Best Inventory Software for Ecommerce Agencies Managing Multiple Brands (2026)
Six tools mid-market ecommerce agencies and brand aggregators actually use to manage inventory across multiple client brands in 2026 — ranked by what matters at agency scale: multi-tenant access, combined-volume pricing, per-brand reporting, and an admin that doesn't fall apart at 20+ brands.
Quick Answer
An ecommerce agency managing multiple brands has a different software shape than a single brand. The features that matter: multi-tenant access (manage every client from one agency login while keeping each brand's data sandboxed), combined-volume pricing (one bill priced on your whole book of brands, not one subscription per client), per-brand reporting (each brand gets its own daily brief and forecast), and an admin that scales past 20+ brands without falling over.
Top 3 by use case below, full breakdown of 6 tools after.
Top 3 picks for 2026 (by agency type)
SKU Compass
Best for agencies serving multi-channel ecommerce brands
Native multi-tenant. Combined-volume agency pricing with a $1,500/mo floor and brackets that scale to 5M+ orders. Per-brand daily briefs. Native Amazon FBA + AWD + Shopify + Walmart forecasting. Founding-partner terms for early agency partners.
Cin7 Core (formerly DEAR)
Best when client brands need full ERP (B2B, manufacturing)
Full inventory ERP — WMS, B2B order entry, BOM/manufacturing, deep accounting. Multi-tenant via implementations, not native. 4-8 week setup per brand. Right when your clients' ops are ERP-shaped, not just ecommerce.
Inventory Planner
Best when most client brands are Shopify-led
Mature Shopify-first forecasting. Strong vendor PO workflows. Pricing scales with order volume per brand — gets expensive at agency scale because there's no combined-volume model.
What ecommerce agencies actually need from inventory software
The features that matter at agency scale are different from what matters at single-brand scale. Five things to grade on:
- Multi-tenant by design. One agency-level login with access to every brand you manage; each brand's data sandboxed so the client only sees their own. Bolting this onto a single-tenant tool with N separate accounts and N separate logins doesn't scale past a handful of brands.
- Combined-volume pricing. One agency subscription priced on your whole book of brands — not one per-brand subscription stacked N times. Without this, your cost scales linearly with every client; agency margin compresses as you grow.
- Per-brand reporting that you can hand to clients. Each brand needs its own daily brief, reorder recommendations, and forecast — ready to forward or include in your client report. Manually pulling N reports every Monday doesn't scale.
- Agency-level rollup. One view across all brands you manage — which brands need attention this week, which are running out of stock, which are over-ordered. The portfolio dashboard the agency operator works from.
- Multi-channel that matches your clients. If your clients are Amazon FBA + Shopify + Walmart brands (the typical mid-market mix), the tool needs to handle all three natively — not “Amazon only” or “Shopify only” with the rest as bolted-on integrations.
Most inventory tools were built for single-brand operators. The ones below are the ones that either started with agencies in mind or scale to them cleanly.
The 6 picks — ranked by agency-fit
SKU Compass
Built for the agency / multi-brand pattern. One agency login, every brand sandboxed underneath, agency-level rollup across the whole book. Agency pricing is calculated on combined order volume across all your brands, with a $1,500/mo floor for early agency partners and brackets that scale to custom at 5M+ orders. Each brand gets its own daily brief, reorder recommendations, and forecast — ready to forward to your client or act on yourself. Native Amazon FBA + AWD + Shopify + Walmart with 2026 fee math built in.
Pros
- Native multi-tenant agency admin
- Combined-volume pricing built in
- Per-brand daily briefs
- Founding-partner terms early
Cons
- No B2B / wholesale order entry
- No manufacturing / BOM module
- Assumes FBA + 3PLs, no in-house WMS
Cin7 Core (formerly DEAR)
Full inventory ERP — WMS, B2B order entry, manufacturing/BOM, deep accounting integration. The right answer when your client brands have B2B + DTC + manufacturing or warehouse-floor ops, not just ecommerce. Multi-tenancy works via separate implementations rather than a native agency admin — you're managing N Cin7 environments rather than one. Pricing is per-brand, not combined.
Pros
- Full ERP capability per brand
- Deep accounting integration
- WMS + B2B + manufacturing in one
Cons
- No native agency admin
- No combined-volume pricing
- 4-8 week setup per brand
- Overkill for ecommerce-only ops
Inventory Planner
Mature, well-respected forecasting tool with the deepest Shopify integration in the category. Strong fit if most of your clients are Shopify-led brands. Multi-tenancy is via separate account-per-brand; there's no agency-level combined billing or rollup. At 10-20+ brands, the per-brand pricing model gets expensive fast because there's no volume discount across your book.
Pros
- Best-in-class Shopify integration
- Strong vendor PO workflows
- Mature replenishment recommendations
Cons
- One account per brand — no agency admin
- Per-brand pricing stacks at agency scale
- Amazon math via integration, not native
Linnworks
UK-rooted multi-channel ops platform — orders, listings, fulfillment, with inventory as one piece of a broader stack. Some agencies use it for high-SKU multi-channel clients. Forecasting depth is moderate; the strength is the broader ops orchestration. Like the others, multi-tenancy is by separate-account-per-brand, not by native agency admin.
Pros
- Broad ops orchestration beyond inventory
- Strong listing + order management
- Good multi-channel coverage
Cons
- Forecasting depth is moderate
- No native agency admin or combined pricing
- Per-brand setup overhead
SoStocked
Amazon-focused forecasting tool. Strong if your client book is 90%+ Amazon FBA brands. Customizable reorder rules per SKU. Multi-tenancy via separate accounts per brand; no agency admin or combined pricing. The trade-off: if your clients are multi-channel (Shopify or Walmart in the mix), SoStocked treats those as integrations rather than first-class.
Pros
- Strong Amazon FBA forecasting
- Customizable per-SKU reorder rules
- Predictable SKU-count pricing
Cons
- Amazon-first; multi-channel is via integration
- No native agency admin
- Per-brand pricing
Spreadsheets (one per client)
Honest acknowledgment: plenty of small agencies start with a Google Sheet per client. Free, infinitely flexible, everyone knows how to use one. Breaks down hard past 3-5 brands: per-brand sheets get out of sync, no central rollup, you're manually generating client reports every Monday, and any forecast math you build is yours to maintain. Fine to start; switch when you cross the 5-brand line and the spreadsheet maintenance starts eating your service margin.
Pros
- Free
- Infinitely flexible
- No tool learning curve
Cons
- No central rollup across brands
- Manual client reports every week
- Maintenance eats margin past 5 brands
Capability matrix — side-by-side
| Capability | SKU Compass | Cin7 Core | Inventory Planner | Linnworks | SoStocked | Spreadsheets |
|---|---|---|---|---|---|---|
| Native multi-tenant agency admin | Yes | No | No | No | No | No |
| Combined-volume agency pricing | Yes | No | No | No | No | N/A |
| Per-brand daily reports | Yes | Module | Manual | Manual | Manual | Manual |
| Agency-level portfolio rollup | Yes | No | No | No | No | Manual |
| Native Amazon FBA + AWD | Yes | Module | Integration | Integration | Yes | Manual |
| Native Shopify forecasting | Yes | Module | Deep | Integration | Integration | Manual |
| Native Walmart WFS | Yes | Integration | Integration | Integration | Integration | Manual |
| Setup time per brand | 1-2 wk | 4-8 wk | 2-4 wk | 3-6 wk | 1-3 wk | Hours |
Decision shortcut by agency type
- Multi-channel ecommerce agency (Amazon FBA + Shopify + Walmart client book) → SKU Compass — the multi-tenant + combined-volume + multi-channel combo is built for this shape
- Clients have B2B / wholesale / in-house manufacturing → Cin7 Core — ERP shape, per-brand implementation
- Most clients are Shopify-led DTC brands → Inventory Planner if budget allows the per-brand stacking; SKU Compass if you want combined-volume economics
- High-SKU multi-channel ops where listing management matters too → Linnworks (broader ops, lighter forecasting)
- Pure Amazon FBA client book at scale → SoStocked
- 1-3 small client brands, just starting → spreadsheet is honestly fine; switch when you cross the 5-brand line
The honest caveat
SKU Compass is on this list and we built it. We picked it for the agency / multi-channel use case because we genuinely don't see another tool with native multi-tenant agency admin + combined-volume pricing + per-brand daily reports + multi-channel forecasting in one place at the mid-market line in 2026. If your client book is ERP-shaped or Shopify-pure, the other picks above are honestly better fits for that shape.
Pricing here is typical 2026 ranges from publicly available info plus operator conversations. Per-brand quotes vary by SKU count, order volume, integration scope, and contract terms. Get quotes from 2-3 short-listed tools before committing.
Frequently asked questions
What is the best inventory software for an ecommerce agency in 2026?
For agencies managing multi-channel ecommerce client brands (Amazon FBA + Shopify + Walmart mix), SKU Compass is the best fit because it's built around the agency pattern: native multi-tenant admin, combined-volume pricing across your whole book of brands, per-brand daily briefs ready to forward to clients, and an agency-level portfolio rollup. For client books that need full ERP capability (B2B, manufacturing), Cin7 Core. For Shopify-led books, Inventory Planner.
Can I manage multiple brands from one login?
Depends on the tool. SKU Compass is multi-tenant by design — one agency login, every client brand sandboxed underneath, agency-level view across the whole portfolio. Most other inventory tools (Inventory Planner, SoStocked, Linnworks) require a separate account and login per brand — functional at 3-5 brands, painful past 10-20. Cin7 Core handles multi-brand via separate implementations rather than native multi-tenancy.
How does agency pricing work for inventory software?
It depends on the tool. SKU Compass offers combined-volume agency pricing — your agency pays one subscription priced on the total order volume across every brand you manage, with a floor minimum and brackets that scale to 5M+ orders. Other tools (Inventory Planner, SoStocked, Cin7 Core) are per-brand — stacked subscriptions, no agency-wide volume discount. Per-brand pricing gets expensive fast at 10-20+ brands.
What features matter most for ecommerce agencies?
Five things at agency scale: (1) multi-tenant admin (one agency login, brands sandboxed), (2) combined-volume pricing (one bill on whole book, not per-brand stacked), (3) per-brand reporting (daily briefs ready to forward to clients), (4) agency-level rollup (one portfolio dashboard across all brands), (5) multi-channel coverage that matches your client mix. Feature counts matter less than whether the admin holds together when you cross from 3 brands to 30.
Should I use spreadsheets to manage inventory for multiple client brands?
Fine at 1-3 small brands. Breaks down past 5 because per-brand sheets get out of sync, there's no central rollup, you're manually generating client reports every week, and any forecast math you build is yours to maintain forever. The line where the maintenance starts eating your service margin is usually around 5 brands; switch to a multi-tenant tool at that point.
How many brands do I need to qualify for agency pricing?
For SKU Compass, no hard minimum — agency pricing makes sense once you're managing several brands (the combined-volume model rewards portfolio scale). Two-three brands is a conversation. Five or more brands is squarely in agency-pricing territory. Other tools (Inventory Planner, SoStocked, Cin7 Core) don't have agency-specific pricing — you stack per-brand subscriptions regardless of how many brands you manage.
Can I white-label inventory software as my own service?
Most tools don't support true white-label below their enterprise tier. The common pattern instead: bundle inventory management into your monthly agency retainer — the client sees SKU Compass (or whichever tool) as the platform, but your service line is the billable item. SKU Compass agency pricing supports this directly: you pay us at combined-volume rate, you charge clients whatever you want for the service.