T-Viewer

T-Viewer is a free companion app for LSP D-Planner+. It opens, reads, edits, styles, and shares exported dive-plan TXT and PDF files on your phone, tablet, or desktop browser.

Live app: https://threecats-lsp.com/t-viewer/
Android APK: https://threecats-lsp.com/t-viewer/download.html
Repository: https://github.com/Three-Cats-LSP/T-Viewer
Toolkit hub: https://threecats-lsp.com
License: MIT

What It Is For

LSP D-Planner+ exports dive plans as text, slate text, and PDF. T-Viewer is the viewer/editor for those files.

Use it when you want to:

open an exported dive plan on a phone;
keep a readable deco slate;
share a plan with a buddy or surface support;
adjust text formatting and colors for readability;
read PDF exports without leaving the toolkit.

T-Viewer does not calculate decompression. It is a viewer and editor only.

Three Cats LSP Toolkit

App	Purpose	Live app
LSP D-Planner+	OC, CCR, pSCR, rec and tech decompression planning	https://threecats-lsp.com/d-planner-plus/
T-Viewer	Dive-plan TXT/PDF viewer and editor	https://threecats-lsp.com/t-viewer/
Get In Water	Dive trip packing lists and exportable checklists	https://threecats-lsp.com/get-in-water/

Features

File Support

Opens .txt, .log, .plan, .div, and .pdf.
Receives shared files from LSP D-Planner+ on Android.
Supports desktop drag and drop in the browser.
Can copy, edit, save, download, and share text files.
Displays PDF exports with in-app PDF navigation.

Dive-Plan Text View

Syntax highlighting for common dive-plan structure.
Distinct styling for headers, parameters, schedule rows, separators, and warnings.
Horizontal scrolling for monospaced tables so slate rows stay aligned.
Font-size control with pinch-to-zoom on touch devices.
Light and dark themes.

Editing And Sharing

Edit exported text plans.
Save edited text back to the device.
Copy full text to the clipboard.
Share through Android or browser share targets.
Keep settings in local browser storage.

Appearance

Font selector for the content area.
Customizable colors for dark and light themes.
Reset controls for theme colors.
Mobile-friendly toolbar.

Install

Web / PWA

Open:

https://threecats-lsp.com/t-viewer/

Install from your browser:

Platform	Install path
iPhone / iPad Safari	Share -> Add to Home Screen
Android Chrome	Menu -> Install app or Add to Home Screen
Desktop Chrome / Edge / Vivaldi	Install icon in address bar

Android APK

Download:

https://threecats-lsp.com/t-viewer/download.html

Requirements:

Android 5.0+ / API 21+
Allow "Install unknown apps" for your browser or file manager

Typical Workflow

Build a dive plan in LSP D-Planner+.
Export it as TXT or PDF.
Open or share the file into T-Viewer.
Adjust font, theme, or colors if needed.
Share the final plan with your team.

Safety Notice

T-Viewer does not validate or calculate dive plans. It only displays and edits files. Always verify dive plans independently with your training, tables, dive computer, and team procedures.