Launching summer 2026 · iOS

What your body needs today is not what it needed last week.

Your sport. Your training. Your goal. Your age. Your hormones. Your watch. Your diet. Blitz reads all of it, and builds your nutrition targets every morning, grounded in 350+ peer-reviewed papers.

Start your fueling check

2 minutes. Today’s target, the floor, and the why. Free.

Launching summer 2026.

350+ peer-reviewed papers · 5 wearable platforms mapped · 8 safety signals monitored

Adaptive sports nutrition for people who train with intention.
Built for the bodies most apps were never calibrated for.

The problem

You show up. You track. And still, nothing adds up.

Data everywhere. No plan.

The watch reads your biology. The app plans your meals. They have never spoken to each other.

Tracking apps

Read your biology. Cannot plan your meals.

StepsHRV Sleep scoreResting HR Calories burnedRecovery %
Wearables · Recovery trackers · Smart watches
Planning apps

Plan your meals. Cannot read your biology.

Calories inMacro split Meal logsRecipe library Weight goalAdherence streak
Calorie counters · Macro trackers · Diet apps
Woman running into morning sun on a quiet road
Fig. 01 — Tuesday, 06:42
02 · The gap

So you piece it together. Paste your numbers into a chat window. Read a study. Ask a coach. The plan you assemble is plausible — and unaware of your cycle phase, your sleep last night, or the fact that your protein threshold shifted at 40.

For women at any life stage, and athletes over 40, the gap is widest. And it is invisible.

Blitz closes it.

Three cyclists on a gravel road at first light
The thesis

Every signal you give. One plan out. Every morning.

Fig. 02 — One ride, three biologies
01 · Your cycle, calculated

Your cycle changes your fuel needs every two weeks.

During the luteal phase, resting metabolic rate rises, protein oxidation accelerates, and carbohydrate needs shift. Blitz adjusts automatically — and calibrates to your individual response over multiple cycles, not a population average. Three contraception models — natural cycling, hormonal IUD, hormonal contraception. Irregular cycles, perimenopause, menopause — all handled. No diagnosis required.

02 · Your age, accounted for

Your body changed at 40. Your tools didn't. Nobody told you.

After 40, muscle protein synthesis requires a higher threshold to activate. At 52, that means 17.5% more protein per day. Recovery compresses. Hydration instinct weakens. A 52-year-old and a 32-year-old with the same weight and training get meaningfully different plans. No other nutrition app uses this.

03 · Your safety, monitored

The only nutrition app that will tell you to eat more.

Fuel Match monitors 8 signals continuously. If your fuelling drops below your personalised floor, it overrides every other feature. No recommendation reaches you without its approval. It runs whether you open the app or not.

04 · Your morning. Your training. Reconciled.

Most apps wait for you to log. Blitz asks before you start.

Every morning you tell Blitz what you will train. Your plan is built before you start, not back-calculated after. When the session ends, Blitz reads your watch and your log, and reconciles the day. Meal anchors shift around your sessions — pre, between, post — to the gram. Most apps know what you did. Blitz knows what you will do — and what to eat next.

05 · Every number, explained

Not a black box. A bibliography.

When Blitz says 143g protein, you can ask why. The answer traces through your profile, your cycle phase, your age, your training, and the published study behind the calculation. 350+ citations. Every threshold maps to a paper.

Fuel Match

Eight signals. One answer to one question: is your fuelling where it should be?

The 8 signals
01Fuel status
02Subjective wellness
03Menstrual patterns
04Heart rate variability
05Resting heart rate
06Training load
07Nutrition behaviour
08Body weight trend

Three of these eight come from your watch. Blitz reads Apple Watch, Garmin, Whoop, Oura, and Polar automatically.

56
Studies, peer-reviewed
Your self-reported wellness still outweighs your wearable data.

Fifty-six studies confirm athletes sense a problem before their watch does. Blitz trusts that — and asks how you are doing before it changes a single number.

The invisible gap

Three people. Three bodies. Three plans that should not look the same.

Sarah, 29, triathlete

Her luteal phase started two days ago.

Her protein oxidation has increased. The app she uses shows the same targets as last week.

Marc, 52, runs to stay sharp

His muscles need 17.5% more protein than at 35.

His five-hour meeting gap is costing him lean mass. His calorie tracker says he is on target.

Priya, 44, perimenopause

Her caloric needs have not decreased. They have increased.

Her disrupted sleep and her nutrition are connected. No app she uses knows this.

They do not know what their body needs right now. They do not have time to figure it out. Blitz does.

From the threads

You are not the only one asking.

Questions Blitz was built for.

My training is consistent but I lost my period and don't feel like I'm undereating — how is that possible?

r/XXRunning

I'm a man in my mid-40s and my recovery has gotten worse. My joints hurt for longer. I think this is limiting my potential gains.

r/AdvancedFitness

Everything I read about nutrition for menopause says to cut calories — but I'm training hard and feel terrible when I do that. What should I actually eat?

r/Menopause

I eat a large, late lunch around 1pm but then I'm borderline low on energy by 6pm when it's time to swim or run.

r/triathlon

I just felt like shit and couldn't figure out why.

r/climbharder
The product

Your morning. Your plan. Your proof.

Transparent adaptive intelligence

A serious athlete does not need another dashboard. They need the decision: what changed, what to eat next, and why.

Blitz SwiftUI onboarding screen showing two planned training sessions
01 Observe

First, Blitz understands the day.

Two sessions, cycle phase, recovery, meals, and device signals are context before they become advice.

Blitz SwiftUI Today screen showing recovery window, protein, carbohydrate and fat targets
02 Decide

Then it makes the morning decision.

Protein, carbs, fat, timing, and planned sessions sit in one view, ranked by safety, recovery, performance, and adherence.

Blitz SwiftUI food logging screen opened from a recovery meal action
03 Act

The advice becomes the next action.

Pre-fuel, recovery meals, food logging, and corrections should feel like one continuation of the plan, not another app to manage.

Blitz SwiftUI Today screen showing an expanded Day 22 luteal phase signal chain
04 Explain

Nothing changes without a trace.

Tap Why? or an adjustment to see the signal chain: Day 22, luteal context, training load, and the reason behind the change.

Every number in Blitz has a trace. Tap any target to see the calculation and the study behind it.

The evidence

Every threshold traces to a study. Where evidence is limited, that is acknowledged.

350+
Peer-reviewed papers
5
Wearable platforms mapped for support
8
Signals monitored by Fuel Match
0
Competitors covering all 7 capabilities
Cycle-aware · Age-stratified · Safety · Prospective planning · Daily plans · Meal-gap detection · Explainability
Every threshold traces to a study. Where evidence is limited, that is acknowledged.
A note from the founder

Built for everyone who shows up for their body — race day or Tuesday morning. Built by someone who trained hard, ate wrong, and could not find a tool that understood why. — Vaidehi Bhatia · Founder, Blitz

Join the waitlist

Sports nutrition for the body you actually have.

Blitz does the figuring. You do the training.

Launching summer 2026.
Noted. You will hear from Blitz when it is ready.