The platform split matters less than the maintenance split. The math is trivial on both, and what differs is which apps keep their tables current. People argue about the wrong split. - iOS: prettier apps, more developers willing to charge a few dollars, better survival odds for niche reference tools. That is about the whole advantage. Small, but real. - Android: more free options, more non-US developers covering their own regions well, widgets on the home screen. The tradeoff is curation: sort by recent reviews, ignore the walls of generic five-star praise. - On both, the evaluation is identical: year-effective dates, headline vs SME vs effective rates, named source, updated this year. Fail one and it is a toy. - And the honest caveat: a calculator answers the arithmetic, not the question. Your entity type and thresholds decide which rate applies. Compare against a table that shows its year and its work. IncorpTrack's is free, and the UK/Singapore registration service is $49 plus the government fee.