What is the best merge defense game app for iPhone?

Merge Clash: Tower Defense, S tier, ranked #1 of 21, rated 4.8 by 14,173 people.

Which merge defense game apps are free?

21 of 21 are free to download: Merge Clash: Tower Defense (S), Ammo Fever: Tower Gun Defense (S), Fortress Merge (S), Lucky Defense! (S) and more. 8 of them sell in-app purchases. 1 reports no in-app purchases.

Which merge defense game app has the best App Store rating?

Plants on Fire at 4.8 from 2,434 ratings.

AppTierList › All lists › Merge Defense Games

Best Merge Defense Game Apps for iPhone (2026)

21 apps ranked S through F · Updated 2026-10-21 · Ranked by AppTierList, computed, never sold · JSON

Part of Tower Defense.

Merge Clash: Tower Defense is the top-ranked of 21 merge defense game apps on iPhone, at S tier with 4.8/5 from 14,173 ratings.

1
Merge Clash: Tower DefenseS
Free + IAP · ★ 4.8 · 14,173 ratings · score 94
2
Ammo Fever: Tower Gun DefenseS
Free download · ★ 4.6 · 56,175 ratings · score 94
3
Fortress MergeS
Free download · ★ 4.6 · 10,927 ratings · score 93
4
Lucky Defense!S
Free download · ★ 4.6 · 12,210 ratings · score 90
5
Harvest King: Farm Defense TDA
Free + IAP · ★ 4.8 · 2,685 ratings · score 88

What belongs in this list

Defend against enemy waves by merging units or items into stronger ones.

Not here: a merge game with no defense alone; a tower defense with no merging alone; a merge battle game with no base to defend alone; a merge cooking game alone; a matching game alone

How we pick

For this list we ask the App Store the same searches a person would, in several countries, and keep every app it returns. A model reads each app's listing and rejects the ones that only mention the use case. Every app that stays is scored out of 100 from four parts, each 0 to 100 and averaged with no weights: its App Store rating, how many people rated it, where the App Store itself ranks it for this list's searches, and how recently its current version shipped. An app showing Apple's Editors' Choice badge gets a fifth part of 100, which can only lift its score. Tiers follow fixed score bands: S from 90, A from 80, B from 70, C from 60, D from 50, F below. The list's leader is S if it scores 80 or more. On a list of 20 or more ranked apps, a tier from S to D takes in new apps only up to a quarter of the top 40: an app pushed out of a full tier falls to the next tier with room, and F takes the rest. An app already in a tier keeps its place while the tier is at most 2 apps over a quarter; past that, only the apps over that margin go down, lowest score first. Equal scores share a tier, and no app has a better tier than an app ranked above it. An app keeps its tier until its score passes the band edge by more than 1 point, or a full tier or the order above moves it. Only the top 40 of a list get a tier. Read the full method →

Compare every app

1
Merge Clash: Tower DefenseS
Free + IAP · ★ 4.8 · 14,173 ratings · score 94 · best in class
2
Ammo Fever: Tower Gun DefenseS
Free download · ★ 4.6 · 56,175 ratings · score 94 · best in class
3
Fortress MergeS
Free download · ★ 4.6 · 10,927 ratings · score 93 · best in class
4
Lucky Defense!S
Free download · ★ 4.6 · 12,210 ratings · score 90 · best in class
5
Harvest King: Farm Defense TDA
Free + IAP · ★ 4.8 · 2,685 ratings · score 88 · excellent
6
Evo DefenseA
Free + IAP · ★ 4.7 · 9,498 ratings · score 87 · excellent
7
Merge Kingdoms - Tower DefenseA
Free download · ★ 4.8 · 2,127 ratings · score 85 · excellent
8
Fort GuardianA
Free + IAP · ★ 4.4 · 5,870 ratings · score 85 · excellent
9
AmaZeus: Merge & ShootA
Free + IAP · ★ 4.6 · 1,920 ratings · score 84 · excellent
10
Slime LegionA
Free download · ★ 4.8 · 4,957 ratings · score 83 · excellent
11
Random Dice: DefenseA
Free download · ★ 4.6 · 53,005 ratings · score 82 · excellent
12
Combo Clash - Era WarsB
Free download · ★ 4.5 · 2,805 ratings · score 81 · good
13
Mega Tower - Casual TD GameB
Free download · ★ 4.6 · 5,186 ratings · score 79 · good
14
Power Painter: Shoot & DefenseB
Free + IAP · ★ 4.6 · 47,551 ratings · score 77 · good
15
Merge Plants - Monster DefenseB
Free download · ★ 4.4 · 2,122 ratings · score 72 · good
16
Zombies vs. TowersC
Free + IAP · ★ 4.6 · 13,699 ratings · score 69 · situational · provisional
17
Shooting Tower: Defense GameC
Free · ★ 4.7 · 15,903 ratings · score 68 · situational
18
Plants on FireC
Free download · ★ 4.8 · 2,434 ratings · score 68 · situational · provisional
19
Penguin GO! - CollabC
Free download · ★ 4.6 · 3,337 ratings · score 67 · situational · provisional
20
King God Castle: Luminous FateC
Free download · ★ 4.6 · 1,928 ratings · score 66 · situational · provisional
21
Rush Arena - Clash Battle TDD
Free + IAP · ★ 4.5 · 2,021 ratings · score 60 · weak · provisional

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Questions people ask

What is the best merge defense game app for iPhone?: Merge Clash: Tower Defense, S tier, ranked #1 of 21, rated 4.8 by 14,173 people.
Which merge defense game apps are free?: 21 of 21 are free to download: Merge Clash: Tower Defense (S), Ammo Fever: Tower Gun Defense (S), Fortress Merge (S), Lucky Defense! (S) and more. 8 of them sell in-app purchases. 1 reports no in-app purchases.
Which merge defense game app has the best App Store rating?: Plants on Fire at 4.8 from 2,434 ratings.
How many merge defense game apps reach S or A tier?: 11 of 21. Tiers follow fixed score bands: S from 90, A from 80, B from 70, C from 60, D from 50, F below. The list's leader is S if it scores 80 or more. On a list of 20 or more ranked apps, a tier from S to D takes in new apps only up to a quarter of the top 40: an app pushed out of a full tier falls to the next tier with room, and F takes the rest. An app already in a tier keeps its place while the tier is at most 2 apps over a quarter; past that, only the apps over that margin go down, lowest score first. Equal scores share a tier, and no app has a better tier than an app ranked above it. An app keeps its tier until its score passes the band edge by more than 1 point, or a full tier or the order above moves it. Only the top 40 of a list get a tier.