Honest tools for
the life you share with your pet.
Calculators and decision tools I built for my own dog Bella. No upsell, no questionable advice, no AI hype — just things that work.
Built by Jim Liu in Sydney — solo indie dev, 18 months of pet-owner trial & error.
Hand-written guides — tested on real pets, not auto-generated
Pet insurance — actually worth it? Real numbers, real math
Three years of premiums vs. one ACL surgery. Spreadsheet linked.
Read guide →Sisal vs cardboard vs carpet — 12 months testing scratching posts
448 observations on one cat. Materials ranked by what she actually used.
Read guide →Kitten week-by-week — weight targets and red flags
Foster diary across 14 kittens. When to call the vet, when not to panic.
Read guide →How old is your dog, really?
The ×7 myth has no scientific source. Use the actual UCSD 2019 epigenetic formula + AKC size-adjusted bands. Type below.
Primary formula: UCSD 2019 (Wang et al., Cell Systems): human_age = 16 × ln(dog_age) + 31, calibrated on Labradors. AKC adjusted formula uses breed-size bands. Neither is a substitute for veterinary advice on health timing.
Everything I wish existed when I got my first dog.
Dog Food Calculator
Calories per day by breed, weight, age and activity level. No guessing.
Dog Age — Not the ×7 Myth
UCSD 2019 epigenetic formula + AKC size-adjusted bands.
Cat Age in Human Years
Actual biological age, not the outdated "×7" myth.
Cat Vomit Triage
Color + frequency + symptoms → vet today vs watch & wait.
Dog Night-Barking Diagnoser
Walk 4 questions, narrow 8 causes — anxiety, pain, exercise, fear.
Kitten Week by Week
Weight targets, milestones, feeding, vaccines — week 1 to 20.
Cat Litter Cost Calculator
Clumping vs crystal vs wood pellets — TCO across cat count.
Pet Insurance Compare
Side-by-side real quotes. I tell you which one I actually use.
Latest things I've actually tested.
Pet insurance — actually worth it? Real numbers, real math
Three years of premiums vs. one ACL surgery. Spreadsheet linked.
Read →Sisal vs cardboard vs carpet — 12 months testing scratching posts
448 observations on one cat. Materials ranked by what she actually used.
Read →Kitten week-by-week — weight targets and red flags
Foster diary across 14 kittens. When to call the vet, when not to panic.
Read →Dog barking at night — 8 causes, decision tree
Walk through the most likely cause in 90 seconds. No more 3am guessing.
Read →Litter showdown — clumping vs crystal vs wood pellets
Eight months bin-weighing four cats. Cost, smell, paw tracking compared.
Read →Cat age in human years — the real biological curve
Why the ×7 myth is wrong, and what AAFP/AAHA 2021 actually says.
Read →Bella, Mochi, and a foster kitten cohort.
Every calculator, every decision tree, every threshold has been pressure-tested on actual pets in a Sydney apartment. Photos below link to the article that came out of each round.
Mochi · hairball frequency, 8-month log
Read →
Foster cohort · 14 kittens, 3 litters
Read →
Sydney vet cost matrix · 18-month tracker
Read →
Bella · night-barking 8-cause decoder
Read →
Bella at 9 · biological age curve
Read →
Kitchen-scale method · 6-week feed log
Read →Stock photos used for cluster illustration; original test photos appear inside each linked article. Photos via Pexels (royalty-free).
I'm Jim. Solo indie dev in Sydney. I built this for my own dog Bella, then figured other pet owners might want it too. No team, no roadmap, no acqui-hire plans. If something's broken, email me.