Jason Frankel

Partner at Mainsail Partners

📍 San Francisco, California, United States🔄 Updated September 2026💼 15 investments📅 9 years investing🗓 Last invested Dec 2025𝕏 @upgrade_to_unlock
VC🌍 United StatesInvested this year
15
Total investments
1
Early stage
2
Mid stage
6
Late stage
9y
Years active

Portfolio

10 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Board Member
Dec 2025
Steelhead Technologies is a software company servicing the process manufacturing industry with an ultra modern solution to production and management. Our cloud based platform delivers high value, data driven results, and provides an organized and intuitive work environment for every employee. By digitizing the production process, our customers see immediate benefits in production, quality, and in reduced management burden. We are proud of the value our customers receive when they choose to use our product! The Steelhead team has experience in the manufacturing, engineering, industrial software, optimization, quality, cybersecurity and data management industries that provide a comprehensive solution for manufacturing management. This solution is continually improving with inputs from our growth partners. As a customer centric team, we are energized by each opportunity to develop our multifaceted software for a custom fit every time. Our team is based in Michigan and Minnesota, servicing powder coating, metal finishing, heat treating, casting and fabrication shops across the country.
Board Member
Oct 2025
CourtReserve powers racquet and paddle sports clubs across North America. From tennis to pickleball to padel, we’re the comprehensive platform to start, grow, and scale your facility. Built by club owners, for club owners, CourtReserve helps your entire team manage reservations, communication, payments, and more — all in one place. Launched in 2016, we now support 2,000+ active locations and over 5 million players across the racquet sports community. For every club, there’s CourtReserve™
Board Member
Mar 2025
ChiroHD is a cloud based EHR focusing on the Chiropractic space. We are a full featured Chiropractic software office management system with scheduling, texting, insurance management, integrated financials, care management
Board Member
Jul 2024
INNERGY is an ERP solution that drives the complete business process of custom woodworking shops. Our platform unifies the various islands of data spread across your organization into a single system, accessible from the office or field. The days of disjointed spreadsheets or niche applications that dont share data easily are gone!
Board Member
Jul 2023
ProShop is built by Adion Systems in Vancouver BC and supported by ProShop USA in Bellingham WA. Its a proprietary ERP, MES and QMS software package that was developed over 17 years while the owners were growing Pro CNC Inc., one of the largest machine job shops in the Pacific Northwest, culminating in a successful sale of the company in 2014. ProShop was born from the need to manage and understand the complex needs of manufacturing companies. It was designed by machinists, inspectors, CNC programmers, general managers, tooling crib staff, purchasing agents, quality managers, machine operators, ISO/AS quality system managers, customer service agents, CEO, sales managers, estimators, assemblers, CFO, receiving clerks, and everyone else that is critical to the smooth flowing operation of a manufacturing company. Never before has there been an ERP/MES/QMS solution that was born and bred as deeply integrated into the DNA of manufacturing companies as ProShop. Now focused exclusively on developing software solutions for the small to medium sized manufacturing company sector, the original founders of Pro CNC are bringing a revolutionary approach to the software needed to run a manufacturing company. Lets face it, traditional ERP software sucks! Even ERP systems that were supposedly designed for manufacturing companies still do a very poor job of it, requiring lots of other unrelated software and systems to run your manufacturing company. Whether you have a machine shop, fabrication, dedicated products, composites, or any other type of discrete manufacturing company, Adions software - ProShop will redefine and set a new bar for manufacturing software and completely change the way you think about your business and the software to run it most efficiently and profitably.
Board Member
Apr 2023
Teamfront is a strategic partner to founder-owned software companies that are market leaders in niche verticals. With a team composed of seasoned experts in vertical SaaS, we deliver comprehensive operational support, playbooks, and best practices while preserving culture and investing in teams. Our technology and unwavering commitment to being a customer-centric organization make us a trusted partner for bootstrapped founder-owned companies seeking operational expertise to drive growth through better experiences for their customers. We seamlessly integrate mission-critical core vertical software, payments processing, and digital marketing solutions, to deliver user-friendly, robust solutions tailored to the distinctive needs of over 3,000 small to mid-sized business owners. Join us in this journey where we navigate the dynamic tech landscape, driven by a spirit that doesnt quit and a belief that, together, we are stronger.
Board Member
Jan 2022
ServiceCore helps our customers Get More Done, and Stress Less. How? By supercharging their liquid waste or roll-off businesses with software that cuts wasted time, manages jobs, optimizes routes, tracks inventory, and automates billing. The result? More revenue, satisfied customers, and happy staff. Speaking of happy staff, ServiceCore employees are talented and driven, and we know how to have fun! We celebrate a judgment-free culture that encourages you to be your authentic self. And we provide ample opportunities to learn and grow in a place where you feel supported. We care deeply about our people (and pets!). Every member of the ServiceCore team participates in our equity appreciation program. We’re in this together! ServiceCore is backed by Mainsail Partners, a private equity firm that specializes in helping software companies like ours accelerate growth.
Board Member
Jul 2021
Centerbase is the most customizable, cloud-based legal practice management solution that gives mid-sized firms the power to streamline their daily tasks with ease and efficiency. Centerbase delivers the power of legacy systems with the flexibility of the cloud to modernize your firm without sacrificing functionality. To book a no obligation demo contact sales@centerbase.com or call us at (214) 987-9000. www.centerbase.com
Board Member
May 2019
Fullbay is cloud-based shop management software built specifically for heavy duty repair shops. We are changing the industry so shop owners and their technicians can get more done in less time and have a life outside the shop. For career opportunities, please visit fullbay.com/careers.
Board Member
Mar 2019
Since 2013, Aspire has helped revolutionize the landscape industry by empowering contractors to transform the way their businesses operate. Now, Aspire provides industry-leading software for field services businesses, trusted by contractors everywhere. Gain visibility, make better business decisions and increase your profits today.
Experience · 16 entries
All (16)
Investments (15)
Board (15)
2025
Board Member
Dec 2025
Steelhead Technologies is a software company servicing the process manufacturing industry with an ultra modern solution to production and management. Our cloud based platform delivers high value, data driven results, and provides an organized and intuitive work environment for every employee. By digitizing the production process, our customers see immediate benefits in production, quality, and in reduced management burden. We are proud of the value our customers receive when they choose to use our product! The Steelhead team has experience in the manufacturing, engineering, industrial software, optimization, quality, cybersecurity and data management industries that provide a comprehensive solution for manufacturing management. This solution is continually improving with inputs from our growth partners. As a customer centric team, we are energized by each opportunity to develop our multifaceted software for a custom fit every time. Our team is based in Michigan and Minnesota, servicing powder coating, metal finishing, heat treating, casting and fabrication shops across the country.
Board Member
Oct 2025
CourtReserve powers racquet and paddle sports clubs across North America. From tennis to pickleball to padel, we’re the comprehensive platform to start, grow, and scale your facility. Built by club owners, for club owners, CourtReserve helps your entire team manage reservations, communication, payments, and more — all in one place. Launched in 2016, we now support 2,000+ active locations and over 5 million players across the racquet sports community. For every club, there’s CourtReserve™
Board Member
Mar 2025
ChiroHD is a cloud based EHR focusing on the Chiropractic space. We are a full featured Chiropractic software office management system with scheduling, texting, insurance management, integrated financials, care management
2024
Board Member
Jul 2024
INNERGY is an ERP solution that drives the complete business process of custom woodworking shops. Our platform unifies the various islands of data spread across your organization into a single system, accessible from the office or field. The days of disjointed spreadsheets or niche applications that dont share data easily are gone!
2023
Board Member
Jul 2023
ProShop is built by Adion Systems in Vancouver BC and supported by ProShop USA in Bellingham WA. Its a proprietary ERP, MES and QMS software package that was developed over 17 years while the owners were growing Pro CNC Inc., one of the largest machine job shops in the Pacific Northwest, culminating in a successful sale of the company in 2014. ProShop was born from the need to manage and understand the complex needs of manufacturing companies. It was designed by machinists, inspectors, CNC programmers, general managers, tooling crib staff, purchasing agents, quality managers, machine operators, ISO/AS quality system managers, customer service agents, CEO, sales managers, estimators, assemblers, CFO, receiving clerks, and everyone else that is critical to the smooth flowing operation of a manufacturing company. Never before has there been an ERP/MES/QMS solution that was born and bred as deeply integrated into the DNA of manufacturing companies as ProShop. Now focused exclusively on developing software solutions for the small to medium sized manufacturing company sector, the original founders of Pro CNC are bringing a revolutionary approach to the software needed to run a manufacturing company. Lets face it, traditional ERP software sucks! Even ERP systems that were supposedly designed for manufacturing companies still do a very poor job of it, requiring lots of other unrelated software and systems to run your manufacturing company. Whether you have a machine shop, fabrication, dedicated products, composites, or any other type of discrete manufacturing company, Adions software - ProShop will redefine and set a new bar for manufacturing software and completely change the way you think about your business and the software to run it most efficiently and profitably.
Show all 16 entries ↓
Investment activity
2017–2025 · 15 investments
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