Every bond that exists is not a realistic target, and it is worth being clear why. There are millions of individual bonds outstanding. The 500-odd non-financial companies in the S&P 500 alone have more than 7,000 separate bonds between them, and one large bank can have tens of thousands. Add every government, every agency, and roughly a million US municipal bonds, and no dashboard — free or paid — lists them all one by one. The databases that come closest cost tens of thousands a year, and even they cannot price most individual bonds, because most bonds do not trade on any given day.
What this does instead is cover the market by value rather than by count. The 102 entries here span every major government bond market, every credit rating from AAA down to CCC at every common length, municipals, mortgage and asset-backed debt, and emerging markets in both dollars and local currency. Between them they account for the large majority of the money actually invested in bonds worldwide. Any individual bond you might buy sits inside one of these buckets and behaves like it.
For one specific bond, paste its CUSIP or ISIN into the search box at the top. It points you to the free public registries that genuinely are complete: FINRA carries every US corporate and agency bond trade, and EMMA carries every US municipal bond with prices and disclosures. Both free. That is the honest route to bond-by-bond coverage: this dashboard tells you which part of the market to be in, those registries tell you what a particular bond in it is worth.