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Comparison · Marketing
Best email marketing tools for startups
Email is still the highest-ROI marketing channel. Pick the right tool for your stage.
Last updated May 21, 2026 · Editorial picks; no paid placement.
Who this is for
Founders sending broadcast newsletters, lifecycle emails, or transactional emails.
Best overall
ConvertKit (creators) / Customer.io (SaaS)
Best budget
Buttondown
Best for solo
Buttondown
The tools
ConvertKit (now Kit)
Free plan: Yes (up to 1k subscribers) · From Free, paid from $9/mo
Best for: Creator businesses, newsletters
Pros
- · Built for creators
- · Simple automation
- · Solid free tier
Cons
- · Less suited to e-commerce automation
- · Reporting is basic
Customer.io
Free plan: No (paid trial) · From $100/mo
Best for: SaaS lifecycle email and triggered messages
Pros
- · Powerful event-based triggers
- · Multi-channel (email, SMS, push)
Cons
- · Expensive at small scale
- · Complex setup
Resend
Free plan: Yes · From Free, paid from $20/mo
Best for: Transactional email for developers
Pros
- · Best-in-class developer experience
- · Built for transactional
- · Generous free tier
Cons
- · Not built for broadcast marketing
- · Newer (less ecosystem)
Buttondown
Free plan: Yes · From Free, paid from $9/mo
Best for: Solo newsletter authors
Pros
- · Markdown-first
- · Simple to use
- · Indie-friendly pricing
Cons
- · No advanced automation
- · Limited e-commerce integrations
Frequently asked questions
- Should I use one tool or separate broadcast and transactional?
- Separate. Broadcast (ConvertKit/Buttondown) and transactional (Resend/Postmark) are different deliverability profiles; lumping them risks both.
Editorial independence: Some marketplace links may be affiliate links. Editorial placement is not determined by commission. See our affiliate disclosure.