I've audited somewhere north of 100 Klaviyo accounts in the last few years, and one thing stands out wiht almost EVERY single acocunt…

They have years of data, yet almost NONE of them have found the days that their emails convert the highest.

Websites and “experts“ will tell you NEVER to send on Sunday or Tuesdays convert best, but there’s a problem wiht that: your list isn't the internet's list.

Every brand, niche, and audience is different, and the metrics you’re optimizing for are different.

In this newsletter, we’ll go through how you can find your brand's best send days (if you have any), and the simple dashboard we use to visualize it.

Most brands pick send days based on what worked for someone else's audience. The data you actually need is already sitting in your Klaviyo account.

One export. One sheet. You'll know exactly when your subscribers open, click, and buy.

Here's why this works when every other "find your best send day" tutorial doesn't:

This only pulls flow data.

Most brands try to run this analysis on their entire account, campaigns included.

Problem is, if you send campaigns every Tuesday and launch new products every Thursday, those days will always show disproportionately high revenue, opens, and clicks.

You're not measuring subscriber behavior. You're measuring your own send calendar.

Flows run based on subscriber actions, not your marketing calendar. They fire every single day based on when people browse, abandon cart, or make a purchase. Clean data. No calendar bias.

That's how you actually find when your list converts.

This is the exact process we run for every client account in the first 30 days.

Step 1: Build the Custom Report in Klaviyo

Why flows only?

Because campaign send days will blow up your data.

If you send campaigns every Thursday, Thursday will always show the highest revenue. You're not measuring subscriber behavior — you're measuring your own send calendar.

Flows run every day. Same triggers, same audience behavior, no calendar bias.

Step 2: Export and Drop Into the Sheet

Step 3: Let the Sheet Do the Math

The right panel automatically calculates:

Then it aggregates everything into the home dashboard showing your top-performing days and worst-performing days across the full year.

One paste. Full year of stat-sig data.

The Email Insights Hub does three things:

1. Kills the guesswork. You see exactly which days your subscribers actually convert, not which days you happen to send campaigns.

2. Surfaces the money days. Top-performing days ranked by open rate, click rate, order volume, and total revenue. If Monday drives your highest AOV but Thursday drives the most orders, you'll see it immediately.

3. Shows you the dead zones. Worst-performing days tell you where not to test new offers or launch hero campaigns. If Saturday consistently underperforms, don't waste your biggest swing there.

What's included:

This is the same sheet sitting in our client folders right now.

Get the Email Insights Hub here ⤵️

P.S. One supplement brand we audited was sending their reorder campaign every Thursday because "that's email marketing day." Flow data showed Tuesday drove 23% higher revenue per recipient. We moved the send time. Same email, different day. $47K more revenue in 90 days.