: 30-60 days with full onboarding

• Why: Unified platform reducing operational overhead

Budget-Conscious Teams:

• Recommended: Brevo or MailerLite

• Budget: $9-18/month to start

• Implementation: Days, not weeks

• Why: Maximum value for limited marketing budgets

For companies seeking expert guidance through platform selection and implementation, Genesys Growth's consulting provides hands-on support with weekly deliverables and embedded execution—accelerating time-to-value while avoiding common pitfalls.

Frequently Asked Questions

What makes a Klaviyo alternative "best" for B2B SaaS in 2025?

The best B2B SaaS alternatives prioritize behavior-based automation over ecommerce triggers, offer native CRM integration, and support lifecycle marketing workflows like trial conversion and expansion revenue. Platforms like Encharge with 4.8/5 G2 ratings earn high marks specifically because they're built for software companies, not adapted from ecommerce. Key evaluation criteria include Stripe integration for subscription businesses, product usage tracking, and user segmentation based on in-app behavior rather than purchase history.

Can free email marketing platforms adequately support a Series A+ B2B SaaS company?

Free tiers from Brevo (unlimited contacts, 300 emails/day) and MailerLite (1,000 contacts, 12,000 emails/month) can support early-stage operations, but Series A companies typically outgrow free limits quickly. The real consideration isn't cost—it's capability. Free plans often lack advanced automation, A/B testing, and CRM integration that product-led growth strategies require.

How does Genesys Growth help B2B SaaS companies choose the right email marketing platform?

Genesys Growth provides hands-on consulting that includes tooling and stack audits to evaluate platforms against your specific GTM requirements. Rather than generic recommendations, the engagement process examines your growth stage, technical resources, existing CRM, and lifecycle marketing needs to recommend platforms that accelerate rather than constrain your marketing operations.

What should I consider when evaluating Klaviyo pricing against other options?

Klaviyo's contact-based pricing can become expensive quickly for B2B SaaS companies with large databases. Compare against Brevo's send-volume pricing, which charges per email sent rather than contacts stored. ActiveCampaign offers a two-year price lock guarantee that prevents surprise increases as your list grows.

Which alternative offers the best ROI for Series A B2B SaaS companies?

For Series A companies with 10-50 employees and limited technical resources, Encharge delivers the strongest ROI through specialized B2B SaaS features and straightforward implementation. At $79/month for the Growth plan, teams gain behavior-based automation, Stripe integration, and lifecycle marketing workflows purpose-built for software companies. MailerLite provides exceptional value at $9/month for teams prioritizing deliverability over advanced automation.

Is "customer engagement software" a broader category than email marketing platforms?

Yes—customer engagement software encompasses email, in-app messaging, SMS, push notifications, and behavioral triggers across the entire customer lifecycle. Platforms like Customer.io and HubSpot qualify as full customer engagement solutions, while tools like MailerLite focus specifically on email. For account-based marketing strategies, the distinction matters: engagement platforms enable multi-channel orchestration that email-only tools cannot provide.