21 Letters vs Neutralize +
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Daily word challenges
- Connecting word building
- High score tracking
- Friend and family competition
- Unique daily letter sets
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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!
Neutralize +
A minimalist puzzle game where you swipe tiles to combine opposites, creating neutral spaces to clear the board and increase your score. It offers strategic depth with a focus on chain reactions and a clean, glassmorphic design for an endless challenge.
- Swipe to combine opposite tiles
- Create neutral spaces
- Strategic chain reactions
- Minimalist glassmorphic design
- Endless scoring challenge
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Neutralize is a chill but perplexing puzzler. Swipe tiles to combine positive and negative tiles to create neutrals. Can you neutralize the entire board? Features: - A New Mechanic: A unique tile sliding mechanic distilled to its essence. - Deep Strategy, Simple Rules: Plan your moves carefully — like playing chess against yourself. - Play Your Way: Easy to play for 30 seconds or 30 hours. - One-Handed Comfort: Portrait mode and smooth swipe controls mean you can play anywhere, anytime, one-handed. - Beautiful Design: Meticulous attention to detail with beautiful light and dark themes. - Track Your Progress: Comprehensive stats to evaluate and improve your skills. - Master the Board: Earn achievements on your journey to Full Neutrality.
Screenshots
Verdict
The clearest difference is rating: 21 Letters at 4.7 against Neutralize +'s 4.2. 21 Letters also leads on update cadence (every 2 days vs every 3 weeks) and ratings volume (64 vs 5). Neutralize +'s advantage is ads (none vs shown) and review sentiment (100% vs 82%). On price, in-app purchases 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
Both are free to download. 21 Letters sells 6 one-off in-app purchases and Neutralize + sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
21 Letters holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: 21 Letters has 64 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 82% of 21 Letters's written reviews are positive against 100% of Neutralize +'s, so the app with the better star average is not the one people write more warmly about.
21 Letters ships an update every 2 days, Neutralize + every 3 weeks. The most recent releases landed on September 15, 2026 and June 3, 2026 respectively.
| Parameter | 21 Letters | Neutralize + |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (64 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 81.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 64 — better | 5 |
| Update frequency | Every 2 days — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 106 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Shallot Games, LLC. | Air Pie LLC |
Customer experience
21 Letters
Neutralize +
In-app purchases
21 Letters
- August 2024 Ad-Free$2.99
- September 2024 Ad-Free$2.99
- October 2024 Ad-Free$2.99
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- May 2024 Ad-Free$2.99
- June 2024 Ad-Free$2.99
- July 2024 Ad-Free$2.99
Neutralize +
- Neutralize Forever$2.99
