[mboelen]

At our company (CISOfy) we created a solution around our existing open source project Lynis (https://github.com/CISOfy/lynis). This way the tool in itself provides value, yet the separate Enterprise offering as well. Lynis itself is useful for a single system, yet companies might be attracted by Enterprise features (like collecting all data centrally, dashboards, reports, compliance reporting).

A similar way might work for your web application, by making two different products, each with their own audience.

My tip as founder: start testing the viability of your product/business first. Consider the reasons why people would or would not pay. Ask people in your field who might use it and if they would be willing to pay (and how much).