Calculate exact channel-specific inventory holdback buffers, 15-minute webhook sync lag exposure, marketplace cancellation defect penalties, and net-margin priority rules—100% locally in your browser without a $99/month sync app.
Instant 50ms preview directly in your browser. Zero server queues, zero data leaks.
Drop Local File Here or Click to Browse
Supports CSV, JSON, TXT, XML & Log Streams
=SUMIFS(multi_gross, SKU, A2) - VLOOKUP(A2, multi_fees!A:D, 4, FALSE)⚠️ Why Manual Formulas Fail at Scale: Manual spreadsheet formulas break on multi-row multi channel adjustments, tiered fees, and CSV delimiter shifts.
🛡️ Zero-Upload Local Studio Advantage: Run Multi Channel calculations and CSV checks 100% locally in your browser.
Core capabilities built into ChannelBuffer Studio
Most inventory sync apps poll marketplaces every 5 to 15 minutes. During a promo or creator drop, broadcasting 100% of your remaining 80 units to 4 channels triggers simultaneous checkouts and forced order cancellations.
Seller-fault cancellations destroy Buy Box eligibility and trigger account health warnings. Set dynamic holdback floors that delist marketplaces before physical bins hit zero.
Why let a discounted wholesale or marketplace order take your last unit when Shopify buyers pay full retail with zero 15% referral fee? Allocate scarce inventory by net contribution per unit.
Drop your multi-channel SKU export into your browser to calculate exact virtual bundle limits and per-channel stock feeds with zero store OAuth permissions.
Zero configuration, zero cloud server dependencies, instant execution.
Paste your physical 3PL/warehouse quantities alongside Shopify, Amazon, TikTok Shop, and B2B order velocities and net unit margins.
Slide your API sync-lag safety cushion from 5% to 35% to see exact publishable quantities per marketplace and prevent pre-fulfillment cancellation penalties.
Unlock the complete multi-channel allocation matrix, virtual bundle kit limiter, and ready-to-upload channel stock CSVs for a one-time $19 buyout.
See why merchants and prosumers switch from monthly subscriptions to our local buyout.
| Feature / Metric | 🛡️ ChannelBuffer Studio | ☁️ Cloud SaaS (TrunkInventory) |
|---|---|---|
| Pricing Structure | 🛡️ $19 One-Time Buyout (€3.99 Quick Pass) | ☁️ $99 to $249/month order-volume SaaS tiers |
| Margin-Weighted Scarcity Waterfall | 🛡️ Auto-prioritizes highest net-margin channel on final units | ☁️ Blindly broadcasts identical stock % to all channels |
| Marketplace Cancellation Defect Audit | 🛡️ Models Amazon 2.5% & TikTok Shop cancellation SLA risk | ☁️ No financial penalty or Buy Box loss modeling |
| Store API & Order Data Privacy | 🛡️ 100% Local Browser Execution (Zero OAuth Sync) | ☁️ Requires permanent read/write API access to all stores |
Eliminate vendor lock-in and cloud upload security risks.
Why pay recurring monthly SaaS fees for multi channel workflows? Switch to ChannelBuffer Studio for a single $19 buyout.
TrunkInventory syncs your data to remote servers. We process 100% locally on your machine.
Process multi-row multi channel files instantly without broken VLOOKUP/SUMIFS formulas.
Deep technical breakdown driving our client-side productivity engine.
Processes ChannelBuffer Studio structures directly inside isolated browser memory.
Ensures zero ChannelBuffer Studio bytes touch external API servers or third-party storage.
Parses high-throughput ChannelBuffer Studio records in real-time with sub-50ms response times.
Complete commercial data sovereignty with standalone offline capability.
No monthly bills. No sneaky price hikes. Pay once, use forever.
Live Local Studio Preview
Prosumer & Solo Professional
One-Off Emergency Unlock & Trial
Everything you need to know about privacy, local memory execution, and buyouts.
Because 'real-time' marketplace sync still suffers from 3-to-15 minute webhook queues, pending payment holds, and Amazon pending-order delays. If you have 40 units left and broadcast all 40 to Shopify, Amazon, and TikTok Shop during a traffic spike, multiple channels will accept orders for the same physical units before the quantity update propagates.
Amazon requires sellers to maintain a Pre-Fulfillment Cancel Rate below 2.5%. Canceling seller-fulfilled orders due to out-of-stock errors strips your Buy Box share, penalizes organic ranking, and risks FBM listing deactivation.
Holding back 20% on your own high-margin Shopify store artificially throttles your most profitable sales. Instead, our margin-weighted waterfall publishes 95%–100% of available stock to your highest-margin DTC storefront while applying stricter 15%–30% holdback cushions to high-penalty, lower-margin marketplaces.
If a base SKU has 120 units in your 3PL, a 3-pack bundle has a theoretical maximum of 40 kits. However, publishing 120 single units AND 40 3-packs simultaneously creates 240 units of exposure. Our calculator partitions shared component inventory so single units and multipacks never collide.
No. All multi-channel buffer calculations and CSV feed generations execute 100% locally in your browser tab. Your SKU velocities, supplier costs, and channel margins stay on your machine.
You unlock lifetime access to the multi-channel holdback allocation table, virtual bundle component splitter, marketplace SLA defect estimator, and instant CSV export—with zero monthly subscription fees and a 14-day refund policy.