Smile.io at a glance
- 21,919 Shopify stores ran Smile.io in September 2026: 3.1% of all Shopify stores in the crawl.
- #1 in loyalty, referrals and affiliates, ahead of GoAffPro (20,289).
- 42 of its stores are in the top 100,000 sites by Chrome traffic, 2.2% of Shopify stores that size.
- 87% of its stores pass all three Core Web Vitals for real visitors (12,666 measured), against 85% for comparable stores and 83% for all Shopify stores.
- Stores running it show 4 apps on the home page (median), against 2 for all Shopify stores, and load 2.8 MB of JavaScript.
- 67% of its stores are in the United States, where it runs on 4.0% of Shopify stores.
Real-user speed of stores running Smile.io
From the Chrome UX Report, phone visitors, 75th percentile per store. A store passes when LCP is at most 2.5 s, INP at most 200 ms and CLS at most 0.1. "Comparable stores" is what Shopify stores of the same traffic rank in the same country pass on average, weighted to match this app's stores, because traffic and the visitors' phones and networks move speed more than any single app.
| Stores | Measured | Median LCP (p75) | Median INP (p75) | Good LCP | Good INP | Good CLS | Pass all three |
|---|---|---|---|---|---|---|---|
| Running Smile.io | 12,666 | 1.5 s | 100 ms | 94% | 94% | 96% | 87% |
| Comparable stores | – | – | – | – | – | – | 85% |
| All Shopify stores | 378,581 | 1.5 s | 100 ms | 91% | 91% | 96% | 83% |
Stores running Smile.io pass about as often as comparable stores. See how the number of apps on a page relates to speed in the full report.
Smile.io by store size
Site rank from the Chrome UX Report, which places every site by how many Chrome visitors it gets. The last column is Smile.io's share of all Shopify stores in that band.
| Site rank | Stores running it | Share of its stores | Share of Shopify stores in the band |
|---|---|---|---|
| Top 10,000 sites | 0 | 0.0% | 0.0% |
| Top 100,000 | 42 | 0.2% | 2.3% |
| Top 1 million | 1,912 | 8.7% | 4.1% |
| Beyond the top million | 19,965 | 91.1% | 3.0% |
Where Smile.io stores are
The country each storefront reports. The last column is how many of that country's Shopify stores run Smile.io.
| Country | Stores running it | Share of its stores | Share of the country's Shopify stores |
|---|---|---|---|
| United States | 14,781 | 67.4% | 4.0% |
| United Kingdom | 1,060 | 4.8% | 3.5% |
| Canada | 722 | 3.3% | 4.9% |
| Australia | 682 | 3.1% | 3.1% |
| France | 433 | 2.0% | 2.8% |
| India | 411 | 1.9% | 1.2% |
| Germany | 365 | 1.7% | 1.5% |
| Singapore | 291 | 1.3% | 5.8% |
Apps used together with Smile.io
The other apps most often found on the same home page. "Likelier than average" compares that share with the app's share of all Shopify stores: 2.0× means twice as common next to Smile.io as elsewhere.
| App | Kind | Stores with both | Share of Smile.io stores | Likelier than average |
|---|---|---|---|---|
| Judge.me | Reviews | 8,990 | 41% | 1.7× |
| Klaviyo | Email and SMS | 8,766 | 40% | 1.9× |
| Microsoft Clarity | Heatmaps and tests | 3,284 | 15% | 1.1× |
| Mailchimp | Email and SMS | 3,071 | 14% | 1.7× |
| Klarna | Pay later | 2,397 | 11% | 0.9× |
| PushOwl | Email and SMS | 2,138 | 10% | 1.7× |
| WhatsApp chat buttons | Chat | 1,779 | 8% | 0.7× |
| Omnisend | Email and SMS | 1,529 | 7% | 2.1× |
See the apps, theme and real speed of any store you visit with Store Lens for Chrome, free.
Other loyalty, referrals and affiliates
The most used apps that do the same job. The full report compares every group.
Frequently asked questions
How many Shopify stores use Smile.io?
21,919 stores in the HTTP Archive crawl of September 2026 showed Smile.io on their home page, 3.1% of the 716,063 Shopify stores in the crawl. That makes it #1 in loyalty, referrals and affiliates and #12 of all the apps we count.
Is Smile.io used by large Shopify stores?
42 of its stores rank in the top 100,000 sites by Chrome traffic, 2.2% of all Shopify stores that size, against 3.1% of Shopify stores overall.
Does Smile.io slow down a Shopify store?
For real visitors, 87% of its 12,666 measured stores pass Core Web Vitals, against 85% for comparable stores (the same traffic rank in the same country). The median store running it has a 75th-percentile LCP of 1.5 s and INP of 100 ms. This compares stores, it does not test the app: stores that choose an app differ in other ways too.
Which apps are used together with Smile.io?
On stores running Smile.io, the most common other apps are Judge.me (41% of them), Klaviyo (40% of them), Microsoft Clarity (15% of them), Mailchimp (14% of them).
Where is this data from?
The HTTP Archive loads the home page of every site in the Chrome UX Report once a month and detects apps with the open-source Wappalyzer rules. Speed comes from the Chrome UX Report, phone visitors, 75th percentile. Method, limits and CSVs are on the report page.
Sources and method
Counts from the HTTP Archive crawl of September 2026 (mobile home pages, Wappalyzer detections in technologies); speed from the Chrome UX Report, phone, August 2026. Only what an app puts on the home page can be seen. The method, its limits, the queries and the CSVs are on the report page. Data under CC BY 4.0: credit Mufatech Studio and link to this page. Smile.io is a trademark of its owner; this study is independent and not affiliated with it.