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 |
| 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. | pricing page |
| LetterDuck | $50 per domain, flat. Unlimited addresses, contacts and subscribers. | pricing |
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, and that is before Mailchimp's own contact-tier steps do their work. It is the same arithmetic that pushes people toward everything else in the category.
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.
