Comparison

Zotz! vs Play 21

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Zotz!

This game offers a unique perceptual challenge, training your brain and eyes with a simple card-matching mechanic. Customize colors, fill types, and card layouts to your preference. Enjoy a pressure-free experience with no timer or score.

Highlights
  • Perceptual practice
  • Brain and eye training
  • Customizable attributes
  • No timer or score
  • Simple card challenge
Features
Read full description

Zotz! is an enjoyable time-waster, a form of perceptual practice, good for training the brain and the eyes; there is no timer and no score, no pressure, just a simple challenge waiting for you whenever you like. The game supposes a deck of cards, where each card has four attributes, and each attribute on any given card has one of three possible values: Number (one, two, or three), Color (red, blue, or green), Fill (solid, hazy, or empty), and Shape (diamond, oval, or rectangle). All you have to do is to spot, amongst the visible cards, any three cards which, for each attribute, are either all identical or all different. Colors, middle fill type, and number of cards in the layout can all be customized. Full instructions, with examples, are included.

About

Play 21

A skill-based card game combining blackjack and solitaire mechanics. Compete against real players for cash prizes by strategically reaching a total of 21. Sharpen your card counting abilities and earn rewards.

Highlights
  • Real money prizes
  • Blackjack and solitaire blend
  • Skill-based competition
  • Fair matching against players
  • Leaderboard climbing
  • Redeemable tickets for rewards
Read full description

The cards are shuffled, the dealer is ready! It's time to Play 21! The top mobile card game that you can play for real money prizes! Play 21 is the perfect mix of blackjack and solitaire. Take your blackjack skills from the casino floor to your phone with this fast-paced card game. Count the cards, track the aces and the faces and stack hands to hit the total of 21. Doubledown on your card game IQ against real competitors, playing for REAL CASH PRIZES. Like solitaire, it’s all about the order of the cards and figuring out if the card you need is about to come! All combinations of cards count, from a casino blackjack to 5 card runs, just don't exceed 21! The quicker you play the more points you earn and you can take home the cash with a winning score! If you love poker, solitaire, blackjack and classic card games like rummy then Play21 is the game for you! It can sharpen your card counting skills and improve your real blackjack game. Start playing for free, perfect your strategy and then play for real cash! With Play 21 you're not playing against the house, so if you make the right decision you can always win! Play 21 is a skill based competition game, powered by Skillz®. Here, fairplay rules and every player has a chance to achieve an epic win, no matter your level of ability. • Win cash bonuses with Skillz® Daily Challenges! • Get fairly matched against real players that match your skill level! • Earn medals to climb the leaderboard and win real cash prizes. • Get tickets every time you play. Redeem your tickets for real world rewards in the Skillz® Rewards Store including gift cards, jewelry and even brand new cars! If you have any questions about the Skillz platform please contact: support@skillz.com

Screenshots

Zotz!1 screens
Play 214 screens

Verdict

The call

The clearest difference is ads: Zotz! at none against Play 21's shown. Zotz! also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.7). Play 21's advantage is review sentiment (88% vs 67%) and ratings volume (128 vs 4). On price and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Zotz! holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Play 21 has 128 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 67% of Zotz!'s written reviews are positive against 88% of Play 21's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Zotz! ships an update every 11 months, Play 21 every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard8 real differences · 2 level
Zotz! versus Play 21: the parameters behind the verdict, then further details
ParameterZotz!Play 21
PriceFreeFree
Rating5.0 (4 ratings) — better4.7 (128 ratings)
Positive reviews66.7% of reviews87.5% of reviews — better
Number of ratings4128 — better
Update frequencyEvery 11 monthsEvery 4 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS26.012.0 — better
Further details — not scored
Size4 MB179 MB
Age rating4+17+
DeveloperMatt NeuburgFoxpaint AB

Customer experience

Zotz!

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Play 21

All ratings126 ratings
Positive94.4%
Neutral3.2%
Negative2.4%
Written reviews16 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

In-app purchases

None

Zotz!

No in-app purchases

None

Play 21

No in-app purchases

Questions

Is Zotz! free?
Zotz! is free to download, with no in-app purchases.
Is Play 21 free?
Play 21 is free to download, with no in-app purchases.
Which has better reviews, Zotz! or Play 21?
Zotz! is rated higher. Zotz! averages 5.0 out of 5 from 4 ratings, while Play 21 averages 4.7 from 128 ratings.
Do Zotz! or Play 21 have ads?
Play 21 shows ads; Zotz! does not.
Which is updated more often, Zotz! or Play 21?
Zotz! ships an update every 11 months, and Play 21 every 4 months. Most recently, Zotz! was updated on November 1, 2026 and Play 21 on November 3, 2026.

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