# Nature Strikes Back TD vs keep

The clearest difference is in-app purchases: keep at none against Nature Strikes Back TD's 15. keep also leads on ads (none vs shown) and update cadence (every 2 days vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Nature Strikes Back TD sells 15 in-app purchases, starting at $3.99 per 7 days. keep asks for nothing beyond the download.

Nature Strikes Back TD ships an update monthly, keep every 2 days. The most recent releases landed on October 17, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Nature Strikes Back TD | keep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (799 ratings)](https://appshunter.io/ios/app/nature-strikes-back-td/id1504190801/reviews)** | — |
| Number of ratings | **799** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 7 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GMonsters Inc.](https://appshunter.io/developer/1791868703) | [思航 赵](https://appshunter.io/developer/1624456697) |

## What reviewers say

### Nature Strikes Back TD

[App page](https://appshunter.io/ios/app/nature-strikes-back-td/id1504190801)

Defend the Heart of Nature by merging powerful guardian spirits to fight off an invading pollution army. This game combines merge, tower defense, and idle mechanics for a unique fantasy experience.

**Highlights:** Merge and unlock 70+ guardian spirits, Defend against waves of pollution enemies, Battle boss Muckmares, Recycle spirits for rewards, Idle defense and rewards, Fantasy elements and cute characters

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Subscription | $3.99 | per 7 days |
| VIP Subscription | $7.99 | per 7 days |
| 30 gems | $0.99 | one-time |
| Double Offline Earnings | $0.99 | one-time |
| Coin Bundle | $0.99 | one-time |
| Remove banner/interstitial ads | $0.99 | one-time |
| Coin Bundle | $1.99 | one-time |
| Remove banner/interstitial ads | $2.99 | one-time |
| 180 gems | $4.99 | one-time |
| Unlock Fort | $5.99 | one-time |
| Unlock Fort | $9.99 | one-time |
| 420 gems | $9.99 | one-time |
| 960 gems | $19.99 | one-time |
| 2550 gems | $49.99 | one-time |
| 5700 gems | $99.99 | one-time |

**What reviewers like**

- 💎 Amazing app
- 💎 Awesome game
- 💎 Fun little game
- 💎 Nice game

**What reviewers complain about**

- 🚫 Ads, ads, ads
- 🚫 Scam
- 🚫 Add farm
- 🚫 Forced ads even when declined
- 🚫 Decreased rewards

**Reported bugs**

- Purchased features not working
- Progression reset
- Reduced currency earning

**Requested features**

- Dark mode option
- Better ad monetization balance


### keep

[App page](https://appshunter.io/ios/app/keep-running/id6504623366)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nature Strikes Back TD free?

Nature Strikes Back TD is free to download, with in-app purchases available.

### Is keep free?

keep is free to download, with no in-app purchases.

### Do Nature Strikes Back TD or keep have ads?

Nature Strikes Back TD shows ads; keep does not.

### Which is updated more often, Nature Strikes Back TD or keep?

Nature Strikes Back TD ships an update monthly, and keep every 2 days. Most recently, Nature Strikes Back TD was updated on October 17, 2026 and keep on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*