| Salesforce | Bidirectional | Contacts, accounts, opportunities, campaign influence and closed-won records | The commonest mid-market shape: marketing runs in HubSpot, the sales org of record stays in Salesforce. Field-level ownership is assigned per field, not per object, so neither side overwrites the other. |
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| HubSpot Marketing Hub | Shared records | Lifecycle stage, campaign membership, form submissions, email and page engagement | No integration exists here — both hubs read the same contact and company records. That is the structural advantage, and it only pays off if lifecycle stages are defined once for both sides. |
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| NetSuite · QuickBooks | Bidirectional | Closed-won deals and line items outbound; invoice and payment status inbound | Closes the loop between booked and collected, so pipeline reporting and finance stop disagreeing about what a quarter was worth. |
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| Slack · Microsoft Teams | Outbound | Stage-change alerts, high-value deal notifications, stale-deal nudges, approval requests | Puts pipeline events where the team already works, which is what converts a discount approval from a two-day wait into a two-minute one. |
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| Google Workspace · Microsoft 365 | Bidirectional | Calendar availability, email threads, meeting outcomes and attachments | Activity logging that reps do not have to think about. Unlogged activity is the single largest cause of a pipeline that looks healthier than it is. |
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| Looker Studio · BI layer | Outbound | Pipeline snapshots, velocity history, forecast-versus-actual series | HubSpot reports the present well and history less well. Exporting snapshots is how forecast accuracy becomes a trend rather than an anecdote. |
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| Zapier · Workato · Celigo | Bidirectional | Long-tail systems with no native connector — provisioning, support, billing and internal tools | Used deliberately for low-volume, low-risk edges. Anything carrying revenue-critical data gets a designed sync instead, because iPaaS error handling is not a substitute for one. |
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