In my opinion, each app has its pros and cons, it's important to know what features you're looking for (just a simple recommended products base on the same category or visitor history, bundle discount?), your budget, business size. If you can provide more info then I think I could suggest one since I have done testing lots of upselling, cross sell app for integration with our app PageFly.
You can take a look at this Upsell, Crosssell apps review for more info
as pagefly already mentioned, all apps have their pros & cons. You can check apps descriptions to see, if & how they fit your needs, as every store has different needs. And check apps reviews to see what other store owners say about each app.
Also, you could try out our newly-added app for cross-selling, to see if it fits your needs https://apps.shopify.com/recommendations-cross-sell. Recommended products, shown in the product page, are generated automatically with Artificial Intelligence & Machine Learning technologies. You may also set manual recommendations, as well as exclude products from being recommended to your customers. You can use any language you want, set the number of recommended products shown and choose your call-to-action button: ‘add to cart’ or ‘view product’.
Here is a demo: Demo Store
We just recently published an app Smart Customer Targeting, which recommends products for cross-selling. Basically, it looks at your sales history and analyzes the purchases of repeating customers to determine which products are being bought by repeating customers, based on what their initial purchase was. The idea was to improve the LTV of your existing customers.
If this sounds interesting for you, the app can be found here: https://apps.shopify.com/sct.
It has a 7-day free trial, so please feel free to try it out and delete it if you don't find it valuable. If you would like to speak more, please reach out at firstname.lastname@example.org.
Thanks and best of luck,
You can check it here:- Upsell & Cross-sell to Drive Sale
I would like to recommend the iCart Cart Drawer Cart Upsell app as it is the best Shopify app for cart customization and conversion optimization. iCart is developed in a way that anyone from a non-technical background can use this app. With iCart, you can design your side cart easily with its intuitive drag and drop interface and can increase sales by showing upsells and cross-sells in it. The best thing you can love about this app is that like other apps iCart is not just limited to a single feature, it has multiple features. So when you install this app you can access multiple features within a single app instead of wasting money on multiple apps.
Key features of this app:
And top of that it provides a free trial of 30 days and you can use it free forever if you have less than $100 USD revenue/month generated through the app.
For more information, you can have a look at here: https://apps.shopify.com/icart
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There are a ton of options available in the Shopify app store. I've compiled a list of a handful of my favourites. They all offer unique features and come at different price points. I recommend utilizing their free trials to see which one is the best fit for your needs.
I hope this helps! If there is anything else I can help you with, please let me know.