Rot & Ferment
Idle fermentation, done right
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Most idle games make you wait because waiting is the monetization lever. Rot & Ferment makes you wait because that's what fermentation actually is.
You run a small cellar: a few crocks, jars, and barrels, and a rotating cast of things worth aging - sourdough, kimchi, sauerkraut, yoghurt, kefir, tomme, cider, wine. Start a batch, and it needs real time. Minutes for a quick ferment, hours overnight, a full day for something worth the wait.
THE DECISION ISN'T "WHEN IS IT DONE" - IT'S "WHAT DESERVES THIS VESSEL RIGHT NOW"
Every batch rises in value, peaks, then slowly drifts past its best. Pull it early for safe, modest money. Hold it to the peak for the real payoff. Forget about it, and it doesn't spoil to nothing - it just costs you the upside. Nothing in this cellar punishes you for living your life.
Each recipe leans one of two ways:
• Safe - a wide, forgiving window. Never loses money, whenever you get back to it.
• Greedy - a narrow peak and a steep drop-off. Higher reward, if you're actually on time.
That choice repeats across six absence lengths, from "checking my phone right now" to "see you in the morning" - so there's always a right answer for how long you're actually going to be gone.
BUILD THE CELLAR THAT LETS YOU AGE MORE
Early recipes are ready in minutes. The long, valuable ferments - the tomme, the wine - are locked behind upgrades: more crocks, a cold cellar, humidity control. Every upgrade widens a window or slows a decay, so the game never turns into "wait less, click more." It turns into "cellar space is scarce, spend it well."
Offline the whole time? Your batches keep aging without you. Come back to a full report of what happened while you were away.
No forced ads, no pay-to-skip pressure. If a boost ever helps, it's your call, not the game's.
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New leaderboards, new cellars and new unlock art for you to enjoy.
The developer, Nils Rohwer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nils Rohwer
- Size
- 333 MB
- Category
- Simulation
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 5 more
- English, German, Japanese, Portuguese, Simplified Chinese, Spanish
- Age Rating
13+
- 13+
- Infrequent
Alcohol, Tobacco, Drug Use or References
Contains
Advertising
- In-App Purchases
Yes
- Hire a trusted carter $0.99
- Time skip $0.99
- Permanent x2 income $4.99
- Remove ads $2.99
- Buy a crock $1.99
- Copyright
- © 2026 Nils Rohwer
