Comparison

Calvin Chess Trainer vs PatternForge

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

Head to head
About

Calvin Chess Trainer

Features
Read full description

Master the chessboard from the ground up! Calvin Chess Trainer turns board fundamentals into engaging, hands-on drills designed for young learners. Chess Notation Trainer Learn files, ranks, and square names by tapping the board. Three modes let you progress at your own pace: Explore to discover, Practice to build confidence, and Speed Round to test your skills under a 30-second timer. Hear every square spoken aloud as you tap, reinforcing coordinate recognition through sight and sound. Move Trainer Read standard chess notation and find the correct move on an interactive board. Drag and drop pieces to solve 500 curated puzzles from the Lichess database. Incorrect? An arrow shows you where the piece should have gone so you learn from every attempt. Chess Vision Drills Build board visualization skills with four unique drills: Forks & Skewers — find the square where a piece attacks two targets at once Knight Sight — locate all squares a knight can reach in one jump Knight Flight — navigate a knight to a target in the fewest moves Pawn Attack — guide a piece through a field of enemy pawns to the other side Built for Kids Audio feedback on every tap — files, ranks, and piece names spoken clearly Streak counter with milestone celebrations at 5, 10, 15, and 20 Personal best tracking across every drill, mode, and difficulty Hard Mode flips the board to black's perspective for an extra challenge 25+ board themes and 28 piece sets to make it your own No ads. No in-app purchases. Just chess. Whether your child is just learning the names of the squares or sharpening their tactical vision, Calvin Chess Trainer makes every drill feel like a game. From Internut Education.

About

PatternForge

This app uses spaced repetition to help you master chess tactics. Solve puzzles adapted to your skill level, review them on a schedule, and import your own games to turn mistakes into training opportunities. Create custom puzzle sets to focus on specific patterns and improve your game.

Highlights
  • Spaced repetition training
  • Adaptive puzzle difficulty
  • Game import from Chess.com/Lichess
  • Custom puzzle sets
  • Theme-based training
  • Progress tracking
Read full description

PatternForge is a chess tactics trainer built around spaced repetition — so patterns actually stick instead of fading after one session. HOW IT WORKS 1. Train — Solve puzzles adapted to your level. Missed puzzles come back until you learn them. 2. Review — Patterns repeat on a schedule so you build automatic recognition. 3. Import — Pull your games from Chess.com or Lichess and turn your real mistakes into training. 4. Build — Create custom puzzle sets from PGNs, studies, or the full puzzle pool. FEATURES · Spaced repetition training · Adaptive puzzle difficulty (Glicko rating) · Game import from Chess.com and Lichess · Custom puzzle sets from PGNs and studies · Woodpecker method cycling · Theme-based training (forks, pins, skewers, and more) · Progress tracking and stats · Lichess puzzle database TRAINING MODES · Standard — Daily training with new and review puzzles · Woodpecker — Cycle through a set with increasing speed Stop grinding random puzzles. Start building real pattern recognition. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://patternforge.app/privacy

Screenshots

Calvin Chess Trainer4 screens
PatternForge4 screens

Verdict

The call

The clearest difference is in-app purchases: Calvin Chess Trainer at none against PatternForge's 2. Calvin Chess Trainer also leads on device support (3 vs 1). PatternForge's advantage is update cadence (every 2 days vs every 5 days). On price, ads and iOS requirement 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. PatternForge sells 2 in-app purchases, starting at $2.99 per month. Calvin Chess Trainer asks for nothing beyond the download.

UpkeepUpdate frequency

Calvin Chess Trainer ships an update every 5 days, PatternForge every 2 days. The most recent releases landed on September 15, 2026 and September 2, 2026 respectively.

Scorecard3 real differences · 7 level
Calvin Chess Trainer versus PatternForge: the parameters behind the verdict, then further details
ParameterCalvin Chess TrainerPatternForge
PriceFreeFree
Rating5.0 (1 ratings) — better
Positive reviews100.0% of reviews
Number of ratings1 — better
Update frequencyEvery 5 daysEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better16.4
Further details — not scored
Size215 MB58 MB
Age rating4+4+
DeveloperDAVID MARKLEZYAGA LLC

In-app purchases

None

Calvin Chess Trainer

No in-app purchases

2 purchases

PatternForge

Subscriptions2
  • Pro Monthly$2.991 Month
  • Pro Yearly$29.991 Year

Questions

Is Calvin Chess Trainer free?
Calvin Chess Trainer is free to download, with no in-app purchases.
Is PatternForge free?
PatternForge is free to download, with in-app purchases available.
Do Calvin Chess Trainer or PatternForge have ads?
Neither Calvin Chess Trainer nor PatternForge shows ads.
Which is updated more often, Calvin Chess Trainer or PatternForge?
Calvin Chess Trainer ships an update every 5 days, and PatternForge every 2 days. Most recently, Calvin Chess Trainer was updated on September 15, 2026 and PatternForge on September 2, 2026.

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