--- title: "EHR ↔ patient app - Stacksync" description: "Sync appointments, lab results, and prescriptions between Epic, Cerner, and your patient portal in real time, two-way, so patients and clinicians see the same…" canonical: https://www.stacksync.com/use-case/ehr-patient-app last_modified: 2026-07-05 --- Stacksync × Supabase Miami: **AI-Native Operations** Oct 13 [Reserve your spot](https://www.stacksync.com/events/2026-10-13-supabase-miami) Real-time, two-way EHR sync at clinical scale # EHR ↔ patient app on one shared record Push appointment changes, lab results, and prescription updates between Epic, Cerner, and your patient portal the moment they happen, two-way and in real time, so neither side ever shows stale data. [Book a demo](https://www.stacksync.com/book-a-demo) [Talk to a solutions architect](https://www.stacksync.com/book-a-demo) ## Adopted by fast-scaling companies moving mission-critical data in real time - Gladia Case study - IDEXX - MedPro Migrated from MuleSoft - Eko Case study - Ubicloud - Vimeo - Codility Migrated from Celigo - ACERTUS Migrated from Heroku Connect - Syringa Migrated from Matillion - Truora - Streaam Case study - SEAL SQ - Rinsed Migrated from Fivetran - IA Capital Group Case study - Meter - Golden Pear Funding Migrated from Celigo Where the EHR and the app fall out of sync ## Three reasons patients see the wrong record. Your portal and your EHR were built by different vendors and never meant to share state. The handoffs break in predictable places. 01 - Stale results ### Lab results show in Epic, not the app A result posts in Epic at 9am and reaches the portal that night, or never. Patients call the front desk for numbers their chart already has, and clinicians field the same questions twice. LATENCY 02 - One-way feeds ### The patient reschedules, the EHR doesn't know Most HL7 feeds run one direction. A patient cancels in the app, but Cerner still holds the slot, so the schedule and the portal disagree all morning. CONFLICT POLICY 03 - No audit trail ### You can't prove who saw which PHI When a record crosses from EHR to app, point-to-point scripts log nothing. An auditor asks who accessed a result and when, and nobody can answer with confidence. COMPLIANCE PLATFORM ## Six products. One Platform. Replace many legacy vendors. Every tool Stacksync replaces is one fewer vendor, one fewer bill, one fewer integration to maintain. [Start building now](https://www.stacksync.com/book-a-demo) ### [Two-way sync](https://www.stacksync.com/two-way-sync) Changes made in one platform automatically update across all connected systems in real time, eliminating data silos and reducing errors. Replaces: Heroku Connect and Salesforce Data 360 Heroku Connect Salesforce Data 360 ### [Workflow automation](https://www.stacksync.com/workflow-automation) Stop building brittle API scripts. With Stacksync, you can trigger complex automated workflows using simple SQL commands. Replaces: Workato and Boomi ### [AI Agents](https://www.stacksync.com/ai-agents) Expose every enterprise system to your agents through a single MCP layer. Claude, ChatGPT and Gemini get production-grade tools without custom glue code. Natively available in: Claude and ChatGPT and Gemini Claude ChatGPT Gemini ### [Event queues](https://www.stacksync.com/event-queues) Handle massive traffic spikes without losing a single event. Queues buffer your data during surges, ensuring strict ordering and reliable delivery. Replaces: Kafka and Amazon SQS and Confluent Kafka Amazon SQS ### [Database hosting](https://www.stacksync.com/database-hosting) Interact with your CRM, ERP, and payment tools as if they were just another table in your database. Say goodbye to rate limits and complex API documentation. Replaces: AWS RDS and Self-hosted databases AWS RDS Self-hosted databases ### [EDI](https://www.stacksync.com/edi) Transform legacy EDI complexity into simple database interactions. Stacksync automatically parses incoming EDI documents directly into your database tables. Replaces: SPS Commerce and TrueCommerce [Start building now](https://www.stacksync.com/book-a-demo) Connectors ## Every system a patient record touches, on one sync. Stacksync ships pre-built two-way connectors for the EHRs, integration engines, and portals patient data flows through, with field-level conflict policies, replay, and full audit logging. EHR & clinical 05 - Epic - Cerner - NextGen Healthcare - eClinicalWorks - athenahealth Integration & exchange 05 - Redox - HL7v2 - FHIR R4 - Mirth Connect - Salesforce Health Cloud Engagement & messaging 05 - Twilio - SendGrid - Salesforce - Slack - Microsoft 365 Data & records 05 - Snowflake - BigQuery - Postgres - MongoDB - Oracle DB Custom Epic Clarity fields, FHIR extensions, and your portal's own schema are first-class, no scripting required. [Browse all 1,000+ connectors](https://www.stacksync.com/connectors) SECURITY ## Security teams trust Stacksync As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers. [Learn more about security](https://www.stacksync.com/security) | | | | --- | --- | | | SOC 2 Type II | | | ISO 27001 | | | HIPAA BAA | | | GDPR | | | CCPA | | | DPF US-EU-UK-CH | → SECURITY WITH BENEFITS ### SSO & SCIM Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more. ### Alerts Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options. ### Secure connection options Securely connects to your systems with: [OAuth 2](https://www.stacksync.com/security) [SSH Tunnelling](https://docs.stacksync.com/two-way-sync/connectors/setup-options/ssh-tunneling) [SSL certificates](https://docs.stacksync.com/two-way-sync/connectors/postgres/authorize-postgres/amazon-rds/ensuring-secure-rds-connections-with-ssl-certificate) [IP Whitelisting](https://docs.stacksync.com/two-way-sync/connectors/setup-options/ip-whitelisting) [VPN gateway](https://docs.stacksync.com/two-way-sync/legal/service-consumption-tables#:~:text=%E2%9C%93-,VPN%20gateway,-%2D) [VPC peering](https://www.stacksync.com/security) and more Common questions ## Common questions about EHR-to-app sync. The concerns every clinical and IT team raises before connecting an EHR to a patient-facing app. [Talk to a solutions architect](https://www.stacksync.com/book-a-demo) ### How fast does a lab result reach the patient app? Sub-second when the EHR emits an HL7 or FHIR event; otherwise 1–60s on a configurable poll. Patients see results the moment the clinician releases them, not after a nightly feed. ### Is the sync two-way, so reschedules flow back to the EHR? Yes. A cancel or reschedule in the portal writes back to Epic or Cerner in real time, and field-level conflict policies decide which side wins if both change at once. ### How do you keep PHI access auditable? Every record movement is logged with source, destination, fields, and timestamp, and each event is replayable. You can show an auditor exactly which PHI moved where and when. ### Can we map custom EHR and FHIR fields? Yes. Epic Clarity columns, FHIR R4 extensions, and your portal's custom fields map in the visual mapper alongside standard demographics and sync the same way. ## Stop syncing charts overnight. Show patients live records. [Book a demo](https://www.stacksync.com/book-a-demo) [Get started](https://app.stacksync.com/)