Lanternwright

Pacing Companion

Web app, works offline, health diary

Coming soon Working name

A pacing and symptom diary for people with post-exertional malaise, built to work on bad days.

Pacing Companion's Today screen on a phone, asking How is your energy right now? with five large buttons from Very low to Good, and Some selected.
The daily check-in. Each tap saves on its own, so a check-in still counts on a rough day.

Where it stands

Feature-complete for a first beta. Before launch it needs a final name, the production signing key, a contact address for free codes and a short legal review of its privacy pages.

Pacing Companion is an offline web app for people with ME/CFS, long COVID, POTS or other conditions where overdoing it costs days. Check in with one tap, plan your day around an energy envelope you set, see patterns in what you logged, and print a one-page summary to take to appointments.

Who it's for

People with ME/CFS, long COVID, POTS or other conditions where overdoing it costs days, who want a calm, low-effort way to track and plan.

What it does

  • A one-tap daily check-in built for bad days: energy, symptoms, a crash or flare mark and a note, each saved on its own tap, and "same as yesterday" in one tap.
  • An energy envelope planner with your own activity costs. Going over gets a gentle note, never a warning. No streaks and no scores.
  • Patterns that describe what you logged, including each crash or flare with the three days before it.
  • A one-page summary to print or save as a PDF for appointments.
  • Made for low-energy days: large targets, light, dark and high-contrast themes, bigger text, reduced motion and full keyboard and screen reader support.
  • Works offline with no account, with JSON backup, CSV export and import, and delete everything.

More screenshots

Pacing Companion's Patterns screen for the last 30 days: days checked in, crash or flare days, days with activities logged, days over the energy envelope and average points done, with a note that patterns describe your entries and don't explain why anything happened.
Patterns describe what you logged, and don't try to explain it. The entries here are sample data.

What it keeps, and where

Nothing you enter leaves your device unless you save or share a file yourself. The app has no account, no analytics and no third-party code, and it makes no network requests of its own.

Network use
None of its own.
What reaches Lanternwright
Nothing.

The full Pacing Companion privacy section

Questions

Does it collect my data?
No. Everything you enter stays in your browser's storage on your device. There's no account, no analytics and no third-party code, and it makes no network requests of its own.
Is it medical advice?
No. It's a personal diary and planning tool. Its patterns describe what you logged and never claim to know why something happened.
What if I can't pay for a supporter code?
Ask for a free one. No questions and no proof needed. Everything important is free without a code anyway.

Pacing Companion is a personal diary and planning tool. It is not a medical device and does not give medical advice.