Depends on age. I like ABC mouse https://www.abcmouse.com/html5/appdload and I have heard good things about Acellus https://www.acellusacademy.com/
Discussion
I looked into Accelus. nostr:nprofile1qqs2rlzal4lleatrezg4tdrxw5d4srg3tcfkutuvjr5fzvu9h0kmrncpzemhxue69uhhyetvv9ujuvrcvd5xzapwvdhk6qgdwaehxw309aukzcn49ekk2qghwaehxw309aex2mrp0yh8x6tpd4ehgu3wvdhk68uj6gq used it with his grandson, not sure if he still does. Accelus didn't look like a good match for us after doing some research on the founder.
I have kids of all ages, from baby to teenagers