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StumbleUpon Widgets is leading in Top 100K Sites, Top 1M Sites and The Entire Web.
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In terms of market share, Flattr Button is clearly lagging behind, losing to StumbleUpon Widgets in all segments.
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StumbleUpon Widgets has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, Science & Education, News & Media and 19 other categories.
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Flattr Button is leading in Reference Materials.
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StumbleUpon Widgets is leading in most countries, including United States, India, United Kingdom, Italy and 125 other countries.
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Flattr Button is leading in Germany, Austria, Bahamas, Bermuda and 2 other countries.