The marketing stack has grown from email and CRM to include CDPs, data warehouses, product analytics, payment systems, helpdesks, and ad platforms. Selecting marketing automation on the strength of its integration ecosystem has become the dominant criterion for buyers in 2026. This ranking compares the 8 platforms with the deepest integration breadth, native partner programs, and reverse-ETL support against modern data infrastructure.
Integration evaluation should look past raw partner counts to native versus middleware, two-way versus one-way sync, and the operational maturity of each critical connection. A marketing automation platform listed with 1,500 integrations may have only 50 that meet enterprise-grade two-way sync standards.
Native versus middleware matters because middleware (Zapier, Workato, Make) adds latency, failure modes, and per-task billing. Critical connections — CRM, ecommerce, support, data warehouse — should be native or via a vendor-supported connector. Two-way sync is non-negotiable for CRM and ecommerce; one-way connections force operators to reconcile contact and order data manually.
Reverse-ETL support has become the dominant new requirement: buyers running Snowflake, Databricks, BigQuery, or Redshift expect to model audiences in the warehouse and sync them to MA. Customer.io, Braze, and Iterable lead on this; HubSpot and Salesforce have caught up via Hightouch, Census, and native Data Cloud paths. For wider context, see the marketing automation directory, the CDP category, and our best CDP for enterprise ranking.
| Product | Integration count | Reverse-ETL | Rating | Starting price |
|---|---|---|---|---|
| HubSpot Marketing Hub | 1,500+ | Via Hightouch/Census | 4.4 | $20/mo |
| Salesforce Marketing Cloud | 3,000+ (AppExchange) | Native (Data Cloud) | 4.0 | $1,250/mo |
| Adobe Marketo Engage | 700+ (LaunchPoint) | Via partners | 4.1 | $1,250/mo |
| Braze | 250+ certified | Native (CDI) | 4.5 | $60,000/yr |
| Customer.io | 200+ + webhooks | Native | 4.5 | $100/mo |
| Klaviyo | 350+ | Native (KDP) | 4.6 | $45/mo |
| Iterable | 180+ | Native | 4.3 | Custom |
| ActiveCampaign | 900+ | Via partners | 4.5 | $15/mo |