Every B2B integration page says "connect in minutes". Almost none of them tell you the connection requires a plan tier that costs 4× your current one.
So I spent the last few weeks auditing the official pricing pages and developer docs of 20 popular B2B tools, and built StackMatrix — a free, open index of what integrations actually cost: https://stackcostmatrix.com
What each of the 55 pair pages includes
- An interactive True Cost of Ownership calculator (team-size slider, required-tier toggle, "I already pay for both apps" incremental mode)
- The hidden cost trap: the exact tier gate, API add-on, or webhook paywall behind the "free integration" claim
- A spec matrix (native vs API-only, sync direction, webhooks at the required tier)
- Native vs middleware (Zapier/Make) total cost, compared honestly
Deep dives
- HubSpot ecosystem cost matrix: https://stackcostmatrix.com/hubspot-integrations-cost/
- Salesforce ecosystem cost matrix: https://stackcostmatrix.com/salesforce-integrations-cost/
- CRM integration pricing guide (native vs Zapier/Make across CRMs): https://stackcostmatrix.com/crm-integration-pricing-guide/
Calculators worth trying
- HubSpot + Slack — the $20/seat trap hiding behind a "free" integration: https://stackcostmatrix.com/stack/hubspot-and-slack/
- Salesforce + Stripe — including the $25/user API add-on nobody mentions: https://stackcostmatrix.com/stack/salesforce-and-stripe/
- Pipedrive + Xero: https://stackcostmatrix.com/stack/pipedrive-and-xero/
Open by default
The dataset is public and source-linked (every figure traces to an official vendor pricing page or developer doc): https://github.com/rakeshrkrk56-sketch/stackmatrix
Feedback welcome — especially corrections. Every price is re-verified against live vendor docs, and mismatches get flagged, never silently rewritten.
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