Everything DayByDay does
Built for the full journey.
The three-phase journey
Most weight-loss apps drop you off at "goal reached." DayByDay travels the whole road.
- Loss mode — Smoothed trends, projected goal dates with confidence bands, body-fat % projections, milestone celebrations, titration-aware coach.
- Maintenance mode — Maintenance Range card replaces Goal Progress. Tracks drift from goal, in-range streaks, 30-day variability, and milestones at 30, 90, 180, 365, and 730 days at goal.
- Regain mode — If weight drifts back above your maintenance band, the app gently flags it and surfaces comeback-oriented guidance. No shame. Just the data and a path forward.
The Dayo AI Coach adjusts its tone and recommendations based on the phase you're in.
Weight & body composition
- Daily weight logging with smoothed trend line
- Goal weight + body-fat % goal with projected estimates
- Multi-layered trend charts (raw, smoothed, weekly highs/lows)
- BMI, BMR, lean mass, metabolic age, RFM, WHtR, FFMI gauges
- Maintenance Range card (drift from goal, in-range streaks, 30-day variability)
- Progress photos timeline with weight + dose stamped on each (private, encrypted, optional cloud sync)
- DEXA scan integration — body fat %, lean mass, bone density, T-score, visceral fat, RMR
- Lean-mass loss warning — flags >10% drops during a GLP‑1, with protein and resistance-training guidance
- Body-composition cross-projections (BF% at goal weight, weight at goal BF%)
- Goal date prediction with confidence bands, based on your actual trend
- Upcoming milestones with estimated dates (5%, 10%, goal, custom)
- Weight history CSV import via the web app
GLP‑1 medication tracking
Track every major GLP‑1: Ozempic, Wegovy, Mounjaro, Zepbound, Saxenda, Victoza, Trulicity, Rybelsus (oral semaglutide), plus compounded semaglutide and tirzepatide.
- Live medication level with peak/trough and next-dose countdown ring
- Full dose timeline and titration history
- Injection site rotation advisor
- Compounded semaglutide & tirzepatide with optional concentration field
- Rybelsus (oral semaglutide) support — empty-stomach reminder, no injection-site picker
- Pharmacy & Refill Hub — refill cadence, pickup tracker, prior-authorization renewal warnings
- Missed-dose protocol — per-medication FDA-label guidance ("take now and stay on schedule" vs "skip and resume next week"). Free for everyone.
- Pen storage countdown — room-temp expiration per medication (Ozempic/Wegovy 28d, Mounjaro/Zepbound 21d, etc.)
- Pause / vacation mode — suspend the schedule without false alarms
- Travel-aware dose timing — schedule anchored to your home timezone
- Medication switcher — log a switch event (e.g. Semaglutide → Tirzepatide); the app and AI Coach recalibrate
- Side-effect severity (0–10) + peak day — heatmap of effect × dose
- Dose-level vs weight-loss comparison — bar chart of weekly loss per titration step
- Dose-cycle patterns — hunger, energy, mood by day-of-cycle
- Pre-dose checklist — out-of-fridge timing, site rotated, last-dose side effects logged
- Doctor-ready visit summary PDF — dose history, titration step, side-effects ranked, weight delta per dose level, A1c trend
- Titration-stall detection — flags when you've been on the same dose too long without progress
- GI symptom diary — bowel movement count and Bristol stool consistency
Dayo AI Coach (powered by Anthropic Claude)
- Daily Coach Note grounded in your last 30 days of real data
- Every claim backed by a real fact — tap "View evidence" to see the numbers
- Daily affirmation that varies day-to-day (no Groundhog Day)
- Phase-aware — tone and recommendations change between loss, maintenance, and regain
- GLP‑1 stage and cadence aware — knows your medication, current dose, weekly vs bi-weekly vs daily schedule
- Titration-stall and lean-mass-loss insights
- Schedule control — pick what time of day your Coach Note arrives
- Refresh disclosure — "Coach Note refreshes once daily — next refresh at 6:00 AM"
- Per-source opt-out — exclude any data category from what's sent to the model
- Medical disclaimer — informational, not medical advice
- Weekly Pattern Reports — on-device weekly summary, no LLM cost
Sleep & recovery
- Sleep stages breakdown — awake, REM, core, deep — time and percentage
- Sleep Score (Open Wearables) — duration, stages, consistency, interruptions, normalized 0–100
- Resilience Score (Open Wearables) — HRV coefficient of variation, normalized 0–100
- Overnight blood oxygen (SpO2), dips-per-hour, overall O2 score
- Overnight heart rate and respiratory rate
- Sleep debt tracker with personalized recovery tips
- Wellue / Viatom O2 Ring sync for detailed overnight oxygen
- Apple Health sync for sleep stages and vitals
- Coming soon: Oura, Whoop, and Garmin via Open Wearables
Exercise & vitals
- Daily steps, active calories, exercise minutes, resting heart rate
- HRV trend for cardiovascular fitness over time
- Body temperature (iOS 17+ via HealthKit)
- Steps and exercise trend charts
- BMR and total daily energy expenditure estimates
- Active-day streaks
- VO2 max (synced from Apple Health, used by AI Coach for fitness context)
Labs & daily logging
- A1c logging and trend chart
- Full panel: glucose, total cholesterol, HDL, LDL, triglycerides, AST, ALT
- Protein tracker — daily ring with a research-grounded 0.8 g/lb target
- Water intake — one-tap quick-add, with an iOS Home Screen widget
- Blood glucose with meal-time tags (fasting, pre-meal, post-meal, bedtime, random)
- Mood / State of Mind entries (iOS 17+)
- Hunger and energy sliders
- GI tracker (bowel count + Bristol consistency)
- Clothing size tracker (shirt, pants, dress sizes)
- All labs roll into the doctor-ready PDF export
iOS Home Screen & Lock Screen widgets
- Today widget (small + medium) — current weight, trend, medicine level, next-shot countdown, with milestone celebration overlay for 24h after a milestone
- Water widget — daily water total with tap-to-add Apple Intent buttons (iOS 17+); queues offline and drains when the app reopens
- Lock Screen — Streak inline — "12d streak · 187.4 lb"
- Lock Screen — Med-level circular — ring with current % of medicine in your system
- Lock Screen — Next-shot rectangular — "Next shot 2d 14h · Mounjaro 10mg"
Notifications & smart nudges
- Refill due (3 days before next pickup, then day-of)
- Prior-auth renewal (configurable 1–8 weeks before expiry)
- Missed-dose protocol (24h after expected dose)
- Streak-at-risk (8pm if no log today and streak ≥ 7)
- Titration stall (via AI Coach)
- Milestone celebrations with confetti (5 lb, 10 lb, 5%, 10%, goal, maintenance 30d / 90d / 180d / 365d / 730d)
- Per-notification opt-out in settings
Privacy & control
- Row-level security on every database table
- Encrypted at rest
- Private, encrypted Storage bucket for progress photos (local-first by default; opt in to cloud sync per photo)
- Per-source AI Coach opt-out
- One-tap full data delete
- No ads, ever — your data is never sold or used for advertising
- Apple sign-in, Google sign-in, and email all supported
Platforms
- iPhone — live on the App Store since March 2026
- Web — app.mydaybyday.app for CSV imports, account management, and cross-device review
- Android — Health Connect sync foundation in place; full release in progress