Comparison

Decodex vs SYSCALL

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

Head to head
About

Decodex

Engage in a modern take on classic cryptogram puzzles. Decipher quotes and enigma codes across diverse categories. Track your progress, build streaks, and enjoy a new challenge daily.

Highlights
  • 50+ puzzle categories
  • Daily enigma challenges
  • Intuitive user interface
  • Progress tracking and streaks
  • Substitution cipher gameplay
Features
Read full description

Step into a world of logic and ciphers. Decodex transforms classic cryptogram puzzles into a modern, addictive mobile experience. Whether you’re a fan of wordy challenges, a wordsearch enthusiast, or an enigma-solving veteran, our puzzles will sharpen your mind one quote at a time. If you enjoy the daily ritual of the NYTimes Games or the deep strategy of a crypto game, Decodex is your new favorite obsession. Key Features: - 50+ Categories: From Ancient Philosophy to Modern Wit. - Daily Enigmas: A fresh substitution cipher every single day. - Intuitive UI: Designed for effortless logic-first play. - Track Your Progress: Earn stars, build streaks, and become a master codebreaker.

About

SYSCALL

Engage in a unique reverse-engineering and assembly optimization puzzle game set within a 1990s warez BBS. Write and debug assembly programs to crack software, patch code, and navigate a virtual network. Explore a private board with tools and community features.

Highlights
  • Reverse-engineering assembly puzzles
  • Code tracing and patching
  • Network hacking challenges
  • Virtual BBS environment
  • Assembly pixel art tool
  • Chip-tune maker
Features
Read full description

The mobile version of the SYSCALL: RING ZERO assembly puzzle game is here! This is our world now. The world of the electron and the switch. SYSCALL is a reverse-engineering and assembly optimization puzzle game inside a private 1990s warez BBS. You will be writing assembly programs, reading listings, tracing the machine, changing the code, and shipping the crack. READ THE CODE THAT RUNS Every CRACK release is a small SYSCALL CORE program. You are able to trace programs, inspect assembly instructions, get hints and watch registers move, in order to find the way to TRACE, CRACK and PATCH programs. FOUR WAYS TO HACK THE NETWORK CRACK: Read the listing, find the secret input key, and bypass the protection. PATCH: Fit the smallest fix into fixed edit slots, then run the test battery. WORM: Program a dynamic up to nine-core rack, route values across ports, and cut lines and cycles. SCOPE: Write firmware until the live trace locks onto the ghost signal. A PRIVATE BOARD WITH REAL TOOLS Dial in, pick a node on the NETWORK MAP, read the mail, check the notes, and work the releases. The board has PHILES that teach the SYSCALL CORE, crew messages, NFOs, greets, records, and side tools. CANVAS is a freeform assembly pixel toy. TRACKER is a four-channel chip-tune maker you can set as the board music.

Screenshots

Decodex4 screens
SYSCALL4 screens

Verdict

The call

The clearest difference is price: Decodex at Free against SYSCALL's $7.99. Decodex also leads on rating (5.0 vs 4.0) and update cadence (every 2 days vs weekly). SYSCALL's advantage is in-app purchases (none vs 4). On ads 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

Decodex is free to download; SYSCALL costs $7.99 up front. Decodex sells 4 one-off in-app purchases. SYSCALL asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Decodex holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

UpkeepUpdate frequency

Decodex ships an update every 2 days, SYSCALL weekly. The most recent releases landed on August 13, 2026 and September 28, 2026 respectively.

Scorecard7 real differences · 3 level
Decodex versus SYSCALL: the parameters behind the verdict, then further details
ParameterDecodexSYSCALL
PriceFree — better$7.99
Rating5.0 (3 ratings) — better4.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings3 — better1
Update frequencyEvery 2 days — betterWeekly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size19 MB17 MB
Age rating4+4+
DeveloperAron CsatlosChilling Moose

Customer experience

Decodex

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SYSCALL

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Decodex

One-time4
  • Extra Hints - Small Pack$0.99
  • Extra Hints - Big Pack$1.99
  • Decodex Premium$2.99
Show 1 more
  • Extra Hints - Ultimate Pack$4.99
None

SYSCALL

No in-app purchases

Questions

Is Decodex free?
Decodex is free to download, with in-app purchases available.
Is SYSCALL free?
SYSCALL costs $7.99, with no in-app purchases.
Which has better reviews, Decodex or SYSCALL?
Decodex is rated higher. Decodex averages 5.0 out of 5 from 3 ratings, while SYSCALL averages 4.0 from 1 ratings.
Do Decodex or SYSCALL have ads?
Neither Decodex nor SYSCALL shows ads.
Which is updated more often, Decodex or SYSCALL?
Decodex ships an update every 2 days, and SYSCALL weekly. Most recently, Decodex was updated on August 13, 2026 and SYSCALL on September 28, 2026.

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