Interspire — Email marketing with unlimited subscribers

Email marketing platform

Unlimited subscribers. Pay only for what you send.

Interspire is the email platform that never charges you for the size of your list. Build campaigns, automate journeys, and let AI do the heavy lifting — with your subscriber data hosted in the UK and EU.

No card required Cancel anytime UK & EU data residency

Why Interspire

Built around the one thing other tools get wrong: charging you for growing.

01

Unlimited subscribers

Your list can grow to any size without your bill changing. No per-contact tiers, ever.

02

Pay for sends, not size

You’re charged for the emails you actually send each month — and nothing else.

03

AI on every plan

Subject lines, copy, and send-time help are built in — even on the free plan.

04

UK & EU data residency

Subscriber data stays on UK/EU infrastructure and is handled the GDPR way.

Everything you need to send better email.

One place to build, automate, and measure — with AI help on every plan.

Campaign builder

Compose on a clean drag-and-drop canvas, reuse saved blocks, and preview every inbox before you hit send.

AI writing assistant

Draft subject lines, rewrite a paragraph, or generate a first draft from a one-line brief.

Automations

Welcome series, re-engagement, and behaviour-based journeys built from a visual flow.

Deliverability

Authenticated sending (SPF, DKIM, DMARC) and a reputation dashboard so you land in the inbox.

Segments & forms

Grow unlimited lists with hosted signup forms and target the right people with flexible segments.

Analytics

Opens, clicks, and send-time insight in plain language — with exports your team can use.

How it works

Three steps from sign-up to first send.

01

Bring your list

Import your contacts or drop in a hosted signup form. Your list is unlimited from day one.

02

Compose with AI

Write in the editor and let the assistant suggest subject lines and tighten your copy.

03

Send & measure

Schedule a send or set an automation, then track opens, clicks, and deliverability.

Pricing

From £15/mo — unlimited subscribers.

Pick a plan by how much you send, not how many people you reach. Start any paid plan with a 14-day free trial.

Free
Free

5,000 emails / month

Starter
£ 15 /mo

25,000 emails / month

Popular Growth
£ 39 /mo

100,000 emails / month

Scale
£ 89 /mo

500,000 emails / month

Compare all plans

All plans include unlimited subscribers, the AI assistant, and UK/EU data residency.

Get started

Start sending with Interspire today.

Create your account in under a minute. Every paid plan starts with a 14-day free trial — no card, no commitment.

The deliverability brief

Not ready to sign up? Get our weekly email on inbox placement, ESP changes, and what we’re testing — one short note each Tuesday.