Vatlog

The year adds up against the target you set

Batches count toward the year by their packaging date. Set a target and you get a progress bar. Set no target and no bar is drawn — a bar reading "0 of nothing" tells you nothing.

At 80% and again past 100%, Vatlog shows a line of text and a warning symbol, not just a colour change. What it says is that you have passed the target you set. It does not say anything more than that.

Reference figures come with a citation and a date

For the United States and Germany, Vatlog offers reference figures as candidates, each with its statute citation and the date it was last checked. Whether to adopt one is your decision.

The reference data carries a version and a last-checked date, both shown permanently in Settings. If a figure you adopted changes, Vatlog tells you once — and never rewrites your target for you. Figures you typed in yourself never trigger that notice.

Four drinks, one ledger

• Batches — beer, wine, cider, mead; five states from planned through to archived
• Fermentation log — date, gravity, temperature and a note, charted over time
• Ingredients — fermentables, bittering, yeast, adjuncts, water treatment. Names are free text and complete from what you have entered before
• Yeast — enter the strains you use and reuse them later (no manufacturer database is bundled)
• Tasting notes and photos

Packaging happens on its own screen, and it will not go through until both the packaging date and the final volume are in — so a batch never ends up half-finished with no volume to count.

Nine calculators, published formulas only

• Alcohol by volume (standard and high-gravity formulas)
• Gravity conversion (SG ⇄ Brix ⇄ Plato)
• Hydrometer temperature correction
• Refractometer correction while alcohol is present
• Sugar addition
• Bitterness (IBU)
• Colour (SRM / EBC)
• Priming sugar
• Unit conversion

The formula version is pinned to each batch. Change a formula in Settings later and the figures already saved on a batch stay as they were. If you want them redone, you press "Recalculate with current formulas" on that batch.

Only published formulas are implemented; no third-party data set is bundled. Where a formula has a primary source — gravity conversion, refractometer correction, IBU and colour — the calculator prints it on screen. Brewing vocabulary is kept rather than watered down, and a term list is one tap away from every calculator.

Export and import

• JSON (free) — batches, logs, ingredients, tasting notes and targets. Photos are not included
• ZIP — the JSON plus your photo files. This is the one to keep when changing devices
• CSV — one for batches, one for fermentation log entries
• PDF — a page per batch, laid out for A4 or US Letter
• JSON import — adds what is missing without deleting anything already here

Every PDF carries a fixed notice: the record is self-reported and has not been verified by anyone else. It prints both the creation time from the device clock and the brew date you entered. That notice cannot be switched off.

No account. No servers. No sync.

Vatlog has no backend of its own and collects nothing. Your records are stored by iOS on your device. Not a single permission prompt appears after launch — location, photo library and notifications are all unused by design. Your region is something you choose in Settings, never inferred from where you are.

What is on the device is included in your device backup, so we do not claim that your data never leaves it. We claim only what can be checked. Files you export leave Vatlog's control once you share them.

Units and languages

Volume, temperature, gravity and mass are four independent settings. Your region suggests a starting point and nothing more — plenty of brewers in the US work in litres. Decimal separators and dates follow your language.

English, German and Japanese, switchable inside the app.

What it does not do

• No cloud sync — there is no server to sync with
• No recipe sharing or community features
• No style guideline ranges and no yeast manufacturer specification database
• No hardware integration
• It cannot verify the alcohol content of what you make