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CartHappy
Splits your grocery cart across stores, automatically
Most grocery apps show you deals inside one store. CartHappy compares 350M prices a day across 10,000 stores, auto-applies every coupon, and splits your cart to whatever's cheapest that week. It can also learn your regular list and build your cart automatically — WXYZ Detroit tested it live on TV, saving a family $28 instantly. We built ours as an extension because it works horizontally, sitting inside each retailer's environment while helping the shopper shop across stores, not locked into one.
I built CartHappy for my mom. She's in metro Detroit, and every week she's doing the same thing — checking flyers, clipping coupons, trying to find which store has eggs cheaper this week. I watched her do this for years and never saw a real fix that didn't ask her to change how she shops.
So we built CartHappy to do that work for her and others (nationwide now), automatically. Connect your store accounts, and it checks 350 million prices a day across 10,000 stores in the US, applies every coupon it finds, and splits your cart to whatever's cheapest that week. It can also learn your regular list from what you buy and build a cart on its own.
The harder problem was everyone building their own version of this locked inside one retailer, but nobody shops in just one store — my mom doesn't, and neither does anyone else. Doing this across retailers meant matching the same product across completely different catalogs, pricing systems, and coupon structures in real time — no shared source of truth to pull from. So the approach had to change: build it as an extension that works horizontally, sitting inside each retailer's site instead of replacing it.
WXYZ Detroit tested it live on TV a few weeks ago — a family synced their purchase history and CartHappy found them $28 in savings, instantly. That's the same thing my mom sees now every week.
It's live across Walmart, Target, Kroger (and its family of companies), and Safeway — we're working on adding more. Would love feedback from this community, especially on what would make it more useful week to week.
Installed it this morning and the auto-split cart found cheaper stuff for half my list at different stores without me even searching. The coupon auto-apply is the part that genuinely surprised me, saved me about $19 on my usual run.
Can you tell me what retailers you plan to add next? And, are you able to provide any of the back end data directly to brands or retailers?
I dig how it doesn't just show you the prices elsewhere, but creates the basket for you w/ item already added
One thing I'd love to see is a shared family list mode, where my partner and I can both add items in real time and CartHappy splits the cart between stores based on whoever is shopping that day. That would make the auto-cart feature way more useful for households that don't always shop together.
Tried it on my usual Walmart run and it actually flagged a cheaper version of my coffee at Kroger, plus stacked a coupon I never would have found. The browser extension feels invisible in a good way.
honestly this looks super useful, the cross-store cart split is clever. one thing i'd love though is a price drop alert for items on my regular list, like if the chicken i buy every week goes on sale at aldi, just ping me so i can wait or stock up
honestly love the cart splitting idea, super smart. one thing i'd want though is some kind of delivery coordination, like if the cheapest cart ends up split across three different stores, it would be nice if the extension could either schedule pickups or show me a single delivery option that consolidates everything so i'm not driving all over town on a tuesday evening
About CartHappy on Product Hunt
“Splits your grocery cart across stores, automatically”
CartHappy was submitted on Product Hunt and earned 24 upvotes and 22 comments, placing #20 on the daily leaderboard. Most grocery apps show you deals inside one store. CartHappy compares 350M prices a day across 10,000 stores, auto-applies every coupon, and splits your cart to whatever's cheapest that week. It can also learn your regular list and build your cart automatically — WXYZ Detroit tested it live on TV, saving a family $28 instantly. We built ours as an extension because it works horizontally, sitting inside each retailer's environment while helping the shopper shop across stores, not locked into one.
CartHappy was featured in Artificial Intelligence (473.8k followers), E-Commerce (41.7k followers) and Shopping (1.5k followers) on Product Hunt. Together, these topics include over 127.2k products, making this a competitive space to launch in.
Who hunted CartHappy ?
CartHappy was hunted by John Laramie. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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John Laramie
Hey PH 👋
I built CartHappy for my mom. She's in metro Detroit, and every week she's doing the same thing — checking flyers, clipping coupons, trying to find which store has eggs cheaper this week. I watched her do this for years and never saw a real fix that didn't ask her to change how she shops.
So we built CartHappy to do that work for her and others (nationwide now), automatically. Connect your store accounts, and it checks 350 million prices a day across 10,000 stores in the US, applies every coupon it finds, and splits your cart to whatever's cheapest that week. It can also learn your regular list from what you buy and build a cart on its own.
The harder problem was everyone building their own version of this locked inside one retailer, but nobody shops in just one store — my mom doesn't, and neither does anyone else. Doing this across retailers meant matching the same product across completely different catalogs, pricing systems, and coupon structures in real time — no shared source of truth to pull from. So the approach had to change: build it as an extension that works horizontally, sitting inside each retailer's site instead of replacing it.
WXYZ Detroit tested it live on TV a few weeks ago — a family synced their purchase history and CartHappy found them $28 in savings, instantly. That's the same thing my mom sees now every week.
It's live across Walmart, Target, Kroger (and its family of companies), and Safeway — we're working on adding more. Would love feedback from this community, especially on what would make it more useful week to week.
Thank you!
John