Send Cold Emails with AI Agents
Yet another API wrapper for a specific sales tool in a crowded agent market.

Connect your own SMTP, import a CSV, create templates and bulk-send small batches while keeping a record of who you've messaged — that's the explicit promise and it's refreshingly focused. The UI in the signup screenshot is tidy and usable, but the space is crowded: without built-in deliverability tools, analytics, or scheduling this mostly replaces scripts and spreadsheets rather than upending outreach tooling.
Indie makers, founders, growth folks, small sales/marketing teams, non-technical collaborators
As an engineer, I've always struggled to keep track of cold mailing lists for my side projects.
I could find contacts and save them in a sheet. The part I hated and struggled with was bulk emailing and keeping track of who I already emailed, adding notes, etc.
There's just wasn't any intuitive and simple solution I could find for this that I liked. Especially, if you want to connect you own custom domain email over SMTP.
I just wanted something simple that let me connect my own SMTP config, create a template, import a CSV with contacts and then bulk send 15 emails at once all by keeping the record of sent ones.
Nothing more, nothing less. Focus on finding leads and building, rather than writing every email manually or paying for bloated software just to do this.
Scripts worked, but I needed to share the management with non-technical folks.
Current options I found - I didn't like at all, overcomplicated and time consuming.
So, over the weekend I decided to build the simple OSS tool to help me achieve this and save time in the future.
The tool is built using SvelteKit as a weekend project; so, like any weekend project, the code is not the best or most performant, but it gets the job done.
Demo: https://cold0-gamma.vercel.app/register Repo - feel free to fork or contribute: https://github.com/danesto/cold0
Yet another API wrapper for a specific sales tool in a crowded agent market.
Yet another cold email tool competing with Instantly and Lemlist.
Gmail for your own domains, with built-in warming, tracking, and multi-stage follow-ups.
Deletes newsletter backlogs Gmail ignores, caching headers locally for speed and privacy.
Another Lemlist/Smartlead alternative; no clear differentiation from crowded cold email space.
Yet another cold email tool competing with Lemlist and Instantly with no clear differentiator.