Mailgun vs Substack
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Mailgun is the stronger AI pick in Email Marketing: it has a visibility score of 0.9 versus 0 for Substack.
Choose Mailgun if…
- You want the brand AI engines rank higher (0.9 vs 0)
- You need SOC 2 Type II or ISO/IEC 27001 or ISO 27701 or GDPR compliant or HIPAA compliant or PCI-compliant SAQ-A merchant coverage
- recommended for sending larger volumes programmatically
Choose Substack if…
No clear advantage in the published data.
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Mailgun | Substack |
|---|---|---|
| Visibility score | 0.9% | 0% |
| Change vs last week | New | New |
| Rank in Email Marketing | #36 | #55 |
| Share of voice | 0.2% | 0% |
| Mentions this run | 1 | 0 |
| Positive in AI answers | 0% | — |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Mailgun 0pp · Substack 0pp over 0 weekly runs.
Engine by engine
Mailgun leads on 1 of 3 engines
Head to head in AI answers
0 engine answers name both brands
Features, pricing & fit
| Dimension | Mailgun | Substack |
|---|---|---|
| Pricing model | Usage-based | — |
| Entry price | Free; paid from $15 / mo | — |
| Free plan | Yes | — |
| Deployment | Cloud, hosted in US and EU regions | — |
| Compliance | SOC 2 Type II, ISO/IEC 27001, ISO 27701, GDPR compliant, HIPAA compliant, PCI-compliant SAQ-A merchant | — |
| Support | Knowledge Center, Documentation, Ticket support, Chat support on higher plans | Help center, Resource center, Community and programs |
| Founded | 2010 | 2017 |
| Employees | 201–500 | — |
| Funding | Growth investment (Thoma Bravo) · $51M raised | Series C · $200M raised |
| Best for | Developers and engineering teams that need to send transactional and marketing email through an API | Writers, journalists, podcasters, video creators and media companies that want to sell subscriptions directly to readers |
Plans side by side
Mailgun
Substack
Pricing not available.
Pros and cons
Themes from the AI answers that mention each brand
Mailgun
- recommended for sending larger volumes programmatically
Substack
Profile in progress.
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Mailgun vs Substack”, https://slateindex.ai/compare/mailgun-vs-substack, data of Nov 2, 2026. Licence: CC BY 4.0.