LetterDuck vs Mailchimp: marketing platform or email workspace
Mailchimp is an outbound marketing machine billed by contact count. LetterDuck is a two-way email workspace billed by domain. The list you cannot legally email decides who wins.
What each one is
Mailchimp is the best-known email marketing platform on earth: campaign builder, 200-step customer journeys, A/B and multivariate testing, predictive segmentation, send-time optimization, a mature template library with generative AI tools, and connections to 300 plus apps and e-commerce stores. Its sending infrastructure and benchmarking are established in a way a newcomer cannot fake. It is priced by contact count, it is outbound-only, and its free plan was cut in January 2026 to 250 contacts and 500 sends a month.
LetterDuck is an email workspace for your domain: a threaded team inbox for every address, reply-as-any-address, and a newsletter composer with a designed template, all with deliverability managed (SPF, DKIM, DMARC, a warm-up throttle, automatic suppression, RFC 8058 one-click unsubscribe). $50 per domain flat, unlimited addresses, unlimited subscribers, currently in waitlist mode. It is the tool for people who publish a newsletter on their own domain and also want the replies to land somewhere the whole team can see.
What each costs
| Monthly cost at | Mailchimp | LetterDuck |
|---|---|---|
| 500 subscribers | $13 | $50 flat |
| 1,000 subscribers | $26.50 | $50 flat |
| 5,000 subscribers | $75 | $50 flat |
| 10,000 subscribers | $110 | $50 flat |
Public list prices, August 2026, annual billing where offered. Mailchimp: Essentials on monthly billing, the cheapest paid tier. Standard runs $20 to $135 across the same contact counts. First-year promotional discounts are excluded. LetterDuck is $50 per domain, flat, unlimited addresses and subscribers.
Prices last verified August 7, 2026 against Mailchimp's live pricing page: five contact tiers each on Essentials and Standard, plus Premium. Mailchimp's headline prices are monthly billing; the 50%-off new-customer promo lasts 12 months and is excluded from the math.
Contact-tier pricing is a ratchet with three teeth. First, the tiers themselves: Essentials goes $13, $26.50, $45, $75, $110 at 500, 1,500, 2,500, 5,000, and 10,000 contacts; Standard runs $20 to $135 over the same range. Second, the counting: subscribed, unsubscribed, and non-subscribed contacts all count toward the billable total, and Mailchimp never archives anyone automatically. You pay indefinitely for people you legally cannot email. Third, the chain to volume: Essentials allows sends of 10 times your contact count per month, so frequent senders get pushed up-plan even with small lists, and crossing any limit means overage charges or paused sending.
A worked example. Take 5,800 contacts, 1,000 of them unsubscribed over the years. Mailchimp bills the full 5,800, which lands in the up-to-10,000 tier: $110 a month on Essentials, $1,320 a year. Archive the 1,000 dead contacts by hand and you drop to the 5,000 tier at $75. That single piece of housekeeping is worth $420 a year, and Mailchimp will never do it for you. LetterDuck at the same size, or at ten times it: $50 flat, $600 a year, and unsubscribes flow into the suppression list at no charge, permanently. The suppression list is checked before every single send; that is a deliverability control, not a billing meter.
The other half of the bill is the half Mailchimp does not sell. It is outbound-only, so the mailbox where replies land is a separate product from someone else. Add even two seats of custom-domain mailboxes and the stack math starts converging on our flat price from both directions. The wider field is covered in our Mailchimp alternatives roundup and the full Mailchimp pricing teardown.
Feature by feature
| Capability | Mailchimp | LetterDuck |
|---|---|---|
| Automation journeys | up to 200 steps on Standard | none |
| Integrations | 300 plus apps, e-commerce stores | none |
| A/B and multivariate testing | A/B on Essentials, multivariate on Premium | |
| Predictive segmentation, send-time optimization | Standard and up | |
| Template library and generative AI | mature library, custom-coded templates on Standard | designed newsletter templates, no AI |
| Established sending infrastructure | shared reputation, analytics benchmarking | we warm your own domain instead: ~150 sends day 1 to ~2,000/day by day 7 |
| Two-way team inbox | outbound-only; replies live elsewhere | every address on the domain, threaded |
| Reply from any address | pick the From on any reply | |
| Unlimited addresses on your domain | not a mailbox product | an address is a routing rule |
| Unsubscribed contacts free | billed until manually archived | suppression is free forever |
| Send volume untied to list size | 10x contacts/month on Essentials, 12x on Standard | no billing multiplier; the only cap is the deliverability warm-up throttle |
| Free tier | 250 contacts, 500 sends/month since February 17, 2026 | none; waitlist |
| Seats | 3 on Essentials, 5 on Standard, unlimited on Premium | unlimited |
| Pricing model | contact tiers with overage charges | $50 per domain flat |
Choose Mailchimp if
- Your revenue depends on automations: abandoned-cart flows, post-purchase sequences, 200-step journeys. This is Mailchimp's home turf and we do not play on it.
- You need your email tool wired into a store or a 300-app integration ecosystem.
- You want multivariate testing, predictive segmentation, and benchmarking against industry averages.
- Your list is under 250 contacts and the free plan genuinely covers you.
- You want to inherit shared sending reputation on day one instead of warming a domain for weeks.
Choose LetterDuck if
- What you send is a newsletter, not a funnel, and you are done paying tier upgrades for list growth. Newsletter creators with a growing list and no automation needs are the cleanest fit.
- A meaningful slice of your billable contacts are unsubscribed ghosts you keep forgetting to archive.
- You want replies to land in a shared, threaded inbox on your own domain instead of a personal Gmail bolted onto a marketing tool.
- You want the sending reputation you build to belong to your domain, portable to any future provider, not to a platform's shared pool.
- You want one flat number: $50 covers the inbox, the newsletter, every address, every seat, and every subscriber.
Migrating from Mailchimp to LetterDuck
The list move is an evening's work; the domain warm-up is the part to respect. When your waitlist invite arrives:
- Export three CSVs from your Mailchimp audience: subscribed, unsubscribed, and cleaned (bounced). Mailchimp's export includes all three segments.
- Import subscribed contacts as members. Import unsubscribed and cleaned straight into the suppression list, so every prior opt-out stays honored from the first send. This is a legal continuity step, not housekeeping.
- Add the DNS records we generate: SPF, DKIM, and DMARC for the sending domain, MX if you are adopting the inbox too.
- Rebuild your template once in the composer. Structured content ports in an hour; pixel-identical recreations of a heavily custom design take longer.
- Respect the warm-up. If your domain has never sent campaign volume, our throttle ramps it deliberately: roughly 150 sends on day 1 rising to about 1,100 a day by day 7, then 10 to 20% growth per day. The throttle enforces the lower of that curve and our relay ceiling, and on the free tier we run today that ceiling is 95 sends a day, so it is the ceiling that sets your schedule. A 10,000-contact list is a long first campaign, not a first hour.
- Point your signup forms at us and archive the Mailchimp audience before the next billing date.
Every campaign we send carries the RFC 8058 one-click headers, both List-Unsubscribe and List-Unsubscribe-Post: List-Unsubscribe=One-Click, and unsubscribes are honored immediately (the rule allows two days). Your Gmail and Yahoo standing depends on those headers; they are stamped automatically, not configured.