Best 9 Fermentation Logs in 2026: Sourdough, Kombucha & More

Sourdough Tracker is the best fermentation log for sourdough bakers. It keeps starters alive with one‑tap feeding and reminders. We tested and ranked the top mobile apps for tracking sourdough, homebrew, kombucha, and other fermented foods so you can find the right fermentation log fast.

Quick comparison table

Use this scannable snapshot to jump to the app that matches your ferment.

1. Sourdough Tracker: Crust

Best for: sourdough bakers who want a healthy starter without the mental load.

This app makes starter care as simple as one tap. After you set up your starter, just hit “Fed!” when you feed it. The app resets a countdown timer so you always know when the next feeding is due. Gentle reminders pop up at the right time, so missed feedings stop being a worry. The feeding history is clear and easy to scan, you can pause starters during baking breaks, and you can even add multiple starters with their own names and icons. A little mascot grows with each feeding, just a small nudge to keep you consistent. It’s iOS only, and for sourdough, it’s the fermentation log we’d recommend first.

• Add multiple starters with custom names and icons.
• One‑tap feeding resets a countdown timer automatically.
• Push notifications that prevent missed feedings.
• Full feeding history and pause mode for baking lulls.
• Playful mascot that rewards consistent feedings.

Get Sourdough Tracker

2. Fermolog: Home Brewing App

Best for: homebrewers tracking gravity‑driven ferments like beer, wine, and mead.

Fermolog plots your gravity readings onto clean visual charts, so you can watch fermentation move from primary to bottle. Log your original gravity, follow the curve, and manage several batches at once without mixing up stages. The multi‑stage manager tracks additions, racking, and conditioning, and the gravity chart with milestones shows you how close a brew is to target at a glance. If you want fermentation data without wrestling spreadsheets, this is it.

3. Kombucha Brew Tracker

Best for: kombucha brewers managing two‑stage fermentation and bottling schedules.

This app uses labelled timers to sync first and second fermentation. You set your F1 and F2 times, and it nudges you when it’s time to bottle. It logs offline in cellars and pantries, so no signal is no problem. The dual timer makes it tough to bottle early and easy to remember tasting windows. It’s a fermentation log that moves at kombucha’s pace.

4. Loaflo: Sourdough Starter

Best for: bakers who want AI‑powered loaf diagnostics alongside starter tracking.

Loaflo goes beyond starter feedings and hydration logs. Take a photo of your loaf’s crust and crumb, and the app gives you an AI score plus feedback on structure and fermentation. The feeding log is tidy, but the real draw is that photo‑to‑feedback loop. It connects what you see in the bake to how you’ve been managing the starter, so every loaf teaches you something.

5. FERMNTR

Best for: advanced homebrewers syncing digital hydrometers for real‑time fermentation data.

FERMNTR links with digital hydrometers to stream gravity and temperature readings into a live fermentation curve. You set up recipes with multi‑step profiles and watch the data come in on its own, no manual entry needed. Colour‑coded graphs help you spot activity changes, stalls, or when fermentation is done. It’s a detailed fermentation log for beer, cider, mead, or wine that gives you lab‑style visibility.

6. Sourdough Baker AI: Bake Great

Best for: Android users who want AI photo feedback and unit conversion in one sourdough tool.

Snap a bread photo and the AI gives you a read on crust colour, crumb structure, and overall bake quality. The built‑in recipe manager tracks adjustments like hydration changes and flour blends, and the measurement converter handles grams, ounces, cups, and tablespoons on the fly. For Android bakers who learn by seeing, this fermentation log works as a personal coach and record keeper.

7. Brew Meister: Measure & Manage

Best for: homebrewers who want precision measurements from a density meter on their phone.

Brew Meister connects straight to digital density meters, so readings show up in the app with no typing. You can watch gravity changes over time, compare batches side by side, and export full measurement data if you want to dig deeper. That direct meter‑to‑app link cuts out transcription mistakes and leaves you with a clean fermentation log you can share or store.

8. HomeBrew Keeper

Best for: calendar‑focused brewers who analyze every stage of fermentation.

HomeBrew Keeper builds a brewing calendar that links every log entry to a fermentation phase. It captures additions, temperature shifts, and gravity readings along a timeline, and an analytics dashboard shows patterns across batches. The calendar view lets you see at a glance when a ferment should peak, dry‑hop, or cold‑crash, so it’s a solid fermentation log for planning and consistency.

9. FermentMe

Best for: food fermenters aging kimchi, kraut, and kombucha with tasting reminders.

FermentMe handles ferments that don’t fit the brewing or baking categories. Log ingredients and photos for each jar, and set push notifications that prompt you to taste, not just follow a date. It treats fermentation as a living thing, nudging you to check flavour development rather than sticking to a rigid schedule. If you need one fermentation log for sauerkraut, hot sauce, and kombucha, this app covers it.

How we picked these apps

We tested every app during real ferments: feeding starters, running brew days, cycling kombucha batches, and aging vegetable ferments. We looked for reliable reminders, a clean interface, offline access, and whether the core features were genuinely free. We also checked that each app was built for its specific ferment type, not a generic notebook. Apps without recent updates got crossed off. Sourdough Tracker came out on top because it tackles the biggest hassle—keeping a starter alive—with almost no effort, which is what a great fermentation log should do.

Frequently asked questions

What’s the best fermentation log app for beginners?

If you bake sourdough, start with Sourdough Tracker. Its one‑tap feeding and reminders make starter care simple. For brewing, Fermolog’s gravity logs are easy to follow. FermentMe handles food ferments with a simple photo journal. All three give you the core features for free.

Do these apps work offline?

Yes, plenty log offline. Kombucha Brew Tracker and FermentMe work fully without an internet connection. Loaflo and Sourdough Baker AI need a signal for the AI photo analysis, but you can still track your ferments offline.

How do I prevent my sourdough starter from dying?

Use a fermentation log that sends reminders. Sourdough Tracker displays a countdown timer and alerts you precisely when it’s time to feed, so you won’t miss a cycle. Loaflo’s feeding log can also help you keep a steady hydration and schedule.

The verdict

Sourdough Tracker: Crust is our top pick for regular sourdough bakers. It takes the mental load out of starter care with gentle reminders and one‑tap logging, so your starter stays fed and active without any guilt. Brewers and food fermenters have solid options in Fermolog, FermentMe, and the rest. If you want a sourdough fermentation log that just works, start here. Get Sourdough Tracker