Comparison

Castle Rivals vs UBoat Commander

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

Head to head
About

Castle Rivals

Engage in fast-paced PvP battles by building defenses and firing cannons to destroy enemy castles. Utilize physics-based destruction and strategic hero abilities to outmaneuver opponents. Every shot counts in this skill-based combat game.

Highlights
  • Physics-based destruction
  • Skill-based cannon combat
  • Unique heroes with special abilities
  • Strategic gameplay
  • Upgradeable castles
  • Epic castle battles
Features
Read full description

Build your defenses, load the cannon, and destroy the enemy castle before they destroy yours! Castle Rivals is a fast-paced PvP destruction game where precision, strategy, and timing decide the battle. Command powerful heroes, fire devastating weapons, and watch enemy fortresses collapse with fully physics-based destruction. Every shot matters. Aim for structural weak points, bring down towers, and turn the enemy castle into rubble before your own defenses fall. FEATURES Epic Castle Battles Face off against enemy castles in intense PvP duels where only one fortress survives. Physics-Based Destruction Blast walls, collapse towers, and watch entire castles crumble realistically. Skill-Based Cannon Combat Aim carefully, adjust your shots, and exploit weak points to cause massive damage. Unique Heroes Unlock heroes with powerful weapons and special abilities. Each hero changes how you attack the enemy castle. Strategic Gameplay Choose the right hero and target the right structure to trigger devastating chain reactions. Upgradeable Castles Strengthen your defenses and make your fortress harder to destroy. Satisfying Destruction Every battle is different as structures collapse and battles unfold dynamically. Do you have the skill to bring down the enemy fortress before yours falls? Load the cannon. Take aim. Destroy the castle.

About

UBoat Commander

Command a World War II submarine, navigating the ocean depths to hunt enemy ships and convoys. Strategize your attacks with torpedoes and stealth, then upgrade your vessel for enhanced speed, armor, and weaponry to survive intense naval battles.

Highlights
  • Command a WW2 submarine
  • Hunt enemy ships and convoys
  • Navigate surface and underwater
  • Upgrade submarine speed, armor, stealth
  • Unlock new weapons and abilities
  • Complete diverse missions
Features
Read full description

Command Your Submarine in WW2 Battles Take control of a powerful submarine and dominate the seas in World War II naval warfare. Dive deep, hunt enemy ships, and strike with torpedoes. Every mission is a test of strategy, precision, and survival. Real Submarine Experience Navigate on the surface or dive underwater Control speed, direction, and depth Avoid detection and attack at the right moment Naval Combat Sink enemy warships and convoys Fight against aircraft and patrol forces Use torpedoes and positioning Upgrade Your Submarine Improve speed, armor, and stealth Unlock new weapons and abilities Customize your submarine Missions Destroy convoys Survive enemy attacks Complete objectives Become the Hunter of the Seas Plan your attack, stay hidden, and strike when the enemy least expects it. The ocean is your battlefield.

Screenshots

Castle Rivals4 screens
UBoat Commander4 screens

Verdict

The call

The clearest difference is rating: Castle Rivals at 4.5 against UBoat Commander's 3.3. Castle Rivals also leads on ratings volume (1.8K vs 3) and monetization model (ad-supported vs free with in-app purchases). UBoat Commander's advantage is update cadence (every 4 days vs every 9 days) and review sentiment (50% vs 40%). On price, 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

Both are free to download. Castle Rivals sells 14 one-off in-app purchases and UBoat Commander sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Castle Rivals holds the better App Store score, 4.5 against 3.3. That said, the two scores are not equally well evidenced: Castle Rivals has 1.8K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 40% of Castle Rivals's written reviews are positive against 50% of UBoat Commander's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Castle Rivals ships an update every 9 days, UBoat Commander every 4 days. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
Castle Rivals versus UBoat Commander: the parameters behind the verdict, then further details
ParameterCastle RivalsUBoat Commander
PriceFreeFree
Rating4.5 (1.8K ratings) — better3.3 (3 ratings)
Positive reviews39.6% of reviews50.0% of reviews — better
Number of ratings1.8K — better3
Update frequencyEvery 9 daysEvery 4 days — better
AdsYesYes
In-app purchasesYesYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size512 MB406 MB
Age rating9+4+
DeveloperVoodooIvan Trafimovich

Customer experience

Castle Rivals

All ratings1,638 ratings
Positive87.4%
Neutral8.1%
Negative4.5%
Written reviews91 reviews
Positive39.6%
Neutral19.8%
Negative40.7%

UBoat Commander

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

14 purchases

Castle Rivals

One-time14
  • Starter Pack$1.99
  • Hero Boost$3.99
  • Small Gem Package$4.99
Show 11 more
  • Champion Pack$4.99
  • Elite Pack$7.99
  • Medium Gem Package$9.99
  • Arena Pack$9.99
  • Moon Maiden Offer$9.99
  • Battle Pass$9.99
  • No Ads Temporary$9.99
  • Vampire Hunter Offer$9.99
  • Forge Pass$14.99
  • Large Gem Package$19.99
  • Huge Wildcard Package$49.99
2 purchases

UBoat Commander

One-time2
  • No ads package$2.99
  • VIP USS Gato submarine package$12.99

Questions

Is Castle Rivals free?
Castle Rivals is free to download, with in-app purchases available.
Is UBoat Commander free?
UBoat Commander is free to download, with in-app purchases available.
Which has better reviews, Castle Rivals or UBoat Commander?
Castle Rivals is rated higher. Castle Rivals averages 4.5 out of 5 from 1.8K ratings, while UBoat Commander averages 3.3 from 3 ratings.
Do Castle Rivals or UBoat Commander have ads?
Both Castle Rivals and UBoat Commander show ads.
Which is updated more often, Castle Rivals or UBoat Commander?
Castle Rivals ships an update every 9 days, and UBoat Commander every 4 days. Most recently, Castle Rivals was updated on October 31, 2026 and UBoat Commander on October 24, 2026.

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