> ## Documentation Index
> Fetch the complete documentation index at: https://support.tuckthis.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Tuck architecture

> Understand the separation between the encrypted client and hosted services.

Tuck separates the capture client from the services that make accounts, ingest, reminders, billing, flags, and telemetry work.

| Service | Primary responsibility |
| - | - |
| Web client | Capture, vault, local data, editing |
| Identity | Accounts, sessions, encrypted snapshots, share snapshots |
| Ingest | Email, SMS, API capture and reminder delivery |
| Billing | Trials and paid entitlements |
| Flags | Feature evaluation by plan |
| Telemetry | Lightweight product events |
| Backoffice | Human operations for accounts and usage |

There is intentionally no single server-side service that needs unrestricted access to plaintext vault content.

## Design principle

Keep adapters at the edge. Email delivery, SMS delivery, billing, and cloud hosting can change without redefining the vault format.