Comparison

Protocol 4 vs AstroSpell

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

Head to head
About

Protocol 4

Features
Read full description

Crack the code before your rival does. Protocol 4 is a hacker game of pure deduction. Every guess gives you signal readings; you break the passcode with logic, not luck. Play solo, take on the Daily Operation, or duel another operator in real time. REAL-TIME PvP DUELS Race: one passcode, two operators. First one through wins. Standoff: each of you sets the code the other must break. Two codes, one clock, and you watch them close in on yours. Outsmart your rival and claim the reward. DAILY OPERATION A new code every day, the same for everyone. Crack it, climb the daily leaderboard and earn double XP. 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 one of three syndicates, 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. MORE WAYS TO PLAY Quick Hacks for fast action, Training to sharpen your deduction, and 18 career contracts plus fresh daily missions. ARSENAL OF TOOLS Oracle Scan, Double XP and more hacking tools to gain the upper hand when a code will not give. Play in English, Turkish, Spanish, French, German or Portuguese, on iPhone and iPad. Are you ready to initiate Protocol 4?

About

AstroSpell

Features
Read full description

AstroSpell is a space-themed word mission game that turns spelling practice into a galaxy journey. Reveal astronomy words, manage oxygen, survive hazards, collect star coins, unlock achievements, and learn real space facts as you progress. The app includes campaign levels, a deterministic daily challenge, Spell-It recall mode, spoken word pronunciation, spaced-repetition review, accessibility-friendly typography, and a Mission Control learning hub. Version 1.3 adds Today's Flight Plan in Mission Control. The app reviews your local progress, missed words, review queue, and accuracy to recommend the best next session: Recovery Run, Spell-It, Campaign, or Daily Challenge. It also shows focus words, estimated practice time, and the category most worth reviewing. Core features include: - 200 astronomy word missions with original hints and facts. - Campaign, Daily Challenge, Spell-It, and Recovery Run modes. - Spoken pronunciation using on-device text-to-speech. - Spaced-repetition word review for missed words. - Mission Control learning hub with the new daily Flight Plan. - Difficulty profiles for different skill levels. - Achievements, star coins, upgrades, and galaxy map progression. - Safe offline play with local stats and progress. - Accessibility options including dyslexia-friendly typography. - Synthesized audio and haptics. AstroSpell does not require an account. Progress, settings, and word mastery stay on the device.

Screenshots

Protocol 44 screens
AstroSpell4 screens

Verdict

The call

The clearest difference is price: Protocol 4 at Free against AstroSpell's $0.99. AstroSpell's advantage is in-app purchases (none vs 7) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Protocol 4 is free to download; AstroSpell costs $0.99 up front. Protocol 4 sells 7 one-off in-app purchases. AstroSpell asks for nothing beyond the download.

UpkeepUpdate frequency

Protocol 4 ships an update every 3 months, AstroSpell every 6 days. The most recent releases landed on October 8, 2026 and October 9, 2026 respectively.

Scorecard4 real differences ยท 2 level
Protocol 4 versus AstroSpell: the parameters behind the verdict, then further details
ParameterProtocol 4AstroSpell
PriceFree โ€” better$0.99
Update frequencyEvery 3 monthsEvery 6 days โ€” better
AdsYesNo โ€” better
In-app purchasesYesNo โ€” better
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details โ€” not scored
Size12 MB7 MB
Age rating4+4+
DeveloperHAKAN OZGERRobert Corbin

In-app purchases

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
None

AstroSpell

No in-app purchases

Questions

Is Protocol 4 free?
Protocol 4 is free to download, with in-app purchases available.
Is AstroSpell free?
AstroSpell costs $0.99, with no in-app purchases.
Do Protocol 4 or AstroSpell have ads?
Protocol 4 shows ads; AstroSpell does not.
Which is updated more often, Protocol 4 or AstroSpell?
Protocol 4 ships an update every 3 months, and AstroSpell every 6 days. Most recently, Protocol 4 was updated on October 8, 2026 and AstroSpell on October 9, 2026.

Other comparisons