StockAlert.pro vs OptionSpace

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

StockAlert.pro compared with OptionSpace
Detail	StockAlert.pro	OptionSpace
What it does	Real-time AI-powered stock alerts for price targets, technical signals, earnings and dividends	Volatility data and research tools powered by a market-maker-grade fitting and pricing engine
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Freemium	Freemium
Pricing	Free: Create up to 5 active alerts, 1 Premium-category alert, up to 2 watchlist stocks, unlimited email notifications. Premium: $19.99/month or save 17% with yearly billing - unlimited alerts, all alert categories, up to 100 watchlist stocks, 50 SMS alerts per month, unlimited API keys, 24/7 support	Free sample plan with no card required. Retail subscription available for individual personal use in the United States with daily limits on API credits. Institutional plans available at contact pricing for any business use with annual licenses invoiced monthly via ACH or wire. Higher-frequency data
Key features	26 alert types across 7 categories AI-generated stock analysis reports AI watchlist assistant with personalized recommendations Daily AI-powered stock screening Price checking every minute during market hours Email, SMS, browser push and webhook notifications Global stock exchange coverage API access for developers Slack and ChatGPT integration Multi-language support for international markets	Fitted volatility surfaces with bid-ask-weighted curves across every expiration Accounts for American-style options with early exercise, discrete dividends, and implied borrow rates One-minute granularity historical data across 140+ symbols spanning 10 years Realized volatility calculations from 385 intraday returns per day Vol Screener, Vol Premium, Skew Scanner, and Earnings Vol analysis tools Historical simulation using actual bid-ask prices and fitted vol surfaces Python package for research workflows Interactive visual dashboards for surface inspection and event studies Model Context Protocol (MCP) integration for AI agent workflows Greeks and constant-maturity metrics via API and dashboards
What makes it different	Largest alert type library with 26 types across technical, fundamental, and alternative data signals Real-time AI analysis with actionable recommendations Intelligent daily watchlist updates with automated signals Premarket and after-hours monitoring Free tier with 5 active alerts and full feature access	Arbitrage-free fitted volatility wings extending beyond quoted book using Lee-moment discipline Accessible to quantitative researchers and AI workflows through Python, API, and MCP without requiring market-maker infrastructure 10 years of consistent historical data at one-minute granularity across 140+ symbols for rigorous backtesting
Community votes	0	0
DR (Domain Rating by Ahrefs)	6 −2 (down) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	9	0
Citation Flow (Majestic)	10	0
Referring domains (Majestic)	86	0

5 details filled in for both companies.

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