Arcanum Commerce OS
Watch, act, and prove impact on one store timeline.
Hollow Sentinel is your morning operator. Arcanum Engine installs commerce systems that own a revenue outcome. Together — still as separate Shopify apps — they close the loop without forcing you to buy both.
The closed loop
Watch → Act → Prove
Most Shopify stacks split monitoring from automation. You get dashboards that never change checkout, or workflows that fire without a clear dollar story. Commerce OS is the optional upgrade path when Sentinel and Engine are installed on the same store: one timeline for what changed, what you did, and what it was worth.
Watch
Daily briefings, Store Memory, anomaly signals, and dollar Revenue At Risk so your team sees what changed before it becomes a bigger problem.
Act
Install Engine playbooks and commerce systems from Sentinel signals — with safe defaults you confirm — instead of wiring another DIY Flow board.
Prove
The same Impact Ledger dollars appear in Engine Results and Sentinel closed-loop cards, so ops and growth share one evidence trail.
Separate apps. Optional upgrade story.
Buy what you need first.
Each app works alone. Start with Sentinel if you need visibility, Engine if you need action, Reserve if you sell appointments, or Studio Arcana if you need a service-led storefront. Commerce OS is the narrative and bundle path when you want watch and act on one timeline — not a locked suite.
Beauty stack path: Studio Arcana → Hollow Reserve → Arcanum Engine → Hollow Sentinel — or pick any single product that matches your next constraint.
Who Commerce OS is for
Operators who outgrew disconnected tools.
Commerce OS fits merchants and agencies who already feel the gap between “we saw it in analytics” and “we fixed it in Admin” — and want a clearer story for leadership about what the stack is doing.
- Ops-led teams — Need morning briefings and playbooks without maintaining a sprawling Flow canvas.
- Growth operators — Want ranked opportunities and directional impact, not vanity dashboards.
- Service businesses — Pair booking and storefront systems with monitoring and automation as you scale.
- Agencies — Need a coherent Arcanum Hollow story when recommending apps alongside services.
Ecosystem bundles
Matched Sentinel + Engine tiers cost less than buying both separately. Bundle SKUs roll out on the Shopify App Store as combined subscriptions become available.
Ecosystem bundles
| Package | Investment | If bought separately | Includes |
|---|---|---|---|
| Arcanum Essentials | $49/month | $58/month | Arcanum Engine Starter · Hollow Sentinel Starter |
| Arcanum Growth | $169/month | $207/month | Arcanum Engine Growth · Hollow Sentinel Growth · Hollow Reserve Starter |
| Arcanum Commerce OS | $479/month | $507/month | Arcanum Engine Ops · Hollow Sentinel Scale · Hollow Reserve Professional · Premium reporting |
Explore the products
Commerce OS is the ecosystem story. Each product still has its own lander, pricing, and documentation.
Commerce OS FAQ
Answers for merchants comparing separate apps, bundles, and the closed-loop story.
What is Arcanum Commerce OS?
Commerce OS is the ecosystem name for running Hollow Sentinel and Arcanum Engine together on one store timeline — watch, act, and prove — while each app remains separately installable.
Do I need both apps?
No. Start with the product that matches your biggest constraint. Commerce OS is optional when you want both monitoring and action-ready playbooks.
How do bundles compare to buying separately?
Ecosystem bundles price matched Sentinel and Engine tiers below the sum of à la carte plans. Separate plans remain available anytime.
Does Commerce OS include Reserve or Studio Arcana?
Those products are part of the broader Arcanum Hollow stack and often pair with Engine and Sentinel, but Commerce OS specifically names the watch/act/prove loop between Sentinel and Engine.
When should I start with Commerce OS?
When your team already feels the handoff gap between alerts and action, or when you want a clearer ROI story across monitoring and automation.
Still deciding?
Tell us what is breaking in ops or growth — we will point you at the right product or bundle.