StackTools vs Mastros

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

StackTools compared with Mastros
Detail	StackTools	Mastros
What it does	Private browser tools for everyday work	Privacy-first Chrome extensions that export chat and social media data to spreadsheets
Stage	Not given	Startup
Founded	Not given	2026
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	Free: 100 profiles and 100 messages per month (WhatsApp), or 250 profiles and 300 messages per month (Telegram), or 250 records (LinkedIn). Instagram and TikTok free and unlimited in beta. Pro: $9/month with 5,000 profiles and 10,000 messages per month (WhatsApp), or 5,000 records (LinkedIn). Scale:
Key features	PDF merge, split and compress Convert Word, Excel, images to PDF OCR, redact and protect PDFs Compress images (JPG, PNG, WebP, AVIF) Convert HEIC images Background removal On-device image upscale Works offline after first load No signup required	Export group members and chat messages to CSV, JSON or JSONL Bulk media download from chats Export LinkedIn searches with Sales Navigator support Extract email and website from Instagram and TikTok bios Calculate exact TikTok engagement rates Process all data in the browser with no server involvement Read-only with no automation or message sending
What makes it different	Files process in your browser with no uploads to servers No account, no credit card, no friction Works offline after first visit	Works with no account creation, API key or password required Reads only visible data; cannot reveal hidden information or deleted messages Five tools with the same pricing model and interface Instagram and TikTok extensions are free and unlimited during beta
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	8 no change since last check	35 no change since last check
Trust Flow (Majestic)	4	10
Citation Flow (Majestic)	14	28
Referring domains (Majestic)	4	54

4 details filled in for both companies.

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