Fuel smarter
1-tap routines · Log to workouts · Gut clarity
Store links coming soon
Built for training days
1-tap routines. Fuel on the workout.
Morning routine
Workout fuel
1-tap routines
Morning ritual, recovery shake, smoothie — set once, log in a tap when the day starts.
Log straight to workouts
Add fuel onto the session itself — pre, during, and post — so carbs sit next to the ride or run.
Set your stack once
Build the foods you actually use. Favourites and presets stay ready for race week and easy weeks alike.
Gut & sensitivity detective
Flag reactions, rank food culprits, and review the fuel window before symptoms hit.
Share meal composition
Send a short-lived code to a partner — ingredients and macros only, never GI data.
Training sync
Pull sessions from Strava, then fuel them without leaving the workout card.
1-tap & routines
- Morning ritual, recovery shake, and smoothie presets
- 1-tap log from Home for the foods already on deck
- Build once — reuse every training day
- Bookmarked favourites ready between sessions
- Portion scaling without rebuilding the meal
- Race-week and training-load aware targets
Workout fueling
- Log fuel straight onto the workout card
- Pre / intra / post slots tied to the session
- Strava sync so rides and runs show up ready to fuel
- Session fluid and carbs next to real duration
- Quick-add gels, drink mix, and stack items mid-session
- Keep gut flags off workout share — composition only elsewhere
Gut & sensitivity
- Flag reactions against meals and ingredients
- Food culprits ranking from real incident history
- Past-36h fuel window for investigations
- Compound hypothesis filters for multi-trigger days
- Known sensitivity badges on logged foods
- Stool and symptom logging alongside fuel
Day-to-day
- Colour-coded macro rings (red → orange → green → purple)
- Matching calendar dots so the week reads at a glance
- Daily readiness and hydration tracking
- Weight and cycle chips on the dashboard
- Apple Health / Health Connect weight sync
- Privacy-first meal share codes (hours, not weeks)
Daily fuel colours
See the day before you open it.
Protein, fat, carbs, and calories use the same traffic system on the rings — and the same colours as dots under each date. Glance the week, then dig in.
Way off
Under 50%Red — far below target. Day needs more fuel or a plan reset.
Getting close
50–94%Orange — climbing toward the zone. Common mid-day.
On target
95–110%Green — in the performance window for that macro.
Over
Over 110%Purple — past the band. Useful signal, not a scolding.
PROT
126/133g
FAT
83/74g
CARB
330/403g
KCAL
2585/2810
Thu 29 Oct
TodayRings show live progress. Calendar dots mirror that day’s fuel colour so race blocks and recovery weeks read at a glance.
Culprit logging
Meal or ingredient. One tap either way.
Feel something off? Flag the whole plate or pin a single line item — then watch ranked hypotheses update from real events.
Whole meal
Flag the plate
Tap the culprit icon on any meal or snack. The whole entry lands in your GI timeline — labelled MEAL.
Single ingredient
Pin the line item
Same icon on an ingredient inside the meal. Tag just the chorizo, cake slice, or gel — labelled ING.
Ranked hypotheses
Patterns, not vibes
Dairy, acid, FODMAP, soy — scores build from moderate+ events so you see what actually shows up.
1 · Flag on the meal
Snack
197 KCAL
2 · Or pin one ingredient
We Love Cake — Rooting For You Carrot Cake Slices
197 kcal · 1P · 20C · 12F
3 · Lands as MEAL or ING
Mild Spanish Chorizo Ring
Sticky Soy Chicken
The gap
Built because calorie apps weren’t built for athletes.
Calorie apps ignore the session
Logging lunch is fine. Logging gels onto a 3-hour ride — without leaving the workout — is what keeps race fuel honest.
Gut issues get treated as noise
Most apps hide symptoms in notes. ISOS connects flags to the meals and compounds that showed up before them.
Routines die in busy weeks
If it takes six taps to log electrolytes, you skip it. 1-tap presets keep the stack alive on easy and hard days alike.
How ISOS works
Three moves. Every training day.
01
Set your stack
Build morning ritual, recovery shake, smoothie, and race fuel once — the foods you actually use.
02
1-tap the day
Hit Home or the workout card. Log routines and session fuel without rebuilding meals from scratch.
03
Read the gut
When something feels off, review culprits and the past fuel window — then adjust the next block.
Where it pays off
Reasons athletes keep opening ISOS
Race week
Countdown on Home, familiar 1-tap meals, and less decision fatigue when taper nerves kick in.
Long sessions
Strava sync brings the ride in. Add gels, drink mix, and fluid on the card while the effort is still fresh.
Sensitive gut
Flag reactions, rank dairy/FODMAP/acid patterns, and stop guessing which ‘safe’ meal wasn’t.
Coach & partner
Share meal composition in hours — macros and ingredients only. Health data stays yours.
Not another diary
What you get instead of a food log
Why pay
Premium on purpose.
No ads. No selling gut data. Subscription funds the endurance product — routines, workout fuel, and sensitivity tools that stay sharp.
- 1-tap logging that survives real training weeks
- Workout-linked fuel instead of a disconnected diary
- Sensitivity detective that ranks real patterns
- Share meals without sharing health flags
- Themes, modules, and sync built for athletes
Athletes
What early athletes are saying
“1-tap morning ritual means I actually log electrolytes before the ride. That alone changed race week.”
Elena M.
Marathon · sub-3 project
“Logging gels onto the workout card beats rebuilding a meal every long session. Fuel stays honest.”
James T.
Ironman 70.3
“Culprits plus past fuel — not vibes. I finally see why ‘safe’ meals still wrecked the next day.”
Priya K.
Trail ultra
Placeholder quotes for layout — swap in real athlete lines when you have them.
Ad-free, privacy-first experience
Premium by design
Month to month
Charged on a monthly basis.
Yearly
Charged yearly for $71.99.
Every 6 months
Charged for $47.99.
Your subscription lets us ship a focused endurance product — without ads, without selling your gut data, and without diluting the experience.
- We will never serve ads or use ad networks to track you.
- Your subscription funds continuous endurance-focused product work.
- Full access to fueling, gut tools, and your data — always.
- Human support while we’re building with early athletes.
- Start with preview access before public store billing goes live.
Placeholder pricing for layout — swap in final ISOS plans when billing is ready.
Brands
Built to partner cleanly.
Nutrition, wearable, and endurance brands get a focused athlete audience — with room for co-branded fuel moments that stay privacy-safe.
Explore partnershipsReady when you are.
App Store and Google Play badges are ready — we’ll drop the real links in the moment listings go live.