Best AI Email Marketing Software in 2026: Which Tools Name Real AI, and What They Cost
Our pick for most teams that want AI inside their email tool is Customer.io, on its Essentials plan at $100 a month billed monthly. That plan names AI Agent core skills and a visual workflow builder, which makes it the clearest AI feature in this guide at that price. The catch is profile pricing: the $100 line does not state a profile allowance, and the first profile-count tier is $145 a month for 10,000 profiles.
This guide reads "AI" literally. A tool earns AI credit here only when its pricing page names an AI feature in the plan details. A subject-line A/B test is optimization, not AI, and is listed separately. Prices come from each vendor's pricing page, checked 7 October 2026. Plans change, so confirm the figure on the vendor page before you buy.
Quick Answers by Use Case
- Product teamsCustomer.io, from $100/mo billed monthly, with AI Agent core skills named on Essentials.
- Sales-ledClose, from $9 per user a month billed annually, with 500 to 2,000 AI credits per user.
- CreatorsKit, free for up to 10,000 subscribers, with subject-line A/B tests.
- Early SaaSLoops, free for up to 4,000 sends in any rolling 30 days.
What Counts as AI in This Guide
Vendors use "AI" for very different features, and most pricing pages do not explain the difference. This guide credits AI only where a plan names it. Customer.io names AI Agent core skills on Essentials and elevated AI Agent limits on Premium. Close gives every user a monthly allowance of AI credits, from 500 on Solo to 2,000 on Scale. Segment, which is a customer data platform rather than an email tool, lists AI predictions and audiences as add-ons, with pricing on request.
Where a plan names only A/B testing or automation, the table says so. A/B testing of subject lines helps you choose between copy you wrote; it does not write the copy. Ask a vendor which AI feature is included, what usage limit applies, and whether it is part of the plan or sold separately.
Comparison: Best For, Entry Price and Key Limitation
| Tool | Best for | AI named on pricing page | Entry price (plan, billing) | Key limitation |
|---|---|---|---|---|
| Customer.io | Product teams with event data | AI Agent core skills (Essentials); elevated AI Agent limits (Premium) | $100/mo Essentials, billed monthly | Profile pricing rises by $90 a month per 10,000 profiles |
| Close | Sales-led teams wanting email in a CRM | 500 to 2,000 AI credits per user per month | Solo $9/user/mo billed annually ($19 monthly) | Priced per user; built for sales, not list marketing |
| ActiveCampaign | Automation and CRM-led teams | Not named in plan details; confirm on the pricing page | Starter $15/mo, starting at 1,000 contacts | Price rises with contact count; Pro needed for advanced segmentation |
| Brevo | Budget bulk and SMS senders | Not named in plan details | Starter $9/mo, from 5,000 emails a month | Professional jumps to $499/mo at higher volumes |
| Klaviyo | Online stores with profile data | Not named in plan details | Email plan $20/mo at 500 profiles | Priced per profile; Email+SMS pricing on request |
| Kit | Creators and newsletter businesses | A/B testing of subject lines (Creator) | Free up to 10,000 subscribers | Visual Automations need the Creator plan |
| Loops | Early-stage SaaS sending | Not named in plan details | Free: up to 4,000 sends in a rolling 30 days | Free plan carries a Loops footer |
| Encharge | Behavioral flows for SaaS | Not named in plan details | Growth $79/mo billed annually ($99 monthly), up to 2,000 subscribers | Listed tiers stop at 2,000 subscribers |
| Userlist | SaaS lifecycle messaging | Not named in plan details | Basic $149/mo up to 10,000 users; +$10 per extra 1,000 | Priced by user count; match the tier to your user base |
| Mailchimp | Simple newsletters | Not named in plan details | Free: up to 250 contacts and 500 sends a month | Free plan is capped at 250 per day; paid prices on request |
Tool by Tool: Who Each One Serves
Customer.io: AI Agent skills from $100 a month
Customer.io suits product teams that already send events, such as trial starts, feature use and subscription changes, and want email, in-app and SMS messages triggered by them. The Essentials plan at $100 a month billed monthly names AI Agent core skills and a visual workflow builder, so the AI sits in a plan many small teams can afford. Eligible early-stage companies that have raised under $10M can receive 12 months free through the Startup Program.
The limitation is profile pricing. The profile-count tiers are $145 a month for 10,000 profiles, $235 for 20,000, $325 for 30,000 and $415 for 40,000, all billed monthly, and the Premium plan at $1,000 a month adds custom profile volume and elevated AI Agent limits. Plan for an engineer to instrument events properly. Full pricing: Customer.io pricing.
Close: AI credits per user for sales-led email
Close is a sales CRM that includes email, calling and SMS. Its AI credit allowance is the clearest per-seat AI figure in this guide: 500 credits per user a month on Solo, 1,000 on Essentials, 1,500 on Growth and 2,000 on Scale. Solo is $19 a month or $9 a user billed annually; Essentials is $49 or $35; Growth is $109 or $99; Scale is $149 or $139. Bulk email starts on Growth.
Close is a poor choice for a list-first newsletter, because it is priced per user and built around pipeline work. Calling and SMS usage is passed through at cost. There is a 14-day free trial with no credit card and no ongoing free plan. Pricing: Close pricing.
ActiveCampaign: automation and CRM on one price list
ActiveCampaign suits teams where sales and email share one funnel. Starter is $15 a month, Plus $49, Pro $79 and Enterprise $145, all starting at 1,000 email contacts, with the same price for monthly and annual billing on the listing. Pro adds advanced segmentation, and Enterprise adds premium segmentation and a dedicated account team. A free trial is available.
The limitation is contact pricing. Every step up the list raises the cost, so a large dormant archive costs money without producing sends. The tier notes do not name an AI feature, so confirm AI capability on the pricing page before you assume it. Details: ActiveCampaign pricing guide and the vendor pricing page.
Brevo: low entry price for high-volume senders
Brevo prices by monthly email volume rather than contacts. Its free plan allows 300 sends a day and storage for up to 100,000 contacts. Starter is $9 a month for at least 5,000 emails, with no daily sending limit. Standard is $18 a month and adds automation, A/B testing and advanced reports. Professional is $499 a month for 150,000 to 10 million sends and up to 2 million contacts.
Brevo is a good fit for businesses that send a lot of broadcast email and some SMS. The jump from Standard to Professional is large, and the plan notes do not name an AI feature. Pricing: Brevo pricing, with the Brevo pricing guide.
Klaviyo: profile-priced email for online stores
Klaviyo is built around customer profiles and purchase data, which makes it a natural choice for online stores that want flows triggered by browsing and buying. The email plan steps from $20 a month at 500 profiles to $30 at 1,000, $60 at 2,500, $100 at 5,000, $150 at 10,000 and $400 at 25,000. The free plan covers 250 profiles and 500 sends a month. Email+SMS pricing is on request.
Profiles are the cost driver, so keep the list clean before you choose a tier. The plan notes here do not name an AI feature. Pricing: Klaviyo pricing, and the Klaviyo pricing guide.
Kit: free for up to 10,000 subscribers
Kit is the easiest free start for creators and newsletter businesses. The free plan covers up to 10,000 subscribers with unlimited landing pages, forms and email broadcasts, tagging and segmentation. Creator is $33 a month billed annually and adds unlimited Visual Automations, email sequences and A/B tests on subject lines. Pro is $66 a month billed annually and adds deliverability reporting, unlimited users and a newsletter referral system.
Kit's limitation is product depth: billing-event flows are not part of its plan notes, and AI is not named. A 14-day free trial is available on paid plans with no credit card. Pricing: Kit pricing.
Loops: free start for early SaaS
Loops is built for early-stage SaaS teams that want a simple API-first tool. The free Early Stage plan includes all features, up to 4,000 sends in any rolling 30 days to the 1,000 newest contacts, and 10 emails per second, with a Loops footer. The Growing Audience plan at $99 a month allows unlimited sends to subscribers and transactional sends to users outside your audience.
The free plan's send cap and footer are the limits to plan around. The plan notes do not name an AI feature. Pricing: Loops pricing, and the Loops pricing guide.
Encharge: behavioral flows priced by subscriber
Encharge suits SaaS teams that want flows built around what users do, and it includes unlimited flows and team members on each paid plan. Growth is $79 a month billed annually, or $99 monthly, for up to 2,000 subscribers with 10 times the subscriber limit in monthly sends. Premium is $129 billed annually, or $159 monthly, and adds HubSpot, Salesforce and transactional email, with 12 times the subscriber limit in sends.
The listed tiers stop at 2,000 subscribers, so larger lists need a quote. The plan notes do not name an AI feature. Pricing: Encharge pricing.
Userlist: lifecycle messaging for SaaS users and companies
Userlist sends lifecycle email and in-app messages to users and companies, and its segments cover both. Basic is $149 a month for up to 10,000 users and includes segments for users and companies, with $10 a month for each additional 1,000 users. Professional adds A/B split testing and conversion goals at $349 a month for up to 10,000 users, with $12 a month for each additional 1,000 users.
The plan notes do not name an AI feature. Pricing: Userlist pricing.
Mailchimp: free plan for small newsletters
Mailchimp's free plan covers up to 250 contacts and 500 sends a month, with a maximum of 250 sends a day. It is a sensible way to start a small newsletter. Paid plan prices are not covered in this guide, so use the pricing page for current figures. The plan notes do not name an AI feature, and a free plan does not carry lifecycle features such as billing triggers. Pricing: Mailchimp pricing, and the Mailchimp pricing guide.
What It Costs at 1,000, 10,000 and 25,000 Contacts
The table uses only plan prices named by each vendor. Where a vendor does not list a plan at that size, the cell says pricing on request. Monthly and annual prices are marked. Use it to compare plans at the same size, not to predict a final invoice, because send volume, SMS and add-ons change the total.
| Tool | 1,000 contacts | 10,000 contacts | 25,000 contacts |
|---|---|---|---|
| Customer.io | Pricing on request | $145/mo (Essentials 10k profiles, billed monthly) | Pricing on request |
| ActiveCampaign | Starter $15/mo; Plus $49/mo; Pro $79/mo | Pricing on request | Pricing on request |
| Klaviyo | $30/mo (email plan, 1,000 profiles) | $150/mo (email plan, 10,000 profiles) | $400/mo (email plan, 25,000 profiles) |
| Kit | Free | Free (up to 10,000 subscribers) | Pricing on request |
| Loops | Free (up to 4,000 sends in a rolling 30 days) | $99/mo (Growing Audience plan) | $99/mo (Growing Audience plan) |
| Encharge | $79/mo billed annually (Growth, up to 2,000 subscribers) | Pricing on request | Pricing on request |
| Userlist | Pricing on request | $149/mo (Basic, up to 10,000 users) | Pricing on request |
Customer.io's profile tiers rise by $90 a month for each 10,000 profiles between 10,000 and 40,000, so a list that grows from 10,000 to 30,000 profiles moves the bill from $145 to $325 a month, billed monthly. Klaviyo's email plan rises by $250 a month between 10,000 and 25,000 profiles. Both costs grow with the number of profiles you keep, active or not.
How to Choose: If You Need X, Pick Y
| If you need | Pick | Because |
|---|---|---|
| AI features inside a plan you can pay for monthly | Customer.io (Essentials) | AI Agent core skills are named on the $100 monthly-billed plan |
| AI credits per seat and email inside a CRM | Close | 500 to 2,000 AI credits per user a month, with Solo from $9 a user billed annually |
| A free start for a list under 10,000 subscribers | Kit | Free plan covers unlimited broadcasts up to 10,000 subscribers |
| Automation with a CRM for a sales team | ActiveCampaign (Pro for advanced segmentation) | Pro is $79 a month and adds advanced segmentation to automation |
| Profile-based flows for an online store | Klaviyo | Email plan prices step from $20 at 500 profiles to $400 at 25,000 |
| Cheapest high-volume broadcasts with SMS | Brevo (Starter or Standard) | Starter from $9 a month for 5,000 emails, with no daily sending limit |
| Lifecycle email for early SaaS on a budget | Loops (free, then $99 a month) | Free plan allows 4,000 sends in any rolling 30 days |
| Behavioral SaaS flows with HubSpot or Salesforce sync | Encharge (Premium) | Premium lists HubSpot, Salesforce and transactional email |
| A small newsletter with no budget | Mailchimp (free plan) | Free plan covers 250 contacts and 500 sends a month |
Pick the tool by the workflow you run most. An AI feature that writes content matters less to a team whose revenue comes from trial-to-paid flows than the ability to trigger those flows from product events. Price comes second: a cheap plan with the wrong trigger model costs more in engineering time than the subscription saves.
Setup and Migration: Moving Without Losing Deliverability
Moving to an AI-enabled tool changes sender reputation, so treat the move as a deliberate migration rather than a file export. Start with consent. Export contacts with their consent status and suppression reasons, and import the suppression list before any campaign runs on the new tool. Emailing people who opted out is the most common cause of deliverability damage during a move.
| Step | Action | Done when |
|---|---|---|
| 1. Export contacts and consent | Export contacts with consent status, suppression reasons and bounce history | Counts in the new tool match the old one |
| 2. Size the plan | Count active profiles or contacts, not the total archive, then pick the tier | The tier covers the active list with room to grow |
| 3. Authenticate the domain | Set up SPF, DKIM and DMARC for the sending domain | Test sends pass all three checks |
| 4. Rebuild one flow at a time | Start with onboarding, then move trial and win-back flows | Each flow tested on a sample profile |
| 5. Run both tools in parallel | Keep the old tool sending for two to four weeks | Bounce and complaint rates stay stable |
| 6. Retire the old sends | Turn off the old tool only after the last live flow moves | No active flow remains on the old tool |
If you use AI credits or AI agent skills, test them on a small segment before you rely on them. Check how many credits or runs one campaign uses, and set a monthly budget against the plan's limit. Credit-based AI costs are easy to underestimate once a team starts using them daily.
Bottom Line
For AI that a plan names, buy Customer.io on Essentials at $100 a month billed monthly, and budget from $145 a month once you need 10,000 profiles. For per-seat AI credits inside a CRM, Close is the cleaner fit. For a free start, Kit and Loops both have usable free plans, with the limits listed above. Confirm the plan price and AI feature on each vendor's pricing page before you sign up.
Keep Researching
- Pricing guides: pricing overview, Customer.io, ActiveCampaign, Brevo, Klaviyo, Loops, Mailchimp
- About this site: who writes these guides and how they are edited
Frequently Asked Questions
Which AI email tool has the lowest price with AI named in its plan?
Close has the lowest seat price of the tools that name AI credits: Solo is $9 a user a month billed annually, or $19 billed monthly, and includes 500 AI credits per user. For a list-based marketing team, Customer.io is the lowest-priced plan in this guide that names AI Agent core skills, at $100 a month billed monthly on Essentials.
Does AI in an email tool mean it writes whole sequences?
Not always. The plan details in this guide name different things: AI Agent core skills at Customer.io, per-user AI credits at Close, and AI predictions as an add-on at Segment. Subject-line A/B testing, as on Kit Creator, is optimization rather than generation. Read each plan for the exact feature before you assume it writes content for you.
How does profile-based pricing change as my list grows?
Customer.io's profile tiers rise by $90 a month for each step from 10,000 to 40,000 profiles: $145, $235, $325 and $415, billed monthly. Klaviyo's email plan rises from $30 at 1,000 profiles to $150 at 10,000 and $400 at 25,000. Dormant profiles count toward the tier, so clean out inactive contacts before you pick a size.
Can I start without paying?
Several tools offer a free plan with limits. Kit is free for up to 10,000 subscribers, though Visual Automations need the Creator plan. Loops allows up to 4,000 sends in any rolling 30 days. Mailchimp's free plan covers up to 250 contacts. Customer.io offers 12 months free through its Startup Program to eligible early-stage companies that have raised under $10M. Close and ActiveCampaign offer free trials but no ongoing free plan.
Do I need a separate transactional email provider?
It depends on the tool. Loops includes transactional sends to users outside your audience on its paid Growing Audience plan. Encharge lists transactional email on its Premium plan. Many teams using Mailchimp add a separate sending service for receipts and password resets, which splits the sender reputation across two systems.
What should I check on a pricing page before buying an AI plan?
Check four things: which AI feature each plan includes, whether AI usage has a monthly credit or limit, whether the price is billed monthly or annually, and whether the price counts contacts, profiles, users or sends. Those four settings decide most of the real cost. The vendor pages linked in this guide are the source for each figure.