Comparison

ROT13 Decoder vs GrepEx

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

Head to head
About

ROT13 Decoder

Features
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ROT13 Decoder is a simple yet powerful text encoding/decoding tool that supports ROT13, ROT5, and ROT18 encoding methods. Whether you're performing simple text encryption or need to quickly decode ROT-encrypted content, this app makes it effortless. Key Features: 1. ROT13: Shifts letters by 13 positions 2. ROT5: Shifts numbers by 5 positions 3. ROT18: Shifts both letters and numbers simultaneously Why Choose Us: 1. Completely offline operation for privacy protection 2. Clean and intuitive interface 3. One-click result copying 4. Zero learning curve, ready to use instantly This lightweight yet practical tool puts powerful decoding capabilities right at your fingertips, making ROT-encoded text handling a breeze on your device.

About

GrepEx

Features
Read full description

GrepEx is the ultimate regex and dorking toolkit for developers, security researchers, and power users. Generate production-ready regular expressions in 22 programming languages and build precise search queriesβ€”all from your pocket. REGEX GENERATOR Stop wrestling with regex syntax. Select what you need to match, and GrepEx generates the pattern with language-specific code you can copy directly into your project. β€’ 22 Languages: JavaScript, Python, Go, Rust, Java, C#, PHP, Ruby, Swift, Kotlin, TypeScript, Perl, Bash, PowerShell, and more β€’ 80+ Templates: Email, URL, IP address, phone numbers, dates, credit cards, passwords, file paths, log parsing, and dozens more β€’ Live Testing: Paste sample text and see matches highlighted instantly β€’ Pattern Explanation: Understand what each regex component does in plain English β€’ Safe Testing: Built-in protection against catastrophic backtracking (ReDoS) SEARCH DORKING ENGINE Craft advanced search queries to find exactly what you're looking for. Perfect for research, competitive analysis, and discovering hard-to-find resources. β€’ Visual Query Builder: Combine operators like site:, filetype:, inurl:, intitle:, and intext: without memorizing syntax β€’ 3,600+ GHDB Templates: Access the GHDB with categorized, searchable dork patterns β€’ Smart Exclusions: Filter out noise with preset exclusion lists for cleaner results β€’ One-Tap Search: Open your crafted query directly in your browser BUILT FOR PRODUCTIVITY β€’ History & Favorites: Never lose a pattern you've created β€’ Export & Import: Back up your patterns and transfer between devices β€’ Dark Mode: Easy on the eyes during late-night coding sessions β€’ VoiceOver Support: Full accessibility for all users PRIVACY FIRST Your data never leaves your device. No accounts, no cloud sync, no analytics, no tracking. GrepEx works entirely offline for core features. GREPEX PRO Unlock unlimited potential: β€’ Save unlimited patterns and dorks β€’ Access all 22 programming languages β€’ Full GHDB search and save β€’ Extended history (100 items) β€’ Export/Import functionality Whether you're validating user input, parsing log files, scraping data, or conducting security research, GrepEx puts professional-grade tools in your hands. Download GrepEx and master regex today.

Screenshots

ROT13 Decoder4 screens
GrepEx4 screens

Verdict

The call

The clearest difference is price: ROT13 Decoder at Free against GrepEx's $1.99. GrepEx's advantage is update cadence (weekly vs every 8 months) and iOS requirement (13.4 vs 15.0). On ads, in-app purchases and device support 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

ROT13 Decoder is free to download; GrepEx costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ROT13 Decoder ships an update every 8 months, GrepEx weekly. The most recent releases landed on September 27, 2026 and October 7, 2026 respectively.

Scorecard3 real differences Β· 3 level
ROT13 Decoder versus GrepEx: the parameters behind the verdict, then further details
ParameterROT13 DecoderGrepEx
PriceFree β€” better$1.99
Update frequencyEvery 8 monthsWeekly β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.013.4 β€” better
Further details β€” not scored
Size16 MB12 MB
Age rating4+4+
Developer佳伟 θ”‘Jeremy Laratro

In-app purchases

None

ROT13 Decoder

No in-app purchases

None

GrepEx

No in-app purchases

Questions

Is ROT13 Decoder free?
ROT13 Decoder is free to download, with no in-app purchases.
Is GrepEx free?
GrepEx costs $1.99, with no in-app purchases.
Do ROT13 Decoder or GrepEx have ads?
Neither ROT13 Decoder nor GrepEx shows ads.
Which is updated more often, ROT13 Decoder or GrepEx?
ROT13 Decoder ships an update every 8 months, and GrepEx weekly. Most recently, ROT13 Decoder was updated on September 27, 2026 and GrepEx on October 7, 2026.

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