PERENNIAL FUNDAMENTAL
A persona file for any voice you need to write in
Perennial Fundamental builds a research-backed communication fingerprint: a markdown persona you import into Echo or any AI assistant.
Import the delivered markdown as a named persona in Echo, or use it in Claude, ChatGPT, and other assistants. Echo's default template works too: customize when you are ready.
Communication fingerprint
Questionnaire → research-backed persona markdown you own forever.
$22one-time
One-time payment. No recurring billing.
Daily drafting? Start with Perennial Echo free, with persona slots on paid tiers.