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Four By 21 icon

How much does Four By 21 earn?

Android app from Words and Maps · Card

ML forecast ★ 4.1 · 350 Free

~351/mo

ML revenue forecast. Calibrated against 5756 apps in this category.

Confidence band
±15%
High — many comparable apps with verified data

At a glance

What the app looks like

Live screenshots from the Play Store, captured by our snapshot worker. Tap any image to enlarge.

Four By 21 screenshot 1 Four By 21 screenshot 2 Four By 21 screenshot 3 Four By 21 screenshot 4

Four By 21's revenue trajectory

Forecast revenue from snapshot history. Last 1 months.

Where Four By 21 sits in Card

Revenue distribution of 5756 comparable apps. Four By 21 highlighted.

Four By 21 vs comparable apps

Revenue trajectory side-by-side. Bold = Four By 21, ghosted = peers.

App spec

Version
7.0
Last update
Aug 23, 2025
Launched
Sep 26, 2012
Price
Free
Monetization
Free

What Four By 21 actually does (from store listing)

Four By 21: Solitaire meets Blackjack in this fast-paced single-player game. You are dealt one card at a time. Choose one of the four stacks to place the card. When the card values in a stack add up to exactly 21, that stack is cleared and you will score a point. If a stack value is over 21, that stack is busted. The game is over if you bust 5 times, or run out of time on the clock. Bonus points are given for consecutive stacks cleared. Brought to you by the makers of Pressed For Words!

Comparable Android apps

The five apps in Card with the closest revenue to Four By 21. Click any to see its detail page.

AppRevenueRatingRatings
Spiderette Solitaire icon Spiderette Solitaire 351 ★ 4.2 346
Golf Solitaire Classic icon Golf Solitaire Classic 351 ★ 4.2 413
Suecalandia - Online games icon Suecalandia - Online games 351 — 0
Solitaire Lite icon Solitaire Lite 351 ★ 4.7 534
Ongdu - Khmer Card Game icon Ongdu - Khmer Card Game 351 — 0
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How we calculated this

Each forecast combines App Store rating, ratings count, monetisation model, pricing tier, IAP signals and ad-supported flag. The base estimate is then multiplied by a per-category scaling factor learned from apps with founder-verified MRR. Every number on this page comes from public APIs and bumetric's own snapshot history.

Full methodology covers input variables, accuracy bands per category and how we treat apps without comparable anchors. See also the live data on Four By 21's tracker page for current rating, reviews and snapshot timeline.

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