Some seem to supplement developers (eg: retool) and some empower non-engineers to be able to build websites/apps/integrations without necessarily having a developer in the loop (eg: shopify/zapier/airtable).
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No-code takes out engineers, moving parts, and SLoC from the equation (as far as the enterprises buying these solutions are concerned), but leaves a lot to be desired in terms of feature set; low-code brings down number of engineers, and SLoC, whilst providing flexibility in terms of bespoke feature sets.