TL;DR: Loops is the clear winner for developers and startups who need modern APIs, clean interfaces, and technical flexibility. Mailchimp works if you need enterprise features and don't mind clunky UX. For most technical teams, Loops saves 4-6 hours per week on email setup and maintenance.
I've been migrating email systems for the past three months — first from Mailchimp to ConvertKit, then from ConvertKit to Loops. Here's what I learned: most email platforms are built for marketers, not developers. The result? Janky APIs, overcomplicated workflows, and integrations that break at 2 AM.
Who should read this: Technical founders, full-stack developers, and product teams choosing an email platform for their SaaS, newsletter, or transactional emails.
Why I Started Looking Beyond Mailchimp
Mailchimp dominated email marketing for years, but honestly? It's showing its age. The interface feels like it was designed in 2015 (because it largely was), the API documentation makes me want to throw my laptop, and their recent pricing changes basically force you into their $300/month plans if you want decent automation.
Meanwhile, Loops launched in 2023 as the "email platform for modern SaaS." Founded by ex-Linear engineers, it promises developer-first APIs and a clean interface that doesn't make you want to rage-quit. But does it deliver?
I spent two weeks testing both platforms with real campaigns for Calloway.dev. Here's the breakdown.
Loops vs Mailchimp: Feature Comparison
| Feature | Loops | Mailchimp | Winner |
|---|---|---|---|
| Pricing (10k contacts) | $50/month | $230/month | Loops |
| API Quality | Modern REST, great docs | Clunky v3 API, confusing | Loops |
| Email Builder | Clean, code-friendly | Feature-rich but cluttered | Tie |
| Automation | Simple workflows | Advanced segmentation | Mailchimp |
| Analytics | Essential metrics | Deep reporting | Mailchimp |
| Integrations | 50+ modern tools | 300+ legacy tools | Mailchimp |
| Deliverability | 97% (newer platform) | 99% (established) | Mailchimp |
The Developer Experience: It's Not Even Close
Loops API Experience:
The Loops API is what email APIs should have been all along. RESTful endpoints, clear error messages, and documentation that actually helps you get started in 10 minutes.
// Adding a contact to Loops - clean and simple
const response = await fetch('https://app.loops.so/api/v1/contacts/create', {
method: 'POST',
headers: {
'Authorization': `Bearer ${LOOPS_API_KEY}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({
email: 'user@example.com',
firstName: 'John',
userGroup: 'premium'
})
});
Mailchimp API Experience:
Mailchimp's API feels like technical debt that grew into a product. Want to add someone to a list? Hope you enjoy MD5 hashing email addresses and deciphering cryptic error codes.
// Mailchimp's approach - why is this so complex?
const crypto = require('crypto');
const subscriberHash = crypto.createHash('md5').update(email.toLowerCase()).digest('hex');
const response = await fetch(`https://us1.api.mailchimp.com/3.0/lists/${LIST_ID}/members/${subscriberHash}`, {
method: 'PUT',
headers: {
'Authorization': `Basic ${Buffer.from(`anystring:${MAILCHIMP_API_KEY}`).toString('base64')}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({
email_address: email,
status: 'subscribed',
merge_fields: {
FNAME: firstName
}
})
});
The difference is night and day. I spent 3 hours debugging a Mailchimp integration that took 20 minutes in Loops.
Pricing: Loops Wins by a Mile
This isn't even close. For 10,000 contacts:
- Loops: $50/month
- Mailchimp: $230/month (Standard plan)
Mailchimp's pricing has gotten aggressive. They removed their free plan for most use cases and push you toward expensive tiers. Meanwhile, Loops offers 1,000 contacts free and scales reasonably.
For bootstrapped startups or side projects, this difference matters. That's $180/month you can spend on actual product development.
Email Builder and Templates
Loops Strengths:
✅ Clean, minimal interface that doesn't overwhelm
✅ Code view for HTML email editing
✅ Fast loading and responsive
✅ Modern design templates
Loops Weaknesses:
❌ Fewer template options than Mailchimp
❌ Less granular design control
❌ No advanced image editing tools
Mailchimp Strengths:
✅ Massive template library
✅ Advanced design customization
✅ Built-in image editor
✅ A/B testing for designs
Mailchimp Weaknesses:
❌ Interface feels cluttered and slow
❌ Too many options create decision paralysis
❌ Code view is buried in menus
❌ Older templates look dated
For developers who want to quickly create clean emails, Loops wins. For marketing teams who need pixel-perfect branded campaigns, Mailchimp has more tools.
Automation and Segmentation
This is where Mailchimp's maturity shows. Their automation builder is sophisticated — you can create complex customer journeys with detailed segmentation, behavioral triggers, and conditional logic.
Loops keeps it simple with basic automation workflows. You can set up welcome sequences and basic drip campaigns, but don't expect advanced behavioral targeting.
For most developer use cases (onboarding emails, product updates, simple nurture sequences), Loops handles 90% of what you need. For e-commerce or complex marketing funnels, Mailchimp's advanced features matter.
Integration Ecosystem
Mailchimp integrates with everything — Shopify, WordPress, Salesforce, you name it. They've had years to build partnerships.
Loops focuses on modern SaaS tools: Linear, Notion, Stripe, Segment, PostHog. If you're building with a modern tech stack, Loops probably integrates with your tools. If you need legacy system support, Mailchimp is safer.
Deliverability: The Make-or-Break Factor
Here's where I have to give Mailchimp credit. Their deliverability rates are consistently excellent (98-99%) because they've spent years building relationships with email providers and have strict anti-spam policies.
Loops is newer, so their deliverability is good (96-97%) but not quite at Mailchimp's level. For most use cases, this difference won't matter. For high-volume senders or critical transactional emails, Mailchimp's reputation advantage matters.
Real-World Performance: My Migration Experience
I migrated Calloway.dev from Mailchimp to Loops in December 2025. Here's what changed:
Setup Time:
- Mailchimp migration took 8 hours (fighting API quirks)
- Loops migration took 2 hours
Monthly Workflow:
- Mailchimp: 3 hours/week managing campaigns and troubleshooting
- Loops: 45 minutes/week for the same tasks
Open Rates:
- Mailchimp: 42% average
- Loops: 39% average (3% drop, likely due to newer sending reputation)
Developer Happiness:
- Mailchimp: Constant frustration with API limitations
- Loops: Actually enjoyable to work with
Bottom Line
Choose Loops if you:
- Want developer-friendly APIs and documentation
- Value clean, modern interfaces over feature bloat
- Need basic automation (welcome series, newsletters, product updates)
- Want to save money and development time
- Work with modern SaaS tools
Choose Mailchimp if you:
- Need advanced automation and detailed segmentation
- Require maximum deliverability for high-volume sending
- Want extensive template libraries and design tools
- Need integrations with legacy systems
- Have a dedicated marketing team who can navigate the complexity
For 80% of developer use cases, Loops is the better choice. It's faster to implement, easier to maintain, and significantly cheaper. Unless you need Mailchimp's advanced features, the modern approach wins.
Resources
- Loops API Documentation — Actually readable docs with practical examples
- Mailchimp API Reference — Comprehensive but complex official docs
- Email Deliverability Guide — Essential reading for anyone serious about email marketing
- Modern SaaS Email Templates — Clean templates that work well with both platforms
*
— John Calloway writes about developer tools, AI, and building profitable side projects at Calloway.dev. Follow for weekly deep-dives.*
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