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Two-way sync means a change in either system propagates to the other automatically. Update a contact in Salesforce, and the change appears in HubSpot a moment later. Update the same contact in HubSpot, and Salesforce is updated. Stacksync handles the round-trip transparently, including the case where both sides are edited at the same time — that is conflict resolution, and Stacksync has a configurable policy per object and per field.

You pick the conflict policy: last-write-wins (source-side timestamp decides), source-of-truth-wins (one system is canonical for that field), or manual review (the conflict is queued in the dashboard for an operator to resolve). The dead-letter queue captures every conflict with full state from both sides, so any decision is auditable and replayable. Conflict policy is configurable per-connection, per-object, and per-field.

Sub-second to a few seconds end-to-end for systems with native change events. Stacksync subscribes to Salesforce CDC, HubSpot webhooks, Dynamics change tracking, Postgres logical replication, MySQL binlog, MongoDB change streams, and similar feeds — so an edit emits an event within milliseconds and the destination is updated 200 to 800 milliseconds later. For polling-based sources without native events, latency is 30 seconds to 5 minutes depending on poll interval.

Almost every connector in the catalog supports bidirectional sync. The major categories: CRMs (Salesforce, HubSpot, Dynamics, Zoho, Pipedrive, Attio), ERPs (NetSuite, SAP, Dynamics F&O, Workday, Sage Intacct), databases (Postgres, MySQL, MongoDB, DynamoDB, Oracle, SQL Server), warehouses (Snowflake, BigQuery, Databricks), customer-success and support tools (Intercom, Zendesk, Front), and dozens more. The full list is at stacksync.com/connectors.

No. Stacksync is no-code by design. Connecting a system takes 2 to 5 minutes (OAuth or API key plus mapping). The mapping UI is drag-and-drop with field-level transformations, conditionals, and lookup tables. For advanced cases, you can drop into JavaScript or Python in a workflow step — but only when you want to, not because you have to.

Every sync event is durably queued. On transient failures (API timeout, rate limit, destination unavailable) Stacksync retries with exponential backoff for up to 7 days. Persistent failures route the event to a dead-letter queue where you can inspect the payload, fix the underlying issue, and replay with one click. Bulk replay is supported for major incidents. Nothing is lost.

Native integrations (Salesforce-to-NetSuite, HubSpot-to-Salesforce, etc.) usually batch-sync overnight and are one-way only. Stacksync is real-time and bidirectional, handles 200+ apps with one platform instead of a different tool per pair, and centralizes audit logs and conflict resolution. Most teams replace a stack of 4 to 6 point integrations with a single Stacksync deployment.

Yes — financial workloads are a core Stacksync use case. SOC 2 Type II, ISO 27001, and customer-managed encryption keys cover the security posture. Per-field write controls let you flow some fields one-way (e.g., never overwrite GL entries from CRM) while keeping others two-way (e.g., contact records). Idempotency keys, atomic batch writes, and dead-letter replay protect against double-writes during retries. NetSuite, SAP, and Workday customers run Stacksync on AR, AP, and GL data in production.