AI agent for growth marketers
Subscriber Growth Experiment Agent
Find signup changes that reliably raise subscriber growth
What it does
Newsletter growth stalls when writers change many things at once and cannot tell what worked. This agent runs one growth experiment at a time. It pulls signups and conversion by source for the last 30 days and picks the source with the most traffic and the lowest conversion. It proposes one change, such as a new form headline or a referral reward, and writes the variant. The writer approves it before it goes live. It tracks signups for control and variant, excluding single-day spikes over three times normal traffic. It needs at least 300 visitors per variant before judging. If the sample is too small or the difference unclear, it extends the test a week, and after two extensions proposes a bolder variant instead of declaring a winner. Results go into a growth log with the numbers. Edge case: a spike from one viral mention is excluded so it does not fake a win.
How it works
Follow the arrows from top to bottom. The orange dashed arrow is the loop: when a check fails, the agent goes back and tries again.
Read the steps as a list
- Previous experiment closed
- Pull signups and conversion by source for the last 30 days
- Pick the weakest high-traffic source and propose one change
- Writer approves the variant before it goes liveThe agent waits here for your OK.
- Track signups for control and variant
- Is the sample large enough and the difference clear?If not: extend the test by a week, or propose a bolder variant after two extensions. Back to step 5.
- Write result and numbers into the growth log
- Next experiment proposed
How it decides
It picks the source with the most traffic and lowest conversion to test next, and needs a minimum sample before calling a result.
- Test one change at a time
- Need at least 300 visitors per variant
- Exclude single-day spikes over three times normal traffic
Make it yours
Every agent is a starting point. You choose these settings for your own situation.
- Minimum visitors per variant (default 300)
- Maximum test length (default 6 weeks)
- Sources allowed for testing
- Where the growth log lives
What keeps you in control
It always asks you first
- Putting a variant live
- Changing the default form after a win
Hard limits
- Never changes live forms without approval
- Never buys subscribers or lists
It stops when
- Done: result logged
- Stop: traffic too low to reach sample in six weeks
Set it up
We guide you through the set-up, step by step
Members get the full set-up guide for this agent. No technical skills needed: you copy, paste and upload.
- One set of instructions to paste into your AI, with the clicks for ChatGPT, Claude, Microsoft 365 Copilot, Gemini and Grok
- The agent then walks you through connecting your own data, one source at a time
- A downloadable copy with the flow chart, the rules and the full guide
