Iterable vs Substack
Iterable is a all-in-one marketing platform while Substack is a newsletter platform. Iterable has been around since 2013, giving it a 4-year head start over Substack (founded 2017). Iterable starts at custom pricing versus free for Substack. Substack offers a free plan (Unlimited subscribers, unlimited emails, all core features free — Substack only charges when you earn), while Iterable does not. Iterable has the edge with marketing automation, A/B testing, SMS marketing.
Quick Verdict
Iterable wins on deliverability, integrations.
Substack wins on rating, free tier.
It's a close call — your choice depends on your specific needs.
Iterable
Campaigns are out. Moments are in.
Iterable is an AI-powered cross-channel marketing platform that helps brands create individualized customer experiences across email, SMS, push, in-app, and web. It focuses on turning behavioral data into personalized moments rather than batch campaigns, best suited for growth-stage and enterprise companies.
Substack
The newsletter platform where writers build independent media businesses
Substack is the dominant newsletter platform that uniquely combines free publishing tools with a 10% revenue-share model, letting writers launch subscription-based media businesses with zero upfront cost. Beyond newsletters, it has evolved into a full creator ecosystem with podcasts, video, livestreaming, Notes (microblogging), and community Chat, backed by a powerful built-in discovery network that helps writers find audiences organically.
Feature Comparison
| Feature | Iterable | Substack |
|---|---|---|
| Rating | 4.3/5 | 4.4/5 |
| Starting Price | Custom | Free |
| Free Plan | No free plan | Unlimited subscribers, unlimited emails, all core features free — Substack only charges when you earn |
| Founded | 2013 | 2017 |
| Email Templates | 80 | 1 |
| Integrations | 150 | 0 |
| Deliverability Rate | 97% | 95% |
| Marketing Automation | ✓ | ✕ |
| A/B Testing | ✓ | ✕ |
| Landing Pages | ✕ | ✕ |
| Segmentation | ✓ | ✕ |
| Drag & Drop Editor | ✓ | ✕ |
| SMS Marketing | ✓ | ✕ |
| Ecommerce Features | ✓ | ✕ |
| API Access | ✓ | ✕ |
| Multi-Language | ✓ | ✕ |
| Web Push Notifications | ✓ | ✕ |
| Live Chat | ✕ | ✕ |
| Advanced Analytics | ✓ | ✕ |
Iterable: Pros & Cons
Pros
- +Cross-channel orchestration across email, SMS, push, in-app, and web messaging
- +AI-powered send time optimization and content personalization
- +Flexible data model with real-time behavioral event tracking
- +150+ technology partner integrations
- +AI-powered send time optimization improves engagement across channels
Cons
- −No public pricing, requires demo and sales conversation
- −No free plan or self-service trial
- −Complex initial setup typically requires a dedicated implementation phase
- −Too expensive for small businesses
- −Pricing is not publicly listed — requires sales conversation
Substack: Pros & Cons
Pros
- +Completely free to start with no upfront costs — zero barrier to entry with all core publishing features available immediately
- +Built-in audience discovery network with Recommendations and Notes driving organic subscriber growth (users report gaining 1,000+ subscribers through Recommendations alone)
- +True content ownership: creators can export their full subscriber list and content at any time to migrate elsewhere
- +Multimedia platform supporting newsletters, podcasts, video, livestreaming, Notes, and Chat communities in a single integrated experience
- +Strong reader engagement with genuine community interaction through comments, Chat, and Notes — higher engagement rates than typical social media platforms
Cons
- −The 10% platform fee plus Stripe's ~2.9% + $0.30 per transaction creates a 13-16% total take rate that becomes very expensive at scale (e.g., $1,300-$1,600/month on $10K revenue)
- −No email marketing automation, segmentation, A/B testing, or advanced personalization — all subscribers receive identical emails with no conditional logic
- −No public API and zero native third-party integrations — cannot connect to CRMs, e-commerce platforms, Zapier, or other marketing tools
- −Limited design customization with a single standardized template — no drag-and-drop editor, no custom HTML, and minimal branding options
- −Platform can remove content or delete accounts without notice, and customer support is difficult to reach for issue resolution
The Verdict
Iterable and Substack are closely matched — both score within 0.1 points of each other in our overall rating. Your decision should come down to specific needs rather than overall quality. On deliverability, Iterable reports 97% compared to 95% for Substack — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | Iterable | Substack |
|---|---|---|---|
| Starting Price | 30% | Free | Free |
| Deliverability | 25% | 97% | 95% |
| Rating | 25% | 4.3/5 | 4.4/5 |
| Integrations | 10% | 150 | 0 |
| Free Tier | 10% | No | Yes |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose Iterable if…
- + You need SMS marketing
- + You need marketing automation
- + You need ecommerce integrations
- + You need API access for custom integrations
Choose Substack if…
- + You need a free plan to get started
- + You're a independent writers and journalists
- + You're a newsletter creators monetizing through paid subscriptions