Letterblack overview video thumbnail
CEP Extension for After Effects 2025+

AI-Powered Workflow
Docked in After Effects

Generate ExtendScript, analyze compositions with vision AI, and automate repetitive tasks — all from a professional panel that lives inside your workspace.

Download Letterblack View Documentation
Free tier available Bring your own API key Windows & macOS
Watch on YouTube
THE CHALLENGE

Motion Design Shouldn't Feel Repetitive

After Effects is powerful — but daily workflows are filled with manual, repetitive tasks that slow you down.

Panel Switching

Constantly jumping between Effects, Timeline, Project, and Script Editor breaks focus.

Scripting Overhead

Writing the same rename, organize, and batch scripts over and over for every project.

Error Debugging

Cryptic expression errors waste hours when you just need the animation to work.

Context Loss

Searching forums, documentation, and Stack Overflow — losing context every time you switch tabs.

LIVE PREVIEW

Try the Interface

Experience the Letterblack panel interactively — click the tabs to explore each feature

LETTERBLACK GEN-AI
Connected
How do I rename all layers to match their source files?

I can generate a script for that. Here's what it will do:

var comp = app.project.activeItem;
for (var i = 1; i <= comp.numLayers; i++) {
  comp.layer(i).name = comp.layer(i).source.name;
}
rename_layers.jsx
// Rename all layers to source file names
var comp = app.project.activeItem;
if (!comp) {
  alert("No composition selected");
  return;
}
app.beginUndoGroup("Rename Layers");
for (var i = 1; i <= comp.numLayers; i++) {
  var layer = comp.layer(i);
  if (layer.source) {
    layer.name = layer.source.name;
  }
}
app.endUndoGroup();

Layer Management

Rename to Source
Create Null Parent
Sequential Numbering

Effects & Presets

Apply Drop Shadow
Auto-Color Correct

Export & Render

Export Frame as PNG
Batch Render Comps
24
Scripts Run
2
Errors
158ms
Avg Execution
Recent Activity
✓ rename_layers.jsx executed successfully 2m ago
✕ Error: Layer not found at index 5 5m ago
✓ create_null_parent.jsx executed successfully 12m ago
AUDIO WALKTHROUGH

Listen to the Overview

Prefer to listen? We've created a 3-minute audio walkthrough explaining what Letterblack is, how it works, and who it's built for.

3:24 minutes • Narrated overview
0:00 / 3:24

Ready to play.

Open audio directly
THE SOLUTION

Seven Tools. One Docked Panel.

Letterblack is a professional CEP extension that brings AI-powered assistance directly into your After Effects workspace — no floating windows, no context switching.

  • AI Chat Panel — Ask questions, get answers without leaving After Effects
  • Self-Healing Scripts — If code fails, it automatically rewrites and fixes itself
  • Apply Effects — Type "add glow" and effects apply instantly (3x faster)
  • Script Generator — Generate ExtendScript and expressions from plain language
  • Project Memory — Save brand colors, client feedback, and project rules
  • Timeline Vision — AI sees your current frame, layers, and playhead position
  • Vision AI — Analyze composition screenshots with Claude/GPT-4V/Gemini
  • Script Library — Save and organize reusable scripts by category
  • Batch Processing — Apply changes to 50+ layers with one command
  • Telemetry Dashboard — Track errors, performance, and diagnostics
  • Safety Engine (LSBE) — Validates every action before execution
Script Library Panel
CORE CAPABILITIES

Professional Tools for Real Production

Built for motion designers, technical artists, and studios who need clarity, safety, and speed.

Context-Aware Chat

Enable context mode and the AI receives your composition metadata, selected layers, and After Effects version with every message.

Self-Healing Scripts

If generated code fails, Letterblack automatically detects the error and rewrites the script until it works. No debugging required.

Apply Effects Instantly

Type "add glow" or "apply drop shadow" — effects and presets are applied instantly via natural language. 3x faster than native panels.

Project Memory

Save client feedback, brand colors, and project rules into the Notebook. Letterblack remembers these details weeks later for consistency.

Timeline Vision

AI analyzes your current frame, layer stacking, and playhead position — providing context-aware suggestions and visual troubleshooting.

Vision AI Analysis

Screenshot your composition and ask questions. Vision models analyze your frames and provide feedback on layout, color, or technical issues.

Script Library

Organize scripts by category. Save common operations. Share across projects. Everything stored locally on your machine.

Batch Processing

Apply complex effect stacks or property changes to 50+ layers with a single command. Instant project-wide consistency.

Hybrid AI Engine

Smart routing between local models (fast, private) and cloud models (complex reasoning). Automatic cost optimization and offline support.

USE CASES

Built for Your Workflow

From solo creators to enterprise studios

Freelance Motion Designers

Speed up repetitive tasks like layer renaming, batch exports, and expression troubleshooting. Focus on creative work, not boilerplate scripting.

  • Generate scripts for one-off tasks
  • Ask quick questions without leaving AE
  • Build a personal script library
POPULAR

Technical Artists & Leads

Standardize workflows across teams. Provide pre-built scripts for junior artists. Track errors and performance issues before they become blockers.

  • Share script libraries with teams
  • Monitor telemetry across projects
  • Validate compositions with vision AI

Studios & Pipelines

Integrate AI-assisted workflows into After Effects pipelines. Reduce onboarding time. Maintain control with local-first architecture.

  • Deploy with team API keys or local AI
  • No external dependencies or subscriptions
  • Fully auditable script execution
TRUST & SECURITY

Built for Production Environments

Security, transparency, and control are core design principles

Safety Engine (LSBE)

Letterblack Security & Behavior Engine validates every action before it reaches After Effects. No metadata leaks, no destructive changes without consent.

6-Gate Release Pipeline

Every build passes 6 critical safety gates: Identity Lock, Artifact Completeness, Dev-Surface Elimination, CSP Posture, Capability Mapping, and License Stress Tests.

Local-First Privacy

Script library, project memory, and settings all live on your machine. Nothing is uploaded to external servers except your explicit AI prompts.