Castelion vs OpenGov
Side-by-side comparison of AI visibility scores, market position, and capabilities
Raised $350M Series B (Dec 2025). $50M US Navy contract for Blackbeard hypersonic prototyping. 1,000-acre solid rocket motor facility under construction.
About
Castelion is a defense startup developing the Blackbeard hypersonic missile system, one of the few startups with an active US Navy contract for hypersonic weapons full-scale prototyping and early operational fielding. The company raised $350 million in Series B financing in December 2025 and secured a $50 million US Navy contract for Blackbeard prototyping, directly addressing the DoD's urgency to field hypersonic strike capability as China and Russia have demonstrated operational hypersonic weapons.
San Francisco CA. Raised $250M+. Cloud software for government budgeting, permitting, and citizen services, serving 1,600+ government agencies across the US.
About
OpenGov is a San Francisco-based government cloud software company founded in 2012 that has raised over $250M in funding. The company provides an integrated suite of financial management, budgeting, permitting, licensing, and citizen services software to more than 1,600 local and state government agencies across the United States. OpenGov was founded on the premise that government agencies deserve modern, cloud-native software instead of legacy on-premise systems.\n\nThe platform covers the full government operations lifecycle from budget planning and financial reporting to building permits, business license issuance, and code enforcement case management. OpenGov's financial management module replaces outdated government accounting systems with a cloud-native general ledger, budget transparency tools, and performance reporting that helps governments communicate financial data to citizens and elected officials. The company acquired Cartegraph in 2021, adding asset management for government infrastructure.\n\nOpenGov targets county and city governments, special districts, and state agencies looking to modernize from legacy on-premise systems like Tyler Technologies' older products or proprietary COBOL-based accounting software. It competes with Tyler Technologies, Accela, and CivicPlus across its various product lines. OpenGov differentiates through its cloud-native architecture, its integrated platform across financial and citizen-facing services, and its strong transparency and open data features.
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