Serendipity Chess vs Opening Prep
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Serendipity Chess
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This variant is similar to standard chess. All the chessmen is the same as standard chess’ rules. The only one objective in this game is to locate the real opponent King and capture him. No matter how strong a chess player your opponents are in standard Chess Game, this game will make thing interesting so that you can stand a chance of victory! This is a true fair game.
Opening Prep
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Opening Prep: Chess Trainer is a chess opening trainer for studying and memorizing chess openings from your own PGN repertoire. Import PGN files or paste PGN text, organize your opening repertoire, and train chess lines move by move directly on the board. Opening Prep: Chess Trainer is built for focused opening preparation, repertoire study, and fast memorization of opening variations. Train as White, Black, or both sides, review repertoire trees, continue previous training sessions, and improve difficult positions with targeted repetition. Perfect for tournament preparation, online chess, and daily opening practice. Features • Import chess repertoires from PGN files • Paste PGN text directly into the app • Train chess openings as White, Black, or both • Practice opening lines move by move • Continue previous training sessions anytime • Continue training for a specific repertoire • Study repertoire trees and branching variations • Preview repertoire lines before training • Autoplay repertoire variations on the board • Tap moves in notation to jump to any position • Track mistakes, accuracy, and training streaks • Train difficult positions and weak opening lines • Quick actions for new sessions and hardest positions • Optional move sounds and haptic feedback • Works fully offline with local storage • No account required Opening Prep: Chess Trainer is a lightweight PGN repertoire trainer designed for serious chess opening preparation without unnecessary complexity.
Screenshots
Verdict
The clearest difference is update cadence: Opening Prep at every 4 days against Serendipity Chess's every 3 weeks. Opening Prep also leads on iOS requirement (16.6 vs 18.0). On price, ads, 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. Neither carries in-app purchases, so what you see is what you pay.
Serendipity Chess ships an update every 3 weeks, Opening Prep every 4 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.
| Parameter | Serendipity Chess | Opening Prep |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 16.6 — better |
| Further details — not scored | ||
| Size | 67 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Mingo Lam | Roman Bogatenko |
In-app purchases
Serendipity Chess
No in-app purchases
Opening Prep
No in-app purchases
Questions
Is Serendipity Chess free?
Is Opening Prep free?
Do Serendipity Chess or Opening Prep have ads?
Which is updated more often, Serendipity Chess or Opening Prep?
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