Comparison

Serendipity Chess vs Opening Prep

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

Head to head
About

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.

About

Opening Prep

Features
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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

Serendipity Chess4 screens
Opening Prep4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences · 4 level
Serendipity Chess versus Opening Prep: the parameters behind the verdict, then further details
ParameterSerendipity ChessOpening Prep
PriceFreeFree
Update frequencyEvery 3 weeksEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.6 — better
Further details — not scored
Size67 MB5 MB
Age rating4+4+
DeveloperMingo LamRoman Bogatenko

In-app purchases

None

Serendipity Chess

No in-app purchases

None

Opening Prep

No in-app purchases

Questions

Is Serendipity Chess free?
Serendipity Chess is free to download, with no in-app purchases.
Is Opening Prep free?
Opening Prep is free to download, with no in-app purchases.
Do Serendipity Chess or Opening Prep have ads?
Neither Serendipity Chess nor Opening Prep shows ads.
Which is updated more often, Serendipity Chess or Opening Prep?
Serendipity Chess ships an update every 3 weeks, and Opening Prep every 4 days. Most recently, Serendipity Chess was updated on October 25, 2026 and Opening Prep on October 28, 2026.

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