How is SegMailer different from Customer.io?

Same core capabilities (real-time segments, visual workflows, REST API), roughly 3× cheaper at every tier, and you never need to set up a separate email delivery provider. Customer.io is built for enterprise teams; SegMailer is built for founders.

How is it different from Loops.so?

Loops is great. We're positioned a bit differently: more flexible pricing tiers for teams scaling from $1K to $50K MRR, multi-workspace support for agencies, and we don't require separate email infrastructure. Pick what fits your stage.

Do I need to connect AWS SES, SendGrid, or Mailgun?

No. SegMailer handles all email delivery infrastructure. You just verify your sending domain (DKIM, SPF, DMARC) and start sending.

Can I push contact data from my app?

Yes. Our REST API lets you create, update, and delete contacts in real time. When attributes change, your segments re-evaluate and active workflows adjust automatically.

What kind of campaigns can I build?

Multi-step workflows triggered by segment entry, manual launch, or schedule. Add wait steps, if/else branches, and conversion goals. Most SaaS founders use us for onboarding, trial-to-paid, churn prevention, and re-engagement.

Is there really a free plan?

Yes. Free forever up to 500 contacts and 1,000 emails per month. No credit card required. Perfect for founders testing product-market fit.

How does deliverability work?

We manage sending infrastructure, IP reputation, and deliverability optimization. You'll set up DKIM, SPF, and DMARC for your sending domain. We walk you through it and validate each record automatically.

Can I track conversions, not just opens and clicks?

Yes. Set a conversion goal per campaign (e.g., 'user upgrades to paid'). SegMailer tracks who converts, when, and calculates your real conversion rate. Contacts who convert automatically stop receiving further emails in that campaign.

Built for bootstrapped SaaS founders

Lifecycle email that
actually converts.

SegMailer is the simple Customer.io alternative for bootstrapped SaaS. Real-time segments, visual workflows, and a clean API. Starting at $29/mo instead of $100+.

Start free →See how we compare to Customer.io

Free forever up to 500 contacts · No credit card · Setup in 15 minutes

app.segmailer.com/segments/active-pro-users

Active Pro Users

LiveReal-time segment · Updates automatically

2,847

Matching contacts

Segment rules

Whereplanis"Pro"

Andlast_activewithin7 days

Andemail_verifiedistrue

This segment feeds into

Onboarding Campaign · Weekly Digest · Upgrade Nudge

View campaigns →

Running in production across our own SaaS products. Now open to yours.

Own products

running SegMailer in production

< 1s

Segment update

end-to-end, p99 latency

$29/mo

Entry tier

vs. $100/mo Customer.io minimum

500

Free contacts

no credit card, forever

How it works

From signup to sent in 15 minutes.

No engineering team. No delivery provider setup. Just push your user data and ship your first campaign.

Push your users to SegMailer

Add contacts via CSV, or connect your app with a single API call. We handle deduplication and sync in real time.

Build segments with plain-English rules

Define audiences like 'Pro users who haven't logged in for 7 days' with AND/OR logic. Segments update automatically as user data changes.

Ship automated campaigns that convert

Design multi-step workflows with visual branching. Track opens, clicks, and conversions in real time.

Real-time segments

Segments that think in real time.

Your segments live inside your data, not on top of it. A user upgrades, and they enter the Pro segment within seconds. They go dormant, and they enter your re-engagement campaign automatically. No cron jobs. No stale audiences. No manual list refreshes.

Learn more →

app.segmailer.com/segments/at-risk

At-Risk Paying Customers

Live

412

Contacts

Whereplan!="Free"

Andlast_loginmore than14 days ago

Andsupport_tickets≥1

app.segmailer.com/campaigns/onboarding

Onboarding workflow

Live

Trigger

User signs up

Wait

2 hours

Send

Welcome email

If / Else

Opened email?

Yes →

Send: Getting started

← No

Send: Re-engagement

Visual workflows

Automate sequences you can see.

Build multi-step email campaigns on a visual canvas. Add delays, if/else branches, and conversion goals. Preview the whole flow before going live. No YAML files. No code.

See pricing →

Developer-friendly API

One API call. Segments update everywhere.

Sync user data from your app with a clean REST API. Your segments re-evaluate instantly and active workflows adjust automatically.

POST /api/v2/contacts

await fetch('https://api.segmailer.com/api/v2/contacts', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${API_KEY}`
  },
  body: JSON.stringify({
    identifier: {
      email: 'user@example.com'
    },
    attributes: {
      firstName: 'Jane',
      lastName: 'Doe',
      plan: 'premium',
      signupDate: '2024-01-15'
    }
  })
})

// → Segments re-evaluate within 1s
// → Active workflows adjust automatically

That's the entire integration. No SDK. No webhooks to configure.

How we compare

Same power. 3× less.

Built for your stage, not a 50-person marketing team.

	Recommended SegMailer	Customer.io	Loops	Mailchimp
Starting price	$29/mo	$100/mo	$49/mo	$13/mo
Real-time segmentation	✓	✓	✓	No
Visual workflows	✓	✓	✓	Limited
REST API	✓	✓	✓	Limited
Built-in delivery (no SES)	✓	No	✓	✓
Conversion tracking	✓	✓	✓	Limited
Multi-workspace	✓	Enterprise	No	No

Pricing reflects each provider's entry-level paid plan at comparable contact volumes.

Recommended

SegMailer

$29/mo

Real-time segmentation: ✓
Visual workflows: ✓
REST API: ✓
Built-in delivery (no SES): ✓
Conversion tracking: ✓
Multi-workspace: ✓

Customer.io

$100/mo

Real-time segmentation: ✓
Visual workflows: ✓
REST API: ✓
Built-in delivery (no SES): No
Conversion tracking: ✓
Multi-workspace: Enterprise

Loops

$49/mo

Real-time segmentation: ✓
Visual workflows: ✓
REST API: ✓
Built-in delivery (no SES): ✓
Conversion tracking: ✓
Multi-workspace: No

Mailchimp

$13/mo

Real-time segmentation: No
Visual workflows: Limited
REST API: Limited
Built-in delivery (no SES): ✓
Conversion tracking: Limited
Multi-workspace: No

Pricing reflects each provider's entry-level paid plan at comparable contact volumes.

Use cases

Lifecycle emails that pay for themselves.

User Onboarding

Welcome sequences that adapt to what users actually do. Trigger emails when users complete actions or skip steps.

Trial-to-Paid

Segment trial users by engagement, not just days remaining. Send targeted upgrade nudges based on real behavior.

Churn Prevention

Detect at-risk users through declining activity. Trigger win-back campaigns before they cancel.

Product Announcements

Ship updates to the right audience. Segment by plan, usage, or role so announcements land with relevance.

Upsell & Cross-sell

Surface upgrade offers when users hit plan limits. Deliver tailored prompts based on usage patterns.

Re-engagement

Win back dormant users with multi-step workflows that escalate gradually with personalized offers.

From the founder

“I built SegMailer because I kept hitting the same wall.”

Every bootstrapped SaaS I worked on ran into the same problem: Mailchimp couldn't handle behavioral logic, Customer.io cost more than most indie SaaS makes in a month, and nobody wants to duct-tape Resend with cron jobs.

So I built the thing I wished existed: behavioral email that doesn't require a marketing team or a Series A.

If you're a founder between $1K and $50K MRR trying to figure out lifecycle emails, I'd love to hear from you.

Kevin Vaghasiya

Founder, SegMailer · Built with the team at BaruzoTech

kevin@segmailer.com

Pricing

Start free. Scale as you grow.

No seat-based pricing. No overage traps. Cancel anytime.

Free

For founders testing product-market fit.

$0/month

// no Customer.io equivalent

500 contacts
1,000 emails/month
Smart segments (AND/OR)
Visual workflow builder
Drag & drop email editor
Basic campaign analytics

Start free

Starter

For early-stage SaaS shipping first campaigns.

$29/month

// Customer.io equivalent: $100/mo

5,000 contacts
10,000 emails/month
Unlimited smart segments
Conversion goal tracking
3 team members
Full REST API access

Choose Starter

Growth

For scaling SaaS running lifecycle campaigns.

$59/month

// Customer.io equivalent: $200/mo

25,000 contacts
50,000 emails/month
Unlimited campaigns & workflows
Advanced analytics & reporting
10 team members
Priority email support

Choose Growth

Pro

For established SaaS with large user bases.

$119/month

// Customer.io equivalent: $500/mo

100,000 contacts
200,000 emails/month
Unlimited everything
Dedicated IP (optional)
Unlimited team members
Premium support & onboarding

Choose Pro

Questions

Frequently asked questions.

Same core capabilities (real-time segments, visual workflows, REST API), roughly 3× cheaper at every tier, and you never need to set up a separate email delivery provider. Customer.io is built for enterprise teams; SegMailer is built for founders.

Ship lifecycle emails in 15 minutes.

Start free. No credit card. No engineering team required.

Start free →

Free forever up to 500 contacts · Upgrade when you're ready