Margadarshini has no accounts. It never asks for your name, phone number or Aadhaar.
What you search for, the answers you give to a guide's questions and the documents you tick are kept only in this browser on this phone. Nothing is sent anywhere.
There are no ads and no cookies, and nobody follows you from page to page or from site to site.
To know which guides are read and how fast the pages open, the site counts page views with Cloudflare Web Analytics, the host's own counter. For each page opened it notes the page's address (without the words you searched for), the browser, the kind of device, the country, the site you came from and how fast the page loaded. It uses no cookies and stores nothing on your phone, and it does not tell one visitor from another.
Apart from that counter, the site loads only its own files, with one exception: when you choose a district on the offices page, it opens that district's public office contacts from data.opentelugu.org, Open Telugu's public data site, and keeps a copy on this phone. It sends nothing about you, and the district you chose stays on this phone. As with any web page, the sites' host sees the phone's internet address while it sends a file; Open Telugu keeps no record of who asked.
Once you have opened Margadarshini, the guides you opened also work without the internet.
"Report a mistake on this page" (at the foot of each page) opens Open Telugu's contact form with the address of the page you were on. Nothing goes until you write your message and send the form yourself.
In settings you can remove your answers, document ticks and preferences. Saved guides have a separate remove option there.