An open-source Instantly alternative for careful outreach
Instantly is built to send cold email at scale across many inboxes. Tin is built for the founder who sends a few dozen good emails, approves every one, and wants follow-ups handled.
codex mcp add tin --url https://app.tin.computer/mcpWhat Tin does in place of Instantly
Instantly is a cold email platform known for unlimited sending accounts, warm-up and deliverability tooling at scale.
| the job | how Tin does it | workflow |
|---|---|---|
| Campaign sending | Paced sends with a daily cap, window and timezone. | outreach.email_campaign → |
| Follow-ups | Reply-aware follow-up timers. | outreach.email_campaign → |
| Choosing who to email | Shortlist from your mailbox and calendar. | outreach.email_shortlist → |
What Tin does not replace
Tin is not a clone. Here is where each one fits.
Instantly still does this better
- Inbox warm-up and sending account rotation.
- High-volume sending and a lead database.
Choose Tin when
Your outreach is personal, low volume and sent from your own address.
Stay with Instantly when
You need volume and deliverability infrastructure.
What every workflow here comes with
Battle tested on real products
These are the workflows we run for real companies. Claw Messenger went from about $45 to $2,105 in monthly revenue in 124 days on them. Each one has declared inputs, bounded execution and tests, and anything public waits for your review.
See the case study →Open source: read it, fork it, self-host it
Apache 2.0. Every workflow is a folder in the repository: the steps it runs, the data it reads and what it is allowed to do. Change it, or run the whole system on your own machine.
Open the repo →Runs on the agent that already knows your product
Tin connects to Claude Code, Codex or Cursor over MCP. That agent has your repository open and knows your product, customers and voice, so it fills the inputs and reviews the output. You never brief a new tool from zero.
All workflows →The workflows behind this page
Each one is a folder in the repo. Open a page for its steps, inputs and output.
Questions
How many emails can Tin send per day?
You set a daily cap and send interval. It is designed for careful sending from one connected mailbox.
Is Tin really open source?
Yes. Tin is licensed under Apache 2.0 and the source is at github.com/tin-computer/tin. You can read every workflow, change it, and self-host the whole system.
Which coding agents can run Tin workflows?
Any agent that speaks MCP, including Claude Code, Codex and Cursor. There is also an API, and the same projects run in the browser at app.tin.computer.
Why run marketing from a coding agent?
Because it already knows your product. It has the repository open, so it fills workflow inputs accurately, reviews output against what the product really does, and can act on the results in the same session.