Email Monster vs Addy.io: aliases, pricing, limits
Last reviewed: 25 September 2026
Addy.io wins if you want open source code and the ability to reply from an alias on a paid plan. Email Monster wins if you want a bigger free tier and newsletter digests without paying anything. Neither lets you self host aliases on a free plan with unlimited sending.
An email alias is a throwaway forwarding address you hand out instead of your real inbox, so a leak or a spam flood can be shut off by disabling one address. Addy.io and Email Monster both generate these addresses, but they differ in cost, openness, and whether you can reply from the alias itself.
Feature comparison
| Criteria | Email Monster | Addy.io |
|---|---|---|
| Price (paid) | $6.99/year or $2.99/month | $1 to $10/month depending on tier |
| Free tier | Yes, 40 forwarded emails a month | Yes, $0/month |
| Alias limit | Unlimited, made up on first use | 10 aliases on the free plan |
| Custom domain | No, personal subdomain only | Yes, on paid tiers |
| Reply from alias | No | Yes, paid plans only |
| Sender blocking | Yes, per alias | Yes, per alias |
| Newsletter digest | Yes, weekly or daily | No |
| Browser extension | No | Yes, Chrome, Firefox, Edge, Safari |
| Open source | No | Yes |
| Jurisdiction | Not published | Not disclosed publicly |
| Best for | Unlimited free aliases plus digests | Reply from alias, open source code |
Facts verified on 25 September 2026 against Addy.io's public pricing page.
Where Addy.io wins
Addy.io is genuinely open source, so you can read the code or self host it. On paid tiers you can reply from an alias, which keeps a conversation going without exposing your real address, something Email Monster does not offer at any price. Addy.io also lets you attach a real custom domain on paid plans.
Where Email Monster wins
Email Monster's free plan allows 40 forwarded emails a month with unlimited aliases you make up on the spot, no 10 alias cap. Premium is $6.99 a year, cheaper than every paid Addy.io tier, and includes a weekly or daily newsletter digest that Addy.io does not offer at all.
Who should pick which
Pick Addy.io if replying from an alias or reading the source code matters to you and you are comfortable paying monthly. Pick Email Monster if you want the largest possible free tier, a lower annual price, and newsletter digest bundling, and you can live without replying from the alias address itself.
Frequently asked questions
Can I reply from an alias with either service?
Addy.io supports replying from an alias on its paid plans. Email Monster forwards mail to your real inbox but does not currently support sending or replying from the alias address.
Is Addy.io really free to use?
Yes, Addy.io has a $0 plan capped at 10 aliases on a shared domain with no custom domain support. Paid tiers start at $1 a month billed yearly and add custom domains and reply from alias.
Does Email Monster offer a newsletter digest like Addy.io?
Addy.io has no newsletter digest feature. Email Monster bundles newsletters into a single weekly or daily digest email, which is not something Addy.io offers on any plan.
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No credit card required. Unlimited aliases on your own subdomain.