Is "Substack Downloader – Video, Audio & Podcast MP4/MP3" on Chrome Web Store Safe to Install?
Substack Downloader is a fast, lightweight Chrome extension that lets you download Substack videos, audio posts, and podcasts directly to your device in MP4 and MP3 format. Built specifically for Substack, it ensures accurate detection and reliable downloads from video posts, audio newsletters, and podcast episodes — including premium content you already have access to. Unlike generic video downloader tools, Substack Downloader is engineered exclusively for the Substack platform. It works seamlessly with embedded Mux video streams, native Substack audio players, and dynamically loaded media across all Substack publications, including custom domains. 🚀 Key Features: 🎥 Download Substack Videos (MP4) • Download embedded Substack videos hosted on Mux • Save videos as standard, playable MP4 files • Supports high-quality downloads up to 1080p (Pro) 🔊 Download Substack Audio & Podcasts (MP3) • Download Substack audio posts and podcast episodes • Save audio as MP3 for offline listening • Fully compatible with native Substack audio players ☁️ Cloud Sync & Backup (Optional) • Connect Google Drive or Dropbox • Automatically upload downloaded files to the cloud • Keep your Substack media library backed up and accessible anywhere 🧠 Smart Substack Media Detection • Automatically detects video and audio players on Substack pages • Works with hidden players, lazy-loaded media, and deep-linked audio • Compatible with all Substack publications and custom Substack domains 📂 Batch Downloads for Substack Posts • Download all videos and audio from a page at once • View detected Substack media in the extension popup • Ideal for long newsletters, archives, and research workflows 📝 Advanced File Organization • Automatically name files using post titles • Organize downloads by publication name, year, or month • Custom file naming and folder structure support 🔐 100% Private & Local • Runs entirely inside your browser • No servers, no analytics, no tracking • No ads and no external services required • Your data and downloads stay on your device ⚡ How to Use Substack Downloader Method 1: Download from the Player 1. Open any Substack post with video or audio 2. Hover over the media player 3. Click the download button to save instantly Method 2: Batch Download 1. Click the extension icon in your browser toolbar 2. View all detected Substack videos and audio on the page 3. Click "Download All" to save everything at once 🔎 Supported Substack Downloads • Download Substack videos • Download Substack audio posts • Download Substack podcasts • Download Substack Mux video streams • Offline access to Substack media • Works on substack.com and custom Substack domains Substack Downloader is designed for readers, researchers, and creators who want offline access to Substack content they already have permission to view. Simple, reliable, and built exclusively for Substack.
Risk Assessment
Analyzed300 security findings detected across all analyzers
Chrome extension requesting 10 permissions
Severity Breakdown
Finding Categories
YARA Rules Matched
7 rules(180 hits)Requested Permissions
10 permissionsManage, modify, and monitor downloads
Access your identity and sign-in tokens
About This Extension
Detailed Findings
200 totalYARA Rule Matches
7 rulesIndicators of Compromise
Network indicators, suspicious strings, and potential IoCs extracted during analysis
All Indicators · 100
detected Domain: video.id XIOC detected Domain: video.id
extracted_from_files
detected Domain: ss-direct-download-btn.audio XIOC detected Domain: ss-direct-download-btn.audio
extracted_from_files
detected Domain: keys.cloud XIOC detected Domain: keys.cloud
extracted_from_files
detected Domain: downloaddelta.id XIOC detected Domain: downloaddelta.id
extracted_from_files
detected Domain: chrome.downloads.show XIOC detected Domain: chrome.downloads.show
extracted_from_files
detected Domain: message.data XIOC detected Domain: message.data
extracted_from_files
detected Domain: chrome.downloads.download XIOC detected Domain: chrome.downloads.download
extracted_from_files
detected IP: ed::bef XIOC detected IP: ed::bef
extracted_from_files
detected IP: ::bef XIOC detected IP: ::bef
extracted_from_files
detected Domain: detectedmedia.map XIOC detected Domain: detectedmedia.map
extracted_from_files
detected Domain: types.audio XIOC detected Domain: types.audio
extracted_from_files
detected Domain: types.video XIOC detected Domain: types.video
extracted_from_files
detected Domain: item.id XIOC detected Domain: item.id
extracted_from_files
detected Domain: audio.id XIOC detected Domain: audio.id
extracted_from_files
detected IP: d::bef XIOC detected IP: d::bef
extracted_from_files
detected URL: https://substack.com/api/v1'; XIOC detected URL: https://substack.com/api/v1';
extracted_from_files
detected URL: https://substack.com/$ XIOC detected URL: https://substack.com/$
extracted_from_files
detected URL: https://oztqexvwivgwakgavzoa.supabase.co'; XIOC detected URL: https://oztqexvwivgwakgavzoa.supabase.co';
extracted_from_files
detected URL: https://stream.mux.com/$ XIOC detected URL: https://stream.mux.com/$
extracted_from_files
detected URL: https://www.buymeacoffee.com/'; XIOC detected URL: https://www.buymeacoffee.com/';
extracted_from_files
detected URL: https://buy.stripe.com/4gMeVdfMG8kF97zbUN7Zu03'; XIOC detected URL: https://buy.stripe.com/4gMeVdfMG8kF97zbUN7Zu03';
extracted_from_files
detected URL: https://buy.stripe.com/eVq14n43Y9oJ2Jb3oh7Zu04'; XIOC detected URL: https://buy.stripe.com/eVq14n43Y9oJ2Jb3oh7Zu04';
extracted_from_files
detected URL: https://billing.stripe.com/p/login/6oUeVd7ga58t6Zr1g97Zu00'; XIOC detected URL: https://billing.stripe.com/p/login/6oUeVd7ga58t6Zr1g97Zu00';
extracted_from_files
detected URL: https://www.googleapis.com/drive/v3/files', XIOC detected URL: https://www.googleapis.com/drive/v3/files',
extracted_from_files
detected Domain: paginateditems.map XIOC detected Domain: paginateditems.map
extracted_from_files
detected URL: https://content.dropboxapi.com/2/files/upload', XIOC detected URL: https://content.dropboxapi.com/2/files/upload',
extracted_from_files
detected URL: https://content.dropboxapi.com/2/files/upload_session/start', XIOC detected URL: https://content.dropboxapi.com/2/files/upload_session/start',
extracted_from_files
detected URL: https://content.dropboxapi.com/2/files/upload_session/finish', XIOC detected URL: https://content.dropboxapi.com/2/files/upload_session/finish',
extracted_from_files
detected URL: https://content.dropboxapi.com/2/files/upload_session/append_v2', XIOC detected URL: https://content.dropboxapi.com/2/files/upload_session/append_v2',
extracted_from_files
detected URL: https://substack.com$ XIOC detected URL: https://substack.com$
extracted_from_files
detected URL: https://iina.io/ XIOC detected URL: https://iina.io/
extracted_from_files
detected URL: https://chromewebstore.google.com/publisher/neo-cortex-llc/u796c2dce8d71eb1062cca209ec50db80 XIOC detected URL: https://chromewebstore.google.com/publisher/neo-cortex-llc/u796c2dce8d71eb1062cca209ec50db80
extracted_from_files
detected URL: https://chromewebstore.google.com/detail/substack-downloader-%E2%80%93-vid/ciplbnnhcnnbihlmohbkncnpbanfoodg/reviews XIOC detected URL: https://chromewebstore.google.com/detail/substack-downloader-%E2%80%93-vid/ciplbnnhcnnbihlmohbkncnpbanfoodg/reviews
extracted_from_files
detected URL: https://www.buymeacoffee.com/neocortex XIOC detected URL: https://www.buymeacoffee.com/neocortex
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detected URL: https://cdn.buymeacoffee.com/buttons/v2/default-violet.png XIOC detected URL: https://cdn.buymeacoffee.com/buttons/v2/default-violet.png
extracted_from_files
detected URL: https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart', XIOC detected URL: https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart',
extracted_from_files
detected URL: https://www.googleapis.com/drive/v3/files?q=$ XIOC detected URL: https://www.googleapis.com/drive/v3/files?q=$
extracted_from_files
detected URL: https://oztqexvwivgwakgavzoa.supabase.co/* XIOC detected URL: https://oztqexvwivgwakgavzoa.supabase.co/*
extracted_from_files
detected URL: https://www.googleapis.com/* XIOC detected URL: https://www.googleapis.com/*
extracted_from_files
detected URL: https://content.dropboxapi.com/* XIOC detected URL: https://content.dropboxapi.com/*
extracted_from_files
detected URL: https://api.dropboxapi.com/* XIOC detected URL: https://api.dropboxapi.com/*
extracted_from_files
detected URL: https://*.substack-post-media.s3.amazonaws.com/* XIOC detected URL: https://*.substack-post-media.s3.amazonaws.com/*
extracted_from_files
detected URL: https://www.googleapis.com/auth/drive.file XIOC detected URL: https://www.googleapis.com/auth/drive.file
extracted_from_files
detected URL: https://www.videolan.org/ XIOC detected URL: https://www.videolan.org/
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detected Domain: themes.auto XIOC detected Domain: themes.auto
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detected Domain: keys.auto XIOC detected Domain: keys.auto
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detected Domain: history.map XIOC detected Domain: history.map
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detected Domain: entries.map XIOC detected Domain: entries.map
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detected Domain: 1.mp XIOC detected Domain: 1.mp
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detected URL: http://iptc.org/std/Iptc4xmpExt/2008-02-29/ XIOC detected URL: http://iptc.org/std/Iptc4xmpExt/2008-02-29/
extracted_from_files
detected URL: https://clients2.google.com/service/update2/crx XIOC detected URL: https://clients2.google.com/service/update2/crx
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detected Domain: keys.is XIOC detected Domain: keys.is
extracted_from_files
detected Domain: stream.mux.com XIOC detected Domain: stream.mux.com
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detected Domain: high.mp XIOC detected Domain: high.mp
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detected Domain: medium.mp XIOC detected Domain: medium.mp
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detected Domain: low.mp XIOC detected Domain: low.mp
extracted_from_files
detected Domain: buy.stripe.com XIOC detected Domain: buy.stripe.com
extracted_from_files
detected Domain: billing.stripe.com XIOC detected Domain: billing.stripe.com
extracted_from_files
detected Domain: videoinfo.id XIOC detected Domain: videoinfo.id
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detected Domain: data.name XIOC detected Domain: data.name
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detected Domain: data.author XIOC detected Domain: data.author
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detected Domain: metadata.author XIOC detected Domain: metadata.author
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detected Domain: data.author.name XIOC detected Domain: data.author.name
extracted_from_files
detected Domain: pagemetadata.author XIOC detected Domain: pagemetadata.author
extracted_from_files
detected Domain: downloads.map XIOC detected Domain: downloads.map
extracted_from_files
detected Domain: tab.id XIOC detected Domain: tab.id
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detected Domain: filtered.map XIOC detected Domain: filtered.map
extracted_from_files
detected Domain: www.dropbox.com XIOC detected Domain: www.dropbox.com
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detected Domain: date.now XIOC detected Domain: date.now
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detected Domain: result.name XIOC detected Domain: result.name
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detected Domain: result.id XIOC detected Domain: result.id
extracted_from_files
detected Domain: data.id XIOC detected Domain: data.id
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detected Domain: keys.date XIOC detected Domain: keys.date
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detected Domain: keys.pro XIOC detected Domain: keys.pro
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detected Domain: window.open XIOC detected Domain: window.open
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detected Domain: e.target XIOC detected Domain: e.target
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detected URL: https://www.dropbox.com/oauth2/authorize?client_id=$ XIOC detected URL: https://www.dropbox.com/oauth2/authorize?client_id=$
extracted_from_files
detected Domain: dataset.id XIOC detected Domain: dataset.id
extracted_from_files
detected Domain: interview-with-founder.mp XIOC detected Domain: interview-with-founder.mp
extracted_from_files
detected Domain: chromewebstore.google.com XIOC detected Domain: chromewebstore.google.com
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detected Domain: www.buymeacoffee.com XIOC detected Domain: www.buymeacoffee.com
extracted_from_files
detected Domain: cdn.buymeacoffee.com XIOC detected Domain: cdn.buymeacoffee.com
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detected Domain: window.location.search XIOC detected Domain: window.location.search
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detected Domain: tabbtn.click XIOC detected Domain: tabbtn.click
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detected Domain: accounttab.click XIOC detected Domain: accounttab.click
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detected Domain: btn.dataset.tab XIOC detected Domain: btn.dataset.tab
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detected Domain: api.dropboxapi.com XIOC detected Domain: api.dropboxapi.com
extracted_from_files
detected Domain: substack-post-media.s3.amazonaws.com XIOC detected Domain: substack-post-media.s3.amazonaws.com
extracted_from_files
detected Domain: 869550188885-29cvn01305bq77rf17ak51bg3r8efmpd.apps.googleusercontent.com XIOC detected Domain: 869550188885-29cvn01305bq77rf17ak51bg3r8efmpd.apps.googleusercontent.com
extracted_from_files
detected Domain: li.limited XIOC detected Domain: li.limited
extracted_from_files
detected Domain: www.videolan.org XIOC detected Domain: www.videolan.org
extracted_from_files
detected Domain: iina.io XIOC detected Domain: iina.io
extracted_from_files
detected Domain: post-title.mp XIOC detected Domain: post-title.mp
extracted_from_files
detected Domain: itemstodownload.map XIOC detected Domain: itemstodownload.map
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detected Domain: m.id XIOC detected Domain: m.id
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detected Domain: ns.adobe.com XIOC detected Domain: ns.adobe.com
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detected Domain: iptc.org XIOC detected Domain: iptc.org
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detected Domain: cv.iptc.org XIOC detected Domain: cv.iptc.org
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detected Domain: oztqexvwivgwakgavzoa.supabase.co XIOC detected Domain: oztqexvwivgwakgavzoa.supabase.co
extracted_from_files
detected Domain: content.dropboxapi.com XIOC detected Domain: content.dropboxapi.com
extracted_from_files
Security Analysis Summary
Security Analysis Overview
Substack Downloader – Video, Audio & Podcast MP4/MP3 is a Chrome Web Store extension published by [email protected]. Version 1.1.3 has been analyzed by the Risky Plugins security platform, receiving a risk score of 100/100 (CRITICAL risk) based on 300 security findings.
Risk Assessment
This extension presents critical security risk. Severe issues were detected, potentially including malware indicators, exposed secrets, or dangerous behaviors. Installation is strongly discouraged until these issues are addressed.
Findings Breakdown
- Critical: 1 finding(s)
- High: 4 finding(s)
- Medium: 115 finding(s)
- Low: 180 finding(s)
What Was Analyzed
The security assessment covers multiple analysis categories:
- Malware Detection: YARA rule matching against 2,400+ malware signatures
- Secret Detection: Scanning for exposed API keys, tokens, and credentials
- Static Analysis: Code-level security analysis for common vulnerability patterns
- Network Analysis: Detection of suspicious network communications and endpoints
- Obfuscation Detection: Identification of code obfuscation techniques
Developer Information
Substack Downloader – Video, Audio & Podcast MP4/MP3 is published by [email protected] on the Chrome Web Store marketplace. The extension has approximately 969 users.
Recommendation
This extension is not recommended for installation without thorough manual review. Consider alternatives with lower risk scores, or contact the developer to address the identified security concerns.
Source Code Not Available
Source code is not available for this version of the extension.
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