15Five vs ConvertKit vs Medium vs Substack
| Attribute | ||||
|---|---|---|---|---|
| Category | HR & Recruiting | Email Marketing | Content & Writing | Email & Messaging Marketing |
| Pricing | Paid | Paid | Free tier | Free tier |
| Starting price | $4/month | $0/month | $5/month | $10/month |
| Free tier | No | No | Yes | Yes |
| Free trial | Yes | Yes | No | No |
| Deployment | — | Cloud | Cloud | — |
| API available | Unknown | Unknown | Unknown | Unknown |
| Platforms | — | — | — | — |
| Certifications | — | — | — | — |
| Integrations | — | 3 | — | — |
| Company | Founded 2011 | — | Founded 2012 | Founded 2017 |
| Feature attributes | ||||
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.