Express Logic
Express Logic, founded in 1997 and acquired by Microsoft in 2019, developed the ThreadX real-time operating system and embedded middleware suite (NetX Duo, FileX, GUIX, USBX, LevelX) for resource-constrained 32-bit microcontrollers; the technology, now Eclipse ThreadX under MIT license at the Eclipse Foundation, has shipped on over 12 billion devices.
- Company typePrivate
- Founded1997
- HeadquartersSan Diego, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Express Logic does
Express Logic, Inc. was a privately held US software company founded in 1997 that developed ThreadX, a small, high-performance real-time operating system (RTOS) for resource-constrained 32-bit microcontroller devices. Over more than two decades the ThreadX RTOS was deployed on more than 12 billion devices worldwide, shipping as a commercial embedded development suite paired with a tightly integrated middleware stack: NetX Duo for embedded TCP/IP networking, FileX for embedded file systems, GUIX for embedded graphical user interfaces, USBX for USB host/device stacks, and LevelX for NAND/NOR flash wear-leveling. The offering targeted embedded device manufacturers building IoT and safety-critical products, with embedded software developers as a secondary persona, and was differentiated by reliability, deterministic performance, broad 32-bit MCU support, and what the company positioned as the first vendor-neutral, open-source safety-certified RTOS for safety-critical applications.
In April 2019 Microsoft acquired Express Logic and folded ThreadX into the Azure RTOS product suite, at which point Express Logic ceased operating as an independent entity. In November 2023 Microsoft announced the contribution of Azure RTOS to the Eclipse Foundation, rebranding the project as Eclipse ThreadX; the transition was completed in April 2024 with the release of Eclipse ThreadX 6.4.1 under the permissive MIT license, available to developers globally via threadx.io. The post-transition business model for the technology is open-source community-driven distribution through the Eclipse Foundation with ecosystem support from partners including STMicroelectronics (STM32 MCU integration), Witekio/Avnet (embedded software services), Cypherbridge Systems (SDKPac solutions), and PX5. Microsoft continues to supply ongoing safety and security certifications to enable continuity for safety-critical deployments. As a result, Express Logic today is best understood as a historical corporate vehicle for the ThreadX technology line, which now operates as an Eclipse Foundation open-source project rather than a licensable commercial product.
Express Logic firmographics
Firmographics- Name
- Express Logic
- Legal name
- Express Logic, Inc.
- Website
- https://rtos.com
- Company type
- Private
- Founded year
- 1997
- Operating status
- Acquired
- Headcount range
- 11–50 employees
- Short description
- Express Logic, founded in 1997 and acquired by Microsoft in 2019, developed the ThreadX real-time operating system and embedded middleware suite (NetX Duo, FileX, GUIX, USBX, LevelX) for resource-constrained 32-bit microcontrollers; the technology, now Eclipse ThreadX under MIT license at the Eclipse Foundation, has shipped on over 12 billion devices.
- Ownership category
- akta.pro rank
Where Express Logic is headquartered
LocationHeadquarters
- HQ city
- San Diego
- HQ country
- United States
- HQ region
- North America
Markets served
Express Logic business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Operations
Revenue model
- Open Source (formerly Commercial RTOS): Originally a commercial RTOS product sold by Express Logic to embedded developers and manufacturers. Post-acquisition by Microsoft and transition to Eclipse Foundation, now available free under MIT license.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Pay-as-you-go | Free open source tier |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels2 records
Express Logic product offering
Product offeringCore offering
Express Logic developed and sold ThreadX, a small-footprint real-time operating system providing reliable, ultra-fast performance for resource-constrained 32-bit microcontroller devices. The offering was bundled with a middleware suite—NetX Duo, FileX, GUIX, USBX, and LevelX—covering networking, file systems, graphical UI, USB, and flash memory wear-leveling. Originally a commercial product, ThreadX is now distributed as Eclipse ThreadX under the MIT license via the Eclipse Foundation.
Product overview
Express Logic's product portfolio is a comprehensive embedded development suite centered on the ThreadX real-time operating system, which has been deployed on more than 12 billion devices worldwide. Originally part of Microsoft Azure RTOS, ThreadX is now transitioning to open-source as Eclipse ThreadX under the Eclipse Foundation. The suite includes ThreadX as the core RTOS along with middleware modules: NetX Duo (networking), FileX (file system), GUIX (graphics/UI), USBX (USB), and LevelX (flash memory). The offering is a platform-plus-modules architecture targeting resource-constrained 32-bit microcontroller applications across safety-critical industries.
Differentiator
Problem solved
Functional benefit
Products and services
- ThreadX (Eclipse ThreadX) A small-footprint, high-performance real-time operating system providing reliable, ultra-fast performance for resource-constrained 32-bit microcontroller devices. Trusted by developers and manufacturers for over two decades, with deployments on more than 12 billion devices worldwide. Now distributed as Eclipse ThreadX under the MIT license via the Eclipse Foundation.
- NetX Duo Embedded TCP/IP network stack for ThreadX, providing dual IPv4/IPv6 networking capabilities for connected embedded devices.
- FileX Embedded file system for ThreadX, providing FAT-compatible file system support for resource-constrained devices.
- GUIX Embedded graphical user interface library for ThreadX, enabling development of GUIs on resource-constrained microcontroller devices.
- USBX Embedded USB host and device stack for ThreadX, providing USB connectivity for embedded devices.
- LevelX NAND/NOR flash wear-leveling file system for ThreadX, extending flash memory longevity and reliability in embedded devices.
Quantifiable outcome
- Deployed on more than 12 billion devices worldwide
Companies that use Express Logic
Customer profileSegments2 records
Ideal customer profiles2 records
Express Logic technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature7 records
Express Logic partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered core and flagship.
- Eclipse FoundationcoreEclipse Foundation serves as the new home and steward for Eclipse ThreadX open source project. As the recognized leader in hosting open-source IoT projects, Eclipse Foundation provides vendor-neutral governance and community collaboration for the ThreadX ecosystem. The foundation enables continued safety and security certified releases.
- STMicroelectronicsflagshipSTMicroelectronics provides Eclipse ThreadX and middleware as part of their STM32 ecosystem development environment. Their STM32 developers gain full range of support and choice through the ThreadX integration. Daniel Colonna, Director General-Purpose MCU Marketing at STMicroelectronics, expressed support for the open source transition as part of their continuous efforts to bring innovative software solutions to STM32 developers.
- Witekio (Avnet Company)coreWitekio brings comprehensive software capabilities and embedded hardware understanding to collaborate on Eclipse ThreadX project. CEO Samir Bounab cited 20 years of industry experience enabling OEMs to build next generation smart connected devices. Witekio contributes expertise to the open source community effort.
- Cypherbridge SystemscoreCypherbridge Systems delivers their SDKPac solutions on the ThreadX platform and is well-positioned to contribute to the project's long-term evolution under Eclipse Foundation stewardship. President Steve DeLaney expressed excitement about joining the Eclipse ThreadX ecosystem launch and exploring new opportunities.
- PX5corePX5 President William Lamie, a key figure in the RTOS industry, expressed full support for Eclipse Foundation in the ThreadX open source endeavor. Lamie noted that Microsoft's contribution makes one of the best commercial RTOS free for all developers to use.
Scale indicators1 record
Recent moves5 records
Expansion highlights4 records
Express Logic competitors and assessment
Company assessmentMarket position
Weaknesses4 records
Competitive moat3 records
Customer concentration
Express Logic social profiles
Digital presenceExpress Logic financial estimates
Financial estimateRevenue estimate
Valuation estimate
Express Logic leadership team
Management profileNumber of profiles
Express Logic funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Express Logic M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Express Logic
What does Express Logic do?
Express Logic developed and sold ThreadX, a small-footprint real-time operating system providing reliable, ultra-fast performance for resource-constrained 32-bit microcontroller devices. The offering was bundled with a middleware suite—NetX Duo, FileX, GUIX, USBX, and LevelX—covering networking, file systems, graphical UI, USB, and flash memory wear-leveling. Originally a commercial product, ThreadX is now distributed as Eclipse ThreadX under the MIT license via the Eclipse Foundation.
Is Express Logic a public or private company?
Express Logic is a private company. It is classified as corporate owned and is currently acquired.
When was Express Logic founded?
Express Logic was founded in 1997. It employs 11 to 50 people.
Where is Express Logic based?
Express Logic is headquartered in San Diego, United States, in the North America region.
How does Express Logic make money?
One revenue line is on record: open Source (formerly Commercial RTOS).
Does Express Logic have an API?
No public API is recorded for Express Logic.