Sphere TD vs Stellar
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- 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
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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?
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.
- 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
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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
Verdict
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
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.
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.
Sphere TD ships an update every 3 days, Stellar weekly. Both last shipped on October 25, 2026.
| Parameter | Sphere TD | Stellar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (10 ratings) | 4.7 (45 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 69.2% of reviews |
| Number of ratings | 10 | 45 — better |
| Update frequency | Every 3 days — better | Weekly |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 363 MB | 161 MB |
| Age rating | 12+ | 12+ |
| Developer | StandardIssueGames | Enoxys |
Customer experience
Sphere TD
Stellar
In-app purchases
Sphere TD
- Au Field Ration$4.99
- Defender Starter Pack$7.99
- Au Supply Cache$9.99
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- 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
Stellar
- Star Pack$0.99
- Remove Ads$2.99
- Constellation Pack$3.99
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- Founder Pack$6.99
- Galaxy Pack$8.99
- VIP Pass$12.99
- Admiral's Vault$22.99








