One integration with Klaviyo. No rewrite of your copy, your design, or your sending schedule. Then a holdout group proves exactly how much it was worth.
Illustrative. Your actual placement is measured per campaign against a holdout group — see below.
The Promotions tab is a classification decision Gmail makes before your customer ever sees the email. We change what that classifier sees — not what your customer reads.
One integration, read and write scoped to campaigns. About five minutes, no developer required.
Applied automatically to each campaign as it goes out. Your copy, design, offers and schedule stay exactly as they are.
A slice of your list is deliberately left untouched, so the difference between the two groups is attributable to us and nothing else.
Any vendor can point at a rising open rate and take credit for it. Seasonality moves open rates. A good subject line moves open rates. The only way to know what we did is to run the same campaign both ways, at the same time, to the same kind of people.
Same subject line, same creative, same send time.
Randomly assigned, statistically comparable, deliberately left alone.
The gap between those two groups — in opens, clicks and revenue per recipient — is the number we report. It is the only figure that survives the question "how do you know it was you?" And if the gap is zero, we tell you that too.
Placement is a multiplier on every campaign you send between now and December 31st.
Your numbers, our arithmetic, shown in full: sends × the open-rate gain you set × a 10% click-of-open and 12% purchase-of-click rate × your AOV. Tools in this category publicly claim 50–100% open lift; the slider starts at the conservative end. This is a model. The holdout group replaces it with your real number.
| Primary | Maverick | Mailmend | |
|---|---|---|---|
| What it is | Inbox placement, and only that | One of three products, behind an AI-video homepage | Inbox placement |
| To see pricing | On this page | Book a demo | Book a demo |
| To get started | Form, no call | Demo call | Demo call |
| Holdout proof | Every campaign | Yes | Not stated |
| Q4 2026 cost | Free, first 100 brands | 2-week trial, then paid | Quote on request |
Comparison reflects publicly available information on each company's own website as of September 2026.
Not a trial that converts to a charge. Not a demo call to find out the price. Free through December 31st, for the first hundred brands that take it.
Applied automatically once Klaviyo is connected. Nothing to remember, nothing to paste per send.
Opens, clicks and revenue per recipient for both groups, so the lift is attributable rather than asserted.
Where your campaigns land today, per provider, so there is a baseline to measure against.
Disconnect in one click. No contract, no notice period, nothing to cancel.
Primary is the first software Growth Legend has brought to market. We've been fixing email programs by hand as a service for years; this is the part we finally turned into a product.
It's new, and almost nobody has heard of it. A hundred brands with a measured holdout number going into 2027 is worth more to us than anything we could buy with an ad budget — so we're spending Q4 doing the work instead of marketing it.
You get the placement lift and the measurement. We get to ask for a testimonial if the number is good, and to hear about it if it isn't. That's the whole arrangement.
The cap is capacity, not scarcity theatre. Each account takes real setup time, and there are only so many weeks left in the quarter.
Two fields. We'll come back within one business day to connect Klaviyo.
hello@growthlegend.comConfirmed against
Want to check your domain's authentication first? Run the free scan.