Voice-first AI email marketing for the experts, creators and entrepreneurs.

   

We write, strategise, build and send for you. In your voice. With the principles of the godfathers of marketing baked in. So you can stay in your lane and get paid to do what you do best.

Be one of the first 100 founding members. We’ll email you the moment doors open.

You've felt this.

It's Tuesday morning. The coffee's gone cold. You've started three emails. Deleted all three. Your list is waiting. And the day is swooshing by.

Sound familiar?

  • Every month, your ESP charges you for features you've never used. CRM, popups, landing pages, sales pipelines. The bigger your list grows, the more you pay for things you don't need.

  • You sent the email. Half your subscribers might never see it. Gmail might send you to Promotions. Outlook might break it in dark mode. Meanwhile, you haven't the foggiest. You can't fix what you can't see.

  • Writing was never your thing. So you turned to AI for help. The output came back clean, competent, flat. You tweaked it. Re-prompted. An hour gone. Still not an email that sounds like you.

  • You have hundreds, possibly thousands of subscribers. They all behave differently in their inbox. Open at different times. Click on different things. But the same email goes out to all of them, at the same hour, in the same format.

  • You hit send. There's a small flinch. Was that even the right email to send? You refresh the dashboard at lunch. The open rate is lower than last week. Next week's a blank space again. Maybe just another newsletter. Maybe something promo. You're not sure what. And the doubt starts to set in. A quiet voice whispers: are they still listening?

Until now.

Most AI email tools work like this.

They turn you into a part-time prompt engineer.
We don't.

You pick the email you need. You describe it like you'd describe it to a friend. We handle the rest. The writing, the structure, the principles, the delivery. All in your voice.

Five jobs we do.So you don't have to.

Here's what we handle. So you can do what people actually pay you for.

  • An email platform that just does emails.

    Other platforms have FOMO. We're proud to miss out. No CRM. No course builder. No website builder. No SMS dialer. No customer service inbox. Just the things that make email work: writing, sending, scoring, deliverability. Priced for what you actually use.

  • Land in the inbox. Your email looks right when it gets there.

    DKIM, SPF, DMARC, custom domain, sender warmup. Dark-mode rendering in Outlook checked and fixed before you send. Bounce and complaint handling baked in. All built into the back end. You don't even have to think about it.

  • Write emails that sound like you.

    Start from a blank page, or paste in your own, or pick from a dropdown of emails every service-based business needs to send. GravityFlo's Brand Signature learns your voice from your past writing. Add the details you want included. We write it. Every email comes out in your tone. No more second-guessing what to send or what to write. No more bouncing between AI tools and your ESP. No more re-prompting until your eyes glaze over. No more "this doesn't sound like me."

  • Send each subscriber the email they'll actually open.

    GravityFlo personalises by behaviour. The more it learns about your subscribers, the more it fine-tunes how you write to them. Different segments behave differently. Some always open. Some never click. Some only buy when you launch. Over time, GravityFlo tailors your emails to each segment, and sends them at the times each segment actually opens, wherever in the world they are. Every send tuned to the segment, not the broadcast.

  • Know before you send.

    Every email gets a Flo Score in real time. A readability check that tells you whether your subscribers can scan your email in seconds or not. Fix it before you send, courtesy of the pre-flight checker.

GravityFlo is rooted in the timeless principles of marketing, copywriting and influence. The science Cialdini wrote books about, the craft Belgray makes personality-driven, the formulas Schwartz wrote the rulebook on. None of which you have to study to get the benefit of.

Join the Waitlist

Be one of the first 100 founding members. Pick your tier. Lock your founding rate while it lasts.

Here's what that looks like in practice.

Step 1

Pick the email you need. Or paste a reference email you'd like to use.

Step 2

Add the details you'd like to include.

Step 3

We write the email or email sequence. Review, sign off, schedule or send.

All in your voice. And in minutes.

Everyone has AI now. No one has your voice.

Email is the channel that carries your voice furthest.

It still drives more revenue per dollar than any other marketing channel. Paid search. Social. Display. All of them. Averaging around $36 in return for every dollar spent.

Email is the one channel where people raised their hand and said: yes, I want to hear from you. Your job is to honour that. Show up consistently. Add value. Make them feel seen. Make them feel like more than a row in a spreadsheet. That's how a list moves from dormant to lucrative.

That's not always easy when you're being pulled in fifty directions. GravityFlo gives you a tool to write emails that are faster to create, strategically built, and rooted in the buying psychology your audience actually responds to.

The opportunity to make an impact and stand out through email has never been bigger. The cost of getting it wrong has never been higher.

50%

of small businesses have no one dedicated to marketing.

(That probably means you. The marketer. The copywriter. The strategist. The deliverability technician. All of it. And that probably wasn't on your radar when you started your business.)

Source: LocaliQ Small Business Marketing Trends Report, 2026

24 hours

the average creator spends per month writing weekly emails to their list.

(That's nearly a full working day, every month, staring at a blank page trying to figure out what to write. Time that could be going to your clients, your craft, your business, the work only you can do.)

Source: Newsletter creator economy surveys, 2026

Half

of email marketers admit they don't reliably measure whether their email marketing is working.

(Translation: there's a chance the doubt that whispers "are they still listening?" has been right all along. The good news: with the right data in front of you, you can actually answer that question.)

Source: Email marketing ROI measurement research, Constant Contact, 2026

“Your email list is your most valuable asset. It's the foundation of your business.”
- Amy Porterfield
Entrepreneur, Digital Course Expert, Bestselling Author, and Podcast Host

Which is why we built GravityFlo.

Married. Co-founders. Mostly still on speaking terms.

Portrait of Nat Milligan

Strategist · Copywriter · Voice keeper

Nat Milligan.

Twenty years in sales and marketing. Thirteen of those years writing copy for a living. Years inside award-winning advertising agencies and top-tier marketing firms, leading launches, writing campaigns, building funnels for six to nine figure businesses in personal development and wellness. Founder of The Copy Rebel.

Nat watched AI land in the writing world from the inside. The creators she’d spent years coaching into finding their brand voice started to sound like the same bland newsletter. And the friction grew. People wanting to sound authentic, leaning on AI tools that made them generic. The harder they tried, the more their unique copy style disappeared.

She’s also spent years working inside all the big boy ESPs. They all chase the same trap. Bolting on CRMs, course builders, popups, sales pipelines. Stacking bells and whistles until email itself isn’t the point anymore. Even though, in her opinion, email should be at the heart of the marketing process. Because it still has, to this day, the highest ROI compared to other channels.

GravityFlo is her chance to prove it. An email marketing platform with email at the centre. AI-native from its conception. Not bolted on after. The right tool, at the right time, for people who feel something is missing in their email marketing. Sending with crossed fingers. Never quite seeing the results they’re working so hard to achieve. This is the gap. The one GravityFlo was built to fill.

Portrait of Drew Milligan

Founder · Builder · Simplifier

Drew Milligan.

Drew is in love with technology. Almost as much as he’s in love with his missus. Obsessed with automation. Allergic to bloat. Always hunting for the simpler way through. He’s dyslexic, so he looks for the shortcuts when everyone else makes it complicated. Ridiculously good at finding the fastest path between an idea and the working thing.

He’s not a natural musician. He taught himself music production through technology. Built a music career off the back of it. Thirty plus years in the game. He’s not a natural coder. He taught himself by vibe coding his way into it. As a teenager, he watched someone build a recording studio… Then built one himself from scratch.

That’s the brain that built GravityFlo. Same approach he took to music. Brief the piece into existence, then refine.

He’s spent years watching Nat work inside the big-box email platforms. Watched her wrestle the bloat. Hunt for the simple version of features that should never have been complicated. So when he set out to build GravityFlo, he knew exactly how it had to feel. Because he’d watched what the alternative looks like.

Drew leads the build. Platform, AI, design, and the engineering that makes email land… in your subscribers’ inboxes at the right time.

PS.

Most of the time, Drew brings the science, Nat brings the art. Sometimes it flips. Sometimes we argue. Hey, we’re husband and wife co-founders. It happens. Having said that, there’s no one else we’d rather be squabbling over words on a page with at 2am.

Word of mouth

GravityFlo is fresh out the gate. Nat’s been around the block more times than she cares to remember. Here’s what some of the people she’s worked with have to say.

Nat was my ninja in the sense of copywriting, taking my words, my work, all the things that I do for people all around the world and turning them into magic. Whether that’s my captions, my emails, my sequences, my funnels. She has been one of the most incredible people to work with on making my words matter at a deeper level. Someone who is deeply, deeply present, incredibly heart-centred and takes massive pride in her work. If anyone is on the fence to work with Nat in whatever capacity, please walk the path, because there’s massive transformation on the other side of that decision.

Portrait of Nick Santonastasso

Nick Santonastasso

Global Keynote Speaker, Entrepreneur & Transformational Coach

She’s an excellent copywriter with real craft. Natalie can go deep into messaging, structure, and nuance, and she takes pride in producing work that’s thoughtful and well-executed. Beyond her skills, Natalie is a fantastic person to work with. She’s supportive, dependable, and brings a calm, strong presence in fast-moving environments. If you’re considering working with Natalie, I strongly encourage you to give it a go. I’m confident you’ll never regret it.

Portrait of Alessio Pieroni

Alessio Pieroni

Founder, Scale for Impact & former CMO at Mindvalley

A wall of voices

“An investment I wish I’d made years ago. Nat gave me clarity around my ideal customer and brand voice I didn’t know I was missing.”

Scherise

Podcaster & Mindful Manifestation Mentor

“Natalie is a powerhouse. Energy, love, expertise. She got me clear on my business and helped me dream bigger.”

Kate

Embodied Psychotherapist

“I got my website live and my email automation running. Stoked.”

Sarah

Online retailer & wellness coach

“She doesn’t just teach you how to write copy. She brings out the best in you. My creativity is out of the cage and not going back.”

Tracey

Copy Rebel graduate

“Nat knows her stuff. Clear direction, loads of motivation, ideas that are spot on. You’ll be tickled pink with the final product.”

Alicia

Health & Wellness Entrepreneur

“We jumped straight in. No beating around the bush. She came prepared. Genuinely positive, enthusiastic, contagious. Skill, knowledge, experience. All there.”

Andrew

Cabaret Performer

“She got me from the very first moment. Holistic, tailor-made, never one-size-fits-all. Reaching out to Nat was the best decision I made.”

Milena

Psychotherapist & Integrated Life Coach

“If you’re on the fence, just do it. More than a course. A journey to spread your wings and fly.”

Claire

Copy Rebel graduate

“The next generation of copywriters needs a mentor passionate about the craft. Nat is the guiding light.”

Grace

Copy Rebel graduate

“Everything you need. Nat listened, supported every step. She genuinely cares.”

Nicole

Copy Rebel graduate

Why people are switching.

Because email marketing should feel like an advantage, not a second job.

Swipe to see the full comparison.

FeatureKitFlodeskBeehiivMailchimpActiveCampaignKlaviyoGravityFloAI
Brand Signature AI
Learns your voice from past writing
PartialPartialPartialPartialPartial
Flo Score before send
Real-time readability check on every email
PartialPartialPartial
Per-subscriber send-time intelligence
PartialPartial
DMARC / SPF / DKIM auto-handling
ManualManualPartialManualPartialPartial
Outlook dark-mode preview
Bot-click filtering
PartialPartialPartial
Just email
No CRM, popups, landing builder, journey maze
PartialPartialPartialPartial
Price at 2,500 subs
Per month
~$49$25~$49$60~$70~$65$29
Founding member price-lock

Coming from one of the bigger boys?

HubSpot, GoHighLevel, Kajabi and Keap (formerly InfusionSoft)… these are different animals (respectfully speaking). They do everything, including email. We do email properly only. [Wink]

If you want to keep them for the rest of your stack and bring just the email side over to us, no problem, drop us a line. We’ll handle the move.

Asked. Answered.

Will GravityFlo actually sound like me, or just sound like AI?

Honest answer: it will sound as good as you make it. Like any AI tool, it will sound like you if what you give it sounds like you.

Show our Brand Signature 3 to 5 of your past emails to start. The more you feed it (your sentence rhythm, your word choice, the phrases you reach for, the colloquialisms only you say) the sharper it gets. Every new email comes out in your tone, not the AI’s. And every send teaches it a little bit more.

The promise running through everything we do: an AI tool that amplifies your voice. Never replaces it.

Why use GravityFlo when I can just use ChatGPT or Claude?

Fair point. We use them too. But not for email. Not anymore.

Here’s the thing. ChatGPT and Claude generate the average of every email they’ve ever read. They’re great. They’re generic. And they’re limited by how good your prompt is. Most of us don’t write great prompts. We’re experts, creators and entrepreneurs, not prompt engineers.

GravityFlo brings 20 years of marketing experience and 13+ years of copywriting baked into the back end. The frameworks of the world’s best marketers, salespeople, and copywriters are encoded into every email you’ll write. Brand Signature learns your voice. Chat Mode does the prompt engineering for you. Flo Score tells you how each email is likely to perform before you press send.

You’re not typing prompts and hoping. You’re not second-guessing yourself or wondering what to write next. You’re sending the kind of email the best in the business would write, selling your products to your people, in your unique way.

Is my list size right for this?

Most likely, yes.

We open with two founding tiers. Starter at $29/mo, for lists up to 2,500. Creator at $49/mo, for lists between 2,500 and 5,000.

Both rates are locked at your tier band, for as long as your list stays in it. Outgrow the band? You move up to the next tier. Which is a happy problem, because it means your list is making you the money you came here to make.

Smaller list right now? Welcome. GravityFlo works whether you’re starting fresh or already at scale. If you’d rather build a few hundred more subscribers on a free tool before you commit to a paid platform, that’s also a smart move. Either way, the door’s open.

Got more than 5,000? Phase 2 is the bigger-pond version of this. Drop us a line. We’ll bring you in when it’s ready.

Why should I trust a brand-new ESP with my deliverability?

Fair question. And we don’t take it lightly.

Ready for some technical jargon? Here goes. GravityFlo runs on Resend, the modern email infrastructure that powers some of the most reliable senders on the internet. Each workspace gets a custom sending domain. DKIM, SPF and DMARC are auto-configured. None of the DNS fiddle you used to have to do. Bounces and complaints handled automatically.

Deliverability is one of our pillars. It’s an area we are constantly reviewing and optimising. Because for our customers, the experts, creators and entrepreneurs, every email you send needs to land. Every email needs to be opened. Every email needs to do its job. You’ve worked hard to grow your list. We’re not letting a deliverability blip cost you the trust you’ve built.

What happens after the first 100 founding spots are gone?

Standard pricing kicks in. At the higher rate.

This isn’t fake urgency. The founding-member price is real. When the 100 spots are gone (across both tiers combined), they’re gone. And the prices will go up.

Translation: if pricing is a factor, get the founding rate and join us now. We will never be cheaper than this.

“The money is in the list.”
- Dan Kennedy
Direct Response Marketing Expert, Author, and Founder of Magnetic Marketing

AI email marketing is the marriage of art and science. Get it wrong and your subscribers file for divorce.

The science is what makes the message arrive in the inbox. The art is what makes someone open it. The voice is what makes them stay subscribed. The strategy is what makes them buy.

Most platforms get distracted by everything else. We built GravityFlo to focus on what actually matters: writing AI emails rooted in your brand voice. Sending them where they need to land. And weaving the marketing playbook through the back end so every send is sharper, more strategic, and more likely to convert than the last.

The data is right there in front of you. Simplified. Visible. So you can make decisions rooted in fact, not feelings.

This is what AI email marketing should have been from the start. The platform with email at the centre. With your voice at the heart. For the people who already know how much email marketing matters in their business. And for the ones about to find out.

Pick your tier. Lock your founding rate. (Outgrow it and you’re winning.)

Two founding tiers. Lock your rate as long as your list stays in the tier. The first 100 in lock the rate, regardless of which tier they pick.

Founding 100 · Tier-locked

Founding Member, Starter

$29/month

Locked at this rate for as long as your list stays under 2,500 subscribers.

Emails that sound like you, every time. Brand Signature learns your voice from your past sends.
The prompt engineering done for you. Just describe what you need and we write it.
Know how it’ll land before you press send. Flo Score on every email.
Each subscriber gets your email at the time they actually open.
Deliverability handled in the back end. DKIM, SPF, DMARC, dark-mode rendering. All sorted.
The kind of email the best in the business would write. Frameworks of the best marketers, salespeople, copywriters and launch strategists baked in.
Direct line to the founders. Priority support.
Join the Waitlist
Founding 100 · Tier-locked

Founding Member, Creator

$49/month

Locked at this rate for as long as your list stays between 2,500 and 5,000 subscribers.

Emails that sound like you, every time. Brand Signature learns your voice from your past sends.
The prompt engineering done for you. Just describe what you need and we write it.
Know how it’ll land before you press send. Flo Score on every email.
Each subscriber gets your email at the time they actually open.
Deliverability handled in the back end. DKIM, SPF, DMARC, dark-mode rendering. All sorted.
The kind of email the best in the business would write. Frameworks of the best marketers, salespeople, copywriters and launch strategists baked in.
Direct line to the founders. Priority support.
Join the Waitlist

Two tiers. One founding cohort. 100 spots total, split however our community arrives. Whichever tier you pick, your founding rate locks for as long as your list stays in the tier band.

If your list grows past your tier (which we hope it does, because it means you’re making money), you move up to the next tier. That’s not us breaking the promise. That’s you winning the game we built this platform to help you win.

Got a list over 5,000? Phase 2 is the bigger-pond version of this. Drop us a line. We’ll bring you in when it’s ready.

Register for Phase 2 interest

Founding spots filling fast. Once they’re gone, standard pricing kicks in.

About GravityFlo

GravityFlo is a voice-first AI email marketing platform built for the experts, creators and entrepreneurs who write their own emails. GravityFlo was co-founded by Drew Milligan (AI tool builder, developer, and music industry veteran) and Natalie Milligan (twenty years in sales and marketing, thirteen years writing copy professionally, founder of The Copy Rebel). GravityFlo is purpose-built for solo and small-team businesses who care about how their emails sound and want to stop spending hours every week wondering what to write.

GravityFlo's three core features are Brand Signature (AI that learns your voice from your past writing), Chat Mode (a structured briefing flow where you describe the email you need and the AI does the prompt engineering for you), and Flo Score (a real-time scoring system that predicts subject line strength, readability, and likely engagement before you send).

GravityFlo is an alternative to traditional email marketing platforms including Mailchimp, Kit (formerly ConvertKit), Flodesk, Beehiiv, ActiveCampaign, and Klaviyo. Unlike those platforms, GravityFlo focuses on email writing, sending, scoring, and deliverability only, with no CRM, no course builder, no website builder, no SMS dialer, and no customer service inbox.

Founding member pricing is two-tier: Starter at $29 per month (lists up to 2,500 subscribers) and Creator at $49 per month (lists between 2,500 and 5,000 subscribers). Both rates are locked in the tier band. Your founding rate stays the same as long as your list size stays in that tier. The first 100 founding members across both tiers combined lock their rate. After the founding 100 fills, standard pricing applies.

Visit gravityflo.ai to join.

GravityFlo
GravityFloAI

AI-native email for entrepreneurs, creators and founders. Less force. More flow. Higher conversions.

Product

Company

Legal

© 2026 GravityFloAI. All rights reserved.AI amplifies your voice. Never replaces it.