All Email Tools
Every tool covered on this site, with the plan limits and prices each vendor publishes. Figures were read from the vendors' own pages on October 7, 2026; each card links to the vendor's pricing page.
Sequenzy
Email platform for SaaS that connects to Stripe, Paddle and Lemon Squeezy billing events and sends transactional and marketing mail from one account. Its site says a Stripe invoice.payment_failed event starts dunning emails with a card-update page; payment retries themselves stay in Stripe or Paddle.
Resend
Developer-focused email API with webhooks on paid plans. The free plan allows 3,000 emails a month (100 a day, 3 domains); Pro is $20 for 50,000 emails and Scale $90 for 100,000, with extra emails at $0.90 per 1,000.
Postmark
Transactional-first provider that bills by message. Paid plans start at 10,000 emails, and the price of extra emails falls from $1.80 per 1,000 on Basic to $1.30 on Pro and $1.20 on Platform. The free plan is 100 emails a month with no overage allowed.
Customer.io
Behavioral messaging platform with a visual workflow builder across email, push, in-app and WhatsApp. Essentials is billed by profiles, $145 a month at 10,000 profiles and $235 at 20,000, and includes 1M email sends; Premium starts at $1,000 a month billed yearly.
SendGrid
Twilio's email API and SMTP service, with a separate Marketing Campaigns product. The Email API offers a 60-day trial of 100 emails a day, then Essentials from $19.95 for 50,000 to 100,000 emails and Pro from $89.95, which includes a dedicated IP.
Loops
Email platform for SaaS priced by subscribed contacts, with transactional sends included and no per-seat charge. The free plan allows up to 4,000 sends in any 30 days to the 1,000 newest contacts; the Growing Audience plan shows $99 a month at 9,998 subscribers and $249 at 49,989.
Mailgun
Email API and SMTP relay with inbound routing and address validation. Free is 100 emails a day; Basic $15 for 10,000, Foundation $35 for 50,000 and Scale $90 for 100,000. Log retention is one day on Basic, five on Foundation and 30 on Scale.
Userlist
Lifecycle email and in-app messages for B2B SaaS, with segments for both users and companies. Basic is $149 a month for up to 10,000 users plus $10 for each additional 1,000; Professional adds A/B split testing and conversion goals at $349 for the same 10,000 users.
Drip
Marketing automation with ecommerce roots, priced by the number of people on your list with unlimited email sends on most tiers. The slider shows $39 a month for up to 2,500 people, $154 at 10,000 and $369 at 25,000; there is a 14-day trial and no free plan.
Plunk
Open-source (AGPL-3.0) email platform covering transactional email, workflow automation and broadcasts. The free plan allows 1,000 emails a month with Plunk branding; beyond that, pay-as-you-grow billing is $0.001 per email with unlimited contacts and a monthly spend cap.
AWS SES
Pay-per-message sending from AWS at $0.16 per 1,000 emails on its Essentials plan, which its pricing page says is the default for new accounts. It supports SMTP and API sending and inbound processing through Mail Manager; dashboards, suppression handling and templates are for you to assemble.
Encharge
Behavior-based email automation with a visual flow builder, webhooks, and integrations that include Stripe and Chargebee. Growth is $99 a month for up to 2,000 subscribers, and Premium is $159. Premium adds HubSpot and Salesforce integrations and a transactional email API.
Intercom
Customer messaging and support platform in which email is one channel among several. Plans are priced per seat, the Fin AI Agent is billed separately at $0.99 per outcome, and there is a 14-day cardless free trial but no ongoing free plan.
ActiveCampaign
Marketing automation platform with built-in CRM. Starting prices at 1,000 contacts, billed annually, are $15 for Starter, $49 for Plus, $79 for Pro and $145 for Enterprise, and each rises with the size of your contact list.
ConvertKit
Newsletter and creator email platform, now operating as Kit. The free plan covers up to 10,000 subscribers with unlimited broadcasts; visual automations and email sequences start on the paid Creator plan, which is priced by subscriber count.
How this directory is organized
Each card gives the vendor's own description of what it sells, the plan limits that tend to decide a purchase, and the price the vendor lists. The category tag says what kind of product it is, and the pricing unit is the thing that most often surprises buyers, so each group below names it.
- Transactional (Resend, Postmark): products built around messages your application triggers, such as resets and receipts. Both bill by email volume, and both are narrower than a marketing suite.
- Infrastructure (SendGrid, Mailgun, AWS SES): sending services where you assemble more of the surrounding work yourself. Mailgun and SendGrid bill by plan with overage; SES bills per thousand emails.
- All-in-one (Sequenzy, Loops): platforms that send both transactional and lifecycle email. Sequenzy bills by email volume with unlimited contacts and lists Stripe, Paddle and Lemon Squeezy among its billing integrations; Loops bills by subscribed contacts with transactional sends included.
- Marketing automation (Customer.io, Drip, Encharge): behavioral flows aimed at growth teams, billed by profiles, people or subscribers rather than by message.
- Everything else: Userlist (B2B SaaS with company-level segments), Plunk (open source), Intercom (a support suite with email as one channel), ActiveCampaign (CRM plus email) and ConvertKit (newsletters for creators).
Prices shown here
Prices are the figures each vendor published on October 7, 2026, and they use different units, so they are not directly comparable. At roughly 10,000 of something: Loops lists $99 a month at 9,998 subscribers, Customer.io $145 at 10,000 profiles, Drip $154 at 10,000 people and Userlist $149 at 10,000 users. Sequenzy, Resend and Postmark charge by email volume instead: Sequenzy lists $19 for 15,000 emails, Resend $20 for 50,000 and Postmark $15 for 10,000. A list of 10,000 people that you email once a month is a very different bill under those two models. Read how we source and calculate prices before relying on any figure, and confirm on the vendor's page before you buy.
If you are still choosing
The fastest route: pick your use-case guide, read the two or three services it favors, then run finalist matchups from the comparison index. For the trigger-architecture upstream question - how billing events and product events should drive email at all - the Stripe integration guide and the transactional email guide cover the reasoning.
If you find a figure that no longer matches a vendor's page, tell us through the contact page and we will correct every page that repeats it.
Directory FAQ
Why are transactional services listed apart from marketing tools?
They are bought for a different job and priced on a different unit. A password reset has to arrive within moments and is triggered by your application, so these services bill by message and sell logs, webhooks and suppression handling. Marketing tools bill by the size of your list. Many teams use one of each, on separate sending domains, so a campaign problem cannot affect receipts.
Does "all-in-one" mean one bill for everything?
It means one platform, usually one dashboard, but the price still depends on a single unit. Sequenzy bills by emails sent with unlimited contacts, and Loops by subscribed contacts with transactional sends included, so the same product launch can cost very differently on each. Check which meter the vendor counts before you compare totals.
How current are these entries?
The figures here were read from vendors' own pages on October 7, 2026, and the "Updated" date at the top of the page shows when it was last reviewed. Vendors change free plans and prices without notice, which is why each card links straight to the pricing page so you can check the current number.
Need help deciding? Check out the full comparison with detailed breakdowns.
Read Full Comparison