TendTail

Digital Brain Ltd

About this app

If your cat has just been diagnosed with chronic kidney disease, you probably left the vet with a stack of instructions and a knot in your stomach. TendTail keeps it all in one calm, simple place, so you can spot changes early and walk into every check-up ready.

Cat kidney disease (CKD, or feline chronic renal failure) is something you manage day by day: the renal diet, the water, the sub-q fluids, the weight, the appetite. Holding all of that in your head is exhausting. This app does the remembering for you.

WHAT YOU CAN TRACK
• Subcutaneous (sub-q) fluids: amount and time, so you never double up or miss a session
• Food and renal diet: what they ate, how much, and whether appetite is slipping
• Water intake and hydration
• Weight over time, the number that quietly tells the real story
• Medications and supplements, with reminders
• Symptoms: vomiting, nausea, lethargy, litter-box changes
• Vet visits and lab results: creatinine, BUN, SDMA, phosphorus

SEE THE TREND, NOT JUST TODAY
One off day is noise. A two-week slide in weight or appetite is a signal. TendTail turns your daily notes into simple charts so you can see which way things are heading, and bring real numbers to your vet instead of "I think she's eating a bit less."

BE READY FOR THE VET
Pull up a clean history of weight, appetite, fluids and lab values in seconds. No scrolling through a notes app, no trying to recall last month from memory.

GENTLE REMINDERS, NO GUILT
Set reminders for fluids and meds. Miss one? No broken streaks, no nagging. You just pick up where you left off. Caring for a sick cat is hard enough.

YOUR DATA STAYS YOURS
Everything lives on your phone. No account required, no cloud upload. Your cat's records are private.

FREE TO USE
Track everything that matters, free. Unlock a one-time upgrade (no subscription) to export a full PDF history for your vet. Optional voice and quick-text capture make logging even faster.

Made for owners of cats living with:
• Chronic kidney disease (CKD)
• Feline chronic renal failure or renal insufficiency
• Early kidney decline flagged by a rising SDMA

TendTail won't change the diagnosis, but it helps you give your cat the steady, attentive care that makes the most of your time together.

What’s new

First release. TendTail is here.

Track your cat's weight, water, appetite, food, sub-Q fluids and meds in
about twenty seconds a day. See the trend over weeks, get a quiet nudge
when something drifts, and turn it all into a one-page report for your vet.

Built by a cat owner, for anyone caring for a cat with kidney disease.
We'd love your feedback — it shapes what comes next.