Tools for people who brew coffee properly.

Cuplog Apps

Cuplog and the EY Calc are a pair of free, no-login, mobile-first apps for home brewers, café staff, and anyone who wants to understand what's actually happening in their cup.

01.

Cuplog.app

Cuplog is a recipe journal for filter coffee. Log your dose, water, ratio, grinder setting, and pour structure — then capture the results: brew-out weight, TDS, and extraction yield, all calculated on the fly.
It's aimed at anyone who's tired of keeping notes in a Notes app, losing recipes to memory, or soggy paper and a brew they can't quite recreate. Whether you're dialling in a new bag or comparing methods across roasters, Cuplog keeps everything in one place.What it does:Four-screen wizard for logging new brews
Live ratio calculator — enter any two values, the third fills itself in
Structured pour steps with running totals and auto-build
Extraction visualisations: TDS strip and EY × TDS scatter chart
One-tap export to Google Sheets (tab-separated, ready to paste)
Autocomplete on roaster, coffee, and recipe names from your own historyFull Privacy 1st design - offline — no account, no backend, no data leaves your phone.Cuplog

02.

Extraction Calculator

Link to EY Calc

EY Calc is a focused, single-purpose tool: give it your dose, beverage weight, and TDS reading, and it instantly returns your extraction yield and the weight of dissolved solids in the cup. If something looks off — a TDS entered in the wrong format, an EY that's physically implausible — it'll flag it quietly so you can double-check before you chase a ghost.Save a shot to log it locally. Copy it straight to your clipboard, ready to paste wherever you track your work. When you're done for the session, Export All pulls the full history as a clean tab-separated block.No account, no setup, no noise. It's the tool you reach for mid-session when you want a number and nothing else — particularly useful if you use a refractometer but don't need the full Cuplog workflow.Aimed at baristas, curious home brewers, and anyone who's just invested in a TDS meter and wants to know what to do with the reading.Full Privacy 1st design - offline — no account, no backend, no data leaves your phone.EY Calc

03.

Professional Customisations

Want something similar for your site or cafe operation? Get in touch to raise a request for complete control over your brew data capture, processing and export.

That's not all

Support our development

Cuplog Products are free to use.

  • We take coffee seriously. That's our commitment.

  • Good coffee is appropriately expensive

  • Find the link below and donate what you can - a brew or a bag o'beans will make our day, or whole month

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Because saying goodbye can be hard...

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We do take bribes, so any decaf, regular, rare lots, samples, knowledge or other coffee products or merch will be appreciated.