To find companies with zero debt, you can use the screener on the Yahoo Finance website here.
Click the Equity Filters button and then navigate to Financials - Balance Sheet > Total Debt > Custom > Equal > 0. Then, check the Shariah compliance of the stocks you’re interested in using Zoya.
You can also use the filters in Zoya to find companies with zero non-compliant revenue. On the Explore screen, click the filter button and then Non-compliant Revenue > None.