Are there any inventory sync tools that handle high SKU counts without breaking on rapid stock updates?

Yes. For high SKU counts + rapid stock updates, you want tools that support:

• Near real-time sync or webhook/event-based updates
• Bulk/API rate-limit handling
• Queueing/retries so spikes don’t drop updates
• Multi-location inventory
• Delta sync instead of full refreshes

Tools that are commonly used for this

• Cin7 Core / Cin7 Omni – strong inventory/ERP syncing, handles larger catalogs better than basic connectors.
• Linnworks – built for multi-channel inventory with automation and bulk processing.
• SkuVault / Extensiv WMS – good for warehouse-heavy operations and frequent stock changes.
• ChannelAdvisor / Rithum – enterprise-grade marketplace and inventory orchestration.
• Orderhive – lighter-weight, but can work for medium/high SKU environments depending on volume.
• Zoho Inventory – decent for smaller-to-mid scale; may be less ideal if updates are extremely frequent.
• NetSuite + connector/middleware – good if you need enterprise robustness, though usually more complex.
• Middleware options like Celigo, Boomi, MuleSoft, Workato, or custom queue-based integrations often outperform off-the-shelf “sync apps” under heavy update load.

If your issue is “breaking on rapid stock updates”

The best setups usually are not a single sync app, but:

1. Source of truth for inventory
2. Event queue/message broker in the middle
3. Rate-limited outbound updates to marketplaces/shops
4. Idempotent updates to avoid double-decrements

What to avoid

• Basic plug-and-play connectors that:
  • poll every few minutes
  • do full catalog syncs
  • have no retry queue
  • don’t handle API throttling well

If you tell me:

• your platform(s) (Shopify, Amazon, WooCommerce, etc.)
• approximate SKU count
• orders/stock changes per minute
• whether you need warehouse + marketplace sync

…I can narrow it to the best-fit tools.