You shipped your app with Bolt.new because you wanted it running in the browser, no local setup, no environment headaches. The AI handled your full-stack code, you pushed to GitHub, and suddenly you have a real product. Now you need email that works just as seamlessly.

Bolt.new, built by StackBlitz, excels at browser-based development with AI assistance. The platform generates full-stack applications, handles dependencies, and creates GitHub repos you actually own. Many Bolt.new projects use Supabase for the backend, which creates natural integration patterns for email. Your email platform needs to complement this developer-friendly workflow without adding friction.

This guide covers 11 email marketing tools that integrate well with Bolt.new applications. I focused on platforms with clean APIs, solid documentation, and reasonable pricing for indie projects. If you are building with a different tool, we also have guides for Lovable, Cursor, and Replit.

Quick Comparison

Tool	Best For	Price at 10k Subs	Supabase Fit	API Quality
Sequenzy	SaaS with Stripe	$49/mo	Native integration	Excellent
Resend	React developers	$20/mo (volume)	Edge function ready	Excellent
Postmark	Deliverability	$15/mo (volume)	Edge function ready	Excellent
Loops	Simplicity	$79/mo	Good	Great
SendGrid	Enterprise scale	$20-$90/mo	Established	Good
Mailgun	Developer docs	$35/mo	Good	Great
Customer.io	Complex automation	$100+/mo	Via API	Good
Plunk	Budget/open-source	Free-$10/mo	Good	Good
AWS SES	Cost optimization	~$1/10k emails	Manual setup	Basic
Buttondown	Newsletters	Free-$29/mo	Basic	Good
Drip	Events API	$39/mo	Via API	Good

1. Sequenzy

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

Bolt.new projects often use Supabase for the backend, and Sequenzy has native Supabase integration that auto-syncs your users table to subscribers. When someone signs up through Supabase Auth, they automatically appear in Sequenzy and can enter your welcome sequence. No webhook configuration, no edge functions to write.

The platform was purpose-built for SaaS founders shipping fast, which aligns perfectly with Bolt.new's philosophy. The sequence builder handles welcome emails, onboarding drips, trial conversion campaigns, and re-engagement flows without code. The AI can generate complete sequences from a single prompt. Describe what you want, and you get a working email flow in minutes.

Beyond the Supabase integration, Sequenzy offers native Stripe OAuth that syncs MRR, LTV, and payment events automatically. If your Bolt.new project handles subscriptions, you can segment by revenue tier, churn risk, or plan type without writing custom code. The trial-to-paid sequences are particularly strong since that is what Sequenzy was designed for.

The unified platform handles both transactional emails and marketing automation in one place. Password resets, receipts, and magic links flow through the same system as your onboarding sequences and product announcements. One sender reputation, one dashboard, half the complexity.

Where it falls short: No SMS messaging, no landing page builder, smaller integration ecosystem than legacy platforms. If you need multi-channel messaging, you will need to pair Sequenzy with a push notification tool. For landing pages, Bolt.new can generate them directly.

Best for: SaaS founders building with Bolt.new and Supabase who want powerful automation without enterprise complexity. At $49/mo for 10k subscribers, it is 38% cheaper than Loops and significantly cheaper than Customer.io. The unified transactional + marketing platform eliminates the need to manage multiple tools.

2. Resend

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

Resend offers the best developer experience in transactional email. The API is a joy to work with. Clean design, predictable behavior, excellent error messages. For Bolt.new projects where developers handle the email integration directly, Resend feels natural.

The React Email library is particularly relevant since many Bolt.new projects generate React frontends. You build email templates using the same component patterns you use in your app. JSX for emails might sound strange, but it works remarkably well for maintaining consistent design systems.

Calling Resend from Supabase Edge Functions is straightforward. A few lines of code handles password resets, order confirmations, or any transactional message. The documentation is thorough, and the team is responsive. Deliverability is strong with minimal configuration. SPF, DKIM, and DMARC setup is guided and sensible.

Where it falls short: Resend is not a marketing platform. No campaigns, no segments, no automation sequences. Recent additions have brought basic audience features, but it is early. If you need onboarding sequences or trial conversion flows, you will need a second tool. Check our Sequenzy vs Resend comparison for a detailed breakdown.

Best for: Developers who need excellent transactional email and are comfortable pairing it with a separate marketing tool, or teams that only need transactional messaging.

3. Postmark

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

Postmark built its reputation on deliverability, and it shows. If getting your emails into the inbox is your primary concern, especially for time-sensitive messages like authentication codes or payment alerts, Postmark delivers consistently.

The platform separates transactional and broadcast email into different "message streams." This protects your critical transactional messages from being affected by marketing campaigns. If you send a promotional email that gets spam complaints, it does not impact your password reset delivery. For Bolt.new projects handling authentication, this separation matters.

Emails arrive within seconds, which is essential for time-sensitive content. The API is clean, documentation is comprehensive, and the 45-day message history helps with debugging. Postmark actively manages their IP reputation and removes bad actors quickly, which benefits everyone on the platform.

Where it falls short: The broadcast (marketing) features are basic. No sophisticated automation, limited segmentation. Postmark will reject you if your content does not meet their standards. This protects deliverability but limits use cases. No free tier for testing.

Best for: Bolt.new projects where transactional email reliability is critical. Consider pairing with a marketing platform for sequences and campaigns.

4. Loops

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

Loops takes the anti-complexity approach to email marketing. The interface is clean, the feature set is focused, and you can go from signup to sending your first campaign faster than almost any other tool. If enterprise marketing platforms make your eyes glaze over, Loops is refreshing.

The platform combines transactional and marketing email in one place. You get a visual automation builder, a clean email editor, and enough features to run a SaaS without drowning in options. The API is straightforward for triggering events from your Bolt.new app. Loops handles the basics well: welcome emails, product updates, re-engagement campaigns.

For Bolt.new developers who want minimal configuration and maximum speed, Loops delivers. The learning curve is minimal. Most founders get their first sequence running within an hour of signup.

Where it falls short: Automation capabilities are basic compared to Customer.io or Sequenzy. If you need complex workflows based on product behavior, you will hit limits. At $79/mo for 10k subscribers, it costs more than Sequenzy ($49/mo) for similar core functionality.

Best for: Founders who prioritize simplicity and speed over sophisticated automation features.

5. SendGrid

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

SendGrid is the established enterprise option, battle-tested at scale. Now owned by Twilio, the platform handles massive email volumes reliably. If your Bolt.new project might scale beyond 100,000 emails monthly, SendGrid's infrastructure is proven.

The platform offers both transactional email API and Marketing Campaigns for newsletters and automation. You get dedicated IP addresses when you need them, which helps with deliverability at high volume. The documentation is comprehensive, and the platform handles authentication setup well.

Bolt.new projects that expect enterprise scale eventually benefit from SendGrid's reliability. The Marketing Campaigns feature adds drag-and-drop design, automation, and segmentation. It is not as sophisticated as specialized SaaS tools, but it covers the basics.

Where it falls short: The interface is cluttered and can feel overwhelming. Marketing features lag behind specialized platforms. Pricing gets expensive at scale. Not SaaS-specific, so no native Stripe integration or behavioral automation.

Best for: Teams expecting high volume who need established infrastructure and the security of Twilio backing.

6. Mailgun

Price: From $35/mo

Mailgun focuses on developers who want control over their email infrastructure. The platform offers a 99.99% uptime SLA and claims capacity for 15 million emails per hour. For Bolt.new projects with technical teams, Mailgun provides the flexibility to customize everything.

The API is solid, documentation is thorough, and you get features like email validation, deliverability tracking, and detailed analytics. Mailgun handles both transactional and basic marketing use cases. The platform works well with Supabase Edge Functions for sending programmatic email.

Where it falls short: Less polished than Resend or Postmark for the developer experience. Marketing automation is basic. The pricing model can get confusing with add-ons for features like email validation.

Best for: Technical teams who want flexibility and do not mind configuring details themselves.

7. Customer.io

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

Customer.io is the sophisticated automation platform for teams that need complex behavioral messaging. If your customer journey has dozens of branches, multiple channels, and conditional logic, Customer.io can handle it.

The visual workflow builder is genuinely powerful. You can create branching logic, A/B tests within workflows, and time-delayed sequences based on user behavior. The event API tracks what users do in your Bolt.new app, then triggers messaging across email, push, SMS, and in-app notifications.

Multi-channel capability is where Customer.io shines. Everything shares the same customer data, so messaging stays consistent. When a user does something in your app, you can respond through whatever channel makes sense.

Where it falls short: Starting at $100/mo, Customer.io costs significantly more than alternatives. The learning curve is steep. Transactional email requires their separate Journeys product with additional pricing. For most Bolt.new projects, especially early-stage, this is overkill.

Best for: Established SaaS with dedicated marketing teams and genuinely complex customer journeys.

8. Plunk

Price: Free (3,000 emails/month) / ~$10/mo for more

Plunk is the open-source option for budget-conscious developers. The platform is self-hostable for full control, or use their managed version for minimal cost. At roughly $0.001 per email at scale, it is among the cheapest options available.

For Bolt.new projects where you need basic transactional email without premium pricing, Plunk works well. The API is straightforward, and you get basic automation features. The open-source nature means you can inspect the code and host it yourself if privacy matters.

Where it falls short: Fewer features than commercial alternatives. The managed platform is smaller with less track record. If you need sophisticated automation, you will outgrow Plunk quickly.

Best for: Bootstrapped developers minimizing costs who do not mind a simpler feature set.

9. AWS SES

Price: $0.10 per 1,000 emails / 62,000 free monthly on EC2

AWS SES is the cost optimization choice for teams comfortable with AWS infrastructure. At $0.10 per thousand emails, sending 300,000 monthly costs about $30. If you run on EC2, you get 62,000 free emails monthly.

The catch is that SES is infrastructure, not a product. You get raw sending capability without the dashboard, templates, or automation that other platforms provide. You need to handle bounce processing, complaint tracking, and reputation management yourself. For Bolt.new projects with AWS expertise, SES can dramatically reduce email costs.

Where it falls short: No marketing features. No visual builder. You manage deliverability yourself. Setup is more complex than plug-and-play alternatives. Not recommended unless you have AWS experience.

Best for: Teams with AWS expertise who want to minimize costs and can handle the infrastructure complexity.

10. Buttondown

Price: Free (100 subscribers) / $29/mo at 10,000

Buttondown is the developer-friendly newsletter platform. Markdown support, solid API, privacy focus. If your Bolt.new project includes a newsletter component, Buttondown handles it elegantly without enterprise bloat.

The interface is minimal and stays out of your way. Write in Markdown, send to your list, track opens if you want to. No elaborate automation, just focused newsletter functionality. The API integrates subscriber management into your app cleanly.

Where it falls short: Not designed for product email or behavioral automation. No transactional email support. If you need onboarding sequences or trial conversion campaigns, Buttondown is not the right tool.

Best for: Developers running newsletters alongside their SaaS, not as the primary email platform.

11. Drip

Price: From $39/mo

Drip started in e-commerce but has evolved to support SaaS use cases. The custom events API is solid, letting you trigger automations based on what users do in your Bolt.new app. Revenue tracking connects email campaigns to actual purchases.

The visual workflow builder is capable, and Drip handles segmentation based on user behavior. If you need to track events like "user completed onboarding" or "user used feature X" and trigger emails accordingly, Drip supports it.

Where it falls short: E-commerce heritage shows in the feature focus. Pricing is not the cheapest. For pure SaaS use cases, purpose-built tools like Sequenzy offer more relevant features.

Best for: Bolt.new projects with e-commerce components, or SaaS that needs solid event-based automation at reasonable cost.

How to Choose

If you are just validating

Start with free tiers. Sequenzy offers 100 subscribers free with full functionality. Loops gives you 1,000 contacts. Resend handles 3,000 emails monthly. Pick based on which integration pattern matches your Bolt.new project. If you are using Supabase, Sequenzy's native integration is worth testing.

If you need transactional immediately

Postmark or Resend for pure transactional with excellent deliverability. Both work seamlessly with Supabase Edge Functions. If you want marketing automation included, Sequenzy handles both in one platform.

If you are building product-led growth

Sequenzy or Customer.io for behavioral triggers. You need emails based on what users do, not just signup dates. Product-led growth email strategies require tracking user behavior and responding automatically. Sequenzy's Supabase integration makes this straightforward.

If budget is tight

Plunk is open-source and cheap. AWS SES costs almost nothing if you have the expertise. Brevo's free tier handles 300 emails daily. For indie hackers, EmailOctopus gives you 2,500 subscribers free.

Integration Patterns for Bolt.new

Supabase Edge Functions

Bolt.new projects commonly use Supabase, which provides Edge Functions for server-side logic. Any email API can be called from an edge function. When a user signs up, completes an action, or triggers an event, the function sends the appropriate email or updates the subscriber record.

// Example: Calling Sequenzy from Supabase Edge Function
const response = await fetch('https://api.sequenzy.com/v1/subscribers', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${Deno.env.get('SEQUENZY_API_KEY')}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    email: user.email,
    attributes: { name: user.name, plan: 'free' }
  })
});

Database webhooks

Supabase can trigger webhooks when database records change. Set up a webhook to call your email platform when users hit milestones, change plans, or become inactive. This pattern decouples email logic from your main application code.

Stripe webhooks for payment events

If your Bolt.new project uses Stripe, payment webhooks trigger email actions automatically. Successful charges send receipts. Failed payments start dunning sequences. Subscription changes update segments. Sequenzy handles this natively through OAuth. Other platforms need a webhook handler translating Stripe events to email triggers.

Direct API integration

For Bolt.new projects with custom backends, direct API calls work with every email platform. Track events in your app, then POST to your email platform's API to trigger sequences or send transactional messages.

The Bottom Line

For most Bolt.new projects, Sequenzy makes sense if you are building SaaS with Supabase and Stripe. The native integrations eliminate boilerplate, the unified platform handles both transactional and marketing, and the visual sequence builder matches Bolt.new's rapid development approach.

If you need pure transactional email with excellent developer experience, Resend or Postmark excel. If simplicity matters most and you do not need deep integrations, Loops gets you running quickly. For enterprise scale with established infrastructure, SendGrid is battle-tested.

Pick something that matches your current stage. You are building with Bolt.new because you want to move fast. Your email platform should support that speed, not slow you down with configuration overhead. For more context on email tools for SaaS, see our comprehensive SaaS email marketing guide.

Using a different vibe-coding tool? Check out our guides for Base44, v0, or Cursor projects.