Reasoning
Across five sources (Trustpilot, PCMag, Software Advice, Research.com, OnePageCRM), each treated as a single opinion per domain, the dominant assessment of Bigin's learning curve is that it is easy to learn. While some sources mention 'Very Easy', 'no learning curve', or 'steep', these are outvoted by the majority which use 'low' (or equivalent). Normalizing to a single canonical value yields 'low'.