$BL (BlackLine) and $WK (Workiva): Balancing Growth and Profitability in Cloud Accounting Software BL (BlackLine) is growing revenue in the high single digits, while WK (Workiva) is growing at a roughly 19% annual rate. BlackLine generates stronger profitability today, with a non-GAAP operating margin above 23%, versus Workiva's mid-to-high teens. Workiva is scaling past the $1 billion annual revenue mark with improving margins, while BlackLine is navigating a slower-growth transition toward platform and AI-based pricing. Both companies face elongated enterprise sales cycles as buyers scrutinize AI, security, and governance requirements more heavily.