Free email allowance
SendMailOS
3,000 email credits per monthly allowance window.
Mailchimp
500 sends per month, with a 250-send daily limit.
Compare email platforms
A Mailchimp alternative for campaigns, automation, and replies
Compare SendMailOS and Mailchimp for free-plan limits, campaigns, automation, transactional email, and customer replies. See what to check before switching.
SendMailOS vs Mailchimp
Free audience size
SendMailOS
Up to 2,000 subscribed contacts.
Mailchimp
Up to 250 contacts. Contact-counting rules differ; review stored contact statuses.
Application email
SendMailOS
HTTP API and SMTP alongside campaigns. Sends use your account allowance.
Mailchimp
Mailchimp Transactional is a paid add-on to Standard or Premium. Some transactional messages are also available through marketing automation.
What to test
SendMailOS
The editor, a welcome workflow, and handling a customer reply.
Mailchimp
Your current forms, integrations, automation steps, and reports.
Plan details checked October 23, 2026. Different products count contacts and usage differently; review the linked sources and the allowances in your account.
Compare paid plans and sending costs
Unlimited emails with your own server, from €12/month
Starter includes 25,000 hosted emails per billing month, 10,000 active subscribers, and one connected sending server. Own-server sending has no monthly platform email quota and does not use hosted credits.
Starter subscription and your VPS costs apply. Warm-up, fair use, server capacity, subscriber limits and other plan limits apply.
Mailchimp: published entry plans
Essentials starts at US$13/month for 500 contacts and 5,000 monthly email sends. Standard starts at US$20/month for 500 contacts and 6,000 sends. Mailchimp’s paid plans vary by contact count and plan features. Transactional email has a separate add-on model; compare it with your whole sending workflow.
Check Mailchimp’s official pricing
Checked October 24, 2026. Competitor prices are in USD; SendMailOS prices are in EUR. These are entry-plan examples, not equal-capacity quotes or a currency conversion. Billing terms, taxes, promotions, contact tiers, and selected extras may change the final price. SendMailOS own-server delivery still requires your paid plan, VPS costs, and sending safeguards.
All SendMailOS plans
Start free, or connect your own sending server from €12/month. Every paid plan also includes a monthly hosted sending allowance.
Free
Build and test your first campaigns.
€0 / month
- Hosted emails
- 3,000
- Active subscribers
- 2,000
- Sending domains
- 1
- Tracking pixels
- 1
- Own servers
- —
Hosted delivery uses your monthly email allowance.
Start freeStarter
For one brand ready to send regularly.
€12 / month
- Hosted emails
- 25,000
- Active subscribers
- 10,000
- Sending domains
- 3
- Tracking pixels
- 3
- Own servers
- 1
Unlimited own-server emailsVPS costs, sending safeguards, and other plan limits apply.
Choose StarterGrowth
For teams managing more brands and workflows.
€39 / month
- Hosted emails
- 100,000
- Active subscribers
- 50,000
- Sending domains
- 10
- Tracking pixels
- 10
- Own servers
- 3
Unlimited own-server emailsVPS costs, sending safeguards, and other plan limits apply.
Choose GrowthPro
For larger audiences and more sending infrastructure.
€99 / month
- Hosted emails
- 250,000
- Active subscribers
- 250,000
- Sending domains
- 50
- Tracking pixels
- 50
- Own servers
- 10
Unlimited own-server emailsVPS costs, sending safeguards, and other plan limits apply.
Choose ProPrices shown per month in EUR. A hosted email uses one send per recipient. Own-server delivery does not use hosted credits. Your VPS costs and other plan limits still apply.
See every plan limitWhich one fits your work?
Choose SendMailOS when…
Your team wants to create campaigns and answer replies in the same platform. You also need application email or editable templates created through Template Studio MCP.
Mailchimp may still fit when…
Your existing Mailchimp integrations and marketing processes already do the job. Check their value before moving, especially if a specific integration is essential.
Compare the cost at your actual list size
Write down subscribed contacts, other stored contacts, campaigns per month, and automated messages. A plan that fits 200 contacts may stop fitting at 500. Compare the same audience and sending pattern rather than two entry prices.
SendMailOS plans are public: Free, Starter €12/month, Growth €39/month, and Pro €99/month. Compare the included hosted sends, active subscribers, and connected servers for your needs.
Before you switch from Mailchimp
Keep your subscriber history
Export your list and retain consent records, unsubscribes, bounces, tags, and custom fields. Do not turn unsubscribed contacts into subscribers when moving.
Rebuild one real email
Create a familiar campaign in SendMailOS. Check links, sender details, mobile rendering, and unsubscribe behavior before copying the rest.
Test the journey and the reply
Use a test subscriber to check a welcome email, its delay, and the next step. Reply to a test message and check how your team follows the conversation.
Move after the test works
Verify your domain and validate the active audience. Pause the old workflow before enabling the replacement so subscribers do not receive both.
Questions before you choose
Is SendMailOS a free Mailchimp alternative?
SendMailOS has a Free plan with 3,000 monthly email credits and up to 2,000 subscribed contacts. Other feature and account limits apply; check the pricing page and your dashboard.
Will my Mailchimp automations move automatically?
Do not assume an automatic transfer. Rebuild and test each trigger, delay, condition, template, and suppression rule before enabling a replacement.
Does switching improve deliverability?
A provider change alone does not establish better inbox placement. Test authentication, sending patterns, delivery events, and audience quality with your own messages.
Sources and comparison notes
Written by the SendMailOS team. We checked the linked product and plan documentation on October 23, 2026. This is our own comparison, not an independent product test. Features, limits, and prices can change; check the plan you will actually use.
Competitor names identify the products being compared. No affiliation or endorsement is implied.
Keep comparing
Try SendMailOS for yourself
3,000 emails each month. Up to 2,000 subscribed contacts. Check your workspace for current limits and paid plans.