You’ve been searching for a free email marketing platform that doesn’t cut you off at 250 or 500 contacts, and you’re discovering that most “free forever” tools quietly cap your list before you’ve sent your first campaign. Here’s the honest situation: no email marketing platform lets you store unlimited contacts AND send unlimited emails at zero cost — that would eat their server costs and destroy deliverability for paying customers. But two major platforms let you store unlimited contacts for free while capping your monthly send volume, and one lets you send to 10,000 subscribers with no send cap at all. Understanding which of these models fits your actual use case is the whole decision, and I’m going to give you a straight answer with real July 2026 numbers.
Key Takeaways
Brevo’s free plan has genuinely unlimited contact storage — but caps sends at 300 emails per day (about 9,000 per month). For a business with a large list that emails infrequently, this is the closest thing to a truly unlimited free plan available in email marketing.
Kit’s free Newsletter plan lets you send unlimited emails to up to 10,000 subscribers — no daily send cap, no monthly send cap. That combination of a high subscriber ceiling and unlimited sends makes it the most practical free plan for a growing newsletter or content creator.
“No subscriber limit” on email marketing free tiers always comes with a send cap. Any platform claiming otherwise is either pricing by sends instead of contacts (like Brevo and Mailjet), or capping your sends in a way that effectively limits how many subscribers you can realistically email.
Sender’s free plan at 2,500 subscribers and 15,000 monthly sends is the most generous mid-tier free option — outperforming Mailchimp’s 2026 free tier (250 contacts, 500 sends) by an enormous margin at zero cost.
What “No Subscriber Limit” Actually Means
Before diving into tools, it’s worth clarifying what this term means in practice, because it’s marketed inconsistently across the industry. There are two versions of “no subscriber limit” in email marketing:
Version 1 — Unlimited Contact Storage (Send-Capped)
Brevo and Mailjet both let you store an unlimited number of contacts in your account for free. You can import 50,000 email addresses into either platform without hitting a paywall. The catch is you can only send a fixed number of emails per day or month — Brevo caps daily sends at 300 on the free tier, Mailjet at 200. So “unlimited subscribers” is accurate, but “unlimited email to those subscribers” is not.
This model makes the most sense for businesses with large lists that email infrequently — say, a local business with 5,000 past customers they contact once or twice a month for promotions.
Version 2 — High Subscriber Cap With Unlimited Sends
Kit’s free Newsletter plan takes the opposite approach: it caps subscribers at 10,000 but puts no limit on how many emails you can send to that list. You can email your 10,000 subscribers once a week, twice a week, every day — no monthly send counter tracking against you.
This model makes more sense for a newsletter operator or content creator building an audience they communicate with regularly.
The Honest Truth Most Articles Skip
The original observation worth stating clearly: a completely free, truly unlimited email marketing tool — unlimited contacts, unlimited sends, no branding — does not exist and never will. Every platform monetizes on volume, whether that’s contact count, send volume, or feature access. The question isn’t “which one is unlimited?” but “which limitation fits my actual behavior?” If you email rarely, contact-unlimited is more valuable. If you email frequently, send-unlimited matters more.
Best Overall — Brevo (Formerly Sendinblue)
Brevo’s free plan is the best free email marketing tool for businesses that want to store a large contact list without paying for it, while keeping send volume moderate. Unlimited contacts, 300 emails per day (approximately 9,000 per month), basic automation, and a functional email builder are all included at zero cost with no credit card required.
What the Free Plan Actually Covers
The free tier includes unlimited contact storage, 300 daily email sends, a drag-and-drop email editor, basic email templates, transactional email support, and SMS marketing access at per-send rates. For a business with 8,000 contacts sending one newsletter a month, Brevo’s free plan covers that exact use case at $0 — whereas Mailchimp Standard would charge roughly $135/month for the same contact count. That’s the gap that makes Brevo’s “unlimited contacts” model so significant for certain business profiles.
The Send Cap In Practice
The 300-emails-per-day limit sounds small until you do the math: 300 per day × 30 days = 9,000 monthly sends. A business with 1,000 active contacts sending weekly (4 campaigns × 1,000 = 4,000 monthly sends) fits comfortably within that cap. A business with 5,000 contacts sending a monthly newsletter (5,000 sends total) also fits within 9,000/month. Where it breaks: a business with 10,000 contacts sending weekly (40,000 monthly sends) burns through the free tier within 10 days of the month. In that case, Brevo’s Starter plan at $25/month for 20,000 sends is the natural upgrade.
Where Brevo Falls Short
Brevo’s free plan has no multi-step marketing automation — triggered sequences (like a welcome email series that fires automatically when someone joins your list) require the Business tier at $65/month. It also lacks A/B testing on the free tier. The interface is clean but slightly less polished than MailerLite for visual email building. And Brevo’s deliverability on shared free sending infrastructure can be inconsistent compared to paid plans that use dedicated IP pools.
Best for Unlimited Sends — Kit (Formerly ConvertKit)
Kit’s free Newsletter plan is the best free option if what you actually care about is sending unlimited emails to your subscribers without a monthly send counter. Up to 10,000 subscribers, unlimited sends, unlimited landing pages and forms, at no cost. No daily cap. No monthly limit. Just a 10,000-subscriber ceiling and a single automation sequence.
Why This Model Wins for Active Emailers
A newsletter operator sending three emails a week to 5,000 subscribers generates 60,000+ monthly sends. On Brevo’s free tier (9,000 sends/month), that’s impossible. On Mailchimp (250 contacts on the free tier), it’s laughable. On Kit’s free Newsletter plan, it’s completely covered at no cost — and Kit’s infrastructure is built for high-frequency newsletter sending at scale. That’s the use case it was designed for, and the free plan reflects that.
The One Automation Limitation
Kit’s free tier includes only one visual automation (a series of triggered emails that fire based on subscriber behavior, like a 5-email welcome sequence). One well-built welcome sequence covers the most important automation for a growing list, but if you want multiple simultaneous automations — a welcome series, a re-engagement sequence, and a product launch sequence running at the same time — you need Kit’s Creator plan at $39/month (or $33/month annually) for 1,000 subscribers. That price jump is worth noting for anyone planning multiple complex automation flows from day one.
Best for Large Send Volume — Mailjet
Mailjet’s free plan offers unlimited contact storage with 6,000 monthly sends (200 emails per day) — slightly less than Brevo’s 9,000/month limit but with one key difference: Mailjet’s free tier includes more advanced segmentation tools and better template customization than Brevo’s free offering. For businesses that care about personalization and segmentation on a free plan, Mailjet is worth a closer look.
What You Get Free on Mailjet
Unlimited contacts, 6,000 emails/month, advanced contact segmentation, a responsive email template builder, multi-language support, and real-time tracking of opens, clicks, and bounces. Mailjet also has a strong transactional email API for businesses sending automated emails triggered by website actions (like order confirmations or password resets) — which is a legitimate use case for small ecommerce or SaaS businesses that can’t afford dedicated transactional email services yet.
Where Mailjet Falls Short
Mailjet’s marketing automation is extremely limited on the free plan — basic autoresponders only, no visual workflow builder. For pure newsletter sending, its email builder is functional but less intuitive than MailerLite or Kit. Customer support on the free tier is limited to documentation, with no live chat or email support access. And at 200 emails/day, the send cap is tighter than Brevo’s 300/day, which matters for businesses doing regular campaign sends to larger lists.
Best Mid-Tier Free Option — Sender
Sender’s free plan is the best balance of contact count and send volume at zero cost for a business that’s outgrown Mailchimp’s 250-contact ceiling but isn’t ready to pay for anything. It includes 2,500 subscribers and 15,000 monthly sends — sixty times Mailchimp’s monthly send limit on the 2026 free tier — with basic automation, responsive templates, and email analytics included.
Who Sender Works For
A small service business or early-stage startup with a list of 500-2,000 contacts sending weekly emails (2,000 subscribers × 4 campaigns = 8,000 monthly sends) operates entirely within Sender’s free tier without hitting any limit. The 15,000 monthly send limit is generous enough for most businesses in their first 12-18 months of email marketing before their list outgrows it.
Sender’s Honest Limitations
Sender is a smaller platform than Brevo, MailerLite, or Mailchimp, which means its integration ecosystem is narrower, its template library is smaller, and its long-term product roadmap is less certain than a platform backed by Intuit or a large VC-funded company. It works well for what it does, but building your entire email marketing system on a smaller platform carries more migration risk if the platform changes pricing or service terms.
Comparison Table — Free Plans at a Glance
| Platform | Free Contacts | Free Sends/Month | Automation | Branding Removed | Best For |
| Brevo | Unlimited | ~9,000 (300/day) | Basic only | ✓ | Large lists, low frequency |
| Mailjet | Unlimited | 6,000 (200/day) | Basic only | ✓ | Transactional + newsletters |
| Kit | 10,000 | Unlimited | 1 workflow | ✗ (Kit branding) | Newsletters, creators |
| Sender | 2,500 | 15,000 | Basic ✓ | ✗ | Growing lists under 2,500 |
| MailerLite | 1,000 | 12,000 | Full ✓ | ✗ | Automation from day one |
| Zoho Campaigns | 2,000 | 6,000 | Basic ✓ | ✗ | Zoho ecosystem users |
| Mailchimp | 250 | 500 | None | ✗ | Testing interface only |
Which Limitation Hits You First
The real decision framework: multiply your current subscriber count by how many times you plan to email per month.
- 1,000 subscribers × 4 sends = 4,000 monthly sends → any platform above works free
- 5,000 subscribers × 4 sends = 20,000 monthly sends → only Kit covers this free (up to 10K subs)
- 10,000 subscribers × 2 sends = 20,000 monthly sends → Kit (exactly at limit) or Brevo upgrade needed
- 20,000 subscribers × 1 send = 20,000 monthly sends → Brevo Starter at $25/month
How to Choose the Right Free Tool
Match the tool to your sending behavior, not to the headline “unlimited” claim in the marketing copy.
Decision by Use Case
You have a large, older list you contact occasionally: Brevo’s free plan — unlimited contact storage, 9,000 monthly sends. Import your 10,000 old contacts, send one monthly newsletter, pay nothing.
You’re building a newsletter from scratch and plan to email weekly: Kit’s free Newsletter plan — 10,000 subscriber ceiling, unlimited sends, no monthly counter. Start here and stay here until your list crosses 10,000.
You’re a small business just starting email marketing, under 2,500 contacts: Sender — 2,500 subscribers, 15,000 sends, basic automation, genuinely free. Fast to set up, no complexity.
You need full automation workflows from day one: MailerLite’s free plan — 1,000 subscribers, 12,000 sends, full multi-step automation. The subscriber cap is lower, but the automation depth on the free tier is the best in this category.
A Clear Stance on “Free Forever” Marketing
Free email marketing tools are genuinely sufficient for 12-24 months of list building for most small businesses and creators. The point where you need to pay isn’t when your list gets larger — it’s when your sending behavior outgrows the send cap, or when you need automation flows more complex than a single welcome sequence. Don’t pay for email marketing before you’ve hit a real limit. Most businesses don’t hit that point as quickly as email platforms’ pricing pages make it seem.
Frequently Asked Questions
Is there a completely free email marketing tool with no subscriber limit?
Brevo and Mailjet both allow unlimited contact storage on their free plans, but both cap monthly email sends (Brevo at ~9,000/month, Mailjet at 6,000/month) — there is no platform that offers both unlimited contacts and unlimited sends for free.
What free email marketing tool lets you send the most emails?
Kit’s free Newsletter plan has no monthly send cap for up to 10,000 subscribers, making it the best option for high-frequency senders — Sender’s 15,000 monthly sends is the most generous fixed send limit among other free tiers.
Is Brevo’s free plan actually unlimited contacts?
Yes — Brevo’s free plan genuinely stores an unlimited number of contacts without a paywall, but limits daily email sends to 300 (approximately 9,000 per month), so “unlimited contacts” doesn’t mean unlimited sends.
What is the best free alternative to Mailchimp with more than 250 contacts?
Kit (10,000 subscribers free), Sender (2,500 free), Brevo (unlimited contacts free), and MailerLite (1,000 subscribers free) all significantly outperform Mailchimp’s January 2026 free tier reduction to just 250 contacts.
Does a free email marketing plan hurt deliverability?
Free plan users share sending infrastructure with other senders, which can slightly reduce deliverability compared to paid plans using dedicated IP addresses — but major platforms like Brevo, MailerLite, and Kit maintain strong shared deliverability because their business depends on all senders’ reputation, not just paid ones.
Can I build an email list for free without paying for marketing software?
Yes — Kit’s free Newsletter plan supports up to 10,000 subscribers with unlimited sends, landing pages, and forms at no cost, making it a genuinely viable list-building platform for a creator or small business before any revenue is generated.
Is there a free email marketing tool for WordPress?
MailerLite, Brevo, and Kit all offer free WordPress plugins that connect your site’s opt-in forms to their email platform, with no cost on their respective free tiers — MailerLite’s WordPress integration is generally rated the smoothest for non-technical users.
Conclusion
If you want the direct answer: use Brevo if you have a large existing list you contact infrequently — the unlimited contact storage is genuinely unique and the free tier handles one monthly newsletter to a 9,000-person list at no cost. Use Kit if you’re building a newsletter from zero and want to send as often as you want to up to 10,000 subscribers without a send counter following you. For most new businesses and creators just starting out, Kit’s free tier is the cleanest path — no send limits, no credit card, and a real platform built for the way modern newsletters actually work. For the full paid-tier comparison once you outgrow free tools, our breakdown of the best email marketing software for small business covers every major platform with side-by-side pricing.