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
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. One thing to know before it sits in your checkout path: in July 2026 Shopify pulled the app for about two weeks after a security incident (fully searchable again on 3 August; the vendor reports no data was accessed), and copycat apps borrowed the name meanwhile, so install from the fast-bundle-product-bundles listing.
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 →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 →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 →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
| Tool | What it meters | Pricing, as we read it |
|---|---|---|
| Fast Bundle | the revenue your bundles generate | Standard (1K) is $19 a month or $180 a year and covers up to $1,000 of monthly bundle sales. read 2026-08-24 |
| Scarcity.AI | three apps, each billed separately | The Low Stock Counter is $4.99 a month or $41.91 a year at a stated 30% saving, with a 7-day trial; its free tier is Development Stores, meaning development and partner stores only rather than a working free plan. read 2026-08-22 |
| Storista | four tiers | Basic is $15 a month for 50 videos, unlimited views, basic analytics and videos on any page. read 2026-08-23 |
| TnC | flat tiers, and they moved | The monthly ladder is $6.99, $10.99 and $12.99, and the annual prices are $67.10, $92.32 and $109.12. read 2026-09-29 |
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
Other buying guides on this site
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- Amazon seller tools: four products, four completely different meters
- SEO tools: four jobs that are usually confused for one
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.