You built your app with Vibe Studio because you wanted Flutter for web, iOS, and Android from one codebase. The platform includes a built-in code editor and AI debugger, giving you control over your Flutter project. Now you need email that works with your backend, whatever that might be.

Vibe Studio generates Flutter apps, which means you have flexibility in backend choice. Whether you are using Firebase, Supabase, a custom Node backend, or something else, your email platform needs to work via simple REST calls. SDK dependencies are less relevant when you control the backend.

This guide covers 11 email marketing tools that work well with Vibe Studio Flutter applications. I focused on platforms with clean REST APIs that work from any backend. If you are building with a different Flutter tool, check out our guides for FlutterFlow or other mobile tools.

Quick Comparison

Tool	Best For	Price at 10k Subs	API Quality	Automation
Sequenzy	SaaS with Stripe	$49/mo	Excellent	Advanced
Customer.io	Flutter SDK	$100+/mo	Good	Advanced
SendGrid	Cross-platform	$20-$90/mo	Good	Moderate
Mailgun	Developer control	$35/mo	Great	Basic
Resend	Modern API	$20/mo (volume)	Excellent	None
Postmark	Deliverability	$15/mo (volume)	Excellent	Basic
Loops	Simplicity	$79/mo	Great	Moderate
MagicBell	Notifications	$99/mo	Good	Moderate
Brevo	Budget + SMS	Free-$25/mo	Good	Moderate
AWS SES	Cost	~$1/10k emails	Basic	None
MailerLite	Beginners	Free-$50/mo	Good	Moderate

1. Sequenzy

Price: Free (100 subscribers) / $49/mo at 10,000 subscribers. Transactional emails included at no extra cost.

Flutter apps built with Vibe Studio can call Sequenzy's REST API from any backend. Unlike SDK-dependent tools, you just need HTTP calls to send emails. This works whether your backend is Firebase, Supabase, Node, Python, or anything else.

The platform was built for SaaS apps, not newsletters. The visual sequence builder creates onboarding, trial conversion, and lifecycle emails without code. The AI generates complete flows from a prompt.

Sequenzy handles both transactional emails and marketing automation. Password resets and nurture campaigns flow through the same system. One sender reputation, one dashboard.

At $49/mo for 10k subscribers, it is 55% cheaper than Mailchimp and 67% cheaper than Klaviyo. Revenue attribution connects emails to actual MRR.

Where it falls short: No push notifications. Pair with Firebase Cloud Messaging or OneSignal.

Best for: Flutter SaaS founders who want powerful automation without enterprise complexity. Indie hacker friendly.

2. Customer.io

Price: From $100/mo for up to 5,000 profiles

Customer.io has a Flutter SDK for tracking user behavior directly in your Vibe Studio app. Events flow to Customer.io and trigger multi-channel messaging.

Where it falls short: Expensive. Complex.

Best for: Mobile apps with budget for sophisticated multi-channel.

3. SendGrid

Price: Free (100 emails/day) / $20-$90/mo at scale

SendGrid works with any backend through REST API. Enterprise infrastructure for high volume.

Where it falls short: Cluttered interface.

Best for: High-volume requirements.

4. Mailgun

Price: From $35/mo

Mailgun provides developer-focused infrastructure. 99.99% uptime SLA, detailed logs.

Where it falls short: Basic marketing automation.

Best for: Technical teams wanting control.

5. Resend

Price: Free (3,000 emails/month) / $20/mo for 50,000 emails

Resend offers excellent API design. Clean endpoints, sensible error messages.

Where it falls short: No marketing automation.

Best for: Developers wanting clean transactional.

6. Postmark

Price: From $15/mo for 10,000 emails

Postmark focuses on deliverability. Critical transactional emails arrive reliably.

Where it falls short: Basic marketing features.

Best for: Transactional reliability.

7. Loops

Price: Free (1,000 contacts) / $79/mo at 10,000 subscribers

Loops offers modern, minimal email marketing. Fast setup, clean interface.

Where it falls short: Basic automation. Costs more than Sequenzy.

Best for: Simplicity-focused founders.

8. MagicBell

Price: From $99/mo

MagicBell handles in-app notifications plus email. Works with any backend.

Where it falls short: Email is secondary.

Best for: Apps needing notification center.

9. Brevo

Price: Free (300 emails/day) / $25/mo at 20,000 emails

Brevo offers email plus SMS at budget prices.

Where it falls short: Mixed deliverability.

Best for: Budget with SMS needs.

10. AWS SES

Price: $0.10 per 1,000 emails

AWS SES is cheapest for teams with expertise.

Where it falls short: No features. You manage everything.

Best for: Cost optimization with AWS skills.

11. MailerLite

Price: Free (1,000 subscribers) / ~$50/mo at 10,000

MailerLite is beginner-friendly with landing pages.

Where it falls short: Not mobile-focused.

Best for: Beginners wanting simple email.

Integration Patterns for Vibe Studio

REST API from backend

Call email APIs from your backend, not the Flutter client. Keep API keys server-side.

// Backend (Node.js example)
const express = require('express');
const app = express();

app.post('/api/subscribe', async (req, res) => {
  const { email, name } = req.body;

  await fetch('https://api.sequenzy.com/v1/subscribers', {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${process.env.SEQUENZY_API_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      email,
      attributes: { name }
    })
  });

  res.json({ success: true });
});

Backend-agnostic

Since Vibe Studio gives you Flutter without prescribing a backend, any REST-based email service works. Choose based on features, not SDK availability.

The Bottom Line

For Vibe Studio Flutter apps, Sequenzy offers the best balance: clean REST API, unified transactional and marketing, Stripe integration. Backend-agnostic means it works with any architecture.

If you want Flutter SDK integration, Customer.io has that. For pure transactional, Resend or Postmark.

See our SaaS email marketing guide for more context.

Check our guides for FlutterFlow, Rork, or a0.dev.