Klaviyo

Mailchimp

Mailchimp is a widely used email marketing platform offering campaigns, automations, landing pages, and audience management, popular with small businesses. It has expanded into a broader marketing suite.

HubSpot

HubSpot is a customer platform combining CRM, marketing automation, sales pipeline management, and customer service tools into a single connected system. It is especially popular with small and mid-size businesses looking to consolidate multiple point solutions into one platform. Marketing Hub provides email campaigns, landing pages, and SEO tools, Sales Hub manages deal pipelines and sequences, and Service Hub handles support tickets and knowledge bases - all sharing the same underlying contact and company records so every team has a unified view of the customer. HubSpot's free CRM tier has been a major growth driver, letting companies start managing contacts and deals at no cost before upgrading to paid Hubs as their marketing, sales, or service needs grow more sophisticated.

ConvertKit

ConvertKit (now Kit) is an email marketing platform designed for creators — writers, YouTubers, podcasters — emphasizing simple automations, tagging, and monetization tools like paid newsletters. It favors plain-text, relationship-driven emails.

Omnisend

Omnisend is an omnichannel marketing automation platform that combines email, SMS, and web push notifications into a single workflow builder for online stores. It integrates directly with platforms like Shopify, WooCommerce, BigCommerce, and Wix, pulling in customer and order data so brands can trigger campaigns like abandoned cart reminders, welcome series, and post-purchase follow-ups without manual list management. The platform is positioned as a lower-cost alternative to larger ecommerce marketing suites, with pricing that scales by contact volume rather than flat enterprise fees. It includes pre-built automation workflows, audience segmentation, form and popup builders, and reporting dashboards, aiming to let small and mid-sized merchants run sophisticated lifecycle marketing without a dedicated marketing ops team.

Customer.io

Customer.io is a marketing automation platform that lets businesses send personalized messages based on user behavior. It supports email, SMS, and push notifications, enabling real‑time engagement across channels. The service provides a visual workflow builder, robust segmentation, and detailed analytics, helping marketers optimize conversion and retention without writing code.

GetResponse

GetResponse is an email marketing and marketing automation platform offering AI-assisted email content generation, drag-and-drop automation workflows, landing pages, popups and forms, and SMS and web push campaigns, plus e-commerce features like abandoned cart recovery. Higher tiers add webinar hosting, a website builder, and paid course and community tools for creators monetizing an audience. Plans scale by contact list size, with Starter, Marketer, and Creator tiers priced from about $19/month at 1,000 contacts and a custom Enterprise tier adding SMS marketing, transactional email, and single sign-on. GetResponse serves a broad mix of entrepreneurs, e-commerce stores, and creators -- the company states it serves more than 350,000 customers across 160+ countries.