Have you ever spent way too long trying to come up with the perfect subject line for your emails? You know the feeling — you write one, then another, tweak a few words, and still wonder… will anyone actually open this?
You're not alone. Subject lines can make or break an email campaign, but most of us don’t have access to the kind of tools or data that big agencies or seasoned copywriters use to get it right. That’s why I’m incredibly proud to announce something I’ve been working on behind the scenes — a tiny but mighty AI-powered tool designed to solve exactly that problem.
Meet Smart Email Subject Optimiser, the newest mini-app from Coos Creations Ltd., my UK-based digital development company focused on clever, useful micro-SaaS products for small businesses.
➡️ Check it out here: Smart Email Subject Optimiser
What Is It?
The Smart Email Subject Optimiser is a lightweight, browser-based app that helps you write better subject lines for your emails — whether you’re a marketer, freelancer, business owner, or anyone else trying to get more eyes on your content.
You simply type or paste your subject line into the app, and it immediately provides:
- A predicted Open Rate and Click-Through Rate (CTR) based on AI models trained on thousands of campaigns
- A strength score with real-time feedback
- Clear, actionable suggestions for improvements (e.g., change tone, add urgency, reduce length)
- Multiple AI-generated alternative options to spark inspiration
It works for newsletters, promotional emails, outreach messages, follow-ups — pretty much anything that lands in an inbox.
Why I Built This
In my own work — both running businesses and helping clients improve their digital performance — one recurring issue always stood out: email subject lines are tough. Even seasoned marketers can’t always predict what’s going to hit, and A/B testing takes time and volume that many small senders simply don’t have.
I wanted a tool that was:
- Fast (no learning curve or onboarding required)
- Affordable (free for now!)
- Focused (just subject lines — nothing bloated or unnecessary)
- Insightful (AI-powered, but not “over-AI’d” — it still feels like you’re in control)
So I built the Smart Email Subject Optimiser as a true micro-SaaS app — small in scope, big in value. It's the kind of tool I wish I had years ago, and I’m hoping it becomes part of your own toolkit too.
Who It’s For
This isn’t just for big marketing teams (though they’ll love it too). If you’re one of the following, this tool was made with you in mind:
- Freelancers sending cold outreach or client proposals
- Coaches and consultants running email newsletters
- E-commerce store owners promoting sales or products
- Agencies managing multiple client email campaigns
- Startups trying to get traction with limited lists
- Anyone sending emails that need to get opened
In short — if your business relies on email, you’ll benefit.
➡️ Check it out here: Smart Email Subject Optimiser
