A SendGrid alternative for apps and agents that also receive mail
SendGrid is a long-established sending platform with marketing tools on top. People look elsewhere when they want a simpler developer API, a free way to start, or inboxes their app or agent can read.
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Most people reading this already send with SendGrid. This page is about why developers start looking, when staying is the right call, and how Runearc differs. The side by side for another provider is on Runearc vs Postmark, and the other switch guides are on the alternatives index.
Why people look for an alternative
- A broad platform when you need an API. SendGrid combines transactional sending with marketing tools, which is useful if you use both and heavy if you only want to send a receipt.
- The free start. Summaries of its pricing report a move from a permanent free tier to a trial, so a side project may have no free way to keep sending [1].
- Inbound is a webhook, not an inbox. Inbound Parse posts mail to a URL you run; nothing is stored for you to read later [3].
When to stay with SendGrid
- You send marketing email and want its campaign and contact tools in the same account.
- You send at high volume and need dedicated IPs, regions or a long public track record.
- Your team already operates it and the cost of moving is higher than the cost of staying.
How Runearc differs
Runearc is currently free. The paid Runearc prices below are planned and come from our pricing page; billing is not live yet.
- Receiving is a first class feature. Mail lands in inboxes with threads, which you read over REST, IMAP or MCP, and received mail does not count against sending.
- Inboxes for agents and tests. A private
runearc.emaildomain, a blocking wait that returns one time codes and links, and a remote MCP server for AI agents. - A free start with your own domain. 3 inboxes, 3,000 emails a month and 3 custom domains, no card.
- Small and focused. No marketing suite, which also means nothing to learn if you only send and receive.
Other options
If you only send, Postmark and Amazon SES are the usual alternatives; we compare Postmark in Runearc vs Postmark. If your reason to leave is the developer experience, the Resend alternative page covers a switch that keeps your request body. For a map of the whole field by job, read the best email API for developers.
Moving from SendGrid
- Verify your domain in Runearc and add the SPF and DKIM records it shows. Keep SendGrid's records in place while you switch; the selectors differ.
- Swap the send call. Replace the SendGrid client with
POST /v1/emailsonhttps://api.runearc.com/v1and a Runearc sending key. The Emails API lists the fields. - Move inbound mail. If you use Inbound Parse, point the receiving domain's MX at Runearc and read mail from inboxes or accept signed webhooks.
- Check before real traffic. Send one message to the free deliverability test to confirm SPF, DKIM and DMARC pass.
Sources, read on November 9, 2026
- [1]SendGrid pricing: sendgrid.com/en-us/pricing
- [2]SendGrid documentation: www.twilio.com/docs/sendgrid
- [3]SendGrid, Inbound Parse webhook: www.twilio.com/docs/sendgrid/for-developers/parsing-email/setting-up-the-inbound-parse-webhook
Prices change. If something here is out of date or wrong, email hello@runearc.com and we will fix it.
Questions
Is Runearc a SendGrid replacement?
For sending app email and receiving replies, it can be. Runearc is not a marketing platform: it has no campaign builder or contact segments, so if you rely on SendGrid's marketing features, keep it for those.
Does SendGrid still have a free plan?
Third party summaries report that SendGrid replaced its permanent free tier with a time limited trial. Confirm the current terms on SendGrid's pricing page before you plan around it.
How do I receive email with SendGrid?
SendGrid's Inbound Parse webhook posts each message sent to your domain to a URL you run. It does not store mail for you to read later, so your server has to be up to receive it.
What does Runearc cost?
Runearc is free to start: 3 inboxes, 3,000 emails a month and 3 custom domains, no card. Paid plans are planned, and billing is not live yet.
Read next
- The best email API for developers depends on the jobMost roundups rank email APIs as if they did one thing. They do five. Here is how to choose by the job you have, who fits each one, and where Runearc is the wrong pick.
- A Resend alternative that takes the same request bodyResend is a polished sending API. People look elsewhere when received mail eats into the sending quota, when 30 days of data is not enough, or when they want agent and support inboxes next to app email.
- Runearc vs PostmarkPostmark has spent years earning a reputation for fast, reliable transactional email. Runearc is newer, and puts inboxes, agents and sending in one product.
Put Runearc to work
Get inboxes, sending, your own domains and MCP in one workspace. The free plan includes 3 inboxes, 3,000 emails a month and 3 custom domains, with no card.