Comparison

CodeAB vs Protocol 4

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

Head to head
About

CodeAB

Test your logic and deduction skills in this addictive number puzzle game. Figure out the secret 4-digit code using hints after each guess. It's a fresh take on a classic puzzle, perfect for quick brain training.

Highlights
  • Deduction and logic gameplay
  • Secret 4-digit code challenge
  • Clues after every guess
  • No leading zeros or repeating digits
  • Quick brain training rounds
  • Classic Bulls & Cows style
Features
Read full description

What is the code? Who's on the first? What's on the second? Put your logic and deduction skills to the test with CodeAB, a fun and addictive number puzzle game! Meet CodeAB — a fresh spin on the classic Bulls & Cows number puzzle. Your challenge: figure out the secret 4-digit code before your guesses run out! Your goal is simple: find the secret 4-digit code. - No leading zeros. - No repeating digits. - Clues after every guess help guide you toward the solution. How It Works - A green number = correct digit in the correct place. - An orange number = correct digit in the wrong place. - Keep analyzing the hints until you crack the code! Why You’ll Love CodeAB - Easy to learn, hard to master - A fresh take on the classic “Bulls & Cows” logic game - Quick rounds that train your brain anytime, anywhere - Great for both casual players and puzzle enthusiasts Free to Play – Upgrade for Unlimited Fun - Play up to 10 rounds for free and then 3 rounds per day - Upgrade once ($2.99) to unlock unlimited play and remove interruptions - One-time purchase, no subscriptions Are you ready to put your logic to the ultimate test? Download CodeAB today and see how fast you can break the code!

About

Protocol 4

Features
Read full description

Step into the world of elite hackers with Protocol 4! Your mission is to crack secret codes using pure logic, deduction, and specialized hacking tools. Play the high-stakes Daily Challenge, climb the Global Leaderboards, or challenge another operator to a real-time PvP Duel! Features: REAL-TIME PvP DUELS: Race another operator to the same code, or play a STANDOFF where each of you sets the code the other must break. Stake your credits — the winner takes the pot. BUILD YOUR EMPIRE: Assemble mining rigs, expand your vault, and run overclocks. Your network keeps earning credits while you are away. SYNDICATES AND TERRITORY: Join a syndicate, claim territory on the map, and take your share of the pot that every raid feeds. RAIDS: Break into a rival operator's grid and take what they left unguarded — then set your own defenses before they come for you. GLOBAL LEADERBOARD: Earn XP and climb fifteen ranks to become the ultimate Server King. MULTIPLE GAME MODES: Play Quick Hacks for fast action, Training to hone your skills, or the Daily Challenge for massive rewards. ARSENAL OF TOOLS: Use advanced tools like Logic Analyzers, Time Warps, and Oracle Hints to gain the upper hand. CAREER CONTRACTS: 18 long-run contracts and fresh daily missions keep your ledger moving. PROGRESSION SYSTEM: Start as a Rookie and level up to unlock elite titles and badges. Play in English, Turkish, Spanish, French, German or Portuguese — on iPhone and iPad. Are you ready to initiate Protocol 4?

Screenshots

CodeAB4 screens
Protocol 44 screens

Verdict

The call

The clearest difference is ads: CodeAB at none against Protocol 4's shown. CodeAB also leads on update cadence (every 6 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement 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. CodeAB sells 1 one-off in-app purchase and Protocol 4 sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

CodeAB ships an update every 6 weeks, Protocol 4 every 4 months. The most recent releases landed on September 17, 2026 and September 6, 2026 respectively.

Scorecard2 real differences · 8 level
CodeAB versus Protocol 4: the parameters behind the verdict, then further details
ParameterCodeABProtocol 4
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 6 weeks — betterEvery 4 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size3 MB12 MB
Age rating4+4+
DeveloperEssentialCapture IncHAKAN OZGER

In-app purchases

1 purchases

CodeAB

One-time1
  • CodeAB$2.99
7 purchases

Protocol 4

One-time7
  • Pocket Change$0.99
  • Starter Kit$1.99
  • Agent License$2.99
Show 4 more
  • Hacker's Stash$4.99
  • Pro Kit$4.99
  • Trust Fund$9.99
  • Master Kit$9.99

Questions

Is CodeAB free?
CodeAB is free to download, with in-app purchases available.
Is Protocol 4 free?
Protocol 4 is free to download, with in-app purchases available.
Do CodeAB or Protocol 4 have ads?
Protocol 4 shows ads; CodeAB does not.
Which is updated more often, CodeAB or Protocol 4?
CodeAB ships an update every 6 weeks, and Protocol 4 every 4 months. Most recently, CodeAB was updated on September 17, 2026 and Protocol 4 on September 6, 2026.

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