Email is still the highest-ROI marketing channel for startups in 2026. The average return is $36 for every $1 spent, higher than any other channel. The best part? Most leading email marketing tools have free plans generous enough to launch and scale your first 1,000-2,500 subscribers without paying anything.
This guide ranks the 15 best email marketing tools with free plans for startups in 2026, plus the verified email marketing deals available on SaaSOffers.
How We Ranked These Tools
Each tool was evaluated on:
- Free tier limit (subscribers, emails/month, features)
- Deliverability (the most important metric, does email actually reach the inbox?)
- Features included on free plan (automation, templates, segmentation)
- Upgrade path (how reasonable is paid pricing when you outgrow free?)
- Startup deal availability
The 15 Best Email Marketing Tools With Free Plans
1. Beehiiv (Best for Newsletters)
The newsletter platform that has rapidly become the favorite of indie creators and B2B newsletters.
- Free plan: Up to 2,500 subscribers, unlimited sends, custom domain, ad network access
- Best for: Newsletter-focused startups, content businesses
- Why it wins: Most generous free tier, monetization built in, beautiful editor
- Upgrade pricing: $39/month for 10K subscribers
Beehiiv, one of the tools in this guide.
2. ConvertKit Free
The classic creator email tool, with a solid free plan.
- Free plan: Up to 10,000 subscribers, broadcast emails, basic forms
- Best for: Creators, course builders, content-driven startups
- Why it ranks high: Free up to 10K subscribers (very generous), creator-focused features
- Upgrade pricing: $25/month for 1K subscribers (Creator tier)
3. Mailchimp Free
The original email marketing tool, still useful at the entry tier.
- Free plan: Up to 500 contacts, 1,000 sends/month
- Best for: Startups just starting email marketing, brand recognition matters
- Why it ranks here: Most recognized brand, extensive integrations
- Upgrade pricing: $13/month for Essentials tier
Mailchimp, one of the tools in this guide.
4. MailerLite Free
A clean, affordable alternative with a strong free tier.
- Free plan: Up to 1,000 subscribers, 12,000 emails/month, automation
- Best for: Small businesses and creators wanting simplicity
- Why it ranks here: Free automation (rare on free plans), great UX
5. Brevo (formerly Sendinblue)
European email tool with both marketing and transactional sending.
- Free plan: Unlimited contacts, 300 emails/day
- Best for: Transactional + marketing email in one tool
- Why it ranks here: Unique unlimited contacts free tier
- Startup deal: Brevo on SaaSOffers
Brevo, one of the tools in this guide.
6. Loops
Modern email marketing built for SaaS startups specifically.
- Free plan: Up to 1,000 contacts, basic automation
- Best for: B2B SaaS startups doing onboarding emails
- Why it ranks here: Built for SaaS use cases, beautiful UX
- Startup deal: Loops on SaaSOffers
7. Omnisend
Email, SMS and web push in one tool, built for online stores.
- Free plan: 250 contacts, 500 emails/month, 500 web push notifications/month, with Omnisend branding
- Best for: E-commerce startups on Shopify, WooCommerce or BigCommerce
- Why it ranks here: The free plan includes the same automations, segmentation and signup forms as the paid plans
- Startup deal: Omnisend on SaaSOffers
8. Resend (Best for Transactional)
The developer-first email API for transactional emails.
- Free plan: 3,000 emails/month, 100 emails/day
- Best for: Developer teams sending transactional email (password resets, receipts)
- Why it ranks here: Cleanest API, great deliverability
- Startup deal: Resend $300 credits via SaaSOffers
9. Customer.io
Behavioral email marketing for growing SaaS startups.
- Free trial: 14-day full access
- Best for: SaaS startups with complex behavioral triggers
- Startup deal: Customer.io credits via SaaSOffers
10. Klaviyo Free
The leading email tool for e-commerce startups.
- Free plan: Up to 250 contacts, 500 emails/month
- Best for: Ecommerce startups (Shopify integration is best in class)
- Why it ranks here: Most powerful e-commerce email automation
- Startup deal: Klaviyo on SaaSOffers
11. Substack
The newsletter platform that requires no setup.
- Pricing: Free to send, 10% of paid subscriptions if you monetize
- Best for: Writers and creators starting a newsletter
- Why it ranks here: Zero technical setup, built-in audience discovery
12. Buttondown
A minimal newsletter tool focused on simplicity.
- Free plan: Up to 100 subscribers
- Best for: Founders who want the simplest possible newsletter
13. Mailjet
Email API and drag-and-drop campaign editor from the Sinch group, used for both marketing and transactional email.
- Free plan: 6,000 emails/month (200/day), 1,000 contacts, with Mailjet branding
- Best for: Startups that want one tool for newsletters and app emails
- Why it ranks here: One of the few free plans that covers both marketing campaigns and a sending API
- Startup deal: Mailjet on SaaSOffers
14. EmailOctopus
Affordable email marketing built on Amazon SES.
- Free plan: Up to 2,500 subscribers, 10,000 emails/month
- Best for: Cost-conscious startups wanting AWS-grade deliverability
- Why it ranks here: Generous free tier, very low paid pricing
15. Sender
The most generous free email tier, possibly too good to be true.
- Free plan: Up to 2,500 subscribers, 15,000 emails/month
- Best for: Founders willing to try a less established brand
- Why it ranks here: Most generous free tier in the industry
Comparison Table
| Tool | Free Subscribers | Free Sends/Month | Best For | Startup Deal? |
|---|---|---|---|---|
| Beehiiv | 2,500 | Unlimited | Newsletters | Yes |
| ConvertKit | 10,000 | Unlimited | Creators | Yes |
| Mailchimp | 500 | 1,000 | General | Yes |
| MailerLite | 1,000 | 12,000 | Simple | No |
| Brevo | Unlimited | 300/day | Multi-purpose | Yes |
| Loops | 1,000 | Limited | SaaS | Yes |
| Resend | N/A (transactional) | 3,000 | Developers | Yes |
| Klaviyo | 250 | 500 | Ecommerce | Yes |
| Omnisend | 250 | 500 | Ecommerce | Yes |
| Mailjet | 1,000 | 6,000 | Marketing + API | Yes |
| EmailOctopus | 2,500 | 10,000 | Cost-conscious | No |
| Sender | 2,500 | 15,000 | Generous free | No |
| Customer.io | 14-day trial | Trial | SaaS lifecycle | Yes |
Which Should You Pick?
For a B2B SaaS startup: Loops or Customer.io (lifecycle email built-in)
For a newsletter or content business: Beehiiv (best monetization features)
For an e-commerce startup: Klaviyo (best Shopify integration) or Omnisend (email, SMS and push in one)
For a creator or course business: ConvertKit (free up to 10K subscribers)
For transactional emails (password resets, receipts): Resend, Brevo or Mailjet
For the absolute most generous free tier: Sender or ConvertKit
Frequently Asked Questions
The Bottom Line
Email marketing in 2026 is virtually free for startups under 2,500 subscribers. The best choice depends on your use case, but every option above lets you start without spending a dollar.
Software engineer and product builder with 13+ years of experience across software engineering, product development, and startup operations. Built SaaSOffers to make every startup deal discoverable and verified for founders worldwide.
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