How to Choose an Email Marketing Platform — The Decision Framework

The framework

Most “how to choose an email marketing platform” guides present a feature matrix of 15 platforms and let you compare checkboxes. This isn’t a decision framework — it’s a comparison dump that generates paralysis.

The real decision requires answering four questions in order:

1. What’s your list size (or target size in 6 months)?
2. How often will you send?
3. What’s your primary use case?
4. What’s your budget ceiling?

The first two questions determine your billing model. Everything else is a tiebreaker.

Step 1: billing model first

The single most important variable in platform selection is the pricing model: per-contact vs per-send. This determines your cost more than any feature comparison.

Per-send pricing wins when:

• You have a large list but send infrequently (monthly, quarterly, event-driven)
• You want to grow your list aggressively without worrying about tier jumps
• You’re a nonprofit, local business, or infrequent newsletter sender

Per-contact pricing wins when:

• You have a small list (under 1,000) and send daily or multiple times per week
• You’re using advanced per-contact features (Klaviyo’s revenue attribution, ActiveCampaign’s pipeline integration) that justify the premium

The break-even rule: If you send fewer than 4 emails per contact per month, per-send pricing (Brevo) is almost always cheaper than per-contact platforms. Use the calculator:

Monthly sends = (list size) Ã- (emails per contact per month)

If monthly sends < 20,000: Brevo Starter (£9/mo) is likely cheaper than any per-contact platform
If monthly sends > 100,000: evaluate on a per-platform basis

Step 2: use case tiebreaker

Once you’ve determined your billing model, narrow by use case:

Ecommerce (Shopify, WooCommerce)

Under $20K/mo store revenue: Omnisend ($59/mo at 5K contacts, SMS bundled) or Brevo (if you send infrequently). Klaviyo is overpriced for this scale.

$20K–$50K/mo: Omnisend or Klaviyo — evaluate based on whether you’ll use predictive segmentation. If you have an operator or agency who can fully build out Klaviyo flows, Klaviyo. If not, Omnisend.

Over $50K/mo: Klaviyo. The revenue-per-recipient attribution and predictive flows generate measurable ROI at this scale.

Creator / newsletter

Under 1,000 subscribers: MailerLite free (1K contacts, automation, custom domain). beehiiv free (up to 2,500 subscribers on some plans, built-in growth mechanics).

1K–10K subscribers: ConvertKit/Kit ($29–$99/mo) if you need tag-based segmentation and native commerce. MailerLite ($32/mo at 5K) if you want a cleaner editor and lower price.

Over 10K subscribers: ConvertKit Creator ($99/mo) or GetResponse (if webinars are part of your product).

B2B SaaS / lead nurture

Small team, simple nurture sequences: GetResponse Marketing Automation ($59–$94/mo at 5K contacts). Brevo Business (£49/mo) if your automation needs are basic.

Serious B2B automation (pipeline integration, conditional splits, goal conditions): ActiveCampaign Plus ($145/mo at 5K). The automation builder is the B2B standard.

Enterprise / large team: HubSpot Marketing Hub (from $890/mo for 2K marketing contacts) or ActiveCampaign Professional ($386/mo at 5K).

Nonprofit

Infrequent sender, any list size: Brevo. The per-send model is purpose-built for nonprofit sending patterns (monthly newsletters, quarterly appeals). A 5K-donor list on Brevo: £9/mo. Same list on Mailchimp: $75/mo.

Event-driven nonprofit: Constant Contact. Their event management features (RSVP forms, event reminders, attendee tracking) are unmatched.

Specific donor-CRM integration required: Mailchimp, if you need DonorPerfect or Bloomerang connectors.

Small business, general newsletter

Free tier priority: MailerLite (1K contacts, automation, custom domain on free plan).

Under 2,000 contacts, infrequent sends: Brevo free.

2K–10K contacts, weekly newsletter: Brevo Starter (£9/mo) or MailerLite Growing Business (£32/mo). Both beat Mailchimp Standard ($75/mo) on price at comparable features.

Step 3: budget ceiling

Run the budget check after identifying the right use-case platform:

The realism gate: If you tell the decision wizard you need deep B2B automation with conditional splits and a budget of £20/mo — there’s no platform that delivers this. The honest answer is: the realistic floor for serious B2B automation is £100–£350/mo. Below that, you get basic drip sequences. Above it, you get the full builder.

Step 4: commit and start

The most common mistake in platform selection: analysis paralysis. Every platform listed above has a free trial or a free tier. The cost of trying the wrong one for 30 days is 30 days, not £thousands.

The decision sequence:

1. Calculate your list size and sends/month
2. Apply the billing-model filter (under 4 emails/contact/month → start with Brevo)
3. Apply the use-case filter
4. Apply the budget ceiling
5. Start the free trial → build one automation → decide

If you’re still unsure: Take the 60-second decision wizard — 5 questions, outputs top-3 platforms with reasoning.

Common mistakes to avoid

1. Starting on Mailchimp by default — The brand recognition is not a reason. Their free tier is now 250 contacts with no automation.
2. Over-buying automation depth — If you’re a 500-contact newsletter, you don’t need ActiveCampaign’s pipeline integration.
3. Ignoring migration cost — Switching platforms later costs 6–10 hours. Choose with some durability in mind.
4. Not accounting for list growth — If you’re planning to grow from 500 to 10,000 contacts in 12 months, model the cost at 10K contacts, not 500.
5. Treating “integrations” as equivalent — Mailchimp has 300+ integrations; Brevo has fewer. If specific integrations matter (DonorPerfect, QuickBooks), verify before switching.

Related: Best email marketing platforms 2026 · Per-contact vs per-send pricing · Decision wizard