Announcing Tiddle: fluid balance tracking for Android

We're building Tiddle, our second Android app. It's a clean, focused fluid balance tracker for anyone who needs to log what they drink and what they pass. No subscriptions, no accounts, no data leaving your device.

The motivation behind Tiddle is the same as Vitals: we looked at what was available and found it wanting. Most apps in this space are either designed for clinical professionals and far too complex for everyday use, or they're basic hydration trackers that only log intake and ignore the output side of the picture.

Fluid balance (the difference between what goes in and what comes out) matters a great deal to a surprising number of people. Anyone managing a heart or kidney condition under fluid restriction, anyone recovering from surgery, anyone caring for a family member at home, or anyone whose clinical team has asked them to keep a record. It can also matter to athletes and anyone working in heat or physically demanding conditions.

The apps that exist for this tend to be either paper-based charts (which get lost or go undone), complex clinical systems (which are inaccessible to patients and carers), or general hydration apps (which miss the output side entirely). There's a clear gap for something simple, private, and designed for real people in real situations.

What Tiddle does

Tiddle lets you log fluid intake (what you drink, in ml or fl oz) and output (urine and bowel, with optional volume). Every entry is date and time stamped automatically. You can add a note to any entry, such as "catheter bag emptied", "unusually dark", or "protein shake after exercise", to give your records the context they need.

The history view groups everything by day, so you can see your full picture at a glance. When you need to share your records with a GP, community nurse, or hospital team, you can export to CSV, PDF, Excel, or JSON and share however is most convenient.

Like Vitals, everything stays on your device. There are no accounts to create, no cloud to trust, and no internet permission in the app. Your fluid balance data is sensitive health information, and it belongs to you.

Two apps, one approach

Tiddle and Vitals are different tools, but they share the same philosophy. Both are focused on a single job. Both are built without cloud infrastructure, accounts, or advertising. Both put the user in control of their own data.

We're not trying to build a health platform. We're building small, well-made tools that each do one thing well. The kind of tools that feel quiet and dependable: you pick up when you need them, and they get out of the way when you don't.

Tiddle is currently in development. If you're interested in sharing what you'd like to see, or you'd like to be among the first to hear when it's ready, we'd love to hear from you.