ESP Platforms
Market Tiers
<50K contacts
$0-50/mo
50K-500K contacts
$30-500/mo
500K+ contacts
$1K+/mo (custom)
Specific use cases
Variable pricing
SMB Platforms (<50,000 contacts)
Emphasis on ease of use, affordability, and simplicity. Ideal for solo entrepreneurs and small local businesses.
| Platform | Contacts | Pricing | Best For |
|---|---|---|---|
| Mailchimp | <50K | $0-50/mo | Basic campaigns, simplicity |
| MailerLite | <50K | $0-50/mo | Solo entrepreneurs |
| Constant Contact | <50K | $0-50/mo | Small local businesses |
| Sendinblue (Brevo) | <50K | $0-50/mo | Affordability |
Mid-Market Platforms
Mid-Market Platforms (50K-500K contacts)
Emphasis on automation, segmentation, and revenue-focused features. For growing e-commerce, B2B SaaS, and professional services.
| Platform | Contacts | Pricing | Best For |
|---|---|---|---|
| Klaviyo | 50K-500K | $150-2K/mo | E-commerce (Shopify) |
| ActiveCampaign | 50K-500K | $30-500/mo | B2B with CRM needs |
| Drip | 50K-500K | $30-500/mo | Non-Shopify e-commerce |
| Omnisend | 50K-500K | $30-500/mo | SMS + Email combo |
| Kit (ConvertKit) | Up to 500K | $0-279/mo | Creator economy |
| HubSpot Marketing Hub | Varies by plan | $0-3,600/mo | CRM-integrated marketing |
Enterprise & Specialist Platforms
Enterprise Platforms (500K+ contacts)
Emphasis on scale, customization, AI-driven personalization, and cross-channel orchestration.
| Platform | Pricing | Best For |
|---|---|---|
| Braze | $5K-17K/mo | Real-time personalization at scale |
| Iterable | Custom | Growth experimentation |
| Salesforce Marketing Cloud | Custom | Enterprise CRM integration |
Specialist & Niche Platforms
Deep specialization for specific use cases: newsletter monetization, transactional reliability, event-driven messaging.
| Platform | Type | Pricing | Unique Feature |
|---|---|---|---|
| beehiiv | Newsletter | $0-109/mo | Native ad network + Boosts |
| SendGrid | Transactional | Volume-based | ~95% delivery in independent testing |
| Postmark | Transactional | Premium | 98-99% public delivery rates |
| Customer.io | Event-Driven | Custom | Real-time event triggers |
Comparison & Selection Framework
Platform Comparison Summary
Quick reference for strengths and limitations of major platforms.
Klaviyo
Strengths
- Deep Shopify integration
- Revenue per email visible
- Product recommendations
- Abandoned cart flows
Limitations
- Expensive at scale
- Pricing unpredictability
- Steep learning curve for non-e-commerce
ActiveCampaign
Strengths
- Email + CRM unified
- Sales pipeline management
- Multi-channel messaging
- Lead scoring triggers
Limitations
- Less e-commerce specialized
- Broader but less retail-specific
- Worse for high-volume e-commerce
Omnisend
Strengths
- Native SMS delivery
- Unified email + SMS workflows
- Predictable SMS costs
- Good under 2.5K contacts
Limitations
- No product recommendations
- SMS costs higher than Attentive
- Less specialized than Klaviyo
Braze
Strengths
- Real-time stream processing
- Cross-channel orchestration
- Advanced behavioral segmentation
- No overage charges
Limitations
- $60K/year minimum
- Requires dedicated resources
- Steeper learning curve
ESP Selection Framework
E-Commerce (Shopify)
Klaviyo
Revenue attribution, product recommendations
B2B / Long Sales Cycles
ActiveCampaign
CRM integration, lead scoring
SMS + Email Combined
Omnisend
Native SMS, unified workflows
Newsletter Monetization
beehiiv
Native ads, Boosts, paid subscriptions
Enterprise Real-Time
Braze
Stream processing, cross-channel
Growth Experimentation
Iterable
A/B testing, AI optimization
Non-Shopify E-Commerce
Drip
WooCommerce, BigCommerce
Creator / Course Seller
Kit
Digital products, creator tools
Full CRM + Marketing
HubSpot
Unified sales + marketing platform