Open Wearables vs Junction
Open-Source Alternative
Junction is a managed wearable data platform with proprietary infrastructure. Open Wearables is open source, self-hosted, and MIT licensed. No lock-in, and no vendor between you and your data.
One platform for wearable data and health intelligence.
Open Wearables is an open-source alternative to Junction for teams worried about being locked into a wearable data vendor. The entire platform is MIT licensed, so the integration code, the scoring algorithms, and the deployment all belong to you, and there is no contract term or pricing change that can strand your product. It connects all major wearable providers through one unified REST API and computes documented health scores: Sleep Score from duration, stages, consistency, and interruptions, and Resilience Score from heart rate variability. Should you ever want to leave, the data is already in your own PostgreSQL database and the code is already yours to fork. An MCP server exposes scores and trends to any LLM. You do take on running the infrastructure, which a managed service would otherwise handle. Built and maintained by Momentum.
Unified API
Connect wearable providers through a single REST API. One integration, all devices.
Open health scores
Sleep, HRV, recovery, VO2 max. Every algorithm published under MIT license and fully customizable.
AI-ready
MCP-compatible interface connects your LLM stack directly to wearable data. No proprietary intermediary.
Self-hosted
Docker Compose or one-click Railway. FastAPI, PostgreSQL, Redis, Celery. Your infra, your data.
Looking for a Junction alternative? Junction aggregates wearable data through a managed cloud platform. It handles authentication and normalization, but your data flows through their infrastructure and you operate on their terms. Open Wearables solves the same integration problem as a self-hosted, open-source platform. You deploy it, you own the data, and the source code is yours under the MIT license.
The comparison below covers the key differences between the two.
Side by side.
| Aspect | Junction | Open Wearables |
|---|---|---|
| Pricing | SaaS pricing, per-user model | Self-hosted. You own your infrastructure. |
| Hosting | Cloud-only | Self-hosted. Your servers, your data. |
| Source code | Closed source | MIT licensed. Fully open. |
| Health algorithms | Proprietary | Open algorithms: sleep, HRV, recovery, VO2 max. Auditable and customizable. |
| Wearable providers | Selected providers | Garmin, Polar, Whoop, Strava, Apple Health, Samsung Health, Google Health Connect, Suunto, Oura |
| Data ownership | Data processed on Junction's cloud | Full. Data never leaves your infrastructure. |
| GDPR / HIPAA | Dependent on Junction's DPA | Self-hosted by design. You control compliance. |
| Deployment | SaaS only | Docker Compose or one-click Railway |
| License | Proprietary | MIT |
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Why teams choose Open Wearables as a Junction alternative.
No lock-in, ever
Junction is a closed SaaS. Your integration depends on their infrastructure, their API, and their pricing model. If they change any of it, you adapt on their timeline.
Open Wearables is MIT-licensed. You deploy it on your own infrastructure, fork it, modify it, or migrate away from it at any point. The source code does not disappear because a vendor makes a business decision.
Your data stays on your infrastructure
With Junction, wearable data flows through their cloud before it reaches your application. Open Wearables runs on your servers. Your database. No third-party data processing, no external dependencies in your data pipeline.
Self-hosted at any scale
Junction charges per connected user. With Open Wearables you pay for the compute you run.
At 10,000 users, the cost difference is not marginal.
Open algorithms you can actually use
Open Wearables publishes all health scoring logic under the MIT license. Sleep, HRV, recovery, strain, VO2 max. You can read every calculation, customize weights, or build additional scoring on top.
Junction's processing is closed.
Who uses Open Wearables instead of Junction.
Wellness and consumer health apps
Connect multiple wearables, compute open health scores, and build personalized experiences without paying per user or explaining black-box outputs to your team.
Clinical and digital health platforms
Full data ownership and self-hosted architecture means wearable data never leaves your infrastructure. Designed for environments where GDPR and HIPAA compliance are non-negotiable.
Sports performance and coaching tools
Open algorithms for HRV, recovery, strain, and VO2 max. Customizable scoring that fits your methodology, not a vendor's proprietary model.
Corporate wellness programs
Self-hosted at any scale. Connect devices across a large workforce without infrastructure lock-in.
Who is the Junction alternative for?
Open Wearables
Open Wearables fits teams that need full data ownership, want to avoid vendor lock-in, or are building for regulated environments where third-party data processing creates compliance risk. It requires self-hosting on Docker or a managed platform like Railway.
Junction
Junction fits teams that want a managed wearable data layer with minimal infrastructure overhead and are comfortable with cloud-based data processing and SaaS pricing.
How to get started.
Open Wearables is open-source and available on GitHub. Deploy via Docker Compose or one-click Railway, then connect to the wearable providers you need.
Each provider requires its own developer credentials. Open Wearables handles authentication, data normalization, and the unified API layer. The full setup guide is in the docs. For teams that want to talk through the integration first, the Momentum team is available for a demo.
See supported wearable providers: Garmin, Oura, Whoop, Strava and more →
Common questions.
Which wearable providers does Open Wearables support?
Garmin, Polar, Whoop, Strava, Apple Health, Samsung Health, Google Health Connect, Suunto, and Oura. Full provider list is in the docs.
Is Open Wearables production-ready?
Yes. The wearable data layer is production-ready and used by healthtech teams in production. Open Wearables runs on FastAPI, PostgreSQL 18, Redis 8, and Celery, deployed via Docker Compose, with an architecture designed for horizontal scaling. Health scores are available now: Sleep Score computes a nightly 0-100 value across four pillars (duration, stages, consistency, interruptions), and Resilience Score measures autonomic nervous system stability weekly through heart rate variability. Check the GitHub releases for the current status of each component.
What does self-hosting actually require?
Docker Compose for a standard setup, or one-click deploy on Railway. The stack is FastAPI, PostgreSQL, Redis, and Celery. If you can run a containerized backend, you can run Open Wearables.
Who maintains Open Wearables?
Open Wearables is built and maintained by Momentum, a healthtech software house with 10 years of experience. MIT-licensed, backed by a commercial team with long-term skin in the game.
What if I need enterprise support or custom integrations?
The core platform is free and open-source. Momentum offers paid services on top: custom integrations, specialized ML models, enterprise deployment with SLA-backed support, and BAA for HIPAA-covered environments. Book a demo to discuss your requirements.
Open Wearables is built and maintained by Momentum, a healthtech software house with 10 years of experience. The platform is MIT-licensed and actively maintained. Momentum offers commercial services on top for teams that need custom integrations, enterprise deployment, or SLA-backed support.
Open-source. Self-hosted. No lock-in.
Deploy Open Wearables on your infrastructure. MIT licensed. Self-hosted.