People use "certified integration" as shorthand, but the certification does not live on the connection. It lives on the apps installed at each end.
A certified Salesforce-NetSuite setup means using apps that have each passed independent vendor review on their own platform: Salesforce's AppExchange Security Review on one side, NetSuite's SuiteApp certification program on the other. A custom integration means a connection someone built and reviewed once, with no standing obligation to either vendor and no ongoing retesting when either platform changes. That is the core difference.
Both reviews repeat with every major platform release. That difference matters most after a Salesforce or NetSuite release ships. A custom integration has to be manually re-checked against whatever changed, usually by whoever maintains it internally or the contractor who originally built it. If that person has left, the first step is reconstructing how the integration was wired before anyone can diagnose what broke. A certified app is tested against new releases by the vendor itself, before customers ever encounter them.
Holding certification on both platforms is also a different claim than holding it on one. An app certified only by Salesforce still has no NetSuite vendor review behind it. An app certified only by NetSuite has no Salesforce vendor review. Two separate certifications mean two independent review chains: Salesforce confirming the app behaves correctly inside its platform, NetSuite confirming the same on its side.
The gap between the two approaches compounds with deal complexity. A flat, one-time sale barely stresses either. Add ramps, usage components, or mid-term amendments, and every new deal shape becomes a new edge case a custom build has to absorb manually. A certified app carries that logic already, verified independently rather than patched onto a codebase over time.
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Frequently asked questions
What does "certified integration" actually mean for Salesforce and NetSuite?
The certification belongs to the apps installed on each platform, not to the connection itself. A certified Salesforce-NetSuite setup uses apps that have each passed independent vendor review: Salesforce's AppExchange Security Review on one side, NetSuite's SuiteApp certification program on the other. Both reviews repeat at every major platform release, not just at initial launch.
Is holding AppExchange certification the same as holding SuiteApp certification?
No. They are two separate reviews conducted by two separate vendors. AppExchange certification confirms the app meets Salesforce's standards inside its platform. SuiteApp certification confirms it meets NetSuite's. Holding both means both platforms have independently reviewed and accepted the product, on an ongoing basis.
Is a custom integration cheaper than using certified apps?
Often only upfront. A custom build carries no license fee at the start, but accumulates cost through ongoing maintenance, knowledge loss when the original builder moves on, and manual re-verification after every platform update on both sides.
What happens to a custom integration when Salesforce or NetSuite updates?
Someone has to manually check whether the update broke a dependency, then patch it. Certified apps are tested against each new release by the platform vendor before the release reaches customers.