| Price from | $13/mo | — |
| Free plan | Yes | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | — |
| Plans published | 5 | 1 |
| Spec score · Email marketing tools | 9.4 (#2) | 7.0 (#174) |
| Spec score · Email Marketing Software | 9.0 (#10) | 7.1 (#164) |
| A/B testing | Yes | Yes |
| Automation | Marketing Automation Flows automate campaigns and can contain up to 200 flows on higher plans. | PostUp supports customizable, behavior-led drip campaigns and automated customer journeys. |
| Email automation | Yes | Yes |
| Headquarters | Atlanta, USA | Greenwood, Indiana, United States |
| Integrations | Mailchimp advertises more than 300 integrations, including Shopify, WooCommerce, Canva, Zapier, Salesforce, WordPress, Stripe and QuickBooks Online. | PostUp describes turnkey integrations for CRM, CDP, audience development, reporting, CMS, and revenue generation platforms. |
| Security | Mailchimp says its SOC 2 reports cover security, availability and processing integrity, and it maintains ISO 27001 certification and a VPAT. | PostUp says its technical and organizational safeguards may include physical access controls, encryption, internet firewalls, intrusion detection, and network monitoring. |
| Audience segmentation | Yes | Yes |
