YouTubers pay monthly for screen recording, captions, clipping and scheduling before the channel earns a cent. One-time tools fix the cost of production at the price of a single video's ad revenue.
The tool this job usually means renting is AccuRanker, at $129/mo — roughly $1,548 a year, every year. Serpdeck does the job for a one-time $99 — running on infrastructure you control.