If you're a Shopify App you may not know this formula and yet it impacts you:
Score = ln(1 + D) + 1.34 × ln(1 + K) + 0.87 × F + 0.66 × r + 0.32 × ln((1 + M30) / (1 + M365)) + 0.21 × ln(age) − 0.11 × ln(1 + R) − 0.32 × B + 0.10 × u
So what is it?
It's a formula that gives almost perfectly the top-20 of categories
D = Review activity score. For every day the app received at least one review, add 0.5^(days_ago / 120). A review-day today adds 1, one 120 days ago adds 0.5, and one 240 days ago adds 0.25.
K = Number of keywords for which the app ranks on page 1 today, meaning the top 24 results.
F = Free-plan indicator: 1 if the app has a free plan, otherwise 0.
r = Current star rating, for example 4.9.
M30 / M365 = Review momentum ratio. Both are calculated like D, but using 30-day and 365-day decay periods. The ratio measures whether the app is receiving reviews faster recently than its longer-term baseline.
age = Number of days since the app launched.
R = Total lifetime review count.
B = Built for Shopify indicator: 1 if the app has the Built for Shopify badge, otherwise 0.
u = Fraction of recent reviews written by merchants who had been using the app for less than 30 days.