Comparison

Gamebook Engine vs WhatChanged

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

Head to head
About

Gamebook Engine

Features
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Gamebook Engine is an all-in-one app for creating and reading gamebooks, a type of interactive fiction where the player's choices influence the outcome of the story. With Gamebook Engine you can: β€’ Create gamebooks - Write interactive choosable path adventure stories using a thoughtfully designed interface β€’ Share gamebooks - Gamebooks export to a plain text ".gbook" file that you can send to your friends via email, text message, or carrier pigeon (if the story is very short) β€’ Play gamebooks - Gamebook Engine can import and play ".gbook" files, which contain the data for interactive stories What makes Gamebook Engine special? β€’ Attributes can make gamebooks dynamic: Attributes can be used to track changes in inventory, player stats, NPC relationships, and much more. This makes Gamebook Engine stories a little more dynamic than a classic paperback choosable path story. β€’ Warning, nerd talk: Gamebooks export to plain-text JSON, not a proprietary file-type, so you can easily share them as privately or publicly as you want, and anyone can build a client for reading them -- but why bother when Gamebook Engine is a reader already! β€’ Total Privacy: Gamebook Engine has no online services or accounts. Gamebook Engine runs entirely on your device and never sends any data about you or what you are writing to anyone. Your privacy is totally and absolutely guaranteed. Your writings only leave your device when you share them with someone.

About

WhatChanged

Features
Read full description

WhatChanged is a file and folder comparison app built to answer one practical question: what changed between these two copies? Compare two files or two folders on iPhone, iPad, and Mac and get a clear summary of added, removed, modified, renamed, and identical items. Use optional SHA-256 verification when metadata alone is not enough. On iPhone and iPad, start inside the app or send exactly two files from Files straight to WhatChanged. It is useful for backups, exports, cloud-drive copies, builds, and any β€œdid this transfer match?” check. β—Ό File and folder comparison β€’ Compare two files or two folders as Left and Right β€’ Review added, removed, modified, renamed, and identical items β€’ Use smart ignore rules for hidden items, extensions, names, and patterns β€’ Ignore line-ending or whitespace-only changes when appropriate β€’ Preview supported files, keep recent comparisons, and export or share reports β€’ Verify content with optional SHA-256 and cached re-checks β€’ Use the app in 25 languages, with an optional in-app language override β—Ό From the share sheet In Files, or another app that can share files, select exactly two files. Tap Share β†’ WhatChanged. The comparison opens automatically. Tip: The extension is intended for file-to-file comparison. To compare folders, open the main app. β—Ό Safe Merge Run a folder comparison, open Safe Merge, and choose a main rule: Newest, Oldest, Smallest (New), Smallest (Old), Biggest (New), or Biggest (Old). The Safe Merge Assistant shows selected items, recommendations, conflicts, blocking issues, output details, and safety checks before anything is copied. For individual output paths, you can keep the main Merge Rule or choose Left or Right. Recommended continues to show what the main rule would choose, while Selected shows what will actually be copied. The β€œ+ Custom” indicator appears whenever exceptions are active. WhatChanged recalculates the plan and verifies it again before copying. Custom merges use a clearly named output folder, such as β€œSafe Merge by WhatChanged (Newest + Custom).” Successful merges include a generated README describing the compared folders, main rule, custom selections, copied items, output paths, counts, and safety notes. β—Ό Quick text checks Use Direct Text Compare, supported text files, or folder-pair text results for convenient text checks. Copy a unified-diff-style result, search with Find in Diff, move between matches, highlight rows, and review Diff Summary counts. These text tools are included for quick comparison inside a file-and-folder utility. WhatChanged is not designed as a full drafting workspace. β—Ό Looking for a dedicated text workspace? DiffDraft is designed specifically for comparing text versions and composing a clean final draft in a row-aware workspace. Source rows, draft rows, manual rows, and intentional gaps stay visually aligned, helping long reviews remain stable and trustworthy while you cherry-pick, edit, and continue later. View DiffDraft on the App Store: https://apps.apple.com/us/app/diffdraft/id6779625050 β—Ό Safe by design WhatChanged does not modify or delete your originals. Comparisons are read-only. Safe Merge writes only to a new output folder after you confirm the merge and every required safety check passes. β—Ό Official website Product information, support, privacy details, and terms are available here: https://hazybyte.studio/whatchanged/ Requires iOS 16.6 or later. Terms of Use: https://hazybyte.studio/whatchanged/terms-of-use/

Screenshots

Gamebook Engine4 screens
WhatChanged4 screens

Verdict

The call

The clearest difference is price: Gamebook Engine at $4.99 against WhatChanged's $9.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Gamebook Engine costs $4.99 and WhatChanged $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference Β· 5 level
Gamebook Engine versus WhatChanged: the parameters behind the verdict, then further details
ParameterGamebook EngineWhatChanged
Price$4.99 β€” better$9.99
Update frequencyβ€”Every 3 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.6 β€” better16.6
Further details β€” not scored
Size3 MB31 MB
Age rating4+4+
DeveloperBrad RootIri You

In-app purchases

None

Gamebook Engine

No in-app purchases

None

WhatChanged

No in-app purchases

Questions

Is Gamebook Engine free?
Gamebook Engine costs $4.99, with no in-app purchases.
Is WhatChanged free?
WhatChanged costs $9.99, with no in-app purchases.
Do Gamebook Engine or WhatChanged have ads?
Neither Gamebook Engine nor WhatChanged shows ads.

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