PromptSpend vs Vynix

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

PromptSpend compared with Vynix
Detail	PromptSpend	Vynix
What it does	LLM API cost calculator and comparison tool	Point-and-click visual website feedback for AI coding agents
Stage	Not given	Startup
Founded	Not given	2026
Based in	Not given	Not given
Pricing model	Open source	Freemium
Pricing	Free	Free: $0, always free with 1 project and 50 annotations per month. Pro: $7/seat/month (introductory pricing, regular price shown struck through) with unlimited projects and annotations, 500 AI credits/month, and 14-day free trial. Business: $15/seat/month (introductory pricing) with unlimited seats,
Key features	Estimate LLM API costs for 109 models Compare pricing across 16 providers Paste prompt and see cost comparison Free tier information for each model Optional email price alerts Data processed on device, not transmitted Available as native iPhone and Android apps Pricing API available VS Code extension	Point-and-click and region capture Live element inspector with CSS selectors and React/Vue components Structured DOM context with XPath and computed styles Runtime diagnostics: console errors and network requests Native MCP server for AI agent integration One-click GitHub issues with Copilot auto-assignment AI Diagnosis of root causes and fixes Read-only share links with privacy protection Markdown, AI prompt and JSON export formats Works on any framework with Shadow DOM isolation
What makes it different	Pricing automatically re-checked every morning against tracked sources Completely free with no accounts or ads required Pasted text stays on your device and is never transmitted Open source MIT licensed codebase Covers 109 models from 16 providers in a single comparison	Captures exact element selectors and DOM context instead of just screenshots Native MCP server allows agents to read feedback directly without copy-paste Privacy-first: metadata only, no request bodies, query strings stripped AI diagnosis suggests root causes, fixes and source files
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)	7 no change since last check	33 no change since last check
Trust Flow (Majestic)	3	9
Citation Flow (Majestic)	19	32
Referring domains (Majestic)	48	81

5 details filled in for both companies.

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