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The instrument

One signal in. Five ways to read it.

The phone records all day. The wide screen reads it back once a week. These screenshots show the tool.

Vayl Hub on the web: a thirty-day recovery curve with the current reading at 35 milliseconds and a gold NOW marker, over a row of signal tiles for energy, nutrition, weight, hydration and workout, each with its value and its own sparkline, then a blood panel with each marker against its published reference band and a capture-coverage column for the last seven days
Hub · the recovery curve, and the signals under it

01Home

Six in the morning, before the day has done anything to you.

You open the phone and the day is already laid out: what is due, at what time, in which part of the day. You mark what you did with one thumb. Nothing reorders itself while you are looking at it.

  • Morning, afternoon and night, each holding what belongs to it
  • Log something late and it keeps the day it actually happened on
  • Alchemy timing: every day, chosen weekdays, or every N days
The day, 00 to 24Sample shape
06:30 · morning readings07:00 · first intake07:30 · breakfast09:30 · strength session12:00 · lunch15:00 · intra17:30 · zone 219:30 · dinner21:00 · measurements22:00 · evening intake23:00 · sleep window
0006121824
Morning 4Afternoon 2Night 5

Eleven entries at real clock positions. Night carries more than afternoon, which is what the grouping is for.

The Vayl iPhone Day screen: hydration at 1,000 of 5,000 milliliters with quick add buttons, the day split into morning, afternoon and night with the count due in each, then the nutrition and training entries for today, over the five module tabs
iPhone · records it

NeverNo guilt, no motivation. Vayl never reorders your day or tells you what to do next.

02Training

Between one set and the next, one hand free, no signal.

That is when you log the set you just did, drop sets included, and the app has to answer on the first tap. On Sunday, on the wide screen, you look at thirteen weeks at once and see whether the block did what it promised.

  • 155 exercises, 15 cardio types, four disciplines in one log
  • A lift is measured in load, a ride is measured in effort, neither becomes points
  • Cardio session load: RPE times minutes (Foster)
Thirteen weeksSample shape
FewerMoreSessions per day

114 sessions across 13 weeks. The empty column is a week that did not happen, and it stays empty.

Editing a training template on the Vayl iPhone app: four chest exercises, each with its sets, rep range and rest, and how its sets run: normal, drop set, bi-set and myo-reps
iPhone · records it
Vayl Training on the web: the strength, cross and cardio tabs, weekly Zone 2 minutes against the weekly reference, a thirteen-week frequency grid and a logbook
Web · reads it backThirteen weeks in one picture, and every session still openable underneath.

NeverNo generated program, no coaching cue. The board is not a leaderboard.

03Nutrition

Sunday night, setting up a week you have not lived yet.

Monday can run a plan Sunday never sees, and each plan carries its own macros and its own water. Weeks later the wide screen tells you how many days you actually logged, with the denominator printed next to it.

  • 8,631 foods with macros. Scan packaged food.
  • A plan can expire on its own, so a finished week does not quietly continue
  • The day you missed is drawn as loud as the day you logged
Ninety days, one cell eachSample shape
59/ 90 days
capturednot captured31 missing, and they stay missing

A filled cell is a day that was captured, an outline is a day that was not. The 59 of 90 is the count the capture below prints; which days fell where is illustrative. Nothing is averaged into a percentage.

The Vayl iPhone Nutrition plan tab: saved meals and supplements, the active plan with its calories, protein, carbs and fat, and the weekly schedule that applies it to every day
iPhone · records it
Vayl Nutrition on the web: how many of the last ninety days were actually logged, with the days that were not drawn at the same weight as the days that were
Web · reads it backHow many days you actually captured, with the denominator printed.

NeverNo projected deficit, no food scored good or bad. A missing day is shown missing, never averaged over.

04Body

The first minute awake, before you are properly awake.

Last night arrived from the watch while you slept. You read it stage by stage, each one printed next to the reference proportion it is compared with, and you decide what today is worth. The ninety days behind it are waiting on the wide screen.

  • Sleep stages, variability, resting rate, blood pressure, VO2max
  • 284 lab markers across the years
  • Skinfolds, bioimpedance, DEXA fields, photos, left side against right
Last night, 23:09 to 06:00Sample shape
Deep
1h 22m 21% 15–20%
REM
1h 51m 28% 20–25%
Light
3h 22m 51% 40–60%
Awake
0h 15m 4% <10%

A sample night. Two of the four readings sit outside the reference proportion Vayl prints for each stage.

Body signs on the Vayl iPhone app: last night’s sleep with duration, efficiency and stages, resting heart rate, blood pressure and fasting glucose
iPhone · records it
Vayl Body on the web: the wall of signal groups over a calendar window, each channel a curve on its own scale
Web · reads it backEvery channel on its own scale, over the window you choose.

NeverNo sleep score, no readiness ring. A photo pair is a comparison, never a rating.

05Alchemy

Ten at night, the same time as yesterday, and the day before that.

The reminder arrives because you set that cadence, not because something guessed at it. Behind the reminder sits the pharmacology: half-life, what has accumulated, and how much is left at the rhythm you are actually keeping.

  • 4,012 substances, 3,090 of them everyday medication, searchable by trade name
  • One compartment, first order, summed per entry, and it says modeled mass rather than a blood level
  • Half-life from the literature or from yours, and the screen tells you which one it used
What accumulates, at that cadenceModeled
day 1day 7day 14

One compartment, first order, superposed. 80 mg every 24 h, half-life 24 h. Plateau 160 mg at the peak and 80 mg at the trough. Modeled mass, never a blood level.

Setting a cadence on the Vayl iPhone app: an ongoing phase from June 7, daily at 22:00 shown as a row of dots across the month, with weekdays and interval as the other two options, and the amount per intake and per week
iPhone · records it

NeverNo recommendation, no suggestion, nothing pre-filled. Every curve shows where its half-life comes from, including when no source is linked to it.

The reveal

A chart you cannot ask questions of is decoration.

This is the product's own chart, running here on the page. The beam sweeps once and the signal appears behind it. Put the cursor anywhere on the line and it gives you the exact value and the exact day.

Spectrum

Five signals, four months, one axis.

Four months of one athlete in the web terminal, five channels. The bright line is a seven day average, which makes a jumpy signal readable.

Point anywhere and the same day lights up on all five at once, with how many of them were really measured that day. Before a signal starts, the floor is dotted. Vayl lays them side by side and stops there.

MeasuredOne athlete · 120 days · five signalsLast reading · 28 Jul

Each signal drawn by its position in his own range.

  • 4,012

    substances

  • 8,631

    foods

  • 155

    exercises

  • 284

    lab markers

Counted in the catalog on 2026-07-27

Access

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