Optionfier vs Easify for add-ons that track real stock
If you're shopping for a product options app, Easify is almost certainly on your list. It's the most popular one in the category (4.9 stars from over 3,000 reviews and a Built for Shopify badge, as of September 2026), and it's a good app. So why would you pick Optionfier instead?
The honest answer comes down to add-ons: how they're charged, where they land at checkout, and what keeps their stock straight. Here's how the two compare, using Easify's own docs for their side.
Both apps can track stock for a paid add-on
Easify gives you two ways to charge for an add-on. An add-on price is a fee attached to the option: tick "Add price", type an amount, done. There's no product behind it, so there's no stock count either. An add-on product is a real Shopify product linked to the option. In Easify's words: "When the main product is purchased with a selected option linked to a product, the inventory of that linked product is also deducted." Their listing also has a "hide out-of-stock options" feature.
Optionfier does the same job. Link a choice to a real product and selling the choice sells the product. When it runs out, the choice goes sold out on the product page on its own.
So if all you need is "gift wrap +$5 and don't let me sell more wrap than I have", both apps get you there. The differences are in what happens around it.
Where the add-on lands at checkout
Easify can nest add-ons under the main product in the cart. Checkout is different, and their docs are upfront about it: "Due to Shopify's restrictions, the app can't merge Add-ons with the Main product on the checkout page. Add-ons and main products will always be listed separately during checkout, regardless of your settings."
Optionfier sells priced add-ons as a native Shopify bundle, the same format Shopify uses for its own bundled products. At checkout the customer sees the product with its add-ons indented beneath it, as one purchase. Behind that, each add-on is still its own real line item with its own variant, so fulfillment, refunds and restocks work exactly like any other Shopify product. (Your theme has to support Shopify's bundle format for the indenting to show in the cart.)
Does that matter? If your add-ons are small extras, maybe not. If you sell a coffee maker with a grinder and a filter pack bolted on, a checkout that reads as one thing feels a lot more like buying one thing.
Stock behind options that don't cost extra
This is the one people don't expect. Plenty of choices don't change the price but still use up something you keep: a walnut finish, a limited-run label, an engraving blank. In Easify, the route to stock is an add-on product, and that product is a separate line at checkout.
In Optionfier you can set the option to Text on order and still link each choice to a product. The customer's pick shows up as plain text on the order, the price doesn't move, and there's no extra line. Optionfier deducts the linked stock when you fulfill, greys the choice out when it's gone, and puts the stock back if you refund with restock checked. It's the only way I know of to have a text-only option with honest stock behind it.
What's on the free plan
Easify's free plan (September 2026) has 15 option types, unlimited option sets and conditional logic between Easify's own options. Pro at $9.99 a month takes you to 28 types and adds price formulas, multi-file upload, conditional logic based on Shopify variants, and date rules like blocked dates and lead time. Their live preview, where the customer's text appears on the product image as they type, is on Premium at $19.99.
Optionfier's free plan has every feature: all 23 option types (swatches and dates included), file uploads, conditional logic, build-a-box, native bundles and POS. The one limit is sales. Up to $1,000 a month can go through bundles, boxes and priced add-ons, and text options never count. Pro at $9.99 a month removes the limit, and it's the only paid plan.
To be straight about it: if you sell a lot of paid add-ons, you'll hit that limit and pay $9.99. If your options are mostly swatches and text, you'll probably never pay at all.
Which one I'd pick
Pick Easify if you want that live preview (someone types "Happy Birthday, Sam" and watches it show up on the mug photo as they type), or price formulas. Those are real strengths, and Optionfier doesn't do either.
Pick Optionfier if your add-ons are physical things you stock, if you want checkout to show them as one bundle, or if you need stock behind options that don't cost extra. Also if you'd rather have build-a-box and bundles in the same app as your options, instead of adding another app.