Happy Birthday Email by UW vs Klaviyo: Email Marketing & SMS
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 7, 2026.
The short answer
- Klaviyo is detected on 2580× as many Shopify stores as Happy Birthday Email by UW: 265,727 vs 103 as of Nov 7, 2026.
- On the Shopify App Store: Happy Birthday Email by UW 5.0 from 145 reviews and Klaviyo 4.7 from 3,431 reviews.
- Paid plans start at $10/month for Happy Birthday Email by UW and $15/month for Klaviyo.
- Klaviyo lists 68 features Happy Birthday Email by UW’s listing doesn’t mention, including A/B testing, Abandoned cart, AI generation.
- 48 stores run Happy Birthday Email by UW and Klaviyo together.
Head to head
Build customer loyalty with an automated Birthday Club
Email, SMS, and more - a unified customer platform
- United States
- United Kingdom
- Canada
- United States
- United Kingdom
- Australia
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Base
- · Add birthdays to customer metafields
- · Break down customers by age group
- · Capture birthdays online and in-store
- · Send birthday emails and follow-ups
- · Store up to 1k Birthday Club members
- · Track revenue from birthday emails
Growth
- · Add birthdays to customer metafields
- · Break down customers by age group
- · Capture birthdays online and in-store
- · Send birthday emails and follow-ups
- · Store up to 5k Birthday Club members
- · Track revenue from birthday emails
Unlimited
- · Add birthdays to customer metafields
- · Break down customers by age group
- · Capture birthdays online and in-store
- · Connects to Klaviyo and other ESPs
- · Send birthday emails and follow-ups
- · Store unlimited Birthday Club members
Free
- · AI-assisted, on-brand content
- · Built-in dashboard & reporting
- · Guided onboarding setup
- · One place for forms, emails, and flows
- · Seamless migration to full platform
- · Set up directly in Shopify Admin
SMS
- · Automated two-way conversations
- · Branded SMS links
- · Customizable multi-channel attribution
- · Multi-channel A/B testing
- · Multi-channel segmentation and flows
- · SMS AI for campaign creation
- · 160+ campaign templates
- · Email AI for campaign creation
- · Multi-channel A/B testing
- · Multi-channel segmentation and flows
- · Personalized product recommendations
- · Predictive analytics
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureHappy Birthday Email lets you celebrate every customer’s birthday with a personalised email and birthday discount. Collect birth dates online or in-store, then send automated birthday emails that drive sales and boost loyalty. Use it as a simple birthday loyalty program or connect it with your email platform. You’ll build stronger relationships and gain insight into customer age and anniversaries too.
Go beyond the basics with the Klaviyo marketing app. New stores get a guided setup — sign-up form, welcome email, and abandoned-checkout flow — without leaving Shopify Admin. Unify data from 350+ integrations and boost marketing performance with campaigns, smart segmentation, and automated workflows from Klaviyo’s AI Agents.
- An end-to-end birthday marketing campaign with minimum ongoing effort
- A subtle, cost-effective loyalty program for Shopify merchants of any size
- Powering relational eCommerce through birthday collection
- Foster a continuous cycle of engagement and insight by sending birthday emails
- Use data from Shopify and other apps – web activity, tags, catalog, coupon codes
- Create segments and triggers using complete historical and real-time data
- Use omnichannel templates for Welcome, Back in Stock, Abandon, Price Drop & more
- Get real-time revenue data per automation, campaign, segment, and channel
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Happy Birthday Email by UW |  Klaviyo |
|---|---|---|
| Detected stores | 103 | 265,727(ahead) |
| Net store change, 28 days | 0 | +454 |
| Stores added, 28 days | Not enough data | 2,852 |
| Big-brand share | Not enough data | 15% |
| Top store categories | Apparel & Accessories, Health & Beauty, Food, Beverages & Tobacco | Apparel & Accessories, Health & Beauty, Home & Garden |
| Top store countries | United States, United Kingdom, Canada | United States, United Kingdom, Australia |
Reviews
| Measure | Happy Birthday Email by UW | Klaviyo |
|---|---|---|
| App Store rating | 5.0 ★(ahead) | 4.7 ★ |
| App Store reviews | 145 | 3,431(ahead) |
| New reviews, 28 days | 0 | 66(ahead) |
| Reviewers a year or more in | Not enough data | 42% |
Pricing
| Measure | Happy Birthday Email by UW | Klaviyo |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | $10/month(ahead) | $15/month |
| Longest free trial | 28 days | Not listed |
| Plans listed | 3 | 3 |
Listing
| Measure | Happy Birthday Email by UW | Klaviyo |
|---|---|---|
| Shopify category rank | #14 | #2 |
| Shopify App Charts | #7 in Giveaways and contests | #2 on the Shoplist 100 |
| Built for Shopify | No | No |
| Launched | Jun 23, 2017 | Sep 20, 2012 |
| Languages | 1 | 6 |
| Developer | Union Works Apps | Klaviyo |
FAQ
Happy Birthday Email by UW and Klaviyo: common questions
- Which is more popular, Happy Birthday Email by UW or Klaviyo?
- Klaviyo is detected on 2580× as many Shopify stores as Happy Birthday Email by UW: 265,727 vs 103 as of Nov 7, 2026.
- Is Happy Birthday Email by UW or Klaviyo cheaper?
- Paid plans start at $10/month for Happy Birthday Email by UW and $15/month for Klaviyo. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, Happy Birthday Email by UW or Klaviyo?
- On the Shopify App Store: Happy Birthday Email by UW 5.0 from 145 reviews and Klaviyo 4.7 from 3,431 reviews.
- What features does each app list that the other doesn’t?
- Happy Birthday Email by UW lists 22 the others don’t mention, such as Analytics, Analytics dashboard, Anniversary, Birthday. Klaviyo lists 68 the others don’t mention, such as A/B testing, Abandoned cart, AI generation, Analytics. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Can you use Happy Birthday Email by UW and Klaviyo together?
- Yes. 48 stores run Happy Birthday Email by UW and Klaviyo together. Shoplist detects both apps on those storefronts.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 7, 2026; estimated figures are labeled.
Keep comparing
More matchups
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 7, 2026. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.