u/windeigo

Sharing an app I've been building for the past couple of months.

Cassi is a diary/tracking app for parents, built mainly around breastfeeding. It logs feeds (with left/right timers), sleep, nappies, mood, growth, and general events, with an optional AI feature that looks for patterns between what the parent eats and how the baby reacts. It's expanded to cover formula and general baby diet tracking. It will also help spot anything in a parent's diet that is upsetting their own gut too.

The core problem it's solving: it's genuinely difficult to recognise which specific foods in a parent's diet might be upsetting their baby via breastmilk. The link between something you ate and a symptom days later is easy to miss. Cassi exists to make that specific link visible, you log both your own day and your baby's, side by side.

It's free to use as a manual diary (with a free PDF export to bring to a GP or paediatrician), and there's a premium tier for AI insights and photo logging. Currently in open testing on Android.

I'd really appreciate feedback on the app itself: onboarding, UX friction, anything confusing, bugs. Happy to answer anything about the build too.

Play Store: https://play.google.com/store/apps/details?id=com.willisshillis.cassi

Sharing an app I've been building for the past couple of months.

Cassi is a diary/tracking app for parents, built mainly around breastfeeding. It logs feeds (left/right timers), sleep, nappies, mood, growth, and general events — with an optional AI feature that looks for patterns in the logs between what the parent eats and how the baby reacts. It's expanded to cover formula and general baby/child diet tracking too.

The core problem it's solving: it's genuinely difficult to recognise which specific foods in a parent's diet might be upsetting their baby via breastmilk. The link between something you ate and a symptom days later is easy to miss. Cassi exists to make that specific link visible.

It's free to use as a manual diary (with a free PDF export to bring to a GP or paediatrician), and there's a premium tier for the AI insights and photo logging. Currently in open testing on Android.

I'd appreciate feedback on the app itself: onboarding, UX friction, anything confusing, bugs.

Play Store: https://play.google.com/store/apps/details?id=com.willisshillis.cassi&hl=en\_NZ](https://play.google.com/store/apps/details?id=com.willisshillis.cassi&hl=en_NZ)

Hey all — hope it's okay to share this here, happy to take it down if not.

I've been building a baby diary app called Cassi (solo dev, dad here, built it because I couldn't find one that did what I wanted). It's in open testing on Android right now and I'd genuinely love feedback from people who actually breastfeed, because that's the part I most want to get right.

I built the app specifically for breastfeeding parents — to help spot anything they're eating that might be upsetting their baby via breastmilk — and it's since grown to track everything a baby or child eats, so you can spot what's upsetting them there too.

What it does:

• Feed logging with left/right breastfeeding timers (or log manually if you're pumping/combo/formula feeding)
• Sleep, nappy, and mood tracking, all in one diary
• Growth tracking (weight/height over time)
• Optional AI-generated insights that look for possible patterns between your own diet and your baby's feeds/sleep/nappies — this is very much a "might be worth mentioning to your GP or LC" kind of feature, not medical advice, and it says so clearly in the app
• You can invite a partner or another caregiver to log alongside you, so you're not the only one keeping track
• A PDF export you can bring to your healthcare provider

It's free to use as a manual diary, no strings attached. There's a premium tier for the AI insights and photo logging if you want it, but the core diary works fully free.

It's still beta — there will be bugs, some screens are rougher than others, and I'm actively fixing things as people find them. If you try it and something's broken, annoying, or just missing, please tell me. That's exactly the kind of feedback I need right now, good or bad.

Link to try it: https://play.google.com/store/apps/details?id=com.willisshillis.cassi&hl=en_NZ

Thanks for reading — happy to answer any questions in the comments.