1. Customer.io: AI agent skills on event-driven lifecycle
Does well for this audience: SaaS teams whose lifecycle depends on product events and billing state. The Essentials tier lists AI Agent core skills, a visual workflow builder and email support, so the AI sees the same profiles that trigger each message. The free Startup Program can cover up to 12 months for eligible early-stage companies that have raised under $10M.
Where it falls short: The profile steps rise quickly, from $145 at 10,000 profiles to $235 at 20,000 and $325 at 30,000. Elevated AI Agent limits sit on Premium, which lists $1,000 a month with custom profile volume, so heavy agent use means a conversation with sales.
Price: Essentials from $100 a month. The 10,000-profile step is $145 a month, billed monthly. Read the full plan list on the Customer.io pricing page or in our Customer.io pricing guide.
2. Brevo: low-cost paid automation
Does well for this audience: small teams that want automation without a large commitment. The free plan allows 300 sends a day for up to 100,000 contacts. Standard, at $18 a month, adds automation, A/B testing and advanced reports.
Where it falls short: Paid plans are priced by monthly email volume rather than by contact count, so a large list that mails rarely may not match the tiers neatly. The Professional plan at $499 a month is a large step up.
Price: Free. Starter from $9 a month, covering 5,000 emails a month with no daily limit. Standard $18 a month. Professional $499 a month. See the Brevo pricing page and our Brevo pricing guide.
3. Loops: SaaS product email with a free start
Does well for this audience: product teams sending onboarding and lifecycle mail on a small list. The Early Stage plan includes all features for up to 4,000 sends in any rolling 30 days, to your 1,000 newest contacts, at up to 10 emails per second.
Where it falls short: The free plan adds a Loops footer and caps the audience. The Growing Audience plan, at $99 a month, is the step for unlimited sends to subscribers and transactional sends to users outside your audience.
Price: Free on the Early Stage plan; Growing Audience $99 a month. Check the Loops pricing page and our Loops pricing guide.
4. Klaviyo: profile analytics and predictive features
Does well for this audience: teams that want profile-level analytics and an event catalogue. The free plan covers 250 profiles and 500 sends. The Email plans step from $20 a month at 500 profiles to $400 at 25,000.
Where it falls short: The price rises with active profiles at every step. Its templates and flows are mostly built around ecommerce events, so SaaS teams map trial and seat events by hand. The Email+SMS plans show no public price, so treat them as pricing on request.
Price: Free for 250 profiles; Email plan $20 a month at 500 profiles, $150 at 10,000, $400 at 25,000. See the Klaviyo pricing page and our Klaviyo pricing guide.
5. ActiveCampaign: email automation with a CRM
Does well for this audience: teams where sales follow-up and lifecycle email share one system. Starter, at $15 a month for 1,000 contacts, includes email marketing, automation, a standard CRM and ecommerce integrations. Plus at $49 adds standard segmentation and landing pages.
Where it falls short: Starting prices move with the contact count. The pricing page does not itemise AI features, so ask for a demo and test those features during the free trial before you count on them.
Price: Starter $15, Plus $49, Pro $79 and Enterprise $145 a month, each from 1,000 contacts, billed monthly. A free trial is offered. See the ActiveCampaign pricing page and our ActiveCampaign pricing guide.
6. Kit: creator lists on a generous free plan
Does well for this audience: creators and newsletter-led products. The free plan covers up to 10,000 subscribers, with landing pages, forms, unlimited email broadcasts and tagging.
Where it falls short: Visual Automations and email sequences start on the Creator plan, so the free plan is a broadcast tool. Pro adds subscriber signals, unlimited users and deliverability reporting.
Price: Free. Creator $33 a month billed annually; Pro $66 a month billed annually. Paid plans include a 14-day free trial with no credit card required. See the Kit pricing page.
7. Encharge: behavioural flows for SaaS teams
Does well for this audience: teams that trigger email from product behaviour. Growth includes unlimited flows and team members. Premium adds HubSpot, Salesforce and transactional email.
Where it falls short: Pricing is subscriber-based from the first paid step, which covers up to 2,000 subscribers. No free plan is listed on the pricing page.
Price: Growth $99 a month, or $79 a month billed annually. Premium $159 a month, or $129 billed annually. See the Encharge pricing page.
8. Postmark: transactional mail where delivery matters most
Does well for this audience: receipts, password resets and alerts, where a missed message is a support problem. The free plan covers 100 emails a month with no overages.
Where it falls short: It is not a campaign or lifecycle builder, and its pricing page lists no campaign features. Pair it with a marketing tool if you also send newsletters.
Price: Free for 100 emails a month. Basic $15 a month from 10,000 emails; Pro $16.50 a month; Platform $18 a month, all from 10,000 emails. See the Postmark pricing page.
9. Braze: large cross-channel programmes
Does well for this audience: organisations running email, push and in-app messaging from one plan, with a dedicated team and a formal rollout.
Where it falls short: No public price is listed, so the true cost, including implementation, is unknown until a sales conversation. Small SaaS teams will rarely need this scope.
Price: Pricing on request. A free trial is offered. See the Braze pricing page.