S3 Connected Health vs Flex Health Solutions: full comparison for 2026
Quick verdict
S3 Connected Health (4.2/5) edges ahead of Flex Health Solutions (3.8/5) overall. S3 Connected Health is the better choice for pharma companies adding connectivity to drug delivery. Flex Health Solutions is the stronger option for design transfer into global contract manufacturing. The right choice depends on your project size, budget, and required tech stack.
S3 Connected Health vs Flex Health Solutions: head-to-head summary
| Criterion | S3 Connected Health | Flex Health Solutions |
|---|---|---|
| Founded | 2001 | 1969 |
| HQ | Dublin, Ireland | Austin, TX, USA / Singapore |
| Team size | 200–300 | Large (Flex Ltd.) |
| Rating | 4.2 / 5 | 3.8 / 5 |
| Primary differentiator | Combines embedded wireless engineering with patient-facing apps and data platforms for pharma programs | Dedicated NPI center and design sites that feed directly into Flex's medical manufacturing network |
| Pricing model | Fixed project, time and materials, managed service | Manufacturing supply agreement, NPI contract |
| Min. engagement | Not disclosed | Not disclosed |
| Primary tech stack | BLE, Embedded C/C++, iOS | PCB assembly, Injection molding, Automated assembly |
| Industries served | Drug delivery, Digital health, Wearables & remote monitoring | Drug delivery, Diagnostics & lab devices, Surgical & therapeutic devices |
S3 Connected Health vs Flex Health Solutions: overview
S3 Connected Health
S3 Connected Health is the connected health business of Dublin's S3 Group (Silicon & Software Systems), which dates to 1986; the connected health unit itself is listed as founded around 2001. After the group sold its semiconductor unit to Adesto, it concentrated on this business. It works with pharma and medtech companies on connected drug delivery, SaMD, IoMT platforms, wireless connectivity and data security, and partnered with Ypsomed on connected injection devices. Employee figures range from about 200 to 300.
Flex Health Solutions
Flex Health Solutions is the healthcare division of Flex Ltd. and operates as a contract development and manufacturing organization (CDMO) for medical devices and pharma. Flex lists 26 manufacturing sites, six design and engineering sites, 16 FDA-registered entities and 21 ISO 13485 sites for health (per company website; independently unverifiable). In 2025 it opened a North American new product introduction (NPI) center for healthcare customers, and it shared a 2025 PDA Drug Delivery Innovation Award with Merck KGaA for an autoinjector.
Services and capabilities: S3 Connected Health vs Flex Health Solutions
| Capability | S3 Connected Health | Flex Health Solutions |
|---|---|---|
| Electronics & PCB design | ✗ | ✓ |
| Firmware & embedded software | ✓ | ✗ |
| SaMD & companion apps | ✓ | ✗ |
| Connected devices & IoT | ✓ | ✗ |
| Industrial design & human factors | ✗ | ✗ |
| Mechanical engineering | ✗ | ✓ |
| Device cybersecurity | ✓ | ✗ |
| Regulatory & QMS support | ✓ | ✓ |
| Manufacturing & scale-up | ✗ | ✓ |
Tech stack comparison: S3 Connected Health vs Flex Health Solutions
| Framework / platform | S3 Connected Health | Flex Health Solutions |
|---|---|---|
| Embedded C/C++ | ✓ | N/A |
| Embedded Linux | N/A | N/A |
| RTOS | N/A | N/A |
| BLE | ✓ | N/A |
| Cloud (AWS/Azure) | ✓ | N/A |
| IEC 62304 | ✓ | N/A |
| ISO 14971 | N/A | N/A |
| ISO 13485 QMS | N/A | ✓ |
| Qt | N/A | N/A |
Pricing comparison: S3 Connected Health vs Flex Health Solutions
| Criterion | S3 Connected Health | Flex Health Solutions |
|---|---|---|
| Minimum engagement | Not disclosed | Not disclosed |
| Engagement models | Dedicated team, Fixed project, Time & materials | Fixed project, Manufacturing contract |
| Rate transparency | Not public | Not public |
| Price tier | Mid-market | Mid-market |
Target audience comparison: S3 Connected Health vs Flex Health Solutions
| Dimension | S3 Connected Health | Flex Health Solutions |
|---|---|---|
| Best company size | Startup to mid-market | Startup to mid-market |
| Best industries | Drug delivery, Digital health, Wearables & remote monitoring | Drug delivery, Diagnostics & lab devices, Surgical & therapeutic devices |
| Best use cases | Adding Bluetooth connectivity to an autoinjector, Building a patient adherence app and backend | Transferring a verified design into volume production, Pre-clinical and design verification builds |
| Typical project type | Dedicated team | Fixed project |
S3 Connected Health vs Flex Health Solutions: pros and cons
| S3 Connected Health | |
|---|---|
| + | Long experience in wireless and embedded software from its S3 Group background |
| + | Works directly with pharma on connected injectors and inhalers, such as the Ypsomed partnership |
| + | Covers apps, cloud and the device connectivity module |
| + | Delivery team includes a site in Poland, which helps with cost |
| - | Founding date and history are tangled with the wider S3 Group, so check which entity you contract with |
| - | Not a mechanical or industrial design firm |
| - | Pharma focus means pure medtech hardware projects are less common |
| Flex Health Solutions | |
|---|---|
| + | Large global network of ISO 13485 and FDA-registered sites |
| + | New NPI center supports prototype builds, design verification and production transfer |
| + | Award-winning drug delivery work with Merck KGaA |
| + | Handles sterilization and packaging in-house |
| - | Development work mainly exists to feed programs into Flex factories |
| - | Better for funded programs with a clear path to volume |
| - | Site counts are company-reported and differ across Flex pages |
Who should choose S3 Connected Health?
A typical fit: adding Bluetooth connectivity to an autoinjector.
Combines embedded wireless engineering with patient-facing apps and data platforms for pharma programs. Minimum engagement is not publicly disclosed. Works best with clients in Drug delivery, Digital health, Wearables & remote monitoring.
Who should choose Flex Health Solutions?
A typical fit: transferring a verified design into volume production.
Dedicated NPI center and design sites that feed directly into Flex's medical manufacturing network. Minimum engagement is not publicly disclosed. Works best with clients in Drug delivery, Diagnostics & lab devices, Surgical & therapeutic devices.
Decision matrix: S3 Connected Health vs Flex Health Solutions
| Your situation | Recommended choice |
|---|---|
| You need full-ownership delivery on a defined project scope | S3 Connected Health |
| You need a large dedicated team for an ongoing programme | S3 Connected Health |
| Your budget is at the lower end | Compare: S3 Connected Health (Not disclosed) vs Flex Health Solutions (Not disclosed) |
| You need specialist depth in a specific vertical | S3 Connected Health |
| You need staff augmentation or team extension | Neither; consider alternatives that offer staff aug |
| You need consulting before committing to a build | Both may offer discovery engagements |
Use case fit: S3 Connected Health vs Flex Health Solutions
| Use case | S3 Connected Health fit | Flex Health Solutions fit | Winner |
|---|---|---|---|
| Adding Bluetooth connectivity to an autoinjector | Strong | Limited | S3 Connected Health |
| Building a patient adherence app and backend | Strong | Limited | S3 Connected Health |
| Transferring a verified design into volume production | Limited | Strong | Flex Health Solutions |
| Pre-clinical and design verification builds | Limited | Strong | Flex Health Solutions |
Verdict: S3 Connected Health vs Flex Health Solutions
S3 Connected Health (4.2/5) is the stronger overall choice for most Medical Device Development projects. Combines embedded wireless engineering with patient-facing apps and data platforms for pharma programs.
Flex Health Solutions (3.8/5) is worth a look if you need pre-clinical and design verification builds. If your situation matches that, Flex Health Solutions is a competitive option.
Related comparisons
S3 Connected Health vs Flex Health Solutions FAQ
Is S3 Connected Health better than Flex Health Solutions?
S3 Connected Health (4.2/5) scores higher overall, but "better" depends on your use case. S3 Connected Health's strongest advantage: long experience in wireless and embedded software from its S3 Group background. Flex Health Solutions's strongest advantage: large global network of ISO 13485 and FDA-registered sites.
How do S3 Connected Health and Flex Health Solutions differ in pricing?
S3 Connected Health uses fixed project, time and materials, managed service pricing. Flex Health Solutions uses manufacturing supply agreement, npi contract pricing. Neither firm publishes a full rate card; a discovery call is required for project-specific quotes.
Which is better for enterprise: S3 Connected Health or Flex Health Solutions?
S3 Connected Health is the larger team and typically the better enterprise-scale choice. For very large programmes, verify team size and compliance coverage directly with each company before shortlisting.
What are the main differences between S3 Connected Health and Flex Health Solutions?
S3 Connected Health's primary differentiator is: combines embedded wireless engineering with patient-facing apps and data platforms for pharma programs. Flex Health Solutions's primary differentiator is: dedicated NPI center and design sites that feed directly into Flex's medical manufacturing network. They also differ in team size (200–300 vs Large (Flex Ltd.)), minimum engagement (Not disclosed vs Not disclosed), and primary industries served (Drug delivery, Digital health vs Drug delivery, Diagnostics & lab devices).
Verify all details directly with each company before making a decision.