Can it Predict PMF?
June 16, 2025
What if you could test product-market fit before building anything? This experiment shows AI personas can predict real user PMF responses with 88.5% accuracy.
Rhys Fisher
Rhys Fisher is the COO & Co-Founder of Rally. He previously co-founded a boutique analytics agency called Unvanity, crossed the Pyrenees coast-to-coast via paraglider, and now watches virtual crowds respond to memes. Follow him on Twitter @virtual_rf
Articles by Rhys Fisher
Showing 1-9 of 16 articles
Validating AI Persona Demographics: A Step-by-Step Guide (With Template)
June 10, 2025
This guide shows you how to quickly verify that your AI personas match intended demographic distributions for age, gender, income, location and occupation. Using a ready-to-use Google Colab template. By validating your audience traits up front, you can prevent misleading simulation results and ensure that rapid, cost-effective persona studies yield reliable, actionable insights.
The Leading Question Effect
June 09, 2025
Leading question can shift public opinion depending on how a question is framed. Using Rally’s synthetic personas, it's now possible to replicate this effect in a controlled experiment, revealing how survey design can manufacture consent or dissent with measurable precision.
What Happens When You Simulate the Next ‘Share a Coke’ Campaign With AI Personas?
June 04, 2025
Coca-Cola flipped its brand slump by pairing personalization with bulletproof pre-launch testing. It's now possible to tap into the same winning formula with synthetic AI personas.
How a Fake Movie Scene Crushed Demand For Mass-Market Blends And Made Ethiopian Coffee Feel Like Art
June 03, 2025
What if a movie scene could reshape consumer preferences and you could test it before releasing your campaign? Using AI personas and implanted memories inspired by Sideways, I simulated a media-driven market shift that made virtual shoppers abandon Folgers for premium Ethiopian coffee.
Synthetic Personas Don’t Replace Real Humans - They Supercharge Your User Research
May 27, 2025
Research with synthetic personas lets anyone make smarter decisions fast, cheaply, and with good-enough accuracy. Instead of interrupting real humans for every idea in your head, you can spin up virtual crowds instantly, ask them questions 24/7, then take the best ideas and test them with real humans.
How To Prevent Churn With Open-Loop AI Persona Simulations
May 27, 2025
Feed your AI personas authentic, lived-experiences, and closed-loop sims break open: you can watch sentiment shift in real time, flag churn risk months early, and pressure-test your renewal strategies before you commit.
How AI Exposes Our Double Standards
April 29, 2025
Polls say most of us believe in “equal justice,” yet the moment a headline names our hero or our villain, our moral math flips. In my latest experiment, I fed Rally personas a stream of fake social-media posts and hard coded them to have a favorite between Kanye and Will Smith. The result? Turns out AI has double standards. So do humans. We witnessed how virtual audience simulations could be used to pressure-test in silicon before PR teams click publish.
Why Stated Values Die at Checkout
April 26, 2025
When it’s your money on the line, do you really pay double for "Made in USA"? Ramon tested it with real shoppers and walked away empty handed. We tested real-time buyer decisions using role-playing agents, and the results might surprise you.