SendGrid

SendGrid (now Twilio SendGrid) is one of the original transactional email APIs. The platform is established and SDKs cover every major language, but legacy API ergonomics, removal of the permanent free tier in May 2025, and aggressive upsells frustrate developers used to newer providers.

Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.

Against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, SendGrid covers scheduling, event stream, the suppressions API, and multi-tenant support, and does not cover operating track record and best published rate per 1,000. Whether that gap matters depends on how central those are to the build.

• Scheduling: Yes
• Event stream: Yes
• Deliverability: Established delivery infrastructure, but shared-IP reputation can vary and the product is broader than pure transactional delivery.
• Operating since: 2009
• Suppressions API: Yes
• Best published rate per 1,000: $0.40
• Multi-tenant: Yes
• Free tier: 60-day free trial only (permanent free tier was removed May 2025)
• Starts at: $19.95/mo for 50,000 emails

Established delivery infrastructure, but shared-IP reputation can vary and the product is broader than pure transactional delivery.

Enterprises that want a single Twilio-backed vendor for email and SMS.

Indie hackers needing a free tier; teams that value modern API ergonomics.