StackTools vs CardGo.AI

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 CardGo.AI
Detail	StackTools	CardGo.AI
What it does	Private browser tools for everyday work	AI context cards for ChatGPT, Claude, Gemini, Perplexity and Grok
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	Free plan: $0 forever, 7 cards, CardGo AI: 10 messages and 10 hosted analyses a day. Pro plan: $9.90 per month, 50 cards, CardGo AI: 100 messages and 100 hosted analyses a day. Max plan: $19.90 per month, Unlimited cards, CardGo AI: 300 messages and 300 hosted analyses a day.
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	Save context once as encrypted cards with seven sections End-to-end encrypted with AES-256-GCM Works with ChatGPT, Claude, Gemini, Perplexity and Grok Sync across devices Card suggestions while typing Create multiple context cards with different details Filter sensitive details before sharing Dream cards feature to auto-generate card suggestions
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	One card works across five different AI services Eliminates need to re-explain context to each AI chat No credit card required to start Context attached only when you choose
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	3 no change since last check
Trust Flow (Majestic)	4	0
Citation Flow (Majestic)	14	26
Referring domains (Majestic)	4	41

4 details filled in for both companies.

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