Quick answer: Shopify sellers should use Klaviyo — its Shopify integration is native and behaviour-based automations are the best in class. Etsy and Gumroad sellers should use Kit (ConvertKit) — it is built for creators and works without a transactional storefront. Mailchimp is the default for sellers who have not thought about it yet; it is fine but outgrown quickly.
Email list ownership is the only digital seller asset that is not controlled by a platform. Etsy can change its algorithm. Instagram can suppress your posts. Your email list is yours. Choosing the right platform for it matters.
The structural difference between the three
These tools sit at different points on the spectrum from "newsletter tool" to "e-commerce CRM":
- Mailchimp: Newsletter tool with e-commerce features added on
- Kit (ConvertKit): Creator-focused email tool built around audiences and automation
- Klaviyo: E-commerce CRM that does email and SMS, built around purchase behaviour
The right choice follows your platform:
| Platform | Best choice | Why | |----------|------------|-----| | Shopify | Klaviyo | Native integration, abandoned cart, purchase-based segmentation | | WooCommerce | Klaviyo | Plugin available, same depth as Shopify | | Gumroad | Kit | Simple, creator-friendly, works without a transactional store | | Etsy | Kit | No native integration exists; Kit's forms + landing pages fill the gap | | KDP (author platform) | Kit | Built for audiences, not storefronts |
Klaviyo
Klaviyo is an e-commerce email and SMS platform. Its killer feature is that it connects to Shopify's real-time event stream — every product view, add-to-cart, purchase, and refund flows into Klaviyo and can trigger an automation.
What it does exceptionally well:
- Abandoned cart sequences that fire within minutes of a cart being abandoned — and stop automatically when the buyer completes the purchase
- Post-purchase flows that adapt to what was bought (different sequence for a buyer of product A vs product B)
- Revenue tracking per email and per flow — you see exactly which automations are generating sales
- Predictive analytics that estimate a customer's lifetime value and next purchase date
Free tier: Up to 250 contacts and 500 email sends per month. Enough to build and test your welcome sequence.
Pricing at scale: Klaviyo's pricing scales with contact count. At 1,000 contacts: $20/month. At 5,000: $70/month. At 10,000: $150/month. Prices are a common complaint — at scale, it is one of the more expensive options.
When not to use Klaviyo: If you sell primarily on Etsy, Gumroad, or KDP and do not have a Shopify store, Klaviyo's e-commerce depth is wasted. Its forms, landing pages, and creator-friendly features are weaker than Kit's. You would pay more for features you cannot use.
Kit (formerly ConvertKit)
Kit is the email platform built for creators — bloggers, course sellers, digital product makers. It does not try to be an e-commerce CRM. Its strengths are in list building, segmentation by interest, and simple automation sequences.
What it does well:
- Creator-friendly landing pages and opt-in forms — the fastest way to build an email list for an Etsy or Gumroad seller
- Sequences (autoresponder series) are intuitive to build, even without technical knowledge
- Subscriber tagging — segment your list by product interest, lead magnet type, or anything else
- The free tier is genuinely usable for sellers starting out
Free tier: Up to 10,000 subscribers. Automations and sequences are available on the free plan. This is one of the most generous free tiers in email marketing.
Paid plans start at $25/month for additional features (visual automations, reporting, advanced integrations).
The Etsy-Kit setup: Etsy does not give you buyer email addresses directly via a native integration. The Kit workflow for Etsy sellers is: create a lead magnet (a free template, checklist, or resource), build a Kit landing page, link to it from your Etsy listings and social profiles, and collect emails there. Zapier can trigger Kit automations from Etsy order events once you have the integration set up.
Mailchimp
Mailchimp is the most-used email platform in the world by sheer account count — largely because of its aggressive free tier and brand recognition. For digital sellers starting out, it is not a bad choice, but it has visible limitations at the scale most growing sellers reach within 12 months.
Free tier: Up to 500 contacts, 1,000 sends per month. More restricted than Kit's free tier.
What Mailchimp does adequately:
- Basic newsletters and broadcast emails
- Simple automations (welcome email, birthday email)
- Campaign analytics
Where it falls behind:
- Its automation builder is less intuitive than Kit's or Klaviyo's
- Shopify integration exists but is less deep than Klaviyo's
- Email deliverability is average rather than excellent (more important as your list grows)
- Pricing: once you hit 500 contacts, the free tier ends — Mailchimp's paid tiers ($13-$350/month) are expensive relative to what you get
Who should still use it: Sellers who already have an existing Mailchimp list and do not want to migrate. Migration is a real pain — if you are already at 5,000 contacts and it is working, stay. If you are starting fresh, Kit is a better default.
Choosing on list size
| List size | Best choice | |-----------|------------| | 0-500, Shopify seller | Klaviyo (free tier, then grow into it) | | 0-500, Etsy/Gumroad seller | Kit (generous free tier, creator-focused) | | 500-5,000, Shopify | Klaviyo | | 500-5,000, creator platform | Kit paid or Kit free | | 5,000+, Shopify | Klaviyo | | 5,000+, multi-platform | Klaviyo or Kit depending on whether you have a transactional store |
A note on AI in email platforms
All three platforms now include AI writing assistance for subject lines and email content. In practice, these AI features are weakest in Mailchimp, adequate in Kit, and most developed in Klaviyo (which uses performance data from millions of e-commerce emails to inform its suggestions).
For any of these platforms, writing your actual email content with Claude and then pasting it into the platform gives better results than using the platform's built-in AI. Platform AI optimises for open rates; Claude optimises for what you tell it to optimise for.
