Track
Enter the BHB reading from your meter with its time and context, and Loopa pairs it with a glucose reading taken close to it for your GKI.
“I test my ketones most mornings, and the numbers sit in a notes app with nothing beside them to explain them.”
See what moves with your ketones.
Metabolic Insights is where Loopa keeps your blood ketone readings: it pairs each one with a glucose reading for your glucose ketone index and compares them with the rest of your day.
Your ketones and GKI, beside the food, fasting, sleep and weight you already log.
14 days of everything, no card. Then $59.99 billed once a year ($5 a month), or $12.99 a month.
Track, connect, adjust
Bring food, fitness, health measurements and personal protocols together so people can track what happened, connect patterns and make better-informed adjustments.
Connect
Each reading sits beside the food, fasting, sleep, exercise and weight around it, and the charts put them on the same dates.
Adjust
See which patterns hold up in your own readings and which do not, then take them to your clinician or coach.
Blood ketones rise when carbohydrate is scarce, such as during a fast or on a very low-carbohydrate diet, and the glucose ketone index expresses glucose and ketones as a single ratio.12
Within your first session you’ll have your first ketone reading logged and paired with a glucose reading for your GKI.
Everything free for 14 days. Then Loopa Basic, or $5 a month.
Every new member gets all of Loopa Premium free for 14 days, with no card. Invite one family member or friend in your first 14 days, and when they create their Loopa account through your invite your trial grows by 14 days, up to 30 in all. When your free days end, your account moves to Loopa Basic, which is free, unless you subscribe to keep all of Premium, and nothing is ever deleted.
- Loopa Premium$59.99 a year ($5 a month) or $12.99 a month. One person.
- Loopa Premium Family$99.99 a year or $19.99 a month. Up to six people.
- Loopa BasicFree, after the free days end. One person.
Launch price: $39.99 a year for Premium and $69.99 a year for Family, until January 23, 2027, and you keep it for as long as you stay subscribed.
Loopa Basic is free, with no end date: basic food entry; weight, blood pressure, pulse and heart rate; 30 days of reports; body photos; the help library; the community and forums; Apple Health or Health Connect sync; and exporting your own data. Everything else is Premium.
Start tracking ketones See plans and prices
Subscriptions renew automatically at the price shown until you cancel. Cancel at least 24 hours before renewal in your App Store or Google Play account settings, or at loopa.mobieus.io/subscription for a plan bought on the web. The trial needs no card, so nothing is charged unless you choose a plan. 30-day money-back guarantee: if you decide Loopa is not for you within 30 days of your first payment, we refund the pro-rated amount. For a plan bought on the web or in Google Play, email support@mobieus.io and we refund you. Apple handles App Store refunds, at reportaproblem.apple.com.
Log a reading
Your meter’s number, with the day around it
Ketones live beside everything else you track, not in a notes app.
Log ketones
A reading in a few seconds
Tap Log a ketone reading and enter the BHB number from your meter, from 0 to 10 mmol/L. Loopa stamps the time, and you can add the context and a note.
Testing at the same times each day? A Ketone check reminder opens straight to the entry sheet.
- Fasting, before or after a meal, before or after exercise, bedtime or on waking
- A note up to 280 characters
- A Ketone check reminder that opens the sheet
- Edit or delete a reading whenever you like
Glucose ketone index
Paired with your glucose for you
A GKI only means something when the glucose and ketone readings were taken together, so Loopa finds the pair. Automatic uses your nearest glucose reading within 15 minutes, or within 30 if there is none closer. Or enter the glucose from the same test, or choose one from a list showing how many minutes away each one is.
Edit or delete that glucose later and the GKI follows it. With nothing close enough, the GKI says “No data” rather than guessing.2
- Glucose in mg/dL ÷ 18.016 ÷ ketones in mmol/L
- Automatic, entered or chosen pairing
- A glucose you enter is saved to your vitals too
- No target, no range, no color for good or bad
Every reading in context
Tap a reading and see the day around it
The things that tend to move ketones, gathered for you from what you already log.
The 24 hours before
Net carbs, carbs, fiber, protein, fat and energy logged in the day before the reading, and how long since your last meal.
Whether you were in a fast
A fast you timed in Loopa, and how many hours into it you were when you tested.
The night before
Last night’s sleep and your resting heart rate, from Apple Health or Health Connect.
Exercise and steps
Exercise in the 24 hours before the reading and your steps that day.
Your nearest weigh-in
The weight closest to the reading, and how it changed over the week before.
Your own 30-day medians
Ketones, GKI, glucose, sleep, resting heart rate and weight, compared with nobody else’s.
Trends and comparisons
Three ways to look at it
Over 7 days, 30 days, 90 days, 6 months, a year or dates you choose.
Trend and Compare
Your measures on the same dates
Trend draws one measure on its own: ketones, GKI, blood glucose, weight, sleep, net carbs, calories eaten, fasting hours, exercise minutes, resting heart rate or steps.
Compare stacks two to four of them on one date axis, each on its own scale, so a ketone curve and a sleep curve are never squeezed onto one set of units.
- Eleven measures to choose from
- Two to four stacked, each with its own scale
- Ranges from a week to a year, or your own dates
Scatter
Ketones against one thing at a time
Put your ketones or GKI against net carbs in the 24 hours before, last night’s sleep, how long you had been fasting or your weight change over seven days, and see every paired reading as a point.
The number of paired readings sits beside the chart, with Loopa’s own sentence describing what the points show.
- Ketones or GKI on one axis
- Food, fasting, sleep, exercise or weight on the other
- The count of paired readings, always shown
What moves together
Patterns that have to earn their place
The part most trackers leave to you and a chart.
The relationship explorer
Checked against your own readings
Loopa compares your ketones and GKI with food in the meal before and over the previous 6, 12 and 24 hours, exercise in the day before, last night’s sleep, how long you had been fasting and your weight, and lists what tends to rise and fall together, strongest first.
Run enough comparisons on anybody’s data and a few look meaningful by chance. Loopa corrects for that with the Benjamini-Hochberg method, a standard adjustment for testing many things at once, so when it says “No relationship found” it means it.5
- Every comparison corrected for chance, together
- Strongest first, with the number of readings behind each
- “No relationship found” is an answer, not an error
- A missing window is left out, never counted as zero
Why am I seeing this?
Every pattern shows its working
Tap any pattern for what was compared, the time window, how many readings it rests on, how many were missing and which method was used.
A pattern describes readings that tended to go together. It does not show that one led to the other, and Loopa never suggests changing your food, fasting, exercise or medication because of one.
- What was compared, and over which window
- Readings used and readings missing
- The method, and why it was chosen
- A reminder that it is an association
| What you see | What it takes |
|---|---|
| Not enough data yet | Fewer than 10 paired readings |
| No relationship found | Nothing stands out once every comparison is taken into account |
| Weak, possible or moderate | 10 or more paired readings, by strength |
| Stronger recurring pattern | 20 or more paired readings and a clear signal |
Why it is built this way
Ketones move with your day, so they are shown with it
Ketones answer to food, fasting and movement
The liver makes ketone bodies when carbohydrate is scarce, during a fast or on a very low-carbohydrate diet, and the body burns them for fuel, including during exercise.1 A single reading says little on its own; readings logged beside those things over weeks say more.
A GKI with no zones
The glucose ketone index was described alongside a calculator built to follow metabolic therapy.2 A 2026 commentary calls it a compelling hypothesis that still needs clinical validation and recommends n-of-1 study of one person’s own readings over time.3 That is why Loopa compares your GKI with your own earlier numbers.
Exercise is in the picture
In a randomized crossover study, exercise at the start of a 36-hour fast raised beta-hydroxybutyrate compared with not exercising.4 Studies describe groups of people; the explorer looks only at you.
Ketone tracking elsewhere
Most food trackers stop at keto macros
What the other trackers on our comparison pages say about ketones, from their own pages and store listings.
A log, a GKI and a test
Loopa logs the reading, pairs the glucose, then tests every comparison together and tells you which patterns hold up and which do not, beside your food, fasting, workouts, protocols and weight in one app.
On the vendors’ own pages
Cronometer: imports blood ketones and glucose from a Keto-Mojo meter; Gold charts them against nutrients (checked October 29, 2026). We found no test of whether a pattern holds up described on its pages; a chart is read by eye.
On the other trackers we compare
MyFitnessPal, Fitia, Lose It! and Noom do not describe logging a blood ketone reading or a GKI in their store listings. A listing is not proof a feature is absent, so the comparison pages show these as not verified.
Compare trackersWhat you use for metabolic insights
All of it is in Loopa Premium, and all of it is yours for the first 14 days.
- Metabolic Insights - blood ketones and the glucose ketone index
- Intermittent fasting
- Vitals
- Food search
- Apple Health and Health Connect sync
- Clinician share report
What it costs
Everything free for 14 days. Then Loopa Basic, or $5 a month.
Every new member gets all of Loopa Premium free for 14 days, with no card. Invite one family member or friend in your first 14 days, and when they create their Loopa account through your invite your trial grows by 14 days, up to 30 in all. When your free days end, your account moves to Loopa Basic, which is free, unless you subscribe to keep all of Premium, and nothing is ever deleted.
Included in Loopa Premium
Metabolic Insights
Nothing is deleted if Premium ends. Rejoin and every reading is there.
- Blood ketone (BHB) logging with context and notes
- Your GKI, paired with glucose automatically or by you
- Latest cards and your own 30-day baselines
- Trend, Compare and Scatter over any range
- What moves together, corrected for chance
- Ketone check reminders
- CSV export and a section in your clinician report
Free for 14 days, then $5 a month
- No card to start, and nothing charged unless you choose a plan
- One person who signs up through your invite: up to 30 days free
- $59.99 a year ($5 a month), or $12.99 a month
- Loopa Premium Family: up to six people, $99.99 a year
- Launch price $39.99 a year, kept for as long as you stay subscribed
- Your records stay yours to view and export, always
Subscriptions renew automatically at the price shown until you cancel. Cancel at least 24 hours before renewal in your App Store or Google Play account settings, or at loopa.mobieus.io/subscription for a plan bought on the web. The trial needs no card, so nothing is charged unless you choose a plan. 30-day money-back guarantee: if you decide Loopa is not for you within 30 days of your first payment, we refund the pro-rated amount. For a plan bought on the web or in Google Play, email support@mobieus.io and we refund you. Apple handles App Store refunds, at reportaproblem.apple.com.
Keep reading
What to look at next
FAQ
Questions about Metabolic Insights
The ones people ask before they test.
Does Loopa sync ketones from my meter or my watch?
No. Apple Health and Health Connect have no blood ketone type, so a ketone reading is entered in Loopa, which takes a few seconds. Glucose, sleep, activity and weight from your connected sources are used as they arrive, so the rest of the picture fills itself in.
What is a good GKI?
Loopa does not say. Published GKI zones came out of brain cancer research and are still being studied, so Loopa shows your GKI beside your own earlier readings, with no target, no range and no color for good or bad, and leaves what it means for you to a conversation with your clinician.
How is the GKI worked out?
Glucose in mg/dL, divided by 18.016, divided by ketones in mmol/L: the formula from the published GKI calculator. A glucose of 90 mg/dL with ketones of 1.0 mmol/L gives 5.0. Loopa pairs each ketone reading with the nearest glucose reading within 15 minutes, or within 30 if there is none closer, or uses the one you enter or choose.
Why does my GKI say “No data”?
There was no glucose reading within 30 minutes of the ketone reading, or the ketone reading was 0, which cannot be divided by. Enter the glucose from the same test, or choose a nearby reading, and the GKI appears.
How many readings before Loopa finds a pattern?
Ten paired readings before it describes a relationship at all, and twenty before it will call one a stronger recurring pattern. Under ten it says “Not enough data yet”, and when nothing stands out it says “No relationship found”.
Do I need to be on keto or fasting to use it?
No. Metabolic Insights works with whatever you already log in Loopa. If you time fasts with the fasting timer, those fasts appear beside your readings; if you do not, the fasting columns stay empty rather than reading zero.
Can I share my readings with my clinician?
Yes. Export readings (CSV) builds a spreadsheet of every reading with its time, context, paired glucose, GKI and note, and you can add a Metabolic Insights section to the report you share with your clinician. It is off until you turn it on.
Is Metabolic Insights part of Loopa Basic?
No, it is part of Loopa Premium and Loopa Premium Family, and every new member gets all of Premium free for the first 14 days, with no card. After that, Loopa Premium is $59.99 a year ($5 a month) or $12.99 a month. Loopa Premium Family covers up to six people for $99.99 a year or $19.99 a month. Or keep Loopa Basic, free. If Premium ends, Metabolic Insights locks and nothing is deleted: rejoin and every reading is where you left it.
Research
Where the method comes from
The formula, the statistics and the background on this page, with links to the papers.
- Evans M, Cogan KE, Egan B. Metabolism of ketone bodies during exercise and training: physiological basis for exogenous supplementation. The Journal of Physiology 2017;595(9):2857–2871. Read it
- Meidenbauer JJ, Mukherjee P, Seyfried TN. The glucose ketone index calculator: a simple tool to monitor therapeutic efficacy for metabolic management of brain cancer. Nutrition & Metabolism 2015;12:12. Read it
- Bischof E. The glucose ketone index: a compelling mechanistic hypothesis on the path to clinical validation. Frontiers in Science 2026;4:1939897. Read it
- Deru LS, Bikman BT, Davidson LE, et al. The effects of exercise on beta-hydroxybutyrate concentrations over a 36-h fast: a randomized crossover study. Medicine & Science in Sports & Exercise 2021;53(9):1987–1998. Read it
- Benjamini Y, Hochberg Y. Controlling the false discovery rate: a practical and powerful approach to multiple testing. Journal of the Royal Statistical Society, Series B 1995;57(1):289–300. Read it
Sources
- Metabolism of ketone bodies during exercise and training: physiological basis for exogenous supplementation. The Journal of Physiology, 2017. https://doi.org/10.1113/JP273185
- The glucose ketone index calculator: a simple tool to monitor therapeutic efficacy for metabolic management of brain cancer. Nutrition & Metabolism, 2015. https://doi.org/10.1186/s12986-015-0009-2
Loopa records what you log and shows it back to you. It does not diagnose or treat anything, and decisions about your care stay with you and your clinician.
Bring your meter
Log this morning’s reading and see it beside your day. All of Loopa Premium is free for your first 14 days, with no card.