Backstory: We use VWO with most clients but it gets expensive, quick. Optimizely is another option but that product is also expensive. Google optimize 360? $150k per year.
The Idea: A split testing software that is between google optimize free and other $499 per month options.
Deep Dive: There's a definite gap in this market. You would need just enough significant features to beat out Google Optimize free to take a chunk out of the rest.
Validation: There are a large number of businesses in 250k-500k range that would benefit from a piece of split testing software priced in this range.
Monetization: You would probably have to charge between $49-$149 to differentiate yourself enough from the big ones to attract those right sized companies.