Flowmails vs SendGrid
Enterprise transactional email platform (Twilio). This page is a side-by-side on the parts that matter when you're considering a switch — data residency, pricing, and the parts of each stack that show up in a real migration.
At a glance
Three sentence compare.
Pricing shape
SendGrid's free tier is 100 emails/day forever; paid plans start around $15 / month for 50,000 emails and scale to six-figure annual contracts at high volume. Flowmails' Base plan is $0; Pro is $9.9 / month and Enterprise is $39.9 / month.
Setup shape
SendGrid is a hosted API — sign up, verify a sender domain via DKIM, call the API or SMTP relay. Flowmails connects your domain provider over OAuth and provisions the shared mail worker, the storage and the route table for you.
Best fit
SendGrid: large teams that need its dedicated deliverability consultants, dedicated IPs, and sub-user management. Flowmails: teams that want a leaner stack with inbound mail and route tables included.
Feature matrix
SendGrid vs Flowmails, line by line.
| Feature | SendGrid | Flowmails |
|---|---|---|
| Data residency | SendGrid multi-tenant (Twilio-managed) | Flowmails' own storage, scoped by domain id |
| Inbound parse webhook | Yes | Yes |
| SMTP relay | Yes | No (REST only) |
| Dedicated IP | Yes (paid add-on) | No (Cloudflare-managed shared IPs) |
| Sub-user management | Yes | Per-account roles, per-domain API keys |
| Per-email pricing | Yes (volume tiers) | No |
Integration parity
SDK and runtime compatibility.
SendGrid ships an SMTP relay in addition to its REST API, so legacy apps can keep talking to it. Flowmails speaks HTTPS REST only — there is no SMTP relay on the Flowmails side. If you depend on SMTP for legacy clients, keep SendGrid (or a relay) for that surface.
Migrating
How to switch from SendGrid to Flowmails.
Audit which SendGrid features you actually use
If you depend on dedicated IPs, sub-user management, or the SMTP relay, map those to a Flowmails equivalent (or decide they aren't required). Flowmails is intentionally a smaller surface.
Connect the domain's provider
Flowmails provisions Email Routing on your provider's zone and picks an outbound provider per domain. Cloudflare is the routing provider we support today, so a domain on another DNS host needs its zone on a supported provider first.
Swap send traffic to the Flowmails SDK
SendGrid SDK calls map to Flowmails SDK calls. Update the auth (Flowmails API key instead of SendGrid API key), update the from-address to your verified zone, and ship. Templates port as plain HTML.
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