Well, as Charlie Chan once said 'Someone always about to put fly in ointment'.
As so it went today with Rappi. Had ordered and received first time in late March without incident, everything went off without a hitch. There were a few days between order placement and delivery. 2nd order placed a week ago, with delivery date today, Saturday. The issue is, you make selections from one of their featured supermarkets on Rappi's website. Rappi gives a summary of the order, a delivery date, charges your CC for the amount of purchase. The impression is that Rappi has locked down your selections/order with the supermarket. They did not, and Rappi guy/personal shopper went shopping for the products today, this one at Disco, started an hour before the scheduled delivery time. Long story short there were substitutions, out of stocks, quantity changes required, a change to the final total purchase amount. Your card is charged/credited + or - depending the final total.
The long story is, the shopping and adjustments occur with your personal shopper online and live through the Rappi app in your phone. The personal shopper consults with you about the changes live, through dialogue boxes (in Spanish), in one instance I had ordered a wine glass, the one ordered not available, the shopper sent me a picture for approval of an alternative wine glass. To their credit they do their best to adjust things. Finally, it was summed up and delivered within 1/2 hour.
So, as far as digital shopping goes, although Rappi has a superior interface (website, speed, easy ordering online, brilliant live interface through app with your personal shopper, they are flawed right now with the disparity between what you order on one day and what they can actually deliver on another date, up to a week!
If Coto and Disco can get their websites working, still an IF, they may be the better play. Presumably you're ordering, they keep their stock availability up to date, they pick the order after you place it and you receive what you ordered and paid for. Vamos a ver!!
So just as an aside, so p*ssed off at the Rappi shortfalls, grabbed a big shopping bag, armed myself with alcohol spray and tissues and walked 2 blocks to one of the neighborhood Chino markets - which had everything I needed/wanted at better prices, the cashier wore latex gloves, a few nitwit Argies buzzing around in the aisles ignoring distancing, and I checked out with heavy bag and schlepped home dogging the also argie nitwits waltzing down the street here and there. Operation Saturday shopping in the time of coronavirus Out.