Loops vs Substack

Detailed side-by-side comparison

Loops

Free

Loops is a modern email marketing platform specifically designed for SaaS companies and product teams. It combines transactional and marketing email capabilities with a developer-friendly API, offering powerful automation and segmentation features in a clean, intuitive interface.

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Substack

Free

Substack is an all-in-one newsletter platform built for writers and content creators who want to publish and monetize their work. It combines email newsletters, website hosting, payment processing, and community features into a simple, no-code solution that charges a 10% platform fee on paid subscriptions.

Visit Substack

Feature Comparison

Feature	Loops	Substack
Primary Use Case	Built for SaaS product teams to send transactional emails, onboarding sequences, and automated campaigns triggered by user behavior	Designed for writers and creators to publish editorial newsletters and build paid subscription businesses around their content
Developer Integration	Robust API and SDK integrations with React Email support, enabling developers to trigger emails based on application events and user actions	Minimal developer tools; primarily a no-code platform focused on writing and publishing without technical implementation
Email Automation	Event-based automation with triggered campaigns based on user behavior, segmentation rules, and product usage patterns	Basic scheduling and publishing tools; limited automation beyond scheduled newsletter delivery
Monetization	Not focused on monetization; designed for operational and marketing emails to support SaaS business operations	Built-in payment processing and subscription management with integrated billing for free and paid newsletter tiers
Content Publishing	Email-focused with analytics on deliverability and engagement; no built-in website or content archive hosting	Includes website hosting, newsletter archives, podcast hosting, and mobile apps for readers to consume content
Customization & Branding	Visual email editor with React Email support allowing custom-coded templates and flexible design options for product teams	Limited design customization with standardized templates; focuses on content over design flexibility

Pricing Comparison

Both platforms start at $0/month, but with different models: Loops offers free tiers with paid plans based on subscriber volume and email sends, while Substack remains free indefinitely but takes a 10% cut of all paid subscription revenue. For SaaS companies sending high volumes of transactional emails, Loops will likely be more cost-effective, while writers monetizing newsletters may prefer Substack's pay-as-you-earn model initially.

Verdict

Choose Loops if...

Choose Loops if you're a SaaS company or product team that needs to send transactional emails, automated onboarding sequences, and behavior-triggered campaigns with strong developer integration and API capabilities.

Choose Substack if...

Choose Substack if you're a writer, journalist, or content creator who wants to publish newsletters, build an audience, and monetize through paid subscriptions without technical complexity or upfront costs.

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Email Marketing

Pros & Cons

Loops

Pros

+ Clean, intuitive interface designed for modern product teams
+ Strong developer experience with excellent documentation
+ Fast email delivery with high deliverability rates
+ Affordable pricing compared to enterprise alternatives

Cons

- Relatively new platform with smaller feature set than established competitors
- Limited advanced automation compared to tools like ActiveCampaign
- Smaller template library and integrations ecosystem

Substack

Pros

+ No upfront costs - only pays when you earn through 10% platform fee
+ Extremely simple setup with minimal technical knowledge required
+ Writers own their subscriber list and can export at any time
+ Built-in discovery through Substack network and recommendations

Cons

- Limited customization and branding options compared to dedicated email tools
- 10% platform fee can become expensive as revenue scales
- Basic email design and layout capabilities with fewer templates