Callen-Lenz is the older company (2007 vs 2019); Callen-Lenz is the larger of the two.
Side-by-Side Comparison
| Metric | Callen-Lenz | Rain |
|---|---|---|
| Founded | ||
| Founded | 2007 older | 2019 |
| Headquarters | ||
| Headquarters | Salisbury, United Kingdom | Alameda, United States |
| Employees | ||
| Employees | 125 larger | 16 |
| Industry | ||
| Industry | Manufacturing, Space | Drones, Privacy and Security |
| Funding Stage | ||
| Funding Stage | Private Equity | Seed |
| Total Funding | ||
| Total Funding | Not tracked yet | $9.70M |
| Funding Rounds | ||
| Funding Rounds | Not tracked yet | 1 |
| Services | ||
| Services | Not tracked yet | Autonomous aerial systems for firefighting, Wildfire behavior analysis, Fire suppression strategy design, Integration with manned and unmanned aircraft, Advanced fire detection and response |
| Target Customers | ||
| Target Customers | Not tracked yet | Firefighting Agencies, Private Firefighting Operators, Government Emergency Services, Climate Policy Advocates, Wildfire Management Authorities |
| Taxonomy | ||
| Taxonomy | Uncrewed Aerial Systems, Aircraft Manufacturing, Avionics, Flight Testing, Systems Engineering, Rapid Prototyping, Autonomous Aircraft, Navigation Software, Communication Software, Technical Consultancy, Aviation Technology, Drone Technology, Operational Experience, Global Client Network, Cutting-edge Technologies | Autonomous Aircraft, Wildfire Suppression, Firefighting Technology, Fire Safety, Remote Firefighting, Uncrewed Aircraft Systems, Aerial Firefighting, Drone Technology, Fire Response Efficiency, Wildfire Response, Intelligent Aircraft, Firefighting Collaboration, Aerospace Innovation, Emergency Response Technology, Fire Mitigation Solutions |
| Website | ||
| Website | callenlenz.com | rain.aero |
About Callen-Lenz
Callen-Lenz is a market-leading UK SME providing operationally proven technological solutions, including bespoke aircraft, rapid prototyping, upgrades, software, and avionics, as well as complementary technical consultancy for crewed and uncrewed aviation. The design, development, and manufacturing...
About Rain
Rain, founded in 2019 and headquartered in Alameda, California, is a pioneering startup at the intersection of the Drones and Privacy and Security sectors. Its slogan, "Every wildfire starts small," succinctly encapsulates its mission to combat wildfires with advanced technology. The company has de...
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Funding, hiring, leadership and stack changes at Callen-Lenz and Rain — by email.
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Compiled from the BounceWatch company index. We last looked at Rain on 19 Jan 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.