Cosmic Summon vs Rainbow Buster
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Cosmic Summon
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Cosmic Summon is a unique blend of gacha summoning and tower defense strategy. Summon powerful heroes, place them on the battlefield, and defend your wall against endless waves of enemies — all under the stars of real constellations. SUMMON & COLLECT 12 UNIQUE HEROES Each hero brings a distinct combat style to the battlefield: • Wind Piercer — Piercing shots that penetrate multiple enemies • Blaze Caster — Fire splash dealing area damage • Frost Weaver — Slows enemies with freezing attacks • Thunder Chain — Chain lightning bouncing between targets • Cannon Lord — Devastating splash damage in a wide radius • Wind Dancer — Summons tornadoes that damage and slow • Venom Curse — Poisons enemies with damage over time • Shock Guard — Shockwave knockback to push enemies back • Armor Breaker — Curse attacks that shred enemy armor Plus 3 support heroes: Wall Keeper (heals your wall), Gold Digger (generates gold), and Melodist (buffs team attack speed). MERGE TO EVOLVE Combine two heroes of the same type to upgrade them. Progress through 7 rarity tiers — from Spark to the legendary Genesis rank. Higher rarities unlock stronger abilities and stunning visual effects. Strategic merging is the key to surviving later waves. FACE 28 ENEMY TYPES + BOSSES Every few waves, new enemy types appear with unique abilities: • Stealth lurkers that vanish from sight • Splitters that divide into smaller enemies on death • Healers that restore nearby allies • Chargers that rush your wall at extreme speed • Reflectors that bounce damage back • Summoners that spawn endless minions • And many more — each demanding a different strategy. Boss encounters every 5 waves test your entire defense. 50 CONSTELLATION-THEMED WAVES Battle under the stars of real constellations — from Aries to Orion, Cassiopeia to the Southern Cross. Each wave features a beautifully rendered constellation as your battlefield backdrop. TARGETED SUMMON Choose exactly which hero you want with the Select feature. Pick your favorite hero and add them to your army — a strategic advantage when you need a specific ability to counter the next wave. KEY FEATURES • Free-to-play with rewarded video ads • 12 heroes × 7 rarity tiers = 84 hero variations • 28 enemy types with unique abilities + boss battles • Merge system with unlimited progression potential • Real constellation artwork for 50 wave backgrounds • Auto-battle with strategic hero placement • Support heroes that heal, buff, and generate gold • Battle statistics tracking across all games Download Cosmic Summon and defend the stars!
Rainbow Buster
Launch volleys of balls to break rainbow bands in this physics-based arcade game. Survive as the board closes in, collect power-ups, and track your high scores. Offers adjustable settings and an optional ad-free experience.
- Physics-based arcade shots
- Drag-to-aim controls
- Shifting rainbow arc segments
- Extra-ball power-ups
- Score history and tracking
- Adjustable gameplay settings
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Rainbow Buster is a standalone arcade game about launching volleys, breaking rainbow bands, and surviving as the board closes in. Aim from the floor launcher, release a volley of balls, and carve through curved rainbow segments before they press too close. Each hit adds to your score. Extra-ball pickups increase future volleys, and every turn brings the next wave of bands inward. Features: - Physics-based arcade shots with drag-to-aim controls - Rainbow arc segments that shift, stack, and tighten after each volley - Extra-ball pickups that build bigger future shots - Score history and high-score tracking - Adjustable gameplay settings - Optional Advanced Settings unlock for deeper tuning, profiles, and Record Mode - Optional Remove Ads unlock - Local support, privacy, and ad-reporting information inside Settings Rainbow Buster does not require an account or online login. Purchases are handled with Apple's in-app purchase system, and Restore Purchases is available in Settings.
Screenshots
Verdict
The clearest difference is in-app purchases: Cosmic Summon at none against Rainbow Buster's 2. Cosmic Summon also leads on iOS requirement (12.0 vs 18.5). On price, update cadence, ads 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
Both are free to download. Rainbow Buster sells 2 one-off in-app purchases. Cosmic Summon asks for nothing beyond the download.
Cosmic Summon ships an update every 4 days, Rainbow Buster every 3 days. Both last shipped on October 25, 2026.
| Parameter | Cosmic Summon | Rainbow Buster |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 4 days | Every 3 days — better |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 34 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Maojian Tang | Croy Labs LLC |
In-app purchases
Cosmic Summon
No in-app purchases
Rainbow Buster
- Remove Ads$4.99
- Advanced Settings$9.99
Questions
Is Cosmic Summon free?
Is Rainbow Buster free?
Do Cosmic Summon or Rainbow Buster have ads?
Which is updated more often, Cosmic Summon or Rainbow Buster?
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