10 Best Email Marketing Software for Small Businesses in the US (2026)

Constant Contact, headquartered in Waltham, Massachusetts and backed by private equity firm Clearlake since 2021, is built for owners who want help from a person: live phone and chat support comes with every plan. Beyond email it handles social posting, event registration and payments, and SMS for US customers. There is no free plan, only a 30-day trial with up to 100 sends; Lite starts at $12 a month ($10.20 prepaid annually) but allows one user and one automation template. In June 2025 it bought the email platform Moosend. Best for: local businesses and nonprofits that value live support and event tools over the lowest price.

Klaviyo, the Boston company founded in 2012 and listed on the NYSE since 2023, is the default choice for online stores: it syncs orders, products and customers from Shopify in real time, so you can segment and trigger emails by what people bought or browsed. The free plan covers 250 active profiles and 500 emails a month; the Email plan costs $20 a month for 500 profiles and 5,000 emails, and SMS is billed by usage. Since 2025 your plan must cover every active profile and upgrades automatically as your list grows. In June 2026 it rolled out AI agents for marketing and customer service. Best for: e-commerce brands, especially on Shopify, that market from their sales data.

Brevo, the Paris company known as Sendinblue until 2023, combines email, SMS, WhatsApp, transactional email and a built-in sales CRM, with plans sized by how many emails you send each month. The free plan stores up to 100,000 contacts but sends only 300 emails a day, with Brevo branding. Starter costs $9 a month for 5,000 emails, though at that tier you can keep only 500 contacts, and removing the logo costs $12 a month extra. In December 2025 it raised €500 million (about $583 million) and said it would invest more than €100 million in the US. Best for: budget-minded businesses that also need SMS or transactional email from one account.

MailerLite, launched in 2010 and part of Warsaw-listed Vercom since 2022, pairs a clean editor with visual automations, e-commerce triggers for Shopify and WooCommerce, and a built-in website and landing-page builder. Its free plan has been cut twice and now covers 250 subscribers and 2,500 emails a month. Comfort, the entry paid plan since a June 2026 overhaul, costs $12 a month ($10.80 billed annually) for 500 subscribers and 5,000 emails and includes an AI writing assistant; live chat support is reserved for the top Power plan. Best for: solopreneurs and small businesses on a budget that want newsletters, automations and a simple website in one tool.

Kit, the independent company Nathan Barry founded in 2013 and called ConvertKit until 2024, is built for creators who run their business through a newsletter. Its free plan goes further than most — up to 10,000 subscribers with unlimited broadcasts, forms and landing pages — but includes no automations or email sequences. Creator, at $39 a month ($33 billed yearly) for 1,000 subscribers, unlocks unlimited automations and SMS, and lets you sell digital products and paid newsletters for a 3.5% + 30¢ fee per sale. In 2025 Kit raised its prices for the first time. Best for: coaches, authors and course sellers who grow a business around a newsletter.

HubSpot, the Massachusetts-based CRM company (NYSE: HUBS) founded in 2006, keeps its email tools in the same account as its free CRM, so every campaign is tied to each contact’s sales history. The free tier covers up to 1,000 contacts and 2,000 emails a month with HubSpot branding. Starter lists at $20 per seat a month (new customers are currently offered it from $7), removes the branding and lets you send up to five times your contact tier each month. The step up to Professional — about $800 a month plus a one-time $3,000 onboarding fee — is steep. Best for: small teams that want marketing email and their CRM in one system.

ActiveCampaign, a privately held Chicago company founded in 2003, is the automation specialist on this list: every plan includes its multi-step automation builder, 950+ ready-made recipes and Shopify, Square and WooCommerce integrations with abandoned-cart flows. There is no free plan, only a 14-day trial. Starter costs $15 a month billed annually ($19 monthly) for 1,000 contacts, but it limits each automation to five actions and leaves out landing pages; SMS and WhatsApp start on the Plus plan at $49 a month. In February 2026 it introduced a 30-day results guarantee for new customers who sign up directly. Best for: businesses that need behavior-based automation, not just a monthly newsletter.

Omnisend, founded in Lithuania in 2014 and built for online stores, connects to Shopify, BigCommerce, WooCommerce and Wix and includes ready-made cart-abandonment, welcome and post-purchase workflows on every plan. The free plan covers 250 contacts and 500 emails a month; Standard starts at $16 a month for 500 contacts and $20 at 1,000. Since May 2026, text messaging requires the Pro plan, from $59 a month. In May 2026 it also launched an integration that lets merchants work with Omnisend from inside ChatGPT. Best for: small online stores that want ready-made e-commerce automation on a tighter budget.

GetResponse, founded in Poland in 1998, is one of the few tools here with unlimited sends on every paid plan. Its free account covers 500 contacts and 2,500 emails a month, with a GetResponse badge and no automated emails after the 14-day trial. Starter costs $19 a month ($15.58 billed annually) for 1,000 contacts and includes landing pages and sign-up forms, but only one automation workflow; the Creator plan, from $69 a month, adds webinars, a course builder and a website builder. Best for: businesses that email often or sell through webinars and online courses.