Email marketing SaaS tools: Mailchimp vs ConvertKit

1. Key Differences: Mailchimp vs ConvertKit

Mailchimp
- Uses a list-based / email-sends-based pricing model. マーケティングスcoop+2emailcrush.com+2
- Free plan is relatively generous (depends on tier) but paid plans scale with list + how many emails you send. Niche Pursuits+1
- Because of the model, inactive/unsubscribed contacts might still count toward your bill. Niche Pursuits
ConvertKit
- Charges based on number of subscribers, not number of emails. マーケティングスcoop+1
- Free plan up to a limit of subscribers. TechRadar
- All (or most) core features are available regardless of plan. WebsiteBuilderly

Implication:

If you have a large list but only send occasionally, ConvertKit may be more cost-efficient (because you’re not paying for “sends” as much).
If your list is small or moderate but you want to send a lot, Mailchimp’s model can work in your favor — unless a lot of your contacts are unsubscribed or inactive, which could drive cost.

ConvertKit
- Strong “visual automation” builder, making it easy to set up branching flows. The Cluck Norris Method+1
- It tends to favor plain-text / minimalist email style, which works well for newsletters / creators / content-first. The Cluck Norris Method
- Good for building sequences, tagging users, and highly personalized journeys.
Mailchimp
- Also supports automation (Customer Journeys), though more advanced journeys are on paid tiers. emailcrush.com+1
- Richer / more visual email templates: many templates, drag-and-drop editor. emailcrush.com
- Better if you want visually rich, brand-oriented campaigns (images, design).

Implication:

Use ConvertKit if your strength (or strategy) is more content-driven (like blog newsletters, creator content) and you want clean, simple, high-engagement emails.
Use Mailchimp if design, rich visuals, branding, and image-heavy campaigns are important.

ConvertKit
- Uses a tag-based system rather than separate lists. Omnisend
- This gives more flexibility: one subscriber can be in many “segments” but not double-counted as multiple separate lists. Omnisend+1
- Good for content creators: you can tag by interest, behavior, and easily build automations off tags.
Mailchimp
- More traditional “lists” + segments. Niche Pursuits
- Powerful segmentation capabilities, plus more “conditions” for segment rules. The Cluck Norris Method+1
- More suited for data-heavy segmentation: demographics, behavior, etc.

Implication:

If you want a flexible, clean way to manage your audience via tags, ConvertKit is very strong.
If you want deep segmentation, especially for marketing campaigns, Mailchimp gives you more “dimensions” to slice your audience.

Mailchimp
- More robust reporting + analytics: campaign performance, multivariate testing, journey-level reporting, etc. emailcrush.com
- Great for marketers who want to measure ROI, A/B testing, complex funnels.
ConvertKit
- More basic analytics. Open rate, click rate, subscriber growth, but not as “enterprise-reporting-level.” emailcrush.com+1
- Creator-friendly metrics (engagement, sequence conversion) more emphasized than “marketing campaign ROI.”

Implication:

For data-driven, performance-obsessed marketing: Mailchimp is probably better.
For content creators and solopreneurs: ConvertKit’s simpler metrics may be “good enough” and less overwhelming.

ConvertKit
- Has a native “ConvertKit Commerce” to sell digital products / subscriptions. emailcrush.com+1
- Payment processing is via Stripe, and there is a fee (ConvertKit takes a cut / or processing cost) per transaction. Campaign Refinery
- Great if you are a creator selling courses, e-books, or digital products directly from email list.
Mailchimp
- Integrates with e-commerce platforms like Shopify. emailcrush.com
- With e-commerce integration + customer journey builder, you can build more complex funnels (abandoned cart, product recommendations, etc.). Campaign Refinery
- Less “native store” feature than ConvertKit, but strong for e-commerce-heavy businesses.

Implication:

If you are selling digital products, ConvertKit is very appealing.
If your business is e-commerce (physical goods), Mailchimp’s integrations + funnel capabilities are very useful.

Mailchimp
- Offers email and live chat for most (+ depending on plan) and phone support on premium plan. TechRadar+1
- Good documentation, a large ecosystem of experts / consultants.
ConvertKit
- Email + live chat. No phone support. TechRadar
- Support is decent, but the speed / depth depends on plan level. emailcrush.com
- Community forums + good onboarding for creators.

Implication:

If phone or 24/7 live support is important, Mailchimp might be more reliable (especially on higher plans).
For creators / smaller teams, ConvertKit’s support channels are probably sufficient.

Many users think ConvertKit has very good deliverability (especially for creator-style emails). Reddit
Because ConvertKit’s emails often look like “real person / plain text,” they may avoid spam/promotional tabs more easily (depending on audience).
Mailchimp is very mature and used by many big brands, so deliverability is generally strong, but deliverability depends more on how you use it (list hygiene, engagement).

Given you’re considering for “email marketing SaaS tools,” here are some SaaS-specific thoughts:

If you’re using email mainly for product onboarding, trial drip, user education → ConvertKit is very good because of its strong automation, tagging, and sequence capability.
If you’re doing marketing campaigns, newsletters, cross-channel marketing, or run a business + want to tie email into ads / ads-retargeting, Mailchimp may be more powerful.
If you want to sell digital products to your users (e.g. premium content, courses), ConvertKit’s commerce tools are helpful.

ConvertKit Trade-offs
- Might become expensive when your list gets very big. Niche Pursuits
- Simpler analytics: less granular data for deep marketing optimization.
- Limited design freedom (if you want very graphic-rich newsletters).
Mailchimp Trade-offs
- You may pay for contacts you don’t actually use (inactive / unsubscribed) if you don’t clean your list.
- Free plan has limitations; advanced automation / features require upgrading.
- Complexity: more features means more to learn.

For creators, bloggers, indie SaaS founders, I lean toward ConvertKit. It’s more “writer / creator friendly,” automations are clean, and it’s very good for building meaningful relationships.
For businesses that send marketing campaigns, run e-commerce, or need detailed analytics, Mailchimp is likely the better pick.
If budget is tight but you expect your list to scale, run the numbers: check how pricing scales for both with your expected subscriber count + email frequency.