The same Quillix you use in the browser, in its own window on your computer, with the one thing a web page cannot do: talk to the TallyPrime running beside it. Vouchers go straight into Tally, and the chart of accounts comes straight out.
Included with the Basic plan · Windows 10 and 11

TallyPrime only answers programs on its own computer, and a web page cannot reach it in any browser. The Windows app can. Everything else is the same Quillix, the same login and the same data.
The Windows app comes with the Basic plan, alongside everything else in it.
Tally only talks to programs on its own computer, so install Quillix on that machine and sign in as usual.
In TallyPrime: F1 › Settings › Connectivity › Client/Server configuration, set to Server on port 9000. Quillix finds it on its own.
Included with the Basic plan. Download takes you to checkout.