Email APIs · side by side
Campaign Monitor vs Klaviyo
Compare Campaign Monitor, Klaviyo by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Campaign Monitor
0
Klaviyo
10K
Campaign Monitor
$0 / mo
Free · 0 contacts
Klaviyo
Custom / not listed
Custom / unlisted usage pricing · 10K profiles
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Email APIs overview & pricing
| Email APIs | Campaign Monitor | Klaviyo |
|---|---|---|
| Provider | Marigold | Klaviyo |
| Billing unit | contacts | profiles |
| Plan at selected usage | Free | Custom / unlisted usage pricing |
| Monthly estimate | $0/mo | Custom / not listed |
| Workload | 0 contacts | 10K profiles |
| Free access | 30-day free trial for up to 500 contacts and 500 email sends | Limited free plan |
| Published plans | Free, Lite, Essentials, Premier, Enterprise | Free |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Campaign Monitor
- Marigold
- Klaviyo
- Klaviyo
Billing unit
- Campaign Monitor
- contacts
- Klaviyo
- profiles
Plan at selected usage
- Campaign Monitor
- Free
- Klaviyo
- Custom / unlisted usage pricing
Monthly estimate
- Campaign Monitor
- $0/mo
- Klaviyo
- Custom / not listed
Workload
- Campaign Monitor
- 0 contacts
- Klaviyo
- 10K profiles
Free access
- Campaign Monitor
- 30-day free trial for up to 500 contacts and 500 email sends
- Klaviyo
- Limited free plan
Published plans
- Campaign Monitor
- Free, Lite, Essentials, Premier, Enterprise
- Klaviyo
- Free
Prices checked
- Campaign Monitor
- 2026-10-08
- Klaviyo
- 2026-10-08
Email APIs monthly cost
Campaign Monitor: $0Klaviyo: Not priced
Different workloads, separate estimates
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Email APIs feature comparison
| Email APIs | Campaign Monitor | Klaviyo |
|---|---|---|
| Multiple users | Unlimited | Not listed |
| User roles & permissions | Not listed | |
| Two-factor authentication | Not listed | |
| Marketing Monitor | Not listed | |
| Drip Campaigns | Not listed | |
| Campaign Score | Not listed | |
| Contacts | 500 contacts for the 30-day free trial | Not listed |
| Monthly send volume | 500 email limit for the 30-day free trial | Not listed |
| Drag-and-drop builder | Not listed | |
| Customizable template library | Not listed | |
| Custom coded templates | Not listed | |
| Branded templates | Not listed | |
| Segmentation tools | Not listed | |
| Free image gallery | Not listed | |
| Signup forms | Limited | Not listed |
| Mobile optimization tools | Not listed | |
| A/B testing | Not listed | |
| Preference Center | Not listed | |
| Real-time reporting analytics | Limited | Not listed |
| Worldview reporting | Limited | Not listed |
| Email Workspace | Limited trial access | Not listed |
| Creative Lab | Limited trial access | Not listed |
| Brand Hub | Not listed | |
| Translation | Not listed | |
| Social Suite | Limited trial access | Not listed |
| Campaign Series | Not listed | |
| AI Email Booster | Not listed | |
| AI Segment Mapper | Not listed | |
| AI Writer | Not listed | |
| Automated emails | Not listed | |
| Prebuilt journeys | Not listed | |
| Non-human click filter | Not listed | |
| Subject line recommendations | Not listed | |
| Engagement segments | Not listed | |
| RSS feed trigger | Not listed | |
| Transactional emails | Not listed | |
| Campaign tags | Not listed | |
| Dynamic content | Limited | Not listed |
| Custom fields | Not listed | |
| Countdown timer | Not listed | |
| Time zone sending | Not listed | |
| Send time optimization | Not listed | |
| Email section locking | Not listed | |
| Advanced link tracking | Not listed | |
| Link review | Not listed | |
| Design & spam testing | Not listed | |
| AI Support Agent | Not listed | |
| Email support | Not listed | |
| Phone support | Not listed | |
| Deliverability support | Not listed | |
| Help Center | Not listed | |
| Training videos | Not listed | |
| Campaign Monitor 101 | Not listed | |
| Website Builder | Not listed | |
| API access | Not listed |
Multiple users
- Campaign Monitor
- Unlimited
- Klaviyo
- Not listed
User roles & permissions
- Campaign Monitor
- Klaviyo
- Not listed
Two-factor authentication
- Campaign Monitor
- Klaviyo
- Not listed
Marketing Monitor
- Campaign Monitor
- Klaviyo
- Not listed
Drip Campaigns
- Campaign Monitor
- Klaviyo
- Not listed
Campaign Score
- Campaign Monitor
- Klaviyo
- Not listed
Contacts
- Campaign Monitor
- 500 contacts for the 30-day free trial
- Klaviyo
- Not listed
Monthly send volume
- Campaign Monitor
- 500 email limit for the 30-day free trial
- Klaviyo
- Not listed
Drag-and-drop builder
- Campaign Monitor
- Klaviyo
- Not listed
Customizable template library
- Campaign Monitor
- Klaviyo
- Not listed
Custom coded templates
- Campaign Monitor
- Klaviyo
- Not listed
Branded templates
- Campaign Monitor
- Klaviyo
- Not listed
Segmentation tools
- Campaign Monitor
- Klaviyo
- Not listed
Free image gallery
- Campaign Monitor
- Klaviyo
- Not listed
Signup forms
- Campaign Monitor
- Limited
- Klaviyo
- Not listed
Mobile optimization tools
- Campaign Monitor
- Klaviyo
- Not listed
A/B testing
- Campaign Monitor
- Klaviyo
- Not listed
Preference Center
- Campaign Monitor
- Klaviyo
- Not listed
Real-time reporting analytics
- Campaign Monitor
- Limited
- Klaviyo
- Not listed
Worldview reporting
- Campaign Monitor
- Limited
- Klaviyo
- Not listed
Email Workspace
- Campaign Monitor
- Limited trial access
- Klaviyo
- Not listed
Creative Lab
- Campaign Monitor
- Limited trial access
- Klaviyo
- Not listed
Brand Hub
- Campaign Monitor
- Klaviyo
- Not listed
Translation
- Campaign Monitor
- Klaviyo
- Not listed
Social Suite
- Campaign Monitor
- Limited trial access
- Klaviyo
- Not listed
Campaign Series
- Campaign Monitor
- Klaviyo
- Not listed
AI Email Booster
- Campaign Monitor
- Klaviyo
- Not listed
AI Segment Mapper
- Campaign Monitor
- Klaviyo
- Not listed
AI Writer
- Campaign Monitor
- Klaviyo
- Not listed
Automated emails
- Campaign Monitor
- Klaviyo
- Not listed
Prebuilt journeys
- Campaign Monitor
- Klaviyo
- Not listed
Non-human click filter
- Campaign Monitor
- Klaviyo
- Not listed
Subject line recommendations
- Campaign Monitor
- Klaviyo
- Not listed
Engagement segments
- Campaign Monitor
- Klaviyo
- Not listed
RSS feed trigger
- Campaign Monitor
- Klaviyo
- Not listed
Transactional emails
- Campaign Monitor
- Klaviyo
- Not listed
Campaign tags
- Campaign Monitor
- Klaviyo
- Not listed
Dynamic content
- Campaign Monitor
- Limited
- Klaviyo
- Not listed
Custom fields
- Campaign Monitor
- Klaviyo
- Not listed
Countdown timer
- Campaign Monitor
- Klaviyo
- Not listed
Time zone sending
- Campaign Monitor
- Klaviyo
- Not listed
Send time optimization
- Campaign Monitor
- Klaviyo
- Not listed
Email section locking
- Campaign Monitor
- Klaviyo
- Not listed
Advanced link tracking
- Campaign Monitor
- Klaviyo
- Not listed
Link review
- Campaign Monitor
- Klaviyo
- Not listed
Design & spam testing
- Campaign Monitor
- Klaviyo
- Not listed
AI Support Agent
- Campaign Monitor
- Klaviyo
- Not listed
Email support
- Campaign Monitor
- Klaviyo
- Not listed
Phone support
- Campaign Monitor
- Klaviyo
- Not listed
Deliverability support
- Campaign Monitor
- Klaviyo
- Not listed
Help Center
- Campaign Monitor
- Klaviyo
- Not listed
Training videos
- Campaign Monitor
- Klaviyo
- Not listed
Campaign Monitor 101
- Campaign Monitor
- Klaviyo
- Not listed
Website Builder
- Campaign Monitor
- Klaviyo
- Not listed
API access
- Campaign Monitor
- Klaviyo
- Not listed
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Which email providers fit your needs?
Campaign Monitor features & plan notes
- Drag-and-drop email builder with custom HTML template import
- Visual customer journey automation and drip campaigns
- Built-in transactional email sending with REST API integration
- A/B testing, inbox preview, and spam testing tools
- Send time optimization and engagement-based segmentation on higher tiers
- 500 contacts for the 30-day free trial
- 500 email limit for the 30-day free trial
- Multiple users (Unlimited)
- User roles & permissions
- Two-factor authentication
- Core email features
- Limited signup forms
- Limited real-time reporting analytics
- Limited Worldview reporting
- Limited trial access to Marketing Studio (Email Workspace, Creative Lab, Social Suite)
- Dynamic content (Limited)
Klaviyo features & plan notes
- E-commerce data
- Omnichannel
- Shopify ecosystem
How to compare email providers
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Browse Email APIs pricing