Pacer+

A gentle activity, energy and symptom tracker for people with ME/CFS.

Built around pacing and avoiding post-exertional malaise — to help you understand your limits, reduce crashes, and live more sustainably day to day.

Made with care for people who know what a good day can cost.

Join the waiting list

What Pacer+ is

Living with ME/CFS often means working within an energy limit that is smaller, and less predictable, than the one you had before. Spend beyond it and the cost can arrive a day or two later, as a crash.

Pacing is the practice of staying within that limit on purpose — noticing what activity costs you, and spreading it out so you crash less often. Post-exertional malaise, or PEM, is that delayed payback after doing too much. Avoiding it is the whole point of pacing, and the whole point of Pacer+.

Pacer+ is a quiet tool for doing that. You log activities, energy and symptoms in a few taps; it helps you see the patterns and notice when you may be heading past your limit — gently, before the crash, not after.

It is not a one-size-fits-all threshold. Over your first couple of weeks, Pacer+ learns your own energy envelope from what you log, so the picture it gives you is shaped around you — not an average of someone else.

Gentle by design

A tracker for people who are often unwell has to be careful. The wrong design choice doesn't just annoy someone — it can cost them energy they could not spare. So Pacer+ is built around a few firm principles.

No streaks, no guilt There are no streaks to maintain and no "you missed a day" messages. Rest is not a failure, and the app will never treat it as one.
No alarms When Pacer+ notices you may be overdoing it, it says so quietly, in warm language. An alarming warning is itself a stressor — so there aren't any.
One-tap logging Logging is meant to be quick and low-effort. If something common takes more than a few taps, that is treated as a bug.
Backdating is easy People often log when they are well enough, not when something happened. Recording an activity for earlier today, or yesterday, is simple and expected.
Easy on the eyes Dark mode, a highly legible typeface, and calm, slow motion — Pacer+ honours your device's reduced-motion setting by default.

Who it's for

Pacer+ is being built for:

People living with ME/CFS who pace, or would like to.
People with long COVID and other energy-limiting conditions where pacing helps.
Anyone who wants a calm, private record of their energy and symptoms over time.

A read-only view for a nominated carer is planned for the future, but is not available yet. Pacer+ is also not a medical device and does not give medical advice — it is a tool for noticing your own patterns, to use alongside the people who care for you.

Right now Pacer+ is in private testing: a small, hand-picked group, so we can make sure it is gentle and solid before more people rely on it. The waiting list is how you let us know you would like to be one of the next people in.

Questions

Is it free?

Yes — Pacer+ is free to use during testing. If that ever changes, we will tell you clearly and well in advance, never quietly.

Is my health data safe?

Your symptoms, energy and activity logs are treated as special-category health data. They are held in an isolated, encrypted database, and we do not sell your data or share it with insurers, employers or anyone else. You can read exactly what we store, and ask for it to be deleted, in our privacy policy.

Do I need a smartwatch or fitness tracker?

No — Pacer+ works fully with quick manual logging, and always will. A wearable is never required. That said, optional sync is coming soon: you will be able to bring in heart-rate variability, resting heart rate and sleep from a connected device, so Pacer+ can notice a crash forming a little earlier. It will always be your choice whether to turn that on.

Is there an app to install?

Pacer+ runs in your web browser, so there is nothing to download from an app store. On a phone you can add it to your home screen, where it behaves like an ordinary app.

Can I share what I track with my doctor?

A plain-language summary you can take to a GP appointment is a planned feature: a clear picture of your activity, symptoms and any crashes over recent weeks, designed to be readable in a short consultation. It is not available yet, but it is one of the things Pacer+ is being built towards.

When will I get access?

We are letting people in slowly, a few at a time, so the experience stays calm and solid for everyone already using it. There is no fixed date — but if you join the waiting list, we will email you when a place is ready for you. There is nothing to keep up with in the meantime.

Join the waiting list

Add your email and we will let you know when a place is ready for you. There is no deadline, and nothing to keep up with.