Prime Defense vs Spire
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Prime Defense
Engage in a fast-paced tower defense game defending your central tower from relentless enemy waves. Utilize a variety of weapons, upgrade your defenses, and unlock special abilities to survive increasingly difficult challenges.
- One-touch controls
- Multiple weapon types
- Tower upgrades
- Special abilities
- Endless waves
- Tower personalization
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Prime Defense is a fast-paced tower defense game where strategy meets action. Your tower stands at the center — defend it against waves of incoming enemies from all directions. FEATURES: • Simple one-touch controls — tap to activate abilities • Multiple weapon types: Guns, Lasers, Shotguns, Chain Lightning, and Missiles • Upgrade your tower's damage, speed, fire rate, and health • Unlock special abilities • 64 tower color combinations to personalize your experience • Dynamic app icon that matches your tower colors • Endless waves with increasing difficulty How long can you survive?
Spire
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Spire is a calm, endless 3D tower-stacking game. A glowing slab slides across the top of your tower — tap once to drop it. Land it dead-center for a PERFECT to keep your full width and grow a combo; miss, and whatever overhangs gets sliced clean away and the next slab is narrower. The palette climbs through twilight as you rise, from deep indigo to warm light. There is no finish line, no timer, no pressure — only your next best height. • One-tap controls — easy to learn, hard to put down • Chase PERFECT center drops to build combos • Soft, glowing 3D built for relaxing play • Endless climb through a shifting twilight palette • Works fully offline — no account, no sign-up • Free to play How high can you climb?
Screenshots
Verdict
The clearest difference is in-app purchases: Spire at none against Prime Defense's 1. Spire also leads on iOS requirement (16.4 vs 26.2). On price, 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. Prime Defense sells 1 one-off in-app purchase. Spire asks for nothing beyond the download.
| Parameter | Prime Defense | Spire |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 days | — |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 26.2 | 16.4 — better |
| Further details — not scored | ||
| Size | 71 MB | 69 MB |
| Age rating | 9+ | 4+ |
| Developer | Philip McCarty | Cristopher Guido |
In-app purchases
Prime Defense
- Unlimited Continues$0.99
Spire
No in-app purchases





