Klaviyo
Swell
| Feature | Klaviyo | Swell |
|---|---|---|
| Pricing | Free / from $20/mo | Free / from $299/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.3 / 5 |
| Best For | ecommerce, shopify-stores, dtc-brands, online-retailers | developers, subscription-businesses, custom-ecommerce, b2b-commerce |
| Founded | 2012 | 2016 |
| Email Campaigns | ✓ | ✗ |
| Sms Marketing | ✓ | ✗ |
| Flows | ✓ | ✗ |
| Segmentation | ✓ | ✗ |
| Analytics | ✓ | ✗ |
| Ai Content | ✓ | ✗ |
| Headless Api | ✗ | ✓ |
| Subscriptions | ✗ | ✓ |
| Multi Currency | ✗ | ✓ |
| Custom Models | ✗ | ✓ |
| Webhooks | ✗ | ✓ |
| Admin Dashboard | ✗ | ✓ |
✓ Klaviyo Pros
- Deep e-commerce integration
- Powerful segmentation
- Revenue attribution
- Great flows
✗ Klaviyo Cons
- Gets expensive with list size
- Complex for beginners
- SMS extra cost
✓ Swell Pros
- Extremely flexible API
- Built-in subscription support
- Good for unique business models
- Developer-friendly
✗ Swell Cons
- Requires development resources
- Expensive for small stores
- Smaller ecosystem
The Verdict
Klaviyo is built for ecommerce and shopify stores, with a focus on email-campaigns and sms-marketing. Swell targets developers and subscription businesses and leads with headless-api and subscriptions.
On pricing, Klaviyo is the clear winner for budget-conscious users — starting at $20/mo compared to $299/mo for Swell. That $279/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.