What it is
VT's AI health coach. Eir reads your whole record and answers against your own baseline, device by device, with the evidence behind each statement shown beside the reply. It describes and never diagnoses: an interpretation partner, not an alarm system.
How it works, in a sentence
Every answer is computed from your record before it is written, with the comparison window and the sources it read named on the reply, and every nutrition or supplement claim it makes, including its own suggestions, is screened through Diet-MisRAT, a peer-reviewed misinformation-risk tool that grades content on four dimensions, inaccuracy, incompleteness, deceptiveness and potential for harm, into five tiers from very low to very high; the result is shown with the reply (Ruani 2026). Before Eir reads anything, VT asks your permission to send it to a third-party AI service, and you can switch Eir off in Settings; under Oura's terms, Eir is not offered on screens whose data comes from Oura.
What it does
One Eir, five voices. The Eir you talk to reads everything: ask why a morning looked the way it did, what changed in the three months since a plan started, or what a lab result sits beside in your own history. Four focused Eirs explain one engine each, on request: Capacity Eir reads your Capacity, Sleep Eir your two sleep scores, Symptom Eir the overnight comparison, and TDEE Eir your energy expenditure, each naming what moved the result and against what. And Eir works where you are not looking: it drafts the pre-visit report from your record; when you build a supplement regimen it proposes one from your labs, your biomarkers and your goal, screens every claim, and checks each addition against the rest of what you take, including your medicines, with the interaction check on paid plans; it extracts each result from a lab report's PDF or photograph with its unit, the laboratory's range and flag, and files it for you to confirm; and it classifies the meal planner's ingredients by processing level and glycemic load.
What it will not do
Diagnose, or name a condition, even when you ask it to guess. Raise an alarm; the overnight comparison does its own reading and Eir explains it. Invent a number: when the record does not hold what you ask about, it says so. Blend devices: a ring's heart rate is read against the ring's baseline and a watch's against the watch's, never averaged. Give you advice it has not checked; nutrition and supplement claims go through Diet-MisRAT first, every time. Carry a conversation over: version 1 keeps no memory between conversations, and each one starts from your record as it stands today. Stand in for a professional: when something deserves one, Eir says so in the same words the lab flags use, take your pre-visit report to your own GP, or book a private video consultation with a doctor who works with Vitality Tracker.
The evidence it shows
Three chips on every reply: the comparison window ("Against your 12-month record"), the sources it read ("Oura, RMSSD, 348 nights"), and the check ("Diet-MisRAT: passed", or "flagged low-evidence") on any reply that made a nutrition or supplement claim; a show the data link opens the chart or table it read. A finished conversation ends with the credits it used.
Plans and AI credits
Eir runs on AI credits; every conversation and every focused read uses some, and your plan sets the monthly allowance: a small allowance on the Free plan, a working allowance for daily use on Standard, and the largest on Premium, with credits also for sale on their own at any time. The supplement regimen review with Eir is once a month on Standard and unlimited on Premium, and the interaction check is on paid plans only. The allowances and prices are on the Pricing page; during the invitation-only beta, Eir is included.
Sources
- Ruani A, Reiss MJ, Kalea AZ. Development and validation of a tool for detecting misinformation risk in diet, nutrition, and health content (Diet-MisRAT). Sci Rep 2026;16. doi:10.1038/s41598-026-40534-2
- Vitality Tracker, the Eir page (the five voices, the will-not list, the evidence chips, plans and credits); Plans and pricing (the supplement review and interaction check by plan); How it works (the consultation suggestion).