12 Days of Startups: A Dozen Of The Best And Most Exciting For December 2025

December is a time for reflection , but it also serves as a pivotal moment for planning ahead. As 2025 concludes, a new wave of startups is emerging, poised to influence the future of technology, business, and daily life.

These startups address global challenges, refine niche markets, and merge emerging technologies with practical solutions. Collectively, they represent the next phase of innovation.

This year’s 12 Days of Startups highlights twelve companies recognized in December 2025 for various reasons. These include sectors such as climate, sustainability, cybersecurity, payments, retail, sports, data, and space-related technology. The commonality among these companies lies in their focus on executing complex ideas into timely and relevant products. Some are rapidly scaling, while others remain under the radar, signaling potential trends for 2026.

Below is the complete list of the twelve startups featured in TechRound's 12 Days of Startups 2025:

Day 1: Planet Smart Day 2: Selene Day 3: SimSpace Day 4: Datactics Day 5: GlobalPR Day 6: Todyl Day 7: incentifi Day 8: SPORTL Day 9: JoinDig Day 10: LO:TECH Day 11: Oversecured Day 12: ATMO

Planet Smart, based in London, is a deep-tech startup focused on biomaterials for environmental sustainability. Its flagship product, PlanetSorb, is a biodegradable superabsorbent polymer designed to replace traditional plastics in various industries. In 2025, Planet Smart secured $1 million in pre-seed funding and initiated commercial trials. Plans for 2026 include expanding manufacturing capabilities.

Selene offers an AI-based customer engagement platform that delivers personalized messaging at scale. It optimizes communication strategies across multiple channels, enhancing customer engagement and lifetime value while reducing the need for manual marketing efforts.

SimSpace provides a cybersecurity platform for realistic cyber range simulations. The platform aids organizations in testing, assessing, and optimizing their cybersecurity measures. In 2025, SimSpace expanded its global presence and enhanced its AI capabilities.

Datactics Ltd. specializes in data quality and matching software for large datasets. The company supports regulatory compliance and data-driven initiatives, boasting significant revenue growth and sector expansion in 2025.

Global Talent PR offers media relations services for visa applications, including U.S. and UK talent visas. The firm expanded its revenue and services in 2025 and plans to enhance its UK visa support in 2026.

Todyl provides a unified cybersecurity platform for SMBs, integrating various security and compliance tools. The company ranked on the Deloitte Technology Fast 500 and Inc. 5000 in 2025 and plans to advance its platform in 2026.

incentifi is a wellness platform that rewards healthy behaviors with real-world incentives. After securing a £4 million pre-seed round in 2025, the company plans to launch a UK pilot program in 2026.

SPORTL offers a flexible fitness booking platform, enabling users to access gyms and classes without long-term commitments. The company plans a full London rollout and new partnerships in 2026.

JoinDig is an AI-powered shopping platform that helps users find deals on products. After strong growth in 2025, the company aims for further expansion in 2026.

LO:TECH is a digital asset trading firm that applies traditional financial standards to blockchain markets, offering services such as liquidity and market data.

Oversecured detects vulnerabilities in Android and iOS apps, reducing security review times. The platform works with various companies to secure applications before release.

ATMO, established in 2016, specializes in wearable air quality trackers like Atmotube PRO 2. The company focuses on providing health and wellness insights through environmental data.

Based on reporting by techround.co.uk.