# Mad Professor Idle vs keep

The clearest difference is ads: keep at none against Mad Professor Idle's shown. Mad Professor Idle's advantage is update cadence (daily vs every 2 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Mad Professor Idle ships an update daily, keep every 2 days. The most recent releases landed on June 1, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Mad Professor Idle | keep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mad-professor-idle/id6499311291/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 2 days |
| Monetization | Ad-supported | — |
| Size | 543 MB | 7 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [NOKO GAMES YAZILIM ANONIM SIRKETI](https://appshunter.io/developer/1725343354) | [思航 赵](https://appshunter.io/developer/1624456697) |

## What reviewers say

### Mad Professor Idle

[App page](https://appshunter.io/ios/app/mad-professor-idle/id6499311291)

Become a mad scientist and conquer the world in this idle RPG. Freeze enemies with an ice gun, use their power to expand your base, and upgrade weapons. Dominate the realm with scientific prowess.

**Highlights:** Idle RPG gameplay, Freeze enemies with ice gun, Expand diabolical base, Upgrade weapons, World conquest theme

**Features:** macOS Compatibility

**In-app purchases:** none


### keep

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mad Professor Idle free?

Mad Professor Idle is free to download, with no in-app purchases.

### Is keep free?

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

### Do Mad Professor Idle or keep have ads?

Mad Professor Idle shows ads; keep does not.

### Which is updated more often, Mad Professor Idle or keep?

Mad Professor Idle ships an update daily, and keep every 2 days. Most recently, Mad Professor Idle was updated on June 1, 2026 and keep on May 16, 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.*