Comparison

OverclockeTD vs SPHERE

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

Head to head
About

OverclockeTD

A synthwave-inspired tower defense game where you strategically place towers to eliminate enemies. Overclock your defenses for temporary boosts and protect your heart across multiple worlds and levels. Enjoy a free experience with optional additional content.

Highlights
  • Strategic tower placement
  • Overclocking for temporary power-ups
  • Synthwave 80s pixel art style
  • Multiple worlds and levels
  • Free to play with optional purchases
Features
Read full description

Build towers, protect your heart, overclock to be OP and enjoy the synth — in this 80s pixel synthwave inspired tower defense game. Strategically place towers to eliminate incoming enemy creeps. Overclock your towers to make them stronger for a short period of time, when you desperately need the extra firepower. Use the strengths of the different towers to your advantage to rise victorious! 7 worlds with a total of 33 levels await you for free and without ads! Get 3 more worlds with another 15 levels for a price of your choice! Can you defeat the enemies and protect your heart in all levels? OverclockeTD was selected as one of 16 'Favorite Swiss Made Games' on the App Store in Switzerland in August 2021.

About

SPHERE

Features
Read full description

- Worldview - The Sphere (Earth) is now facing the threat of annihilation by invaders. Humanity has been forced from their homes and has begun developing new weapons in underground facilities. As countless lives and resources are lost, humans have finally succeeded in developing a new weapon capable of opposing the invaders. Now, having endured years of agony, it is time to advance toward the hope of liberating the Sphere! Humanity is now launching a counteroffensive! - Game Overview - This is a simple placement-style tower defense game where you place units to defeat incoming enemies! As you defeat enemies, your resources increase, allowing you to place new units or upgrade existing ones! - Game Difficulty - Difficulty levels are EASY, NORMAL, and HARD! This game is suitable for tower defense beginners to advanced players, offering a challenging gameplay experience for everyone! There are 10 refined stages for each difficulty level, with each stage lasting about 5 to 15 minutes! Enjoyable even during a short break! Whether you are new to tower defense or a master, this game is for you! - Unit Types - Players can use the following seven types of units: [Attack Units] Each unit excels in different situations, so place them appropriately according to the battlefield conditions! Standard Attack Turret: A unit with a short attack interval, specializing in defeating enemies one by one. Area Attack Turret: A unit that excels in attacking multiple enemies with explosive blasts. Piercing Attack Turret: A unit that excels in attacking enemies lined up in a straight line. [Support Units] These units enhance the advantages of friendly units, so place them without hesitation when you have extra resources! Cooling Turret: A unit that slows down the speed of enemies. Incendiary Turret: A unit that increases the attack power of attack units. [Support Attack Units] Use these units to weaken enemies before friendly units attack or as an emergency response to prevent enemy breakthroughs! Fixed-Point Attack Unit: Provides pinpoint missile support attacks at specific locations. Linear Attack Unit: Conducts satellite laser bombardment at designated linear locations.

Screenshots

OverclockeTD4 screens
SPHERE4 screens

Verdict

The call

The clearest difference is in-app purchases: SPHERE at none against OverclockeTD's 6. OverclockeTD's advantage is ads (none vs shown) and update cadence (every 2 months vs every 4 months). On price, device support and iOS requirement 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. OverclockeTD sells 6 one-off in-app purchases. SPHERE asks for nothing beyond the download.

UpkeepUpdate frequency

OverclockeTD ships an update every 2 months, SPHERE every 4 months. The most recent releases landed on July 7, 2026 and September 8, 2026 respectively.

Scorecard3 real differences · 7 level
OverclockeTD versus SPHERE: the parameters behind the verdict, then further details
ParameterOverclockeTDSPHERE
PriceFreeFree
Rating4.4 (9 ratings) — better—
Positive reviews80.0% of reviews—
Number of ratings9 — better—
Update frequencyEvery 2 months — betterEvery 4 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better13.0
Further details — not scored
Size115 MB154 MB
Age rating9+4+
DeveloperJonas KrucherTomoki Fukushima

In-app purchases

6 purchases

OverclockeTD

One-time6
  • Small Pledge$0.99
  • Premium: small amount$0.99
  • Medium Pledge$2.99
Show 3 more
  • Premium: medium amount$2.99
  • Big Pledge$4.99
  • Premium: big amount$4.99
None

SPHERE

No in-app purchases

Questions

Is OverclockeTD free?
OverclockeTD is free to download, with in-app purchases available.
Is SPHERE free?
SPHERE is free to download, with no in-app purchases.
Do OverclockeTD or SPHERE have ads?
SPHERE shows ads; OverclockeTD does not.
Which is updated more often, OverclockeTD or SPHERE?
OverclockeTD ships an update every 2 months, and SPHERE every 4 months. Most recently, OverclockeTD was updated on July 7, 2026 and SPHERE on September 8, 2026.

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