# 5 best email marketing tools for SaaS startups in 2026

Canonical: https://brew.new/blog/best-email-marketing-tools-for-saas-startups
Author: Philip Sørensen
Published: 2026-10-20
Updated: 2026-10-20

Brew publishes this comparison. We reviewed the linked product documentation on October 16, 2026; this is a documentation comparison, not a claim of hands-on testing of every platform. Check current plan limits on the vendor's pricing page.

You're about to announce a feature your team spent a month building, and the launch email is still sitting in a doc. The copy is mostly there, the screenshot needs replacing, and the only person who knows how to fix the template is busy shipping the release.

A small SaaS team needs an email platform that helps with the work before anyone hits send. You need campaigns without borrowing a designer for every change, and onboarding emails that react to what users do in the product.

Brew is our first pick for teams with both needs. Its agent builds your brand from your website, designs finished emails, sends them and runs the automations, from the app or from Claude, Cursor or your own code. ActiveCampaign, Loops, Customer.io and HubSpot come up if you need other channels or a tighter link to a sales CRM.

## The tools at a glance

| Rank | Tool | Who we would recommend it to | Entry pricing |
| --- | --- | --- | --- |
| 1 | Brew | Small teams that need finished, on-brand campaigns and lifecycle emails | Free plan; Growth $99/mo |
| 2 | ActiveCampaign | Teams building marketing automation around site and event tracking | Event triggers on Plus and above |
| 3 | Loops | Teams that write their own emails and want one SaaS email tool | Free up to 1,000 contacts; paid by contacts |
| 4 | Customer.io | Teams coordinating email with push, SMS and in-app messages | Priced by profiles |
| 5 | HubSpot | Startups whose marketing and sales work from one CRM | Priced by HubSpot hub and seats |

## 1. Brew: an agent that finishes the email

[Brew](/startups) is fully agentic. Paste your URL and Brew builds your email design system from your site: colors, type, logos and voice. Then you describe the email, and the agent designs it on brand, sends it from your domain and builds the automation that follows. The same actions are available over [MCP](/mcp), a REST API, a typed SDK and a CLI, so a developer can wire the product events while someone else writes the campaign.

Sign-ups, subscriptions and your own events start lifecycle emails. Brew connects to [Stripe](/browse/integrations/stripe), [Clerk](/browse/integrations/clerk), [Supabase](/browse/integrations/supabase) and Slack, and your backend can fire any custom event.

Bridge moved from Customer.io to Brew and had its onboarding flow live the next day. Every new trial now gets a five-email sequence the founder built from a prompt. See the [Bridge story](/customers/bridge). LiveFlow, which moved from Loops and Customer.io, says emails that took hours now take minutes ([LiveFlow story](/customers/liveflow)).

Brew has a free plan. Growth costs $99 a month with 50,000 sends and 10,000 AI credits. Credits and sends have separate monthly limits, so estimate both. See [pricing](/pricing).

Start with the feature announcement that's been waiting. Ask for the draft, request the changes your team would normally make, and check whether the colors, type and tone still match your product.

## 2. ActiveCampaign: automation built on event tracking

ActiveCampaign combines marketing automation with site and event tracking. Your application posts an event, and the ["Event is recorded" trigger](https://help.activecampaign.com/hc/en-us/articles/218788707-Automation-triggers-explained) can start an automation, with [If/Else](https://help.activecampaign.com/hc/en-us/articles/218251828-Automation-actions-explained) branches after it. Both the event trigger and If/Else are on the Plus, Pro and Enterprise plans, not Starter.

Emails are built in ActiveCampaign's editor. In a trial, walk a test account from trial to paid and check what happens to emails already waiting to send.

Choose it if you need its CRM deal pipelines next to email and have someone to build each email.

See how it compares: [Brew vs ActiveCampaign](/compare/brew-vs-activecampaign).

## 3. Loops: one SaaS email tool, emails written by you

[Loops](https://loops.so/pricing) puts marketing and transactional email in one place for software companies. Paid plans are priced by subscribed contacts, with transactional sending included. Coding agents can set it up through its [MCP server](https://loops.so/docs/mcp-server), CLI and skills.

Loops gives you an editor with themes and components, and you write and lay out each email yourself. If you already use Loops, write down what makes the work slow before you replace it. Slow design changes are a different problem from missing product data.

Choose it if your readers choose between several mailing lists in a preference center, or you want Supabase Auth email from the same tool.

See how it compares: [Brew vs Loops](/compare/brew-vs-loops).

## 4. Customer.io: journeys across several channels

[Customer.io](https://customer.io/) sends email, push, SMS and in-app messages, with [branches](https://docs.customer.io/journeys/branches/) and [wait-until steps](https://docs.customer.io/journeys/wait-until/) in its workflow builder. Someone who already saw an in-app explanation can get a different follow-up email.

Someone also has to design the data model and keep events flowing, and emails are designed in its Design Studio. Our [Customer.io alternatives guide](/blog/best-customerio-alternatives-for-small-saas-teams) covers what a small team gives up by moving.

Choose it if your onboarding needs push, SMS or in-app messages next to email.

See how it compares: [Brew vs Customer.io](/compare/brew-vs-customerio).

## 5. HubSpot: email inside the CRM

HubSpot's [email tools](https://www.hubspot.com/products/marketing/email) are integrated with its CRM, so campaigns sit next to the records your sales team keeps.

Test a real handoff, such as a trial user who asks for a demo after a campaign. If email is your only reason to buy HubSpot, price the full subscription that process requires before you commit.

Choose it if your sales team already works from HubSpot's CRM.

See how it compares: [Brew vs HubSpot](/compare/brew-vs-hubspot).

## Choose with a real week of work

Ask the person who will run email to build one real campaign and a small onboarding flow in your top two tools. Have them revise the campaign after feedback, then follow a test user through the flow. Write down every task that still needed a developer or designer, because that time adds up long after the trial ends.

For the flow itself, [how to build a SaaS trial-conversion sequence](/blog/how-to-build-a-saas-trial-conversion-email-sequence-with-product-events) walks through the events and checks.

## Frequently asked questions

### What should a SaaS startup send first?

A welcome email on signup, then a short onboarding sequence that stops once the user reaches the first useful outcome. Launch emails and a monthly update come next.

### Can one tool send product email and marketing email?

Brew, Loops and Customer.io all send both. In Brew, receipts and other transactional email go out from a domain set up for transactional sending, and campaigns use a marketing domain with one-click unsubscribe. [Transactional emails](/blog/transactional-emails) explains the split.

### Does Brew send Supabase Auth emails?

No. Brew's Supabase integration starts automations from changes to `auth.users`, such as a confirmed email. Confirmation, magic-link and password-reset emails stay on Supabase's SMTP provider.