TravelSystemFit answers one question for parents building a travel system: does this infant car seat fit this stroller, and if it does, which adapter joins them. Manufacturers document their own brands well and each other's barely at all, so a cross-brand pair like a Chicco seat on an UPPAbaby stroller has no single home. This site is that home.
How the Answers Are Built
Every verdict is read from the manufacturer's own compatibility chart, spec sheet or adapter product page. Each one is stored with its source, its region and the date it was checked, and those three things are printed on the page next to the verdict. A pair with no source is labelled Not Listed, which is a statement about the documents, not a guess about the products.
What This Site Will Never Do
It will never guess a fit, never present a retailer listing as compatibility evidence, and never let a commission change a verdict. Brands cannot pay for placement in a matrix. When the answer is no, the page says no and shows the closest pairs that do fit.
Unofficial, on Purpose
TravelSystemFit is independent and unofficial. It is not affiliated with, endorsed by, or sponsored by any stroller or car seat brand. Brand names are used only to identify the products their owners make.
Where It Grows Next
The same matrix extends to double configurations and stroller wagons, then to other baby-gear fit questions, always under the same rule: no manufacturer source, no verdict.