Comparison

21 Letters vs Ace Tower Card Puzzle

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

Head to head
About

21 Letters

A daily word game where you build connecting words to achieve a high score. Compete with friends and family using the same daily set of letters. The game ends when you run out of letters or can no longer form words.

Highlights
  • Daily word challenges
  • Connecting word building
  • High score tracking
  • Friend and family competition
  • Unique daily letter sets
Features
Read full description

21 Letters every day. Build connecting words and score as high as you can. Once you run out of letters, or can't make any more words, your daily round is over. Share your score with your friends and family - since everyone has the same letters for any given day, every day is a competition!

About

Ace Tower Card Puzzle

Features
Read full description

Ace Tower is a strategic card puzzle that is easy to learn and hard to master. Every floor is a small board of cards laid out in rows. Drag one card onto another to swap them. Any two cards, any rows. Each row scores as a combo, from a simple PAIR all the way up to an ACE RUN. Find the right swaps, reach the stars, and chase MAX, the perfect score of the floor. CLIMB THE TOWER 100 hand-crafted floors, from gentle first steps to puzzles that will really make you think. Every floor has three stars and one perfect score to beat. MASTER 9 COMBOS PAIR, 2+2, TRIPLE, RUN, SUIT, 3+2, FOUR, SUIT RUN and ACE RUN. Stronger combos and higher cards earn more points. A NEW CHALLENGE EVERY DAY Three fresh boards every day, the same for every player. Reach MAX in the fewest swaps and climb the daily leaderboard. Keep your daily streak alive. DUEL IN THE ARENA Play the same board as another player, at your own pace. Best score wins. Climb the leagues from Bronze to Diamond. HELP WHEN YOU NEED IT Stuck on a floor? Light up the row to work on, see the next swap, or watch the full solution. A PURE PUZZLE GAME Ace Tower is a skill puzzle. There is no gambling, no betting, no real-money play and no cash prizes. Coins are an in-game currency for hints and extras only and have no cash value. Free to play. Optional in-app purchases (coins, Remove Ads). The game shows ads between floors, which can be removed with a one-time purchase. Available in English, Spanish, Portuguese, French, German and Filipino.

Screenshots

21 Letters4 screens
Ace Tower Card Puzzle4 screens

Verdict

The call

The clearest difference is in-app purchases: Ace Tower Card Puzzle at none against 21 Letters's 6. Ace Tower Card Puzzle also leads on ads (none vs shown). 21 Letters's advantage is update cadence (every 2 days vs every 2 months) and iOS requirement (12.0 vs 15.0). On price and device support 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. 21 Letters sells 6 one-off in-app purchases. Ace Tower Card Puzzle asks for nothing beyond the download.

UpkeepUpdate frequency

21 Letters ships an update every 2 days, Ace Tower Card Puzzle every 2 months. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

Scorecard4 real differences · 6 level
21 Letters versus Ace Tower Card Puzzle: the parameters behind the verdict, then further details
Parameter21 LettersAce Tower Card Puzzle
PriceFreeFree
Rating4.7 (64 ratings) — better—
Positive reviews81.8% of reviews—
Number of ratings64 — better—
Update frequencyEvery 2 days — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size106 MB89 MB
Age rating4+12+
DeveloperShallot Games, LLC.Ophir Atar

In-app purchases

6 purchases

21 Letters

One-time6
  • August 2024 Ad-Free$2.99
  • September 2024 Ad-Free$2.99
  • October 2024 Ad-Free$2.99
Show 3 more
  • May 2024 Ad-Free$2.99
  • June 2024 Ad-Free$2.99
  • July 2024 Ad-Free$2.99
None

Ace Tower Card Puzzle

No in-app purchases

Questions

Is 21 Letters free?
21 Letters is free to download, with in-app purchases available.
Is Ace Tower Card Puzzle free?
Ace Tower Card Puzzle is free to download, with no in-app purchases.
Do 21 Letters or Ace Tower Card Puzzle have ads?
21 Letters shows ads; Ace Tower Card Puzzle does not.
Which is updated more often, 21 Letters or Ace Tower Card Puzzle?
21 Letters ships an update every 2 days, and Ace Tower Card Puzzle every 2 months. Most recently, 21 Letters was updated on October 7, 2026 and Ace Tower Card Puzzle on October 14, 2026.

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