Study Viewer

Study Viewer

Select items

Study Viewer Your study library

Study Viewer v3.18

Private Space

Your study library

Videos, notes & practical books

organised in one clean place.

Directories

Hold to reorder

Folder

Hold to move

Folders

Content

This directory is empty Tap the '+' button to add a sub-folder, video, note or PDF.

Add to Directory

New Directory

Directory Name

New Text Note

Note Title *

Content

Upload PDF

Choose File *

Title *

Online PDF

Paste PDF Link *

Cover Image (optional)

Title of PDF *

Made by panthera store © 2026 Ayush Tiwari · All rights reserved · Privacy

Playing Video

Video

Private Notes (Auto-saves)

Note

Text Note

Critical Warning

Welcome to Study Viewer. This app stores data locally to ensure blazing fast performance without servers.

Do NOT clear your browser data. Clearing cache/storage will delete all your folders, links, and notes.

Open Settings and export a backup to keep your data safe on your device.

Settings

Appearance

System follows your phone's light / dark setting.

Data & Backup

Back up regularly. Share the .txt file with friends to send them your study library. When you restore a backup you choose, library by library, whether to add it as new, merge it into one you already have, update it or skip it. Nothing on your device is deleted by an import. Older .json and .svbackup files still work.

Application

Privacy PolicyOpens on Panthera Store

App version v3.18

Danger Zone

Erase everything?

Factory Reset will permanently erase all application data on this device:

All directories, sub-folders and links
Text notes, uploaded PDFs and online books
Everything inside Private Space, and its PIN

This cannot be undone. Export a backup first if you might need it again.

Exit Study Viewer?

Your library, notes and files are saved on this device.

How to use Study Viewer

Everything is stored on your device. Follow these steps to build your study library.

Create a directory
On the home screen tap the green + button, choose New Folder and give it a name such as “Physics Class 12”.
Add books & study material
Open a directory and tap +. You can add a YouTube video or playlist, a text note, an uploaded PDF, or an Online PDF link (optionally with a cover image).
Organise with sub-folders
Inside a directory, tap + → New Folder to nest folders, for example Lectures, Notes and Practicals.
Rename or delete
Tap the pencil on a directory or item, change the name and press Save Changes. You can also delete it from there.
Reorder directories
Touch and hold a card for half a second, then drag it to a new place. On a computer, drag the handle on the right.
Open a book
Online PDFs appear at the top of Home, grouped under the name of their directory. The first group is open; tap a group’s title to show or hide the rest. Tap Open on a book to read it in full screen.
Watch with notes
Open a video to write private notes beside it. They save automatically, and the video resumes where you stopped.
Timestamps & formatting
Tap Add time to insert the current video time, such as [12:34]. Tap a blue time to jump to that moment. Select any text to make it bold, underlined or highlighted. Web links in notes turn blue; tap one to open it.
Pick up where you left off
The last lecture you opened appears at the top of Home under Recently viewed. Tap Play to jump straight back into its folder and continue, or tap ✕ to remove the card.
Search and search history
Tap the search icon. Your recent searches appear right away; tap one to repeat it, ↖ to edit it, or ✕ to delete it. You can type words in any order, and if the first word finds nothing, the other words are tried. Clear everything from Settings → Clear search history, or turn saving off with Save search history.
Private Space
Open the menu and choose Lock / Private Space. Set a PIN, and everything inside stays hidden from Home. Private Space has its own backup and restore.
Back up and share
Menu → Settings → Export / Share Data Backup. To send just one library, tap the pencil on it and choose Export / share this library.
Restore or import
Menu → Settings → Restore from Backup. For every library in the file, choose to add it as new, merge it into a library you already have, update it, or skip it. Nothing on your device is deleted.
Install as an app
Tap Install Study Viewer in the menu. If your browser does not offer one-tap install, the install guide shows the exact steps.

Install Study Viewer

Your browser decides whether it can show an install prompt. If it doesn’t, add Study Viewer to your home screen manually:

Android · Chrome

Tap the menu at the top right.
Choose Install app (or Add to Home screen).
Confirm with Install. Study Viewer now opens from your home screen.

iPhone & iPad · Safari

Tap the Share button.
Scroll and choose Add to Home Screen.
Tap Add.

Computer · Chrome / Edge

Click the install icon at the right end of the address bar, or open the browser menu.
Choose Install Study Viewer.

Installed apps keep working offline for everything saved on your device.

Important information

Do not clear your browser data. Clearing cache or storage deletes all your folders, links and notes.

Study Viewer stores everything locally on this device — there is no server and no account.
Export a backup regularly from Settings, and keep the file outside the browser.
Your Private Space PIN is saved only on this device.
Recently viewed and search history also stay only on this device. They are not part of backups, and Private Space never saves search history.
Saved directories, notes and uploaded PDFs work offline. YouTube videos and online PDFs need an internet connection.

Lecture Monitor

What’s new

Study Viewer v3.18Select & delete, new type badges · everything below is live.

Select & delete New

Tap Select above your cards, then tap any cards to choose them. Use Select all, tap a card again to deselect it, and Delete to remove everything chosen in one go. Back or ✕ leaves selection.

Safe deleting New

Folders and large selections ask for confirmation first. After deleting, tap Undo within a few seconds to bring everything back.

New type badges New

Cards now show a coloured icon badge instead of text: Video, Note, Playlist, PDF and Online PDF are easy to tell apart at a glance.

Lecture Monitor

Open the menu → Lecture Monitor. See screen time, lecture time, a daily chart, streaks, best day, most-watched lectures and progress for every subject. Stored only on your device.

Done badge

Tap the badge on any video, playlist, live link, PDF or note to mark it as done. Tap again to undo. Folders show how many items inside are done.

Choose what you share

Backup / Share now asks which libraries to include, and whether to add your done marks and Lecture Monitor data. Importing a backup lets you choose too.

Smoother reordering

The card you lift keeps its rounded corners and soft shadow in light and dark mode.

Native scrollbars

Phones use the system scrollbar that fades away. Desktop gets a slim bar that follows your Light / Dark theme.

Earlier in v3.17

Reliable Back button: lecture, folder, parent, Home, then an Exit confirmation. Search jumps return to where you started.
Remembers your place: open folder and scroll position are kept.
Online PDFs: edit the link and cover image (upload or link, auto-compressed).
Carousel: drag, fling and stop it, with a gear-tick sound.
Import / Export are now in the + menu.
Cleaner look: new app icon, flat native design.

v3.16

Recently viewed card on Home, search history and smarter search.
Open links or search Google straight from the search screen.
Search button inside the video player.

v3.15

License sheet, polished Settings and Material 3 refinements.

About

Study Viewer

Version v3.18

Videos, notes & practical books — organised in one clean place.

Made by panthera store

DeveloperAyush Tiwari

Contactayushofficial2050@gmail.com

StudioPanthera Store

Based inKutch, Gujarat, India

FollowX Instagram

What’s new in v3.18

Select & delete: choose cards, Select all, deselect any, delete with Undo.
Type badges: coloured icons replace the text tags on cards.
Reliable Back button: lecture, folder, parent, Home, then an Exit confirmation. Search jumps return to where you started.
Remembers your place: scroll position and open folder are kept.
Online PDFs: edit the link and cover image (upload or link, auto-compressed).
Carousel: drag, fling and stop it, with a gear-tick sound.
Import / Export are now in the + menu.
Cleaner look: new app icon, flat native design.

Engineering the Digital Future.

Privacy Policy

© 2026 Ayush Tiwari. All rights reserved.

License & copyright

Study Viewer v3.18
Copyright © 2026 Ayush Tiwari (Panthera Store). All rights reserved.

Study Viewer is proprietary software. Its source code, design, icons, text and all other parts belong only to the developer, Ayush Tiwari.

You may use the app for your own personal study. Without prior written permission from the developer, no one may:

copy, clone or re-upload the app, in whole or in part;
modify it, make derivative works, or rebrand it;
sell, rent, sublicense or distribute it, or host it under another name;
reverse engineer or extract its code, design or assets for use elsewhere.

The software is provided “as is”, without warranty of any kind. The developer is not liable for any loss of data. Please keep regular backups.

For permission or licensing enquiries write to ayushofficial2050@gmail.com. The full text is in the LICENSE.txt file shipped with the app.

Read the Privacy Policy

Backup Received

A Study Viewer backup file was shared to this app. Where should it go?

Share backup

Choose what goes into the backup file. Anything you leave out stays only on this device.

Also include

Done marksYour green “done” badges on lectures, PDFs and notes. Lecture Monitor dataYour study time, streaks and watch history. Leave this off when sharing with a friend.

Import

Also import Lecture Monitor dataMerged into your own numbers. Your existing history is kept.

Add Study Material

YouTube Link (Video or Playlist)

Detected Video

Custom Title *

Edit Item

Title

PDF link

Cover image

Images are compressed automatically.

Private Space

Enter your PIN to continue

Delete items?

Action completed