Huixin EMAI Platform
An integrated platform combining Huixin Platform and Huixin Assessment: ecological momentary assessment (EMA) captures the present state, and ecological momentary intervention (EMI) steps in in real time, covering study design, data collection, participant management, and data export.
Research methodology
What are ecological momentary assessment and ecological momentary intervention?
Ecological momentary assessment · EMA
In natural settings, high-frequency, real-time data collection records emotional experience, behavior, physiological state, and environmental factors, substantially reducing recall bias in traditional retrospective assessment.
EMA-related research is growing exponentially worldwide, moving from a niche scientific method toward a mainstream paradigm in psychiatric and psychological research.
Ecological momentary intervention · EMI
In the same natural contexts, intervention content is pushed to the individual in real time at the right moment, so that intervention happens in everyday life rather than only in the clinic or the lab.
Delivery and effects of interventions can be tracked continuously with EMA data, forming an “assess—intervene—reassess” research loop.
A shared methodological foundation
Real-time
Both assessment and intervention happen in the moment: states are recorded immediately, and interventions are delivered immediately
High-frequency repetition
Densely track within-person fluctuations over time, rather than taking a single cross-section
Mobile delivery
Carried out on a personal device, in real-life situations, without interrupting daily life
Ecological validity
Both data and intervention effects come from real-world settings, making findings easier to generalize to everyday life
Researcher console · investigators
Huixin Platform
A research workstation from study design to data analysis: it brings together core capabilities such as study design, participant recruitment, real-time monitoring, and data preprocessing, so you can manage EMA assessment and EMI intervention studies in one place.
Product capabilities
Core features
Console capabilities designed around the EMA research workflow, so every step stays under control.
Research project management
Unified management of single- and multi-center projects, groups, and protocols
- Create and manage research projects
- Single- and multi-center study management
- Configure research sites, groups, and differentiated study protocols
Participant screening and management
End-to-end participant management from screening questionnaires to enrollment and grouping
- Configure initial screening and screening questionnaires
- Configure inclusion/exclusion criteria and manage screening results
- Batch enrollment, grouping, and individualized management of participants (by research site)
Ecological momentary assessment (EMA) protocol configuration
Configure multi-format assessment tasks and flexible sampling strategies
- Create assessment tasks in multiple formats, including scales, text, images, audio, video, and animation
- Multiple sampling strategies, including fixed times, fixed intervals, random times, and signal-triggered sampling
- Flexibly configure sampling duration, frequency, response windows, and repeat cycles, with support for group-level differences
Ecological momentary intervention (EMI) protocol configuration
Task design for intervention delivery: multi-format task creation, trigger logic, and randomized scheduling
- Create and deliver multimedia intervention content, including text, images, audio, video, and animation
- Timed, periodic, and random triggers, as well as assessment-signal-based delivery, with timing precisely controlled by the protocol
- Randomized allocation of intervention content and random time-window triggers to reduce expectancy effects, with support for group-level and individualized configuration
Baseline and follow-up management
Scales, schedules, and reminders at baseline and follow-up time points
- Configure baseline assessment scales and proactively push tasks
- Configure follow-up scales, assessment schedules, and repeated measures at preset time points
- SMS reminders and monitoring of task completion
Data management
Progress visualization and data viewing, export, and aggregation
- Visual monitoring of task completion rates, response rates, and data-collection progress
- View and export physiological data together with scale, mood, and other psycho-behavioral data
- Aggregate multi-center data and review it by site
Wearable-device management
Device-binding management and automatic synchronization of physiological data
- Bluetooth pairing, binding, and unified management of smart rings
- Passive collection and automatic synchronization of physiological data
- Monitoring of wear status, data availability, and connection status
User and permission management
Multi-role, multi-center data isolation and collaboration
- Configure permissions for multiple roles, including administrators, researchers, and participants
- Collaborative management across multiple sites, studies, and research teams
- Configure site-level access permissions and isolate research data
Participant app · participants
Huixin Assessment
Participants only need to complete simple daily questionnaires, wear a smart device, and receive intervention content pushed by the platform to take part in assessment or intervention studies. A clean, intuitive interface and automated flows minimize participant burden.
Product capabilities
Core features
The entire participant journey is completed in a single app: view research projects and tasks, receive assessments and interventions, and sync wearable data.
Research project and task management
A centralized view of study participation and task progress
- View and switch among participating research projects
- Task calendar: completed / completed late / to be completed / not completed
- Statistics on individual completion and study-participation progress
Assessment and intervention tasks
Automatic push of baseline, EMA, EMI, and follow-up tasks, with in-app notifications
- Multiple interaction formats, including scales, text, images, audio, video, and animation
- Persistent tasks support initiating ecological momentary assessments on demand
- Complete tasks online with automatic data upload
- Look up “My questionnaires” and “My records” at any time
Wearables and health data
After a ring is bound, physiological data are collected passively and synced automatically
- Bluetooth pairing, binding, and connection-status monitoring for smart rings
- Trend views for seven types of metrics: heart rate, HRV, blood oxygen, stress, skin temperature, physical activity, and sleep
Wearable devices
Seamless integration of subjective and objective data
Through open APIs and HealthKit, objective physiological data from smart rings and third-party wearables can be brought into the platform and analyzed together with subjective scale reports in the same study.
Smart ring appearance
X3 (medical-grade) · X6 dual models · multiple colors
Smart Ring X3
Medical-gradeMedical-grade multimodal monitoring, with high-frequency sampling and raw RRI signal output
Smart Ring X6
Popular for researchLightweight everyday monitoring covering core physiological and behavioral metrics, with a low wear burden
Data dimensions collected by the smart ring
11 physiological and behavioral metrics
Heart rate
HR
Heart rate variability
HRV
Blood oxygen saturation
SpO₂
Skin temperature
Skin Temperature
Stress index
Stress
Activity acceleration
ACC
Steps
Steps
Activity distance
Distance
Activity duration
Active Duration
Energy expenditure
Calories
Sleep stages
Sleep Stages · Deep sleep / light sleep / REM / awake
Device specifications
Full X3 · X6 specification comparison
| Parameter | Smart Ring X3Medical-grade | Smart Ring X6 |
|---|---|---|
| Sensor configuration | ||
| Accelerometer (ACC) | 3-axis，25 Hz | 3-axis，25 Hz |
| Photoplethysmography (PPG) | Cross-optical PPG，25 Hz | PPG，25 Hz |
| Skin-temperature sensor (NTC) | NTC; the API can read 3 temperature channels | 3 × NTC，1 Hz |
| Data collection | ||
| Heart rate (HR) | Default every 30 min, adjustable | Default every 30 min, adjustable |
| Heart rate variability (HRV) | Default every 60 min, adjustable | Default every 60 min, adjustable |
| Blood oxygen saturation (SpO₂) | Default every 60 min, adjustable | Default every 60 min, adjustable |
| Skin temperature | Default every 60 min, adjustable | Default every 60 min, adjustable |
| Battery and charging | ||
| Battery life | About 10 days | About 10 days |
| Charging time | < 90 min | < 2 h |
| Hardware specifications | ||
| Ring size | US sizes 7–14 (8 sizes) | Sizes 6–14 (9 sizes) |
| Inner diameter | 17.4–23.1 mm | 16.5–23.1 mm |
| Body material | Titanium | Titanium |
| Water resistance | 5 ATM | 5 ATM |
| Platform integration | ||
| Data transmission | Bluetooth | Bluetooth |
| Data sync | Automatic sync | Automatic sync |
Note: sampling intervals for heart rate, HRV, blood oxygen, and skin temperature can be configured at 5 / 10 / 15 / 20 / 30 / 60 min and similar intervals.
Other supported devices
How to connect third-party wearables
Huawei watches / bands
Watches: HUAWEI WATCH GT 2 / GT 2 Pro (ECG) / GT 3 / GT 3 Pro / GT 4 / GT 5 / WATCH D / WATCH D2 (wrist dynamic blood-pressure recorder); bands: HUAWEI Band 6 / 6 Pro / 7 / 8
- The devices above require assistance from Huawei researcher-platform staff to complete device adaptation
- Huawei data can be connected directly only through the Android Huixin Assessment app. iOS users can first sync Huawei data to Apple Health, then bring it into the research console via HealthKit
Apple Watch
- Apple Watch data can be brought into the Huixin Platform researcher console via HealthKit
Smart band
J2208A fashion sport band (screenless)
- Collects physiological data such as heart rate, sleep, and activity, syncs to the platform over Bluetooth, and serves as a lightweight device for everyday monitoring
Other third-party wearables that provide an open data interface can also be evaluated for connection to the platform. SeePlans and pricing · Value-added servicesfor “Hardware-device interfaces.”
Annual subscription
Plans and pricing
Choose a plan by study scale. Every plan includes core platform capabilities and cloud technical support.
Note: participant capacity = the number of people online at the same time during the subscription term; number of research projects = the cap on concurrent active studies. Additional participants: +20 people / $150 / year.
| No. | Product / service description | Quantity | Unit price | Amount |
|---|---|---|---|---|
| 1 | Methodological support for a first EMA / EMI study Methodological support for conducting an EMA / EMI study for the first time: study-design advice, guidance on configuring tasks and push protocols, and instructions for data collection and export | As needed | $750 / session | Billed by the number of sessions actually delivered |
| 2 | Cognitive assessment package A yearly subscription package of cognitive-test tasks, including Stroop, N-back, and others, which can be delivered as tasks in the platform | As needed | $4,480 / year | Billed for the actual subscription term |
| 3 | Smart Ring X3 (medical-grade) Continuously collects physiological data including heart rate, SpO₂, HRV, stress, skin temperature, sleep, activity (7 types), and raw RRI signals, and syncs automatically to the platform over Bluetooth | As needed | $120 / unit | Billed by actual order quantity Bundle pricing (30 / 60 / 100 units, same model):30 units $3,600 / set60 units $7,200 / set100 units $12,000 / setSizes in a set follow the standard mix and can be adjusted by researchers based on participants |
| 4 | Smart Ring X6 Collects physiological data such as heart rate, SpO₂, HRV, stress, skin temperature, sleep, and activity, and syncs automatically to the platform over Bluetooth | As needed | $75 / unit | Billed by actual order quantity Bundle pricing (30 / 60 / 100 units, same model):30 units $2,250 / set60 units $4,500 / set100 units $7,500 / setSizes in a set follow the standard mix and can be adjusted by researchers based on participants |
| 5 | Hardware-device interfaces Provides platform integration for third-party hardware that exposes a data interface, including data mapping and automatic sync to a unified dashboard | As needed | Assessed according to custom requirements | Custom billing |
| 6 | Custom standalone mini program (name and logo) Customize a standalone mini program on top of the existing app, with a custom name and logo, published independently under the client’s brand; renewal and maintenance $2,990 / year (including system maintenance and technical support) | As needed | $14,900 / project | One-time custom billing |
| 7 | On-premises private deployment and operations Billed according to actual requirements; operations fees are charged separately by the year | As needed | Assessed according to custom requirements | Custom billing |
System requirements and deployment
Runtime environment, data security, and deployment options
| Item | Description | Fee allocation |
|---|---|---|
| Device compatibility | The participant app is compatible with Android 5.0 and later and iOS 10.0 and later | Included in the platform service fee |
| Data security and access | Encrypted data transmission and storage; role-based access control | Included in the platform service fee |
| Cloud deployment | The platform is deployed in a designated cloud-server environment, with internet access, system updates, and routine operations | Included in the platform service fee |
| On-premises private deployment | The platform is deployed on a server designated by the hospital or research institution, including system installation, environment configuration, deployment testing, and private operations services | Deployment and implementation fees charged separately |