Every free SOP checker is a funnel to the paid plan. That is fine. The question is whether the paid plan is worth it.
- Free tiers cover spelling, core grammar, punctuation, about eighty percent of the value - Run every draft through a free tier before any human sees it, non-negotiable - Paid adds style suggestions and tone analysis, useful, but you will use it for two weeks, so pick monthly billing, never annual - Time the free trial for your final revision week and cancel like you mean it - The hard limit: checkers grade sentences, not stories, nobody's motivation ever sounded generic to a grammar tool
Free checker on every draft, one paid month during finals if sane, then a human. And for tailoring to a specific university, SOPCraft builds that draft for two programs for $4.99. Simple rules.