Nutrition · Protein
The protein tracker app that does the counting.
Made in the UK by Bolt Business Limited, company number 16864050 · No ads, no trackers
Health AI is a protein tracker app for iPhone. It sets a daily protein target from your weight, counts every gram you log and shows how much is left today. Log a meal from a photo of your plate, a nutrition label, a barcode or the UK's own food tables.
- 3 days free
- Then £9.99 a month
- Cancel any time in your Apple account
Your target
How much protein should you eat a day?
The UK's Reference Nutrient Intake for adults is 0.75 g of protein per kilogram of body weight a day: about 56 g for men and 45 g for women. For athletes, the American College of Sports Medicine suggests 1.2 to 2.0 g per kilogram, while the Department of Health has advised adults to avoid more than twice the reference intake.
The UK figures are the Department of Health's, from 1991, and the athlete range is the American College of Sports Medicine's, as set out in the British Nutrition Foundation's guide to protein.
How Health AI sets your target, split by split
Health AI works your target out from your weight and the macro split you pick when you start. Pick the Balanced split the app recommends and you start at 1.5 g per kilogram: twice the UK reference intake, the most the Department of Health advises, and within the American College of Sports Medicine's range for athletes.
Above a BMI of 25, only a third of the weight over that line counts. Worked out for you, the target is capped at 35% of your calories but never set below 0.8 g per kilogram, and follows your weigh-ins until you set your calories or any macro yourself, by hand or from What you actually burn. If you don't train, you can set a lower target in Nutrition → Settings → Protein.
| Macro split | Protein per kg of body weight | A day at 70 kg |
|---|---|---|
| Balanced (the app's default) | 1.5 g | 105 g |
| High Protein | 2.2 g | 154 g |
| Low Carb | 2.0 g | 140 g |
| High Carb | 1.5 g | 105 g |
| Keto | 1.5 g | 105 g |
At 70 kg with a BMI under 25, unless that would be more than 35% of your calories. High Protein and Low Carb go past the UK advice on purpose, for people who choose more protein. If you are pregnant, breastfeeding, or have kidney disease or another medical condition, ask your GP or a dietitian what your number should be.
See the grams left on Home, your widgets and the new watch app
On Home, a ring counts down the grams you still need, such as "48 g protein left", and says Done when you get there. The diary shows protein against your target, and every food you logged says what it added.
Home's brief says it in words, "75 g of protein to go", and the same number is on your Home Screen widgets, the rectangular Lock Screen widget and the Apple Watch app, which is new and still being tested. If you allow it, each day's protein is saved to Apple Health too.
No ads or trackers, saved to your phone first, kept in London
Your food log stays yours.
No adverts or trackers
Nothing in the app follows you to other apps or websites.
On your phone first
Everything you log is written to your phone first, and the built-in foods search with no signal. Scans and the coach need a connection.
Kept in London
Signed in, your log is copied to your account, stored in London, and it exports whenever you like.
- 3 days free
- Then £9.99 a month
- Cancel any time in your Apple account
Cancel at least 24 hours before the three days are up and you pay nothing.
Logging
How do you track protein intake?
Log what you eat and let the app do the counting. Photograph the plate, scan the nutrition label or the barcode, or search the UK's food tables, and check each entry before it is saved. Health AI adds up the protein in every food you log and shows the grams left against your target.
Four ways to log protein, and which to use for what
A photo scan estimates the whole plate's protein from what it can see, with a note on what was hardest to judge. A label scan reads the panel itself, with fibre, sugar and salt. Barcodes are looked up in Open Food Facts and USDA's branded foods, and never use one of your scans. Search covers 2,854 foods from CoFID, the UK government's own food tables, and 7,793 more from the USDA, even with no signal.
| What you are eating | Log it with | Where the protein figure comes from |
|---|---|---|
| A yoghurt, a protein bar, a ready meal | The barcode, or the label if it will not scan | The maker's own figures |
| A meal you cooked | A photo of the plate | An estimate of the whole plate, for you to check |
| Chicken breast, eggs, lentils | Search | The UK's food tables (CoFID), or the USDA's |
| The breakfast you have every day | A saved meal | Whatever you saved, added in one go |
| A number you already know | Quick add | You |
The coach reads your last 30 days of food
The coach reads your protein target and how much protein you ate each day for the last 30 days, today included. Ask what to have for dinner and the answer is about your numbers, not anyone's.
Its answers can come with buttons that open a food, so you choose the portion before anything goes in your diary. It never logs anything itself.
Training too? The workout tracker keeps your sets here, and the running app records your runs. Counting every calorie? See the calorie counter and the macro tracker. See everything Health AI does.
What £9.99 a month includes, and what keeps working if you stop
| What you get | 3 free days | £9.99 a month | If you stop paying |
|---|---|---|---|
| Meal and label scans | 30 | 200 a month | No |
| Barcodes, search and logging by hand | Yes | Yes | Yes |
| Messages to the coach | 50 | 300 a month | No |
Barcodes, search and saved meals never use a scan. One plan, with no higher tier, and one free trial per Apple ID. Whatever you logged stays yours if you stop paying.
One target, worked out
Two protein targets, as the app sets them.
Follow the sums for someone of 70 kg, and someone of 95 kg
Questions
Protein tracking, answered.
Is there a free protein tracker app?
Many are free with adverts, or free with a paid tier. Health AI is three days free, then £9.99 a month, with no adverts. If you stop paying, logging by hand and scanning barcodes keep working.
What is the best protein tracker app?
The one you will keep using. If protein is all you count, a simpler app may do. Health AI suits people who also count calories, lift or run, with one app for all of it.
How do I cancel the free trial?
In your iPhone's Settings → your name → Subscriptions. Cancel at least 24 hours before the three days end and you pay nothing.
Can an app count protein from a photo?
It can estimate it. Health AI's scan works out the whole plate's protein from what it can see, with a note on what was hardest to judge. For anything packaged, the barcode or label gives the maker's own figures.
Can I set my own protein target?
Yes, in Nutrition → Settings → Protein. Anything under 0.8 g per kilogram is raised to that floor, and a target you set stays put when you log a new weight.
Does it know UK foods?
Yes. It has 2,854 foods from CoFID, the UK government's food composition tables, and scans barcodes against Open Food Facts, which lists many UK products.
On the App Store in the UK, for iPhone with iOS 17 or later. Screens show sample data.
Every gram, counted for you.
Protein, calories, training and runs in one app, with a coach that reads your last 30 days of all four.
- 3 days free
- Then £9.99 a month
- Cancel any time in your Apple account
Cancel at least 24 hours before the three days are up and you pay nothing.