Customer.io vs Substack: Pricing Comparison 2026
Side-by-side pricing comparison of Customer.io and Substack. See all plans, features, and costs at a glance.
Bottom line: Substack starts at $5/mo, making it $95/mo cheaper than Customer.io ($100/mo). Substack offers a free plan.
Last updated: March 16, 2026
Customer.io vs Substack: Quick Pricing Facts
| Feature | Customer.io | Substack |
|---|---|---|
| Starting Price | $100/mo | $5/mo |
| Number of Plans | 3 | 7 |
| Free Tier | No | Yes |
| Pricing Model | usage-based | usage-based |
| Annual Discount | N/A | N/A |
Substack is the more affordable option, starting at $5/mo compared to Customer.io's $100/mo. Both are Email Marketing tools with 10 combined pricing plans and 22 features compared.
Substack stands out with a free plan for getting started.
Review the detailed tier-by-tier comparison above to see exactly which features are included at each price point and find the best fit for your Email Marketing needs.
| Pricing Plans |  Customer.io Try it free |  Substack Try it free |
|---|---|---|
| Tier 1 | Essentials $100/month | Free $0/monthCheapest Includes
|
| Tier 2 | Premium $1000/month | Basic $5/monthCheapest $5 / year Includes
|
| Tier 3 | Enterprise Custom pricing | Standard $7/monthCheapest $7 / year Includes
|
| Tier 4 | — | Advanced $10/monthCheapest $10 / year Includes
|
| Tier 5 | — | Pro $15/monthCheapest $15 / year Includes
|
| Tier 6 | — | Premium $30/monthCheapest $30 / year Includes
|
| Tier 7 | — | Enterprise $75/monthCheapest $75 / year Includes
|
Swipe to compare plans →
Substack
Substack offers a free plan, starts at $95/mo lower ($5/mo vs $100/mo), offers 7 tiers vs 3.
Based on pricing data only. Review the full comparison below for your specific needs.
Best value: Substack
Try Substack freeWhich Should You Choose?
Choose Customer.io if:
- •Your team needs custom enterprise pricing—Customer.io offers negotiated terms for large deployments
- •Customer.io's 3-tier usage-based structure gives clearer cost visibility for budget planning
- •Customer.io's focused feature set keeps your team in control without tool bloat
Choose Substack if:
- •You want lower per-user costs—Substack starts at $5/mo, saving $95/mo compared to Customer.io at $100/mo
- •You need a free plan with Set up paid subscriptions, Keep 90% of revenue—Substack offers no-cost access with no credit card required
- •You need 7 pricing tiers for flexible team sizing—more options mean less overpaying for features you don't need
- •You want more features built-in—Substack offers 22 additional features across its plans
Substack is the more affordable choice [1], starting at $5/mo compared to Customer.io's $100/mo. For a 50-person team on paid plans, this translates to Substack saving approximately $4750/month. Substack offers 7 pricing tiers compared to Customer.io's 3, giving you more granular control over scaling costs as your team grows. Across all tiers, Substack provides 22 total features versus 0 for Customer.io, offering a richer feature set depending on your specific needs. For budget-conscious teams seeking predictable costs, Substack delivers superior value. Customer.io may justify its premium for specialized needs, but most organizations will find Substack the smarter financial choice.
Frequently Asked Questions: Customer.io vs Substack
Which is cheaper, Customer.io or Substack?
How many pricing plans does Customer.io have vs Substack?
Does Customer.io or Substack offer a free plan?
Can I save money by paying annually for Customer.io or Substack?
Does Customer.io or Substack offer custom enterprise pricing?
How do Customer.io and Substack compare for Email Marketing?
Sources
- Customer.io Official Pricing— Vendor pricing page
- Substack Official Pricing— Vendor pricing page
Related Articles
Track Price Changes
Get notified when pricing changes for these tools.