The best replacement for visualizer is verbalizer.

The best alternatives to visualizer are rated as following:
★★★★★  verbalizer
★★  visualiser

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Speaking about visualizer, one probably shouldn't forget about pandora.

Other search terms related to visualizer and their ratings are:
★★★★★ pandora
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Google Trends

Scale is based on the average worldwide traffic of visualizer in all years. Click on graph for more.
visualizer
verbalizer
visualiser