Comparison

Sphere TD vs Stellar

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

Head to head
About

Sphere TD

A complex tower defense game where you build and upgrade towers to defend against waves of spheres. Strategize with deep customization, resource management, and research to overcome challenges. Offers extensive replayability with numerous levels and modes.

Highlights
  • Tower and projectile customization
  • 30 base towers with 28+ stats
  • 33 mods with millions of combinations
  • Research and crafting system
  • Tower inventory and energy management
  • 50 hand-crafted levels and endless mode
  • Offline and online play with cloud sync
Read full description

Sphere TD is a tower defense game with one difference: there are no preset towers. You build every tower yourself by combining mods to spam more projectiles. UNIQUE FEATURES - Build & mod every tower. There are no preset towers. - Defend each map with 5 towers. Max them out and spam more projectiles. - Split your shots, bounce, multiply, shock, burn. The build is up to you. - Your base can fly, towers and all. Explore the maps and mine ores. - Research and craft mods. Just don't run out of energy. WHAT IS IN THE GAME - 41 towers, each with its own grid layout and function - 33 mods, each with tiers, MK upgrades, a B-Side function, and 3 perks, for over a million tower builds - 50 hand-crafted maps with three objectives each - Endless mode after map 50, plus map-specific challenges - A research tree, mod crafting, and a trader - Spheres that scale into elites, bosses, armored, shielded, cloaked and flying - Offline play, with cloud sync and leaderboards - Cross platform: mobile and desktop NO NONSENSE No pay to win. No time gates. No paywalls. No ad spam. No loot boxes. Funding the Galatium Academy is appreciated, never required. MESSAGE FROM THE DEV Hi, I'm Alex, a solo developer, and Sphere TD is my first game. If you like tower defense and building your own towers, you should feel right at home. Come discuss tower builds with other friendly cadets on Discord. I am committed to 10 years of support. You want it, I'll make it. Ready to join the Galatium Academy?

About

Stellar

Build an interstellar empire from a single colony to galactic domination. Develop colonies, explore solar systems, research technologies, and engage with AI factions through diplomacy or warfare. Manage resources, build diverse fleets, and complete missions to unlock new features.

Highlights
  • Colony development and resource management
  • Interstellar exploration and colonization
  • Extensive technology tree
  • AI faction interaction (diplomacy/warfare)
  • Diverse fleet building and combat
  • Resource trading and market management
  • Commander missions and achievements
Features
Read full description

Start with one colony on a lost planet. End as the power that rules the galaxy. Stellar Dominion is a space strategy game in the tradition of OGame, rebuilt for your phone: deep economy, real fleets, and an empire that keeps producing while you are away. BUILD YOUR EMPIRE Mines, refineries, laboratories and shipyards: shape every colony, balance ore, crystal and helium-3, manage your energy, and push storage further with the Wonder, the endgame project that turns surplus into power. EXPLORE AND LOOT Send expeditions into the unknown and choose their posture. Scan stellar anomalies to weigh the loot before you attack. Bring debris fields home with your recyclers. RESEARCH AND SPECIALISE A full tech tree, doctrines, talent trees and colony destinies such as Arsenal, Gaia or Free Zone. Two empires never look alike. COMMAND YOUR FLEET Fighters, cruisers, battleships, destroyers, Leviathans and healer ships. Simulate a battle before you commit, read the full report, then replay it round by round. PLAY TOGETHER Join an alliance, share resources, muster a joint assault on the Asteroid Belt, and face the world boss every weekend with the whole server. Seasons open fresh worlds with their own leaderboards. MADE BY ONE DEVELOPER Free to play, no energy meter, and gems can be earned in play. New versions every few weeks, built from player feedback on Discord. Available in English, French, German, Spanish, Portuguese, Russian, Japanese, Simplified and Traditional Chinese.

Screenshots

Sphere TD4 screens
Stellar4 screens

Verdict

The call

Sphere TD and Stellar both sit at 4.6 stars, but that hides the real split: 100% of Sphere TD's written reviews are positive against 69% of Stellar's. Sphere TD also leads on update cadence (every 3 days vs weekly). Stellar's advantage is ratings volume (45 vs 10). On price, rating, ads and in-app purchases 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. Sphere TD sells 10 one-off in-app purchases and Stellar sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Sphere TD against 4.7 for Stellar. Both are backed by a comparable volume of ratings — 10 and 45 respectively. Written reviews are what separate them: 100% of Sphere TD's written reviews are positive against 69% of Stellar's.

UpkeepUpdate frequency

Sphere TD ships an update every 3 days, Stellar weekly. Both last shipped on October 25, 2026.

Scorecard3 real differences · 7 level
Sphere TD versus Stellar: the parameters behind the verdict, then further details
ParameterSphere TDStellar
PriceFreeFree
Rating4.6 (10 ratings)4.7 (45 ratings) — better
Positive reviews100.0% of reviews — better69.2% of reviews
Number of ratings1045 — better
Update frequencyEvery 3 days — betterWeekly
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.015.0
Further details — not scored
Size363 MB161 MB
Age rating12+12+
DeveloperStandardIssueGamesEnoxys

Customer experience

Sphere TD

All ratings10 ratings
Positive90.0%
Neutral0.0%
Negative10.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Stellar

All ratings45 ratings
Positive86.7%
Neutral11.1%
Negative2.2%
Written reviews13 reviews
Positive69.2%
Neutral23.1%
Negative7.7%

In-app purchases

10 purchases

Sphere TD

One-time10
  • Au Field Ration$4.99
  • Defender Starter Pack$7.99
  • Au Supply Cache$9.99
Show 7 more
  • Galatium Express Token$9.99
  • Galatium Academy Pack$14.99
  • Shadow Broker Vantage$19.99
  • Au Enterprise Fund$24.99
  • Flux Enrichment Grant$24.99
  • Au Strategic Stockpile$49.99
  • Au Global Reserve$99.99
7 purchases

Stellar

One-time7
  • Star Pack$0.99
  • Remove Ads$2.99
  • Constellation Pack$3.99
Show 4 more
  • Founder Pack$6.99
  • Galaxy Pack$8.99
  • VIP Pass$12.99
  • Admiral's Vault$22.99

Questions

Is Sphere TD free?
Sphere TD is free to download, with in-app purchases available.
Is Stellar free?
Stellar is free to download, with in-app purchases available.
Which has better reviews, Sphere TD or Stellar?
Stellar is rated higher. Sphere TD averages 4.6 out of 5 from 10 ratings, while Stellar averages 4.7 from 45 ratings.
Do Sphere TD or Stellar have ads?
Both Sphere TD and Stellar show ads.
Which is updated more often, Sphere TD or Stellar?
Sphere TD ships an update every 3 days, and Stellar weekly. Most recently, Sphere TD was updated on October 25, 2026 and Stellar on October 25, 2026.

Other comparisons