The infinity bottle app · now on the App Store

Every house has a blend.
This one is yours.

An infinity bottle is a whiskey blend that never empties: pour in from bottles you love, pour out a glass now and then, and it slowly becomes yours alone. Thief & Blend keeps the books, every pour, the live proof, the blended mash bill, and how much of the very first pour still survives.

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$6.99 ONE TIME · NO SUBSCRIPTION · NO ACCOUNTS · NO TRACKING

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The math your notebook can't do

Blend two whiskeys on paper and watch the proof land. This is the exact math the app runs live on every pour, before you commit it. Nothing to sign up for, nothing to close.

Your blend
101.7
6.0 OZ · PROOF
67% EAGLE RARE 10 · 33% BOOKER'S

THE APP DOES FAR MORE: EDITS, SPLITS, MERGES, HEADROOM, THE SHIP OF THESEUS

The app

A ledger, not a notebook

Everything is stored as pours, not totals. That one decision means you can edit any entry ever, and the whole bottle recalculates instantly. The apps that came before this got that wrong, and it is why they break.

The ledger

Fix entry 12 without deleting 13 through 47

Every pour in, pour out, split, and splash of water is an entry. Edit any of them, ever, and everything downstream recalculates. No cascading deletes, no starting over.

Live proof

Know before you pour

Type the pour and watch the proof move, 106.7 to 108.4, before you commit. The headroom readout goes further: "you can add 3.4 oz of Booker's before crossing 110."

Ship of Theseus

How much of pour one survives

The meter tracks every original pour as the bottle turns over. When the last drop of the first whiskey is gone, the app marks the moment. Still the same bottle, mostly.

Split & merge

One bottle becomes two

Split off a second bottle and it inherits the exact blend and full lineage. Merge bottles back and the accounting stays honest, nothing counted twice.

Gift a pour

The blend travels with the whiskey

Give a friend 4 ounces and send the data with it. They start their bottle in the app with your full lineage, and both bottles diverge from that day. Family trees for whiskey.

Adopt a bottle

Already two years in? Good.

Start from your best guess of what is in the bottle today, and the ledger runs forward from there. You do not have to pretend you are starting fresh.

Sandbox

Taste it on paper first

Stack hypothetical pours and watch the blend move without committing anything. Commit the plan or throw it away.

Mash bill, honestly

Unknown stays unknown

The blended mash bill covers only pours with published or estimated recipes, and says exactly how much of the bottle that is. No made-up numbers padding the chart.

The pour card

Made for the group chat

Every pour generates a share card: what went in, the proof move, the composition, and the Theseus line. The house blend of you.

Merge

And two become one again

Pour one bottle into another and the accounting stays honest. Lineage passes through untouched, so a split and a merge back land exactly where they started. Nothing counted twice.

The river

Your bottle's biography

A stacked chart of what your bottle has been made of, across its whole life. Watch a whiskey arrive, dominate for a year, and slowly recede.

Rate it

Find out what you actually like

Rate the blend as it changes and see your scores charted against proof. Over a year it stops being a guess and starts being evidence.

Backup

Nothing to lose

Export the whole ledger, checksummed, and restore it on any device. A tampered or truncated file fails loudly rather than importing something wrong.

Privacy

No accounts, nothing watching

Your bottle lives on your phone. No signup, no analytics, no servers of ours holding your data. Export everything as JSON whenever you want.

Shipping fast

What ships first, what's next

Version 1.0 · shipped, and on the App Store now

Multiple bottles and the fully editable ledger. Live proof on every pour before you commit it, and the headroom readout. Split a bottle, merge two back together, or gift a pour with its whole lineage attached. Adopt a bottle you already have. Sandbox mode. The Ship of Theseus meter. Blended mash bill across 200 whiskeys with honest coverage. Tasting notes stamped with proof, and the ratings charted against it. The composition river, your bottle's biography as a chart. Milestones. The pour card. Full export and restore.

The reverse solver

"I want 105 proof with more rye. What do I add, and how much?" The app works the problem backward from your shelf. Nobody has this. It is the next thing being built.

Public bottle pages

Publish a read-only page of your bottle: composition, proof history, the full lineage. A link worth putting in a bio.

Follow bottles

Follow a friend's bottle and hear about the moments that matter: proof crossings, first-time whiskeys, milestones. Never every pour.

NFC tap-to-log

A sticker on the physical bottle. Tap your phone to it and the right ledger opens, already waiting.

Android

On the roadmap. The engine is cross-platform on purpose.

The blending school

Everything about whiskey blending, free

42 plain-language guides and 5 working calculators: how to start an infinity bottle, how to blend at home, what the math means, what the labels mean, what happens inside the bottle, and where the tradition comes from. Somebody would sell you this as a course. Here it is instead. No signup, no email capture, not ever.

Starting out 6 GUIDES

The math 5 GUIDES

Blending at home 8 GUIDES

Inside the bottle 5 GUIDES

Tasting and collecting 5 GUIDES

Reference 5 GUIDES

Sharing it 4 GUIDES

The tradition 4 GUIDES

Calculators 5 TOOLS

Browse the whole school, laid out as a bottle →

FAQ

Questions people actually ask

What is an infinity bottle?
An ongoing personal whiskey blend. You pour in a little from bottles you love, pour out a glass now and then, and the bottle never empties. Over months it becomes a blend of everything you have ever added, in shrinking proportion. Thief & Blend keeps the books: what went in, what came out, and exactly what the bottle is now. Full guide →
How do I start one?
A clean 750ml decanter, 2 to 4 ounces each from two or three whiskeys you genuinely like, and a record of what went in. The record is the whole game, and it is what the app does automatically, including the proof math. How to start this weekend →
How do you calculate the proof of a blend?
Multiply each whiskey's volume by its proof, add them up, and divide by total volume. 4 oz of 90 proof plus 2 oz of 125 proof lands at 101.7. The calculator above runs it live, and the app does it on every pour before you commit. The math, fully explained →
Can I edit a past entry, or do I have to start over?
Edit anything, ever. The app stores your bottle as a ledger of pours rather than a running total, so changing entry 12 simply recalculates 13 onward. The older apps in this category store the total and mutate it, which is why fixing a mistake there means deleting everything after it, and why they slow down and crash past 150 entries. This one does not.
What does "Ship of Theseus" mean here?
The old thought experiment: if you replace every plank of a ship, is it the same ship? Your bottle lives that question. The meter shows what percentage of each original pour still physically remains, correct even across splits and merges. When nothing of the first pour is left, the app marks the day. The Theseus guide →
Does whiskey go bad or oxidize in an infinity bottle?
Whiskey does not age in glass, but a bottle with lots of air space does slowly change character, usually softening. An infinity bottle handles this better than most open bottles because you keep topping it up, which keeps the air gap small. Keep it out of sunlight and away from heat. What actually happens inside →
What whiskeys should go in, and what should stay out?
House rules vary, and that is the fun. Common ones: nothing you would not drink on its own, nothing heavily peated unless the whole bottle is going that way, and pour in the good stuff, not the dregs you are trying to get rid of. The blend is only ever as good as what you feed it. House rules guide →
Can I give some of my bottle to a friend?
Yes, and the data goes with it. Gift 4 ounces and the app generates a code carrying the blend, the proof, and the full lineage. Your friend starts their bottle from your pour, both bottles diverge from that day, and the family tree is recorded. It is the best housewarming gift in whiskey.
What is a whiskey thief?
The copper tube distillers use to pull a sample straight from a barrel. You cover the vent with your thumb, lift, and release the pour into a glass. It is the taking tool, the blend is the making, and the app is named for both halves of the ritual. More on the thief →
How much does it cost?
$6.99, once. Buy it and it is yours: every feature, every bottle, every update. No subscription, no ads, no second tier, no "premium" anything. Charging monthly rent on your own whiskey notes would be ridiculous.
Does the app collect my data? Why no accounts?
No. Your bottle lives on your phone: no signup, no analytics, no servers of ours holding anything. There is nothing to log into because there is nothing watching. You can export your entire history as JSON at any time, because it is yours.
Where can I get it, and is Android coming?
Thief & Blend is on the App Store now for iPhone, as a one-time $6.99 purchase. Android is on the roadmap, and the engine was built cross-platform on purpose, so it is a port rather than a rewrite.

Start the house blend

On the App Store now, for iPhone. Your first pour takes thirty seconds, and the bottle remembers forever.

DOWNLOAD FOR iOS · $6.99

ONE-TIME PURCHASE · NO SUBSCRIPTION · ANDROID ON THE ROADMAP