Search Trends 2.0 is a free tool to discover exploding or tanking keywords, niches and industries, based on Year over Year data to uncover shifts in demand. New UI, faster results.
Search Trends after COVID by SEOmonitor
Search Trends is a free tool to identify exploding and tanking trends by industries, niches and keywords / topics, using Year over Year data to highlight actual shifts in demand (April 2020 versus April 2019).