toolgrep / Email & messaging / KaiMail
Alternatives to KaiMail
KaiMail: Email forwarding for custom domains. 8 products similar to KaiMail, compared on pricing, free tier, API, MCP server, SDK and open source. 8 of 8 have a free tier, 7 of 8 have an API, 3 of 8 offer an MCP server, 4 of 8 are open source.
- ImprovMX
Email forwarding for custom domains, with SMTP sending and a JSON send API.
- Forward Email
Free email forwarding for custom domains with open-source email hosting, sending, and a developer API.
- Webhook.site
Test, transform and automate web requests and emails
- Resend
Email API for developers
- Alias Email
Free email alias service that forwards messages to your main inbox
- addy.io
Open-source anonymous email forwarding with unlimited aliases
- SimpleLogin
Open source anonymous email alias service
- anon.li Alias
Privacy-first email aliases and forwarding
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| KaiMail | Freemium · from ¥550/month | yes | yes | no | no | — |
| ImprovMX | Freemium · from $9/month | yes | yes | no | — | no |
| Forward Email | Freemium · from $3/month | yes | yes | yes | — | yes |
| Webhook.site | Freemium · from 7.5 | yes | yes | — | — | — |
| Resend | Freemium | yes | yes | yes | yes | no |
| Alias Email | Freemium · from $3.33 | yes | no | no | no | no |
| addy.io | Freemium · from $1/month (Lite, billed yearly); Pro $3/month billed yearly or $4/month billed monthly; Duo $4.50/month; Family $7.50/month | yes | yes | no | no | yes |
| SimpleLogin | Freemium · from $4/month (Premium, billed monthly) or $36/year; Free plan with 10 aliases | yes | yes | no | yes | yes |
| anon.li Alias | Freemium | yes | yes | yes | no | yes |
Facts come from each product's own website, or from its verified owner when they have edited the listing. Each product page shows when it was last verified and how it was extracted. Similarity comes from the products' descriptions.
API
curl https://toolgrep.com/api/products/kaimail/alternatives