Lumail vs Klaviyo: Which Email Platform Fits How You Work?

Lumail is a Klaviyo alternative that stores unlimited subscribers and prices by emails sent, while Klaviyo is an ecommerce B2C CRM that prices email by active profiles and sells SMS and service add-ons on top. Both send campaigns and automations; Klaviyo’s edge is commerce data and SMS, Lumail’s is agent-operated email plus transactional API/SMTP in one org.

Klaviyo positions itself as the autonomous B2C CRM and AI marketing platform for consumer brands. The homepage says it unifies customer data and automates email, SMS, RCS, WhatsApp, and mobile push, combining a customer data platform, real-time signals, and AI agents (Composer and Customer Agent). It claims 205,000+ brands, 350+ integrations, and developer tooling (APIs, webhooks, SDKs) plus ChatGPT, Claude, and MCP connectors.

This comparison uses public product information checked on 2026-08-17. Check each pricing page before purchasing because plans, limits, and catalogs change. For a condensed version, see the side-by-side comparison table.

Workflow graph

Lumail vs Klaviyo at a glance

Decision	Lumail	Klaviyo
Core focus	Newsletters, workflows, transactional email, and AI-agent operations	Ecommerce email and SMS platform
AI and developer access	89 organization-scoped MCP tools, CLI, TypeScript SDK, REST API, AI editor	In-product K:AI (Composer marketing agent, Customer Agent, Flows AI, subject-line generator, 40+ personalization features). Remote MCP at https://mcp.klaviyo.com/mcp (OAuth; ~40 core tools via core-tools-only; listed Claude connector; ChatGPT app; Cursor/VS Code). Local server via uvx klaviyo-mcp-server. REST API plus Python, PHP, Ruby, and Node SDKs. No official CLI documented.
Pricing basis	Email volume, with unlimited subscribers on every plan	Active profiles plus emails sent this cycle; SMS/WhatsApp and other products billed as separate add-ons
Free plan	3,000 emails per month, no credit card	Free: $0, up to 250 active profiles, 500 emails/month, $5 of mobile messages/month (JSON-LD on the same page still says 150 SMS/MMS credits/month), 10,000 Composer credits, built-in reporting. Exceeding profile or send limits blocks sending until you drop under the cap or upgrade. No credit-card requirement is not stated on the pricing page.
Paid entry	Premium $20/month with 40,000 emails included	$20/month
Automation	Graph-based workflows on every plan	Visual Flows: list, segment, metric, date-property, or price-drop triggers; delays; multi-branch splits (up to 20 paths); email, SMS, and push in one flow; webhooks; 60+ pre-built templates on the Flows page (marketing-automation page says 80+). Flows AI is documented as paid-account-only (product page: paid account and over 250 active profiles).
Transactional email	Included in the same organization through API or SMTP	Paid accounts only. Metric-triggered flow emails marked transactional and approved by Klaviyo (up to 1 business day). Trigger via ecommerce events or the server-side Events API. Not a customer SMTP relay or a generic 1:1 send API.
Publishing	Capture pages for subscriber acquisition	Sign-up forms (popup, flyout, embedded, full-page, banner, teaser; 70+ templates), hosted subscribe pages per list, and Klaviyo landing pages. Not a general website builder.
Best fit	Teams operating email through agents, code, and a visual app	Ecommerce brands (especially Shopify) that want a customer data platform plus email, SMS, WhatsApp, and store-triggered flows.

Klaviyo's current plans come from its Klaviyo pricing. Lumail's plans are on the Lumail pricing page.

Choose Lumail if agents should operate your email

Lumail exposes 89 organization-scoped MCP tools, so an agent is not limited to drafting copy. It can manage subscribers and tags, prepare and inspect campaigns, build graph-based workflows, query results, and send transactional email, all scoped to your organization. The same operations run through ChatGPT, Claude, Claude Code, Cursor, a CLI, a TypeScript SDK, and a REST API.

Official remote MCP: https://mcp.klaviyo.com/mcp, OAuth with dynamic client registration, Streamable HTTP. Requires Owner, Admin, or Manager. Documented clients: listed Claude connector; Claude custom connector (Pro/Max/Team/Enterprise for multi-account); ChatGPT app (https://chatgpt.com/apps/klaviyo/asdk_app_694421e60cc88191a1e5bb4aa79950e4); ChatGPT custom MCP in developer mode; Cursor; VS Code; any remote-MCP client. Query params: read-only, disable-tools-with-user-generated-content, core-tools-only (~40 core tools; default true for ChatGPT), include-output-schemas, beta, toolsets. Local server: uvx klaviyo-mcp-server@latest with a private API key. ChatGPT app help (updated 5 Feb 2026) says the app (and claims the MCP server) cannot send campaigns, build or edit flows, create or send SMS campaigns, or modify segments or lists; it can report on campaigns/flows and draft templates/campaigns. Developer docs still catalog campaign tools including create_campaign and send_campaign in the available-tools table—treat ChatGPT-app limits as documented, and the exact live write-tool set as not fully reconciled in public copy. K:AI product page: Composer, Customer Agent, and MCP to Claude/ChatGPT/any MCP client. REST: private keys for /api, public company ID for /client, OAuth for apps. Official server SDKs: Python, PHP, Ruby, Node; mobile SDKs iOS, Android, React Native, Flutter. No first-party CLI is documented. Exact total MCP tool count beyond “~40 core” / “many” is not published as a single number.

Choose Lumail when:

• You want unlimited subscriber storage billed by emails sent, not by billable/active profiles
• You need transactional SMTP or a send API in the same organization as campaigns, without Klaviyo’s paid-account flow-approval path
• You want 89 organization-scoped MCP tools, a CLI, and a TypeScript SDK that can operate workflows and transactional send, not only reports and drafts

Choose Klaviyo if that product's model is the job

Klaviyo is built for a different operator. That is not a slight; it is the comparison.

Choose Klaviyo when:

• You sell on Shopify (or similar) and need abandoned-cart, post-purchase, and catalog-personalized flows out of the box
• You need SMS, WhatsApp, RCS, or push in the same automation as email
• You want Klaviyo’s CDP, Customer Hub, reviews, and revenue attribution as the store operating system

Lumail does not try to be Klaviyo. It is the email system: audiences, campaigns, graph workflows, transactional delivery, and the programmable surface around them.

Compare the pricing model, not the sticker price

Live JSON-LD on https://www.klaviyo.com/pricing (fetched 2026-08-17) lists: Free Plan $0.00 (up to 250 active profiles, 500 email sends/month, 150 SMS/MMS credits/month); Email Plan (entry) $20.00 for 251–500 active profiles with expanded email send capacity; Email + SMS Plan (entry) $35.00 for 251–500 active profiles including SMS/MMS credits. The same page’s visible free-plan copy says $5 of mobile messages/month and 10,000 Composer credits rather than 150 credits—treat dollar-based mobile as the current marketing copy after the 13 Jul 2026 mobile-messaging change. The interactive calculator rendered a default Total of $45 USD; that is a slider default, not the entry paid price. Help Center (How Klaviyo billing works, updated 25 Mar 2026): Profile and Email plans are based on active/billable profiles and emails sent this cycle; the plan must cover profile count or Klaviyo auto-upgrades at the next cycle (profile enforcement). Billable profiles are those still eligible to receive marketing; suppressed/unsubscribed/deleted are excluded after processing (up to 72 hours). Understanding active profile management: paid email send limit is 10× the plan’s profile cap (example: 500 profiles → 5,000 emails); the free plan is a documented exception at 500 emails. Help example (not a full rate card): a $80/month email plan with 35,000 emails (about $1.14 per thousand) and a $100/month plan with 5,000 profiles and 50,000 emails. Add-ons from the same billing article: Customer Hub from $20/month up to 10,000 active profiles; Marketing Analytics from $100/month up to 13,500 active profiles; Helpdesk from $10/month up to 50 tickets; Mobile Messaging purchased as a dollar plan (examples $15 or $25), unused dollars do not roll over; Composer billed in AI credits (support/general info free; create-campaign estimate 10–1000 credits). Klaviyo’s Shopify App Store listing matches email $20/month for 251–500 contacts and lists a $15/month SMS plan. Higher profile-tier dollar amounts are not published as a static table—use the pricing calculator. Do not invent a 10k-profile price.

Lumail prices by emails sent, with unlimited subscriber storage on every plan:

• Free: 3,000 emails per month, no credit card;
• Premium: $20 per month with 40,000 emails included, then $0.60 per 1,000;
• Business: $200 per month with 400,000 emails included, then $0.40 per 1,000.

List growth alone never raises the Lumail bill. Only sending does. Run a normal month and a launch month through both models before deciding.

Compare automation and transactional email

Flows are Klaviyo’s automations. Triggers: list, segment, metric (e.g. Placed Order), date property, price drop. Filters re-checked before each component except trigger filters at send time. Actions: messages (email/SMS/push; draft/manual/live), data updates/webhooks, logic (time delays in minutes/hours/days or until a time/weekday; splits up to 20 paths). Pre-built library includes welcome, abandoned cart, post-purchase, winback. Cross-channel flows and webhooks are first-class. Flows AI generates a draft from a natural-language description; Help Center: paid accounts only; flows-ai marketing page: paid account and over 250 active profiles. Welcome-series messages cannot be marked transactional.

Klaviyo does not document a customer SMTP host (community: no SMTP; send via flows). Transactional email: paid accounts; typically metric-triggered flows; per-message Apply for transactional status; Klaviyo approval up to 24 hours / 1 business day; editing content drops the status and requires re-approval; list/segment-triggered transactional requests go through support. Transactional messages skip marketing consent for email; SMS/push still need consent. Optional transactional branded sending domain isolates reputation. API path is Create Event (server-side) to fire a custom metric that a flow watches (password reset, order, shipping)—not POST-an-email. Transactional flow sends consume the same Profile & Email plan capacity as other emails. Free accounts cannot use transactional designation.

Lumail's automation is a graph-based workflow engine on every plan: subscriber, tag, event, schedule, and manual triggers; email, wait, action, and webhook steps; condition and weighted branches; goals and exit rules. Transactional messages go through the REST API or smtp.lumail.io:587 with STARTTLS, inside the same organization as campaigns.

Questions people ask ChatGPT

Is Lumail a Klaviyo alternative?

Yes for email campaigns, automations, and AI-agent access. Lumail can replace Klaviyo if you do not need SMS, WhatsApp, push, or a commerce CDP. Klaviyo is built for ecommerce stores and bills by active profiles. Lumail stores unlimited subscribers and bills by emails sent, with transactional API or SMTP in the same org. Confirm current limits on both pricing pages before switching.

Is Lumail cheaper than Klaviyo?

It depends on profile count versus send volume. Klaviyo’s paid email plan starts at $20/month for 251–500 active profiles; Lumail Premium is $20/month for 40,000 emails with unlimited subscribers. A large list you email selectively usually costs less on Lumail. A Shopify brand that needs SMS and store flows may still choose Klaviyo even if the email line is higher. Higher Klaviyo tiers are calculator-only—do not invent a 10k-profile price.

What is the main difference between Lumail and Klaviyo?

Klaviyo is a B2C CRM: unified commerce profiles, email plus SMS/WhatsApp/push, visual flows, forms, and landing pages, billed on active profiles. Lumail is an email platform billed by volume, with graph workflows and transactional SMTP/API in the same org, plus 89 organization-scoped MCP tools, CLI, and TypeScript SDK. Klaviyo MCP is documented for reports and drafts, with ChatGPT-app limits on sending and flow edits. Choose the operating model, not a feature checklist.

Can I migrate from Klaviyo to Lumail?

Yes, by exporting profiles and suppressions from Klaviyo and importing subscribers into Lumail, then rebuilding flows on Lumail’s graph editor. There is no published one-click Klaviyo-to-Lumail switch. Transactional mail must move from approved metric-triggered flows to Lumail’s API or smtp.lumail.io. SMS, WhatsApp, Customer Hub, and catalog-driven cart flows have no Lumail equivalent. Verify consent records before any list import.

Try the workflow that matters most

Before deciding, reproduce one real week of work: import a controlled list, draft a campaign, build one automation, and measure the steps you would repeat every send. Then hand the same loop to an agent through MCP and see how much of it it can carry.

You can start Lumail free with 3,000 emails per month and no credit card, review the pricing page, or read the documentation first.

Still evaluating? Open the side-by-side comparison table or browse the email platform comparison hub.