Quick Verdict: Klaviyo vs Brevo
Winner
Klaviyo (deliverability) / Brevo (cost at low volume)
Klaviyo's e-commerce-segmented infrastructure produces better inbox placement for high-volume DTC senders. Brevo's volume-based pricing model (pay per send, not per contact) makes it dramatically cheaper for large lists with low send frequency — at the cost of less e-commerce-specific deliverability infrastructure.
| Factor | Klaviyo | Brevo |
|---|---|---|
| Pricing model | Contact-based (per stored contact) | Volume-based (per email sent) |
| Cost at 100K contacts, 2x/month | ~$400–700/mo | ~$65/mo (Starter) |
| IP infrastructure | Proprietary, e-commerce segmented | Proprietary shared (transactional + marketing) |
| Dedicated IPs | ~$120/mo at 250K+/mo | From ~$145/mo (Business plan) |
| Avg inbox rate | ~90–95% (DTC e-commerce) | ~85–91% |
| Transactional email | Limited (add-on) | Yes — core product strength |
| Frequency control | Smart Sending | Basic send time optimization |
How Klaviyo Handles Deliverability
Infrastructure
Klaviyo's proprietary e-commerce-segmented shared IP pools with active compliance enforcement. Best for high-frequency e-commerce sends where pool quality directly affects revenue.
IP Type
Shared (e-commerce-segmented) + optional dedicated
Dedicated IPs
~$120/month. Recommended for 250K+/month.
Avg Inbox Rate
90–95% for well-managed DTC senders
Strengths
- E-commerce vertical pool segmentation
- Smart Sending frequency governor
- Best-in-class e-commerce attribution
- Deep Shopify integration
Common Deliverability Problems
- Expensive for large lists with low send frequency
- Default signing requires custom domain for DMARC
- Q4 shared pool pressure from high-volume senders
What Klaviyo Shows You
- Open rate
- Click rate
- Revenue attributed
- Bounce rate
- Unsubscribe rate
What Klaviyo Doesn't Show You
- Gmail domain reputation
- Gmail spam rate
- Yahoo complaint rate
- Inbox placement rate
- Bot click filtering
- Blacklist status
How Brevo Handles Deliverability
Infrastructure
Brevo (formerly Sendinblue) operates its own infrastructure with shared pools spanning both transactional and marketing email senders. Brevo's strength is transactional deliverability — its pools have been built around reliable transactional performance. Marketing email shares this infrastructure. The mixed pool (transactional + marketing) is less vertically segmented than Klaviyo's e-commerce pools but benefits from Brevo's transactional reputation.
IP Type
Shared (transactional + marketing mix) + optional dedicated
Dedicated IPs
Business plan ($65+/mo) includes one dedicated IP. Additional IPs available at extra cost.
Avg Inbox Rate
85–91% for marketing campaigns; higher for transactional
Strengths
- Volume-based pricing dramatically cheaper for large infrequent lists
- Strong transactional email (receipts, OTPs, notifications)
- Dedicated IP included on Business plan
- Multi-channel: SMS, WhatsApp, email, push
- GDPR-compliant EU infrastructure available
Common Deliverability Problems
- Less e-commerce-specific segmentation than Klaviyo
- Marketing pool reputation influenced by transactional volume patterns
- Less sophisticated e-commerce automation templates
What Brevo Shows You
- Open rate
- Click rate
- Bounce rate
- Unsubscribe rate
- Transactional email logs (real-time)
What Brevo Doesn't Show You
- Gmail domain reputation
- Gmail spam rate
- Yahoo complaint rate
- Inbox placement rate
- Bot click filtering
- Blacklist status
Authentication Setup Compared
Settings → Email → Sending Domains → Add CNAME records → verify.
Settings → Senders & IP → Domains → Add domain → Add DKIM TXT record → verify.
After configuring authentication with either ESP, publish a DMARC record for your sending domain using InboxEagle's DMARC Record Generator. Start with p=none to collect data without affecting delivery, then advance to p=quarantine and eventually p=reject once all your sending streams pass DMARC alignment.
What Both Klaviyo and Brevo Don't Show You
Regardless of which ESP you choose, both platforms leave the same critical deliverability data invisible. These monitoring gaps exist across virtually every ESP:
- Neither shows Gmail domain reputation from Google Postmaster Tools
- Neither provides Yahoo Sender Hub complaint rate data
- Neither offers seed list inbox placement testing
- Neither filters bot clicks from security scanners
- Neither monitors blacklist status in real time
The monitoring gap that costs revenue
Your ESP shows you "delivered" — but delivered to the inbox, spam folder, or promotions tab? Without inbox placement testing, you're measuring delivery to the server, not delivery to the reader. A 99% delivery rate can hide a 30–40% spam placement rate. InboxEagle's seed list testing answers where your email actually lands, not just whether it was accepted.
Which Should You Choose?
Klaviyo wins on deliverability infrastructure for high-frequency e-commerce sending. Brevo wins on pricing for large infrequent lists and transactional email. Neither platform provides Gmail reputation, Yahoo complaint data, inbox placement testing, or bot click filtering — monitoring InboxEagle provides regardless of which platform you use.
Choose Klaviyo if...
You're a DTC e-commerce brand sending frequent campaigns to engaged subscriber segments and email is a direct revenue channel. Klaviyo's vertical infrastructure and e-commerce attribution justify the higher contact-based pricing.
Choose Brevo if...
You have a large list but send infrequently (1–2x/month or less), need transactional + marketing on one platform, or need to minimize ESP cost while maintaining acceptable deliverability. Brevo's volume pricing can save thousands per month for this usage pattern.
No matter which platform you choose, you'll need external monitoring for Gmail domain reputation, Yahoo complaint rate data, inbox placement testing, and bot click detection. InboxEagle provides all of these alongside Klaviyo, Brevo, and any other ESP.
Monitor Inbox Placement for Any ESP
InboxEagle adds Gmail domain reputation, Yahoo complaint monitoring, inbox placement testing, bot click detection, and DMARC reporting on top of Klaviyo, Brevo, and any other ESP you use.