Keap vs Substack
Keap is a all-in-one marketing platform while Substack is a newsletter platform. Keap has been around since 2001, giving it a 16-year head start over Substack (founded 2017). Substack starts at free versus $299/mo for Keap. Substack offers a free plan (Unlimited subscribers, unlimited emails, all core features free — Substack only charges when you earn), while Keap does not. Keap has the edge with marketing automation, A/B testing, landing pages.
Quick Verdict
Keap wins on integrations.
Substack wins on price, deliverability, rating, free tier.
Best for most users: Substack (independent writers and journalists).
Keap
CRM-powered sales and marketing automation for small businesses
Keap (formerly Infusionsoft, founded 2001, acquired by Thryv in 2024) is a premium all-in-one CRM and marketing automation platform built for sales-driven small businesses that need contact management, email sequences, SMS marketing, invoicing, and appointment scheduling in a single tool. Its strength lies in powerful automation workflows and a dedicated Customer Success Manager, but the $299/month starting price for just 1,500 contacts makes it one of the most expensive options in its category.
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 | Keap | Substack |
|---|---|---|
| Rating | 4.2/5 | 4.4/5 |
| Starting Price | $299/mo | Free |
| Free Plan | No free plan | Unlimited subscribers, unlimited emails, all core features free — Substack only charges when you earn |
| Founded | 2001 | 2017 |
| Email Templates | 70 | 1 |
| Integrations | 5,000 | 0 |
| Deliverability Rate | 93% | 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 | ✓ | ✕ |
Keap: Pros & Cons
Pros
- +Powerful drag-and-drop automation builder that handles complex multi-step sales workflows with conditional triggers
- +True all-in-one platform combining CRM, email, SMS, invoicing, payments, and appointment scheduling
- +Dedicated Customer Success Manager included with every plan for hands-on onboarding and support
- +Deep contact management with tagging, segmentation, and centralized views that reduce manual data entry
- +Built-in text marketing with tiered messaging plans and voice minutes integrated directly into automations
Cons
- −Extremely expensive at $299/month for only 1,500 contacts, with costs escalating quickly for additional contacts and users
- −Steep learning curve with complex campaign builder layouts and no undo button, causing frustration during setup
- −Email marketing capabilities feel half-baked compared to dedicated email platforms despite the premium pricing
- −Invoicing feature is rigid and does not support hourly billing or flexible customization
- −Dated mobile experience and slow feature development compared to more agile competitors like GoHighLevel
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
Substack edges ahead with a 4.4/5 rating compared to Keap's 4.2/5. The gap comes mainly from value for money (4.9 vs 3.7) and deliverability (4.4 vs 3.9). On deliverability, Substack reports 95% compared to 93% for Keap — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | Keap | Substack |
|---|---|---|---|
| Starting Price | 30% | $299/mo | Free |
| Deliverability | 25% | 93% | 95% |
| Rating | 25% | 4.2/5 | 4.4/5 |
| Integrations | 10% | 5000 | 0 |
| Free Tier | 10% | No | Yes |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose Keap if…
- + You need SMS marketing
- + You need marketing automation
- + You need ecommerce integrations
- + You need API access for custom integrations
Choose Substack if…
- + You want lower starting costs (Free)
- + You need a free plan to get started
- + You're a independent writers and journalists
- + You're a newsletter creators monetizing through paid subscriptions