Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 ActiveCampaignMarketing automation for any business | ReviewsNone yetWrite one for ActiveCampaign | Lowest paid plan$15per month for 1,000 contacts, billed yearlyStarter, as of October 20, 2026 | Free planNot confirmed | Free trial14 days | Public APIYes | Runs onNot confirmed | Main features
|
 AWeberAn email marketing platform that helps small businesses grow their audience and boost sales. | ReviewsNone yetWrite one for AWeber | Lowest paid plan$30Plus, as of October 28, 2026 | Free planYes | Free trial14 days | Public APIYes | ||
 beehiivCreate, grow, and monetize your newsletter with easy-to-use newsletter tools | ReviewsNone yetWrite one for beehiiv | Lowest paid planSee plans | Free planYes | Free trialYes | Public APIYes | ||
 BrevoOne AI-powered customer platform for all your marketing and sales needs | ReviewsNone yetWrite one for Brevo | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 ButtondownNewsletter software for people like you | ReviewsNone yetWrite one for Buttondown | Lowest paid planNot confirmed | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features |
 Elastic EmailEmail API and SMTP for scalable email infrastructure | ReviewsNone yetWrite one for Elastic Email | Lowest paid plan$19per month for up to 50,000 emailsStarter, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 FlodeskEmail marketing with uncompromising design and robust deliverability. | ReviewsNone yetWrite one for Flodesk | Lowest paid plan$25Lite, as of October 28, 2026 | Free planYes | Free trialYes | Public APIYes | ||
 GetResponseAI-powered email, automation, and SMS that grow repeat revenue. | ReviewsNone yetWrite one for GetResponse | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 GMassGMass sends your newsletters, announcements, cold email campaigns, and transactional email from inside Gmail. | ReviewsNone yetWrite one for GMass | Lowest paid planNot confirmed | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onChrome, Gmail | Main features |
 IterableAn AI customer engagement platform for real-time, personalized experiences across every channel. | ReviewsNone yetWrite one for Iterable | Lowest paid planNot confirmed | Free planNot confirmed | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features |
 KitThe email platform for creator business owners, formerly ConvertKit | ReviewsNone yetWrite one for Kit | Lowest paid planSee plans | Free planYes | Free trial14 days | Public APIYes | ||
 KlaviyoAI-first B2C CRM that unifies marketing and service across email, SMS, WhatsApp and more | ReviewsNone yetWrite one for Klaviyo | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 LoopsEmail platform for SaaS teams to send marketing, lifecycle and transactional email from one product | ReviewsNone yetWrite one for Loops | Lowest paid plan$49per month for up to 5,000 subscribed contactsGrowth, as of October 19, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 MailchimpEmail and SMS marketing platform that uses real-time behavior data and AI to convert more customers | ReviewsNone yetWrite one for Mailchimp | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 MailerLiteDigital marketing tools to grow your audience faster and drive revenue smarter | ReviewsNone yetWrite one for MailerLite | Lowest paid plan$10.80per month for 500 subscribers, billed yearlyComfort, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 MailjetEmail marketing software that's built for devs and loved by marketers | ReviewsNone yetWrite one for Mailjet | Lowest paid plan$9per month for 8,000 emailsStarter, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 MailtrapModern email delivery for developer and product teams | ReviewsNone yetWrite one for Mailtrap | Lowest paid plan$15per month for 10,000 emailsBasic, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 MoosendAn email marketing and marketing automation platform. | ReviewsNone yetWrite one for Moosend | Lowest paid planNot confirmed | Free planNot confirmed | Free trial30 days | Public APIYes | Runs onNot confirmed | |
 PlunkTransactional email, marketing campaigns, and automated workflows, all against one contact list | ReviewsNone yetWrite one for Plunk | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APIYes | Runs onSMTP | |
 ResendEmail for developers | ReviewsNone yetWrite one for Resend | Lowest paid plan$20per month for 50,000 emailsPro, as of October 20, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | Runs on | |
 SendGridCreate, send, and manage emails at scale through RESTful APIs or SMTP relay | ReviewsNone yetWrite one for SendGrid | Lowest paid plan$19.95per month, starting price, for 50,000 to 100,000 emailsEssentials, as of October 20, 2026 | Free planNot confirmed | Free trial60 days | Public APIYes |
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a public API. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed