The instrument

Built for the
serious climb

Every position you already hold, surface by surface. See it, plan it, keep the record, and share it, all without leaving the climb.

Vantage. The whole instrument in one frame.

Every open position drawn against its route, in a single glance.

Under the surface

Built to
terminal standard

A tracker just shows you a number. An instrument earns the bar: it streams in real time, it can never touch your funds, it runs from the keyboard, and it would rather mark a figure stale than fake it.

Resilience

Never wrong, never dark

If the socket drops, REST takes over in seconds. When a price can no longer be trusted, it is marked stale, never guessed.

REST fallback · 10sstale · never guesseddivergence guard · 30s
BTC/USDC$66,210live
Read-only

It can never trade for you

Read-only keys. It reads every position and can touch nothing, no order and no withdrawal, ever.

Connection · read-only
Read positions and balances
Place or cancel an order
Withdraw or move funds

Keys live only in your macOS Keychain. Never in a backup, never on a server.

Keyboard

The whole climb, no mouse

⌘1 to 6 jump elevations, ⌘N and ⌘K open the composer and compass, and every surface has its own keys. Built for people who live in terminals.

⌘1–6elevations
⌘Ncomposer
⌘Kcompass
Tthesis
Sshare
⌘Sstill
Precision

Numbers are never faked

Every figure comes from the venue, never invented to fill a gap. When a reading cannot be trusted, it is marked stale instead of guessed.

SOL · close$74.31estimated

A close the venue cannot confirm lands estimated, then self-heals to the exact figure when the venue returns. Never a fake number.

Streaming

The fill, the moment it happens

Your positions stream straight from the venue's own socket. A fill shows in Tarn the instant it lands, not on the next refresh.

Listening to the venue socket
BTC SHORT1.5 BTC openedstreamed
ETH LONG12 ETH openedstreamed
SOL LONG320 SOL openedstreamed
An open snow-covered summit under a bright sky
Trail · The honest record

Every climb is kept.
Even the falls.

The losses are where the practice is
A darkened massif under heavy cloud
Vantage · Resilience

Never wrong.
Never dark.

Correct, or honestly marked stale
Distant peaks on the horizon at first light
Horizon · The watch ahead

Watch the level,
not the noise.

Calm until the moment matters
The ascent

From plan to
reflection

Six elevations, walked in order. Provision, climb, and keep the record of every move.

01

Provision at Camp

Set the day’s intention and plan the climb before you take a single position.

02

Climb on Summit

Hold every position against its route. See exactly where you stand, always.

03

Reflect on Trail

Every climb preserved, win or loss, with the thesis you traded on.

Built in the open

Shipped,
not promised

There is no roadmap to point at. Only the instrument as it stands today, every line built and run by the maker before it ships to you.

  1. The first ascent

    Camp to Summit. The instrument runs owned outright, entirely on your hardware.

  2. Trail

    Every closed climb kept with the thesis you traded on, win or loss, so the record can be read instead of relived.

  3. Honest degradation

    When a price can no longer be trusted, the instrument marks it stale rather than guessing. Never wrong, never dark.

  4. Money mask

    Clouds every figure for a screenshot while prices and percentages stay live. Your size, never public.

  5. Hyperliquid, read-only

    A third venue connected. Positions, entries and liquidation levels drawn on the same route as everything else.

Every line here was used by the maker before it reached you. That is the only proof Tarn offers, and the only one that matters.

A darkened massif under heavy cloud
Get Tarn

Begin the climb.

Install the instrument · the permit brings it live