Test creative with your ideal persona in minutes.

Delfi gives you real time, persona-specific feedback on copy, offers and messaging without the cost or delays of focus groups.

Define your persona

Tell Delfi who you're speaking to: age, background, goals, tone, and create your persona

Drop in your creative

Paste anything you want feedback on: ads, landing pages, copy, taglines or emails.

Get instant feedback

Delfi responds like your audience would: with reactions, questions, tone critiques and emotional reads.

“Delfi gave us the kind of insight we used to spend thousands on-without running a single focus group.”— Molly M, Founder of DTC Startup

“It's like having your customer on call while you write. We iterate more, build faster, and ship with way more confidence.”— Nate C, VP Marketing at Growth Agency

Why not just use ChatGPT?Because you're not trying to build a testing tool. You need relevant, consistent, actionable feedback.

  • Built for testing, not tinkering. Delfi has a built-in scoring framework for evaluating copy across clarity, resonance, and emotional fit. You’re not starting from scratch or guessing what to ask. You’re getting structured, directional insight, fast.

  • Compare copy with confidence. The Comparative Feedback Engine runs creative through the same lens, so you can A/B test headlines, CTAs, or full messages across personas and actually trust the results.

  • Think like your buyer, don't just sound like them. Pressure-test your creative against your persona’s worldview surfacing confusion, skepticism, or missed emotional beats GPT wouldn’t catch without perfect prompting.

  • Personas that evolve with you. With Persona Threads, Delfi remembers how each simulated customer has responded before, so you can build messaging over time without losing context like ChatGPT does between sessions.

  • Sharpen through friction. Delfi isn’t polite. The Pushback Layer is built to flag vague language, unearned claims, and misaligned tone so you can fix it before your customer calls it out.

Get early access to the future of persona-driven messaging.