Shopify conversion apps: what each one actually meters

One of these bills you on the revenue it generates. That is the fairest model here, and the one to model most carefully.

Conversion apps are sold on upside, which makes them unusually easy to install and unusually hard to evaluate. The install is a click; the cost arrives later and in a shape you may not have looked at. The four here meter in four different ways, and only one of them ties its fee to the money it actually makes you.

The second thing worth saying out loud: an urgency widget makes a claim to your shopper. If the stock is not low or the sale does not end, that claim is not a growth tactic, it is a false statement on a product page — and regulators treat it as one.

How we picked

• We read the app’s own listing and date it, and where the price moved between two readings we say so.
• We name the meter, because ‘from $X a month’ hides more here than in most categories.
• We flag where an app makes a claim to your customer, since that carries a risk no pricing page mentions.

The picks

1F

Fast Bundle

Best for: Shopify merchants who want every bundle and upsell format from one app — mix-and-match, build-your-own, BOGO, volume bre

The meter is not your catalogue, your traffic or your seats but the revenue the bundles themselves produce. That is the most defensible model on this page — you pay in proportion to what it earns you — and it means the bill is genuinely unpredictable until the feature works. Best if you want every bundle format from one app rather than stacking three.

Skip it if you need one bundle type only, where a single-purpose app costs less than the metered ladder; you sell in person, since Shopify POS support sits behind the $299 Enterprise tier; or an app in your path to checkout having been pulled and deactivated once, however well handled, is a risk you cannot carry

Visit Fast Bundle →Read our full Fast Bundle review →

2S

Scarcity.AI

Best for: Shopify merchants who genuinely run low stock or timed promotions and want to surface that on the product page — the low

Not one product but three from the same developer, installed and billed on their own. Worth knowing before you budget for ‘the app’. Only sensible if your stock genuinely runs low and your promotions genuinely end; a countdown that resets is the kind of claim the FTC treats as deceptive.

Skip it if your stock is not low and your sale does not end, because a claim a shopper would read as false is one the FTC treats as deceptive; or your brand sells on trust, where a blinking counter costs more in credibility than it returns

Visit Scarcity.AI →Read our full Scarcity.AI review →

3S

Storista

Best for: Shopify stores that already produce TikTok or Reels content and want it on the storefront as shoppable video, with the f

Turns short-form video you already have into shoppable widgets. The important word is ‘already’: the app displays content, it does not create any, so without a TikTok or Reels pipeline feeding it you are paying for an empty carousel.

Skip it if you have no UGC or short-form pipeline to feed it — the widget displays content, it does not create any — or you want automatic product-to-video tagging without paying $49 a month for it

Visit Storista →Read our full Storista review →

4T

TnC

Best for: Shopify merchants on a standard plan who need a recorded “I agree” gate before payment — for GDPR, an age gate, digital-

A recorded ‘I agree’ gate before payment, which is a compliance need rather than a growth one. Notable for a different reason: the ladder we read on 24 August 2026 was higher again on 25 August. Check the live price yourself; ours is dated for exactly that reason.

Skip it if you are on Shopify Plus and want the checkbox inside the real checkout page, where the plan you need is the $19.99 Plus tier the App Store listing does not show; you expected a free tier from the listing's badge, which covers development and partner stores only; or a checkbox on the cart and the express buttons is not the enforcement your legal requirement actually asks for

Visit TnC →Read our full TnC review →

Compared at a glance

Revenue-share is the honest model, and the one to model

Being billed on the revenue a feature produces is the fairest arrangement on this page: no upside, no fee. It is also the one that makes a spreadsheet hard, because the number only exists after the thing works. Take your current attach rate, apply a modest lift, and look at what the fee becomes at that level before you decide it is cheap.

For every other app here, the discipline is simpler and rarely done: measure the conversion difference for a few weeks with the app off. Conversion tooling is the category where belief substitutes for measurement most often, and the apps themselves have no incentive to correct that.

Frequently asked questions

Do urgency widgets actually work?

They can lift conversion when the scarcity is real, because they surface information the shopper wants. When it is manufactured, you are trading a short-term lift for a claim you cannot defend.

Is a revenue-share app more expensive than a flat one?

At low volume, no — you pay almost nothing. At high volume it usually costs more than a flat tier would, which is the trade you accept for paying nothing while it is unproven.

How many conversion apps should a store run?

Fewer than most stores do. Each one adds script weight to the page it is meant to improve, and past a handful the speed cost starts eating the conversion gain.

Free tools for this decision

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Some links on this page are affiliate links: if you sign up we may earn a commission, at no cost to you, and it never changes what we write. Every figure above was read on the vendor’s own page on the date shown.