Mailjet vs SendGrid: Which Email API Wins in 2026?

Both of these tools bill you for emails sent, not contacts stored, and that single design choice is why picking between them is harder than it looks. Two teams with identical subscriber lists can pay wildly different amounts depending on how often they send. Mailjet and SendGrid both live on that volume axis, both handle transactional and marketing email, and both now sit inside far larger communication companies. But they aim at different users. One is a marketer-friendly European tool with a real free plan; the other is the developer default that moves email at a scale almost no competitor touches.

Mailjet, owned by Sinch, pairs a drag-and-drop campaign editor with a transactional API and leans hard on GDPR compliance and EU data residency. In February 2026 it restructured its plans and began auto-migrating legacy subscribers to new tiers, so anyone comparing old screenshots to today’s prices is looking at stale numbers. SendGrid, part of Twilio, processes more than 200 billion emails a month and carries the biggest integration library in the category. As of 2026 its web presence is folding into Twilio.com, though the Email API keeps its name. Which one fits depends on whether you value marketing tooling and a free tier, or raw scale and ecosystem reach.

The Short Version

Mailjet wins on price at low-to-mid volume, a genuinely useful free plan, and marketing features that non-developers can actually use. Its weakness is a smaller ecosystem than SendGrid and dedicated IPs locked behind high-volume plans. SendGrid wins on scale, integration breadth, and the Twilio compliance stack that clears enterprise procurement. Its weaknesses are inconsistent deliverability for new senders on shared IPs, a support reputation developers complain about often, and the 2025 removal of its permanent free tier. If you send under about 15,000 emails a month and want a campaign editor, Mailjet is usually the better and cheaper pick. If you send at high volume or need the largest integration catalog, SendGrid pulls ahead.

Mailjet: Marketing and API in One Bill

Mailjet tries to serve marketers and developers from the same account, and mostly succeeds. Its email editor supports real-time collaboration, which is unusual in this category, and it is built on MJML, the open-source responsive-email framework Mailjet itself created. On the developer side, the Send API, SMTP relay, and event webhooks cover the transactional basics without ceremony.

The free plan is the standout. It covers 6,000 emails a month capped at 200 a day, with 1,000 contacts, API and SMTP access, the email editor, and the form builder. SendGrid offers nothing comparable anymore. Paid plans stay cheap at the entry level: Starter is $9 a month for 8,000 emails and removes the daily cap, Essential is $17 a month for 15,000 emails and adds segmentation and unlimited contacts, and Premium is $27 a month for 15,000 emails with automations, landing pages, and priority support. Annual billing takes 10 percent off, and prices scale as you raise the monthly volume slider.

The honest weaknesses are real. Automations, landing pages, and advanced statistics only appear on the Premium tier, so the cheap plans are thinner than the headline price suggests. A dedicated IP is available only on plans of 100,000 emails a month and up, which pushes smaller senders onto shared infrastructure they cannot escape. Unused email credits expire at the end of each billing cycle rather than rolling over, so a quiet month is money lost. And Mailjet’s brand recognition and third-party integration count trail SendGrid’s by a wide margin.

SendGrid: Built for Scale

SendGrid is what many developers reach for by reflex, and volume is the reason. Its Email API absorbs enormous throughput, its integration library is the largest in the category, and it bundles marketing campaigns with transactional sending so both run from one platform. The v3 API is thorough, the event webhook is dependable, and the SDKs stay current across every popular language.

The Twilio relationship brings compliance certifications that larger buyers require, including SOC 2 and ISO 27001, plus HIPAA-eligible setups on higher tiers. If your product already runs SMS or verification flows through Twilio, keeping email in the same account is a practical convenience. Scale pricing is where SendGrid separates from most rivals: Essentials starts at $19.95 a month and stretches to cover up to 100,000 emails, and Pro at $89.95 a month handles up to 2.5 million emails with a dedicated IP included.

The weaknesses deserve plain language. SendGrid puts new accounts on shared IP pools by default, and placement there depends partly on the behavior of everyone else on the pool, so brand-new senders can see slower or less predictable inbox results until they build history or pay for a dedicated IP. Support quality draws frequent criticism, and sudden account suspensions after volume spikes are a recurring theme in developer forums. Removing the permanent free tier in 2025 pushed small projects toward a 60-day trial capped at 100 emails a day, which is not much runway for testing a real product.

Pricing, Head to Head

These two charge on the same axis, so the comparison is unusually clean: it comes down to how many emails you send and whether you want a free tier to start on.

Mailjet’s free plan covers 6,000 emails a month. Starter is $9 a month for 8,000 emails, Essential is $17 a month for 15,000 emails, and Premium is $27 a month for 15,000 emails with automations and a campaign builder. Annual billing saves 10 percent, and the price rises as you increase the monthly send volume. Dedicated IPs only enter the picture on plans of 100,000 emails and above.

SendGrid has no ongoing free plan, only a 60-day trial at 100 emails a day. Essentials starts at $19.95 a month and covers the range up to 100,000 emails depending on the volume you select, Pro is $89.95 a month for up to 2.5 million emails with a dedicated IP, and Premier is custom-priced for the highest tiers. Annual billing takes 25 percent off.

Deliverability and Data Residency

For transactional email, deliverability is the whole point, and neither tool hands you a guaranteed result. SendGrid gives you more levers — dedicated IPs, automated warmup, suppression management, and deliverability insights on higher plans — but the default shared-pool placement is only as good as the pool. Established senders on well-kept IPs do fine; new accounts carry more uncertainty until they earn reputation.

Mailjet’s deliverability sits in a similar place, with the same shared-IP caveat made sharper by the fact that you cannot buy a dedicated IP until the 100,000-email tier. Where Mailjet pulls ahead is data residency and compliance posture. It processes data under EU rules by default, advertises GDPR, HIPAA, and CSA credentials, and is a natural fit for European senders who need their email vendor to sit inside the same regulatory frame. According to the official GDPR overview, that framework governs how any tool touching EU personal data must operate, and a vendor built around it removes a compliance question you would otherwise have to answer yourself.

Marketing Features and Developer Experience

This is where the tools diverge most, and it should drive the decision more than price. Mailjet’s marketing side is built for people who are not engineers: a visual editor with collaboration, segmentation, dynamic content, landing pages, and automations on the Premium tier. A small marketing team can run campaigns in Mailjet without writing code, then use the same account’s API for transactional mail. That dual identity is its clearest advantage over pure API tools.

SendGrid can do marketing too, but its center of gravity is the API and the developer. The surface area is larger — transactional sending, marketing contacts, template management, statistics, suppressions, and IP management — which is more to learn but more to reach for as you grow. If you expect to add multi-channel messaging or already run Twilio SMS, SendGrid’s breadth means you will not outgrow it. If your marketing team wants to build and send campaigns without engineering help, Mailjet’s editor is the friendlier home.

Both APIs are RESTful, JSON-based, and documented well enough that a basic integration takes an afternoon. The SendGrid developer documentation is deeper because the product is larger; Mailjet’s is narrower but complete for its scope.

Who Should Choose Mailjet

Mailjet is the stronger pick if you send under roughly 15,000 emails a month, want a real free plan to start on, and need marketing campaigns and transactional email from one tool without hiring a developer to run them. It suits European businesses that value GDPR-native data handling and small marketing teams that want a collaborative editor. Read the full Mailjet review and the Mailjet pricing breakdown before committing, and note that automations and landing pages live only on the Premium tier.

Skip Mailjet if you need a dedicated IP without sending 100,000 emails a month, rely on a large third-party integration ecosystem, or expect unused credits to roll over. Its cheapest plans are thinner than the price implies.

Who Should Choose SendGrid

SendGrid is the better fit if you send high volume, want the largest integration library in the category, need SOC 2 or HIPAA-eligible configurations, or already run communications through Twilio. Its scale pricing beats Mailjet once your monthly send climbs, and its ecosystem reach is unmatched. Our SendGrid review covers the plan details and the deliverability tradeoffs in depth.

Approach SendGrid carefully if you are a brand-new sender who needs excellent placement immediately, if responsive support matters to you, or if losing the old free tier is a dealbreaker for a small project. Budget for a dedicated IP on the Pro tier if inbox placement cannot slip.

The Verdict

Choose based on who is actually sending the email. If a marketing team wants to build campaigns and your app also needs a transactional API, and your volume is modest, Mailjet does both for less money and gives you a free plan to prove it out first. If you send at scale, want the deepest integration ecosystem, or live in the Twilio world already, SendGrid is the more flexible platform and the cheaper one past the point where volume pricing takes over.

For the wider field, see our roundup of the best transactional email services, our full Mailjet review and SendGrid review. Confirm current numbers on the Mailjet pricing page and the Twilio SendGrid Email API pricing page, since email pricing shifts more often than most software.

Sources

1. Mailjet — Pricing — accessed 2026-07-21
2. Twilio SendGrid — Email API Pricing — accessed 2026-07-21
3. GDPR.eu — What is GDPR? — accessed 2026-07-21