Sender vs Mailchimp
2,500 free subscribers against 500, on two very different feature depths.
What matters for growth and lifecycle teams
Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.
| Priority | Sender | Mailchimp / Mandrill |
|---|---|---|
| Scheduling | Yes | Yes |
| Event stream | Yes | Yes |
| Deliverability | Marketing sender with shared IPs on lower plans and dedicated IP availability on Professional accounts by request. | Mixed; depends heavily on the shared IP pool you land on. |
| Operating since | 2012 | Not published |
| Suppressions API | Yes | Yes |
| Best published rate per 1,000 | Tiers not published in comparable form | Tiers not published in comparable form |
| Multi-tenant | No | No |
| Free tier | Free forever for 2,500 subscribers and 15,000 emails/mo | 500 contacts, 1,000 sends/month |
| Starts at | Paid plans start at the 1,000-subscriber tier; exact price is shown in the account slider | $13/mo Essentials |
For lifecycle and activation work running behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, the two are level on every priority that can be scored here, so the choice comes down to price and to which product your team would rather operate. On free tier, Sender offers Free forever for 2,500 subscribers and 15,000 emails/mo against 500 contacts, 1,000 sends/month from Mailchimp / Mandrill. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | Sender | Mailchimp / Mandrill |
|---|---|---|
| Deliverability | Marketing sender with shared IPs on lower plans and dedicated IP availability on Professional accounts by request. | Mixed; depends heavily on the shared IP pool you land on. |
| Multi-tenant | No | No |
| Free tier | Free forever for 2,500 subscribers and 15,000 emails/mo | 500 contacts, 1,000 sends/month |
| Starts at | Paid plans start at the 1,000-subscriber tier; exact price is shown in the account slider | $13/mo Essentials |
| Tagline | Budget-friendly email marketing with a generous free plan. | Legacy marketing giant, transactional via Mandrill. |
| Pricing model | subscriber-based | subscriber-based |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| SDKs | None | node, python, php, ruby |
| Templates | rich | rich |
| React Email | No | No |
| Webhooks | Yes | Yes |
| Inbound | No | No |
| Idempotency | No | No |
| Dedicated IP | Yes | Yes |
| DX score | 6/10 | 5/10 |
| Best for | Budget-conscious startups that need newsletters, basic automation, forms, and transactional email on a generous free plan. | Non-technical marketers who already use Mailchimp. |
Sender
- ›Very generous permanent free plan
- ›Transactional emails are included instead of sold as a separate product
- ›Automation, forms, landing pages, and templates are available from the free plan
- ›24/7 support is promoted even for free users
- ›Paid prices were not available in the public pricing page crawl because the slider errored
- ›Less advanced lifecycle depth than Customer.io, Loops, or Encharge
- ›Dedicated IPs are tied to higher-volume Professional accounts
Mailchimp / Mandrill
- ›Recognizable brand
- ›Mature template editor
- ›Large agency ecosystem
- ›Three disclosed security incidents in the twelve months to January 2023, the last via social engineering of staff
- ›Mandrill only available as a paid add-on
- ›API ergonomics feel dated
- ›Pricing opacity