Go with Brevo (formerly Sendinblue) if you need the most affordable entry point — it has a free plan that lets you send up to 300 emails per day, and paid plans start at $12/month.
If you've outgrown basic autoresponders and need conditional logic, lead scoring, or genuinely complex behavior-driven journeys, ActiveCampaign is worth the step up. Pricing starts somewhere between $15 and $19/month for up to 1,000 contacts depending on the plan and billing cycle — sources differ slightly, so check ActiveCampaign's current pricing page directly before committing. What isn't in dispute: the automation depth is hard to beat at this price range, and it holds a 4.5/5 rating across more than 13,000 reviews on G2 and Capterra.
For e-commerce, Omnisend and Klaviyo are the specialists. Omnisend's paid plans start at $16/month (for up to 500 contacts and 6,000 emails/month) and include a free tier. Klaviyo's free plan covers up to 500 contacts, with paid plans from $20/month. Both are built around retail integrations and multi-channel triggers that generic platforms just don't prioritize.
Mailchimp sits in an interesting middle ground. According to its own marketing, it claims to be the "#1 AI-powered email marketing and automation platform" with more than 45 behavioral triggers — worth taking with a grain of salt since that's Mailchimp talking about Mailchimp, but the feature set is real and the free plan is generous for lists under 500 contacts. Paid plans start at $13/month.
HubSpot is the heavy hitter. It has a free CRM tier and paid plans from $15/month, but its real power — and cost — kicks in at higher tiers. It's best suited for businesses that need full-funnel visibility across sales and marketing, not just email. If all you need is email automation, HubSpot is probably overkill.
DripDraft — our pick (and yes, it's ours)
Full disclosure: DripDraft is our own tool, so consider us biased — but it earns the top spot for one reason. The tools below help you sequence and send; the real grind is writing a genuinely personal follow-up for every prospect without losing your morning. DripDraft drafts each one in your voice and lands them in your Gmail as drafts you review and send — never auto-blasted, which protects your deliverability and sender reputation. Pair it with Hunter.io to find and verify addresses and you've got the whole loop — find, write, follow up — without a five-tool stack. Free plan: 10 campaigns/month. Start free →
Quick Comparison: Which Tool Fits Your Situation
- Tightest budget, need free plan: Brevo (300 emails/day free) or Mailchimp (500 contacts free)
- Need serious automation without enterprise pricing: ActiveCampaign (from ~$15–$19/month)
- Running an online store: Omnisend (from $16/month) or Klaviyo (from $20/month)
- Want everything under one roof: HubSpot (free tier available, scales up fast)
A Note on AI-Powered Sending
If you're curious about AI send-time optimization, one head-to-head test run by iReadCustomer on a mid-sized global e-commerce brand with 100,000 subscribers found that Klaviyo's AI Smart Send Time achieved a 26.8% open rate compared to 21.4% using Mailchimp's traditional manual scheduling. That's a meaningful difference — but keep in mind this was a large e-commerce operation, not a 500-person list. Results at small business scale will vary. Still, it points to a real advantage once your list is big enough for AI to find patterns in.