Comparison

Rival Edge vs Greatest Common Divisor PRO

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

Head to head
About

Rival Edge

Master strategic decision-making with real-life scenarios and Nobel Prize-winning game theory concepts. Learn practical rules for everyday dilemmas, track your progress, and gain an edge in negotiations and relationships.

Highlights
  • Interactive real-life scenarios
  • 12 essential game theory concepts
  • 20 practical daily rules
  • Progress tracking with XP and ranks
  • Payoff matrices for decision math
  • Offline functionality
  • Supports 6 languages
Features
Read full description

Learn game theory through real-life scenarios. Rival Edge teaches you the science of strategic decision-making. INTERACTIVE SCENARIOS Face real dilemmas: salary negotiations, splitting restaurant bills, trust in relationships, group projects, and more. Every choice has consequences calculated through actual game theory models. 12 ESSENTIAL THEORIES Nash Equilibrium — why people get stuck in suboptimal situations Tit-for-Tat — the winning strategy in repeated interactions Prisoner's Dilemma — when cooperation beats selfishness Tragedy of the Commons — why shared resources disappear Ultimatum Game — the psychology of fairness And 7 more Nobel Prize-winning concepts 20 DAILY RULES Practical principles for everyday life: "Always name your number first", "Mirror behavior, not words", "Forgive fast, but remember". Each rule is backed by research. FEATURES 10+ scenarios with multiple outcomes Payoff matrices showing the math behind decisions Progress tracking with XP and ranks Beautiful dark interface 6 languages: English, Russian, French, German, Spanish, Italian No ads, no tracking, fully offline Whether you're negotiating a raise, dealing with a difficult neighbor, or deciding whether to trust someone — game theory gives you the edge.

About

Greatest Common Divisor PRO

Features
Read full description

Finish your homework instantly. Prepare for exams without stress. Complete step-by-step solutions. Enter your numbers and calculate the greatest common divisor (GCD). HOW IT WORKS Enter your numbers into the appropriate fields and get started. You'll receive the solution instantly and can share it with friends or classmates. YOUR PERSONAL DATA We don't need it. Only anonymous data is collected, for example: - which features are used - how many solutions are generated This helps us improve the app. It is not possible to identify you from this data. EXTRAS - Prime factorization - Using divisors - Euclidean algorithm - Curated learning videos - Feedback for incorrect input - Manage your own solutions - App introduction CONTACT Questions and feedback are always welcome via Discord or directly in the app review.

Screenshots

Rival Edge4 screens
Greatest Common Divisor PRO4 screens

Verdict

The call

The clearest difference is update cadence: Greatest Common Divisor PRO at every 5 weeks against Rival Edge's every 6 months. Greatest Common Divisor PRO also leads on price ($1.99 vs $3.99) and iOS requirement (15.0 vs 26.0). On ads, in-app purchases 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

Rival Edge costs $3.99 and Greatest Common Divisor PRO $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Rival Edge ships an update every 6 months, Greatest Common Divisor PRO every 5 weeks. The most recent releases landed on October 4, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 6 level
Rival Edge versus Greatest Common Divisor PRO: the parameters behind the verdict, then further details
ParameterRival EdgeGreatest Common Divisor PRO
Price$3.99$1.99 — better
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size7 MB179 MB
Age rating4+4+
DeveloperVladimir RodzaevskiyGlindemann, Sennoun, Langer GbR

In-app purchases

None

Rival Edge

No in-app purchases

None

Greatest Common Divisor PRO

No in-app purchases

Questions

Is Rival Edge free?
Rival Edge costs $3.99, with no in-app purchases.
Is Greatest Common Divisor PRO free?
Greatest Common Divisor PRO costs $1.99, with no in-app purchases.
Do Rival Edge or Greatest Common Divisor PRO have ads?
Neither Rival Edge nor Greatest Common Divisor PRO shows ads.
Which is updated more often, Rival Edge or Greatest Common Divisor PRO?
Rival Edge ships an update every 6 months, and Greatest Common Divisor PRO every 5 weeks. Most recently, Rival Edge was updated on October 4, 2026 and Greatest Common Divisor PRO on October 24, 2026.

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