SendPI is an AI communication platform that predicts how your messages will be received before you send them. It scores messages 0-100 for conflict probability, rewrites them to achieve desired outcomes, and generates precision AI instructions from plain English.

Yes! SendPI offers a free pilot plan with 200 credits per month. This includes PI Check (message analysis), PI Craft (cast generation), access to the PI Store with 4.3 million precision casts, and the Chrome Extension.

What AI platforms does SendPI support?

SendPI supports ChatGPT, Claude, Gemini, Perplexity, Microsoft Copilot, Cursor, and Emergent. Each cast is optimized for the specific platform you're targeting.

What is a precision cast?

A precision cast is an expert AI instruction generated by SendPI. Instead of writing vague prompts, you state your desired outcome in plain English and SendPI generates the optimal instruction for your target AI platform.

Does SendPI have a Chrome Extension?

Yes. The SendPI Chrome Extension adds all 6 layers of communication intelligence directly into your browser. It auto-detects prompts and provides instant PI Check scores, rewrites, and one-click cast pasting.

What is SendPI MCP Server?

The SendPI MCP Server (sendpi-mcp-server on npm) lets you use SendPI tools directly inside Claude Desktop, Cursor, and any MCP-compatible AI client. Install with: npx sendpi-mcp-server

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Why π ?

π is the world's most famous constant — infinite, irrational, and present in every circle, wave, and structure in the universe. It represents precision through infinite calculation.

THE NAME

Send + π = SendPI

Send — the act of communicating. Every email, message, prompt, and interaction starts with pressing send.

π (PI) — Predictive Intelligence. Just like π calculates the relationship between a circle's circumference and its diameter with infinite precision, SendPI calculates the relationship between what you write and how it will be received.

The result: every message is calculated before it's sent.

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PI = f(tone, intent, emotion)Score = 100 - risk

The formula behind every send

The SendPI Equation

PI Score=f(emotion, tone, intent, context)

emotion

15+ emotional signals detected

tone

7 tone dimensions analyzed

intent

12 receiver intents mapped

context

Profession & relationship aware

Communicating with people

You hit send 50+ times a day. Each time, you're gambling on how the other person will feel. SendPI removes the gamble. It predicts emotional reactions, detects passive-aggression, guilt-tripping, and over-apologizing — then rewrites your message to land exactly the way you intend.

Emotion detection works entirely offline — no internet required

PI ScorePI InsightPI RewritePI Mode

Communicating with machines

Bad instructions get bad answers. You have the idea, but turning it into a structured, expert-level AI cast is hard. PI Craft transforms your rough thoughts into precision casts for ChatGPT, Claude, Gemini, Perplexity, and any AI — so you always get the best output.

PI CraftMulti-AIPrecision CastsFirst 5 Free

THE 6 LAYERS

Everything SendPI can do

Six intelligence layers that cover every aspect of AI-powered communication — from emotional prediction to million-cast libraries.

PI Check

Know how your message lands before you send

Scores every message 0-100 for emotional impact. Detects passive-aggression, guilt-tripping, escalation, and over-apologizing in real-time. Shows exactly how the receiver will feel and rewrites to match your intended outcome.

Use cases

Email before sending to your boss

Slack messages to your team

Client proposals and negotiations

Investor updates

Cold outreach and follow-ups

PI Craft

Transform rough thoughts into precision AI casts

Takes your raw idea and restructures it into an expert-level cast optimized for your chosen AI platform. Platform-specific formatting for ChatGPT, Claude, Gemini, Perplexity, Copilot, Cursor, and Emergent.

Use cases

Turn "fix my code" into a structured debugging cast

Convert vague business ideas into strategic analysis requests

Transform simple questions into research-grade queries

Create role-specific casts (developer, marketer, analyst)

PI Cast

Generate complete casts from a single outcome

Describe the outcome you want and PI Cast generates a full, structured cast ready to paste into any AI. Supports 20+ categories from software engineering to healthcare to finance.

Use cases

Generate competitive analysis casts

Create landing page copy casts that convert

Build code review casts for specific frameworks

Draft legal document review casts

Produce marketing campaign strategy casts

Token Optimizer

Same result, fewer tokens, lower cost

Analyzes verbose casts and compresses them without losing meaning. Shows before/after token count and estimated cost savings. Essential for API-heavy workflows and production AI systems.

Use cases

Reduce API costs by 30-60%

Fit more context into token-limited models

Optimize casts for faster response times

Compress system casts for production deployment

PI Loop

Multi-pass refinement for maximum precision

Runs your cast through multiple AI refinement passes. Each iteration improves clarity, specificity, and structure. The AI critiques and improves its own output until the result is production-ready.

Use cases

Refine blog posts through 3 improvement passes

Polish investor pitch decks iteratively

Improve code architecture recommendations

Sharpen research methodology descriptions

PI Store

4.3 million precision casts ready to use

75 domains, 30 task types, 6 AI platforms, 20 professional roles, 16 specifics — every combination pre-generated with platform-specific formatting. Browse, filter, hover-preview, and copy instantly.

Use cases

Find the perfect software engineering cast for Claude

Browse marketing casts optimized for ChatGPT

Copy legal analysis casts for Perplexity with citations

Access 57,600 casts per domain package

Filter by task: write, analyze, debug, brainstorm, plan, and 25 more

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π is everywhere. Now it's in your communication.

Just as π is the hidden constant in every circle, SendPI is the hidden intelligence in every message.

C = 2πr

Precision

π calculates the exact circumference of any circle. SendPI calculates the exact emotional impact of any message.

eⁱπ+1=0

Elegance

Euler's identity connects five fundamental constants in one equation. SendPI connects emotion, tone, intent, and context in one score.

π = ∞

Infinite depth

π never ends or repeats. Human communication has infinite nuance. SendPI captures nuances that grammar tools completely miss.

The Vision

Every interaction deserves precision.

Billions of messages.
Zero prediction.

Every day, billions of messages are sent without any understanding of how they'll be received. A misread tone can lose a deal. A vague AI instruction can waste an hour.

Grammar tools fix spelling. AI writes for you. But nothing tells you how your words will actually land — until now.

SendPI exists to make sure
you never send blindly again.

People

Predict. Detect. Rewrite.

Predict emotional reactions before sending. Detect passive-aggression, guilt-tripping, and 15+ hidden signals. Rewrite with 10 tones and 30+ intents to land exactly the way you mean.

Machines

Structure. Optimize. Deliver.

Transform rough ideas into precision casts for ChatGPT, Claude, Gemini, Copilot, and any AI — so you always get the best output.

Clarity. Confidence. Intent.

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