---
title: "Happy Birthday Email by UW vs Klaviyo: Email Marketing & SMS: Shopify app comparison"
description: "Compare Happy Birthday Email by UW and Klaviyo: Email Marketing & SMS on detected Shopify stores, App Store reviews, pricing, listed features and integrations."
canonical_url: "https://shoplist.co/shopify-apps/compare/happy-birthday-by-union-works-vs-klaviyo-email-marketing-sms"
markdown_url: "https://shoplist.co/shopify-apps/compare/happy-birthday-by-union-works-vs-klaviyo-email-marketing-sms.md"
data_as_of: "Nov 7, 2026"
---

# Happy Birthday Email by UW vs Klaviyo: Email Marketing & SMS

Shopify app comparison from Shoplist. Store counts as of Nov 7, 2026.

## At a glance

- 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.

## Adoption

| Measure | Happy Birthday Email by UW | Klaviyo | Ahead |
| --- | --- | --- | --- |
| Detected stores | 103 — as of Nov 7, 2026 | 265,727 — as of Nov 7, 2026 | Klaviyo |
| Net store change, 28 days | 0 — estimated | \+454 — estimated |  |
| Stores added, 28 days | Not enough data | 2,852 — new and returning |  |
| Big-brand share | Not enough data | 15% — of stores of known size |  |
| 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 | Ahead |
| --- | --- | --- | --- |
| App Store rating | 5.0 ★ | 4.7 ★ | Happy Birthday Email by UW |
| App Store reviews | 145 | 3,431 | Klaviyo |
| New reviews, 28 days | 0 | 66 | Klaviyo |
| Reviewers a year or more in | Not enough data | 42% |  |

## Pricing

| Measure | Happy Birthday Email by UW | Klaviyo | Ahead |
| --- | --- | --- | --- |
| Free plan | Not listed | Not listed |  |
| Lowest paid monthly plan | $10/month | $15/month | Happy Birthday Email by UW |
| Longest free trial | 28 days | Not listed |  |
| Plans listed | 3 | 3 |  |

## Listing

| Measure | Happy Birthday Email by UW | Klaviyo | Ahead |
| --- | --- | --- | --- |
| Shopify category rank | \#14 — in Giveaways and contests | \#2 — in Email marketing |  |
| 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 — English | 6 — English, French, Spanish |  |
| Developer | Union Works Apps | Klaviyo |  |

## Listed features

- 94 distinct features are listed across these App Store listings; 0 are listed by both.
- Happy Birthday Email by UW lists 22 of them (23%). Listed only by Happy Birthday Email by UW: Analytics, Analytics dashboard, Anniversary, Birthday, Branding, Checkout analytics, Cohort analysis, Conversion tracking, Custom CSS, Data export, Discount codes, Email templates, Forecasting, Form fields, Funnel analysis, Historical analysis, Landing pages, Loyalty analysis, Multi-language, Post-entry emails, Segmentation, Storefront widget.
- Klaviyo lists 72 of them (77%). Listed only by Klaviyo: A/B testing, Abandoned cart, AI generation, Analytics, APIs and webhooks, Automations, Back-in-stock emails, Birthday messages, Browse abandonment, Bulk editing, Bulk messaging, Cart emails, Cart recovery, Checkout emails, Compliance, Consent collection, Conversion metrics, Cross-sell emails, Custom campaigns, Custom code, Custom fonts, Custom segments, Custom sender ID, Discount codes, Discounts, Drip campaigns, Editor tool, Email campaigns, Email capture list, Email domains, Exit intent, Feedback requests, Follow-up emails, Forms, Geolocation, Import and export, Insights and tips, Localization, Newsletters, Opt-in, Order confirmations, Order tracking, Personalized messages, Pop-ups, Price drop emails, Product recommendations, Product reviews, Promotions, Push notifications, Real-time analytics, Reporting, ROI tracking, Scheduled messages, Segmentation, SMS campaigns, SMS capture list, Subscriptions, Tagging, Targeting, Templates, Tracking, Triggers and rules, Two-way messaging, Upsell emails, Welcome emails, Welcome messages, Win-back campaigns, Win-back emails.

### Coverage by App Store category

| Category | Happy Birthday Email by UW | Klaviyo |
| --- | --- | --- |
| Analytics | 9/9 | 0/9 |
| Analytics › Customer behavior | 3/3 | 0/3 |
| Analytics › Marketing and sales | 2/2 | 0/2 |
| Analytics › Visuals and reports | 4/4 | 0/4 |
| Email marketing | 0/49 | 49/49 |
| Email marketing › Campaign types | 0/25 | 25/25 |
| Email marketing › Managing campaigns | 0/24 | 24/24 |
| Giveaways and contests | 13/13 | 0/13 |
| Giveaways and contests › Campaign types | 2/2 | 0/2 |
| Giveaways and contests › Customization | 9/9 | 0/9 |
| Giveaways and contests › Submission management | 2/2 | 0/2 |
| SMS marketing | 0/23 | 23/23 |
| SMS marketing › Managing campaigns | 0/14 | 14/14 |
| SMS marketing › Workflow automation | 0/9 | 9/9 |

A feature missing from a listing may still be supported; this compares what each App Store listing says.

## Integrations

- Both list: Checkout, Customer accounts, Shopify Flow, recharge.
- Only Happy Birthday Email by UW lists: Shopify POS, Klaviyo, Mailchimp, SMSBump, omnisend, Privy.
- Only Klaviyo lists: Aftership, Typeform, Meta Advertising, Gorgias, TikTok Advertising.

## Pricing plans

### Happy Birthday Email by UW

| Plan | Price | Free trial | Additional charges |
| --- | --- | --- | --- |
| Base | $10/month | 28-day free trial | None listed |
| Growth | $20/month | 28-day free trial | None listed |
| Unlimited | $40/month | 28-day free trial | None listed |

### Klaviyo

| Plan | Price | Free trial | Additional charges |
| --- | --- | --- | --- |
| Free | Free to install | Not listed | Email marketing built into Shopify Admin — no separate account needed. |
| SMS | $15/month | Not listed | Up to 1250 SMS/MMS credits. Includes carrier fees. Upgrade as you grow. |
| Email | $20/month | Not listed | 251-500 contacts. Upgrade as you grow. |

## Frequently asked 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.

## Links

- [Happy Birthday Email by UW vs Klaviyo: Email Marketing & SMS on Shoplist](https://shoplist.co/shopify-apps/compare/happy-birthday-by-union-works-vs-klaviyo-email-marketing-sms)
- [Happy Birthday Email by UW on Shoplist](https://shoplist.co/shopify-apps/happy-birthday-by-union-works) ([Markdown](https://shoplist.co/shopify-apps/happy-birthday-by-union-works.md))
- [Klaviyo: Email Marketing & SMS on Shoplist](https://shoplist.co/shopify-apps/klaviyo-email-marketing-sms) ([Markdown](https://shoplist.co/shopify-apps/klaviyo-email-marketing-sms.md))

## Methodology

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 for Happy Birthday Email by UW and Klaviyo are as of Nov 7, 2026. “Not detectable from storefronts” means an app leaves no storefront trace, so Shoplist can’t count its stores. A row names who is ahead only when every app has a measured, unestimated figure. See [data methodology](https://shoplist.co/data-methodology.md).