Questions about
Trace.

Trace is a glucose understanding platform designed to help people better understand the relationship between food, movement, sleep, routine, and glucose over time.

Rather than focusing purely on isolated readings or clinical targets, Trace looks at the bigger picture — helping you understand the shape, rhythm, and coherence of your glucose experience.

Trace is designed to feel calm, reflective, and personal. It is built around the idea that understanding your own patterns is often more valuable than comparing yourself to somebody else's averages.

Trace is for people who want to better understand how their body responds to everyday life.

Many Trace users wear continuous glucose monitors (CGMs), including people living with diabetes, athletes, and people interested in metabolic health and performance.

Trace is intentionally designed to feel less clinical than traditional health software. It is built for real life — meals, routines, movement, sleep, habits, stress, travel, and everything in between. You do not need to be highly technical to use Trace.

Most glucose apps focus heavily on numbers, alerts, averages, and isolated events. Trace focuses on patterns, context, and personal understanding.

Rather than comparing you endlessly against population norms, Trace is designed around a much simpler question:

How does your body tend to respond?

Trace learns from your own data over time — your meals, your routines, your glucose patterns, your responses. The goal is not to judge your glucose. The goal is to help you understand it.

Trace brings together live glucose, meals and food patterns, sleep, activity and workouts, long-term trends, personal food responses, and editorial-style daily interpretation.

It helps you see how your glucose behaves, how different foods affect you personally, how stable or reactive different days feel, and how routines influence your glucose over time. Over time, Trace builds a richer understanding of your personal glucose patterns and uses this to provide more contextual and individualised insight.

No. While many Trace users live with diabetes and use CGM technology, Trace is fundamentally designed around glucose understanding rather than a specific diagnosis.

Some users are interested in metabolic health, athletic performance, meal response, energy stability, and long-term glucose patterns. Trace is designed to adapt to the individual using it.

No. Trace is intentionally designed around personal context rather than population comparison. Your glucose patterns are influenced by your body, your lifestyle, your meals, your activity, your routines, your sleep, your stress, and your goals.

Trace focuses primarily on helping you understand your own patterns, trends, and responses over time. The philosophy is simple:

Better understanding yourself is usually more useful than comparing yourself to strangers.

No. Trace is not designed around perfection, punishment, or constant correction. It is designed to help you notice patterns, understand your responses, and build a clearer picture of how your body behaves over time.

We believe health software should support reflection and understanding — not constant pressure.

Glycemic Flow® is Trace's way of describing the overall rhythm, stability, and coherence of glucose movement across the day.

Two days can produce similar averages and Time in Range scores while feeling completely different. One day may feel smooth, predictable, stable, and effortless — another may feel reactive, fragmented, difficult to settle, and mentally exhausting.

Glycemic Flow® helps make those differences visible. It is designed to capture the experience of glucose movement — not just isolated numbers.

Because most people living closely with glucose already know that glucose is about more than averages. A stable day often feels different from a day filled with rebounds, corrections, swings, and unpredictability — even if traditional metrics appear similar.

Glycemic Flow® helps you recognise smoother routines, disruptive patterns, foods that work well for you, and habits associated with more stable glucose experiences. Importantly, Trace focuses on your patterns over time — not whether you match somebody else's "perfect" graph.

You will need an iPhone and a compatible continuous glucose monitor (CGM). Trace connects to your glucose data source during setup — for most people this takes just a few minutes.

Trace can also integrate with Apple Health to provide additional context around sleep, workouts, and historical glucose patterns.

Trace supports several connection methods. The simplest depends on your CGM:

Dexcom users — sign in with the email and password you use for your Dexcom account. Trace stores this securely so it can keep fetching your readings in the background, even when the app isn't open.

FreeStyle Libre users — sign in with your LibreLinkUp email and password. Trace stores this the same way, for the same reason.

Other CGM users — Zukka provides a reliable way to forward live glucose data to Trace. Trace guides you through the connection step by step during onboarding.

Nightscout users — connect your existing Nightscout instance directly. No need to change your current setup.

Yes. Trace connects directly to your existing Nightscout setup — just choose the Nightscout option during onboarding and enter your URL and credentials. Many people continue using Nightscout alongside Trace, with each serving slightly different purposes.

Apple Health is optional but recommended. Trace uses it to read sleep times (for Overnight Context), workout data, and historical glucose where available. The more context Trace has, the richer the interpretation it can provide.

Each day, Trace assembles a review of yesterday's glucose patterns and has it written by an AI designed to interpret metabolic rhythm rather than report raw numbers.

The review covers your Glycemic Flow® score, Time in Range, average glucose, notable episodes, and key patterns — written as a short, readable narrative rather than a clinical report.

Between 5am and 11am, if yesterday's Daily Review is available, Trace shows a Morning Reflection card at the top of your Today screen.

It opens with yesterday's Glycemic Flow® score and the most characterful sentence from the AI review. Below that is a compact metric strip showing Time in Range, average glucose, and any notable episodes. A short bridge section then brings you to this morning — your current reading, grounded in yesterday's pattern.

Each morning, Trace analyses your overnight glucose window — anchored to your actual sleep and wake times from Apple Health rather than a fixed clock interval.

It produces an Overnight Stability score from 0 to 100, notes the glucose band width overnight, and compares it to your recent average. A history of previous overnight analyses is also available so you can see how overnight stability shifts over time.

Yes — carefully. AI in Trace is used to write the Daily Review narrative, interpret meal photos, and identify patterns in your glucose data.

Trace is intentionally designed to avoid alarmist language, judgement, overconfident conclusions, and generic optimisation advice. The purpose of AI in Trace is not to tell you who you should be. It is to help you better understand how you respond.

Trace includes a personal Food Library that becomes more useful over time. You can scan food barcodes, add foods manually, save favourite meals, attach photos, and store nutritional information.

Over time, Trace also learns how foods tend to affect you personally — which meals feel stable, which produce sharper responses, and how similar meals have affected your glucose previously. The Food Library becomes increasingly personalised the more you use it.

Yes. Trace can analyse meal photos to help estimate carbohydrates, fat and protein — useful when a meal doesn't have a clear numerical breakdown. Photos also serve as a personal record, making it easier to recall what you ate when reviewing a glucose pattern later.

This uses a third-party AI service, so it's off by default. The first time you try it, Trace asks you to explicitly turn it on; you can switch it off again at any time in Settings. Manual entry, barcode scanning, and search-based logging don't require this and work the same either way.

Yes. The Trends tab takes a longer view of your glucose patterns across days and weeks. It includes Metabolic Rhythm — a 30-day view of which days of the week tend to produce smoother or more variable glucose — alongside a Glycemic Flow® history calendar and key metric trends.

Trends requires sufficient historical data and fills in gradually as Trace builds a longer picture of your patterns.

Yes. Trace supports five alert types: urgent low, low, high, rapid rise, and rapid fall. Each has a configurable threshold and a smart cooldown so a single episode doesn't produce a continuous stream of notifications.

Alerts are available when Trace has a live CGM connection. In passive mode — where Trace reads from Apple Health — alerts are not available, as the data doesn't arrive in real time.

Trace Live is a shared web view of your current glucose — a calm, read-only window your partner, parent, or carer can open in any browser without installing anything or creating an account.

To share, tap "Share Trace Live" in Settings and use the iOS share sheet to send the link. A live glucose connection must be active before a sharing link can be created. Each link is unique to your account — share only with people you trust.

Yes. The Trace Watch app shows your current reading, trend arrow, a sparkline, Time in Range, and average glucose. It requires your iPhone to be nearby — it is not designed to work standalone.

Trace also offers Watch complications: a large rectangular complication with reading, trend, age, and sparkline; and a corner complication with reading, trend, and Glycemic Flow® score. There is also a Contact complication — Trace creates a "Trace CGM" contact and updates it with your reading every few minutes, which you add to your watch face using Apple's built-in Contacts complication.

Yes. When a live connection is active, Trace runs a Live Activity showing your current reading, trend arrow, and a mini sparkline on your Lock Screen and in the Dynamic Island. iOS surfaces this automatically in CarPlay when you connect — there is no separate CarPlay setup.

Trace also offers a Nightstand widget designed for StandBy mode — the large-format view when your iPhone is propped up on its side while charging. It fetches readings directly from the Trace server every five minutes, independent of the main app.

Trace is currently available for iPhone only. We may explore Android support in the future.

Protecting your data is extremely important to us. Trace is designed with privacy and security as core principles. Your data is encrypted during transmission, securely stored, never sold to advertisers, and always controlled by you. You can manage connected services and sharing permissions at any time from within the app.

If you connect via Dexcom or LibreLinkUp, Trace securely stores your password on Trace servers in order to retrieve readings on your behalf — including when the app is not open. Your password is encrypted using AES-GCM before storage and the encryption key is never stored alongside it.

This server-side storage is necessary because Dexcom and LibreLinkUp do not offer a push-based API — readings must be actively requested at regular intervals. You can remove your stored credentials at any time from Settings.

Trace Premium is £7.99/month or £79.99/year, with a 14-day free trial so you can try it with your own data before you're charged.

Trace is coming to the App Store. This page will link straight to the listing as soon as it's live.