Invoicing is one part of a shop's problem
For a service business, the invoice is close to the entire transaction — you do the work, you bill for it, you get paid. For a shop, the invoice is one of five things happening at once: stock moves off the shelf, credit goes onto a party's account, material may leave on a truck, cash goes into a drawer, and GST accrues. A product built around invoicing handles the first well and leaves the rest to you.
Stock is where the difference shows
A shop that bills without moving stock has an item list, not an inventory. Within a month the figures mean nothing and ordering goes back to walking into the godown. In MaterialBill every billed line reduces stock and every purchase raises it, in the item's own unit, with conversions handled — which is the only arrangement under which stock stays true in a shop with thousands of lines and nobody free to count them.
Credit in a trade where credit is the business
Half a material shop's turnover goes out on udhaar and comes back after the site is paid. What that needs is not just a record of who owes what, but ageing, credit limits that warn before material leaves, payments allocated to specific bills, and a statement the customer can check. Those are the things that decide whether the money comes back, and they are a different product from invoicing.
Where Refrens would suit you better
If you are a contractor, consultant, agency or freelancer — billing for work rather than for goods, with no stock and no deliveries — an invoicing platform is a better fit than shop software, and it will be quicker to set up. Being straight about that is more useful to you than a feature table.