Last Updated: June 1, 2026
IF YOU DO NOT AGREE TO THIS AGREEMENT, DO NOT ACCESS OR USE THE SOFTWARE OR DOCUMENTATION. BY CHECKING “ACCEPT,” CREATING AN ACCOUNT, OR ACCESSING THE SOFTWARE, YOU AGREE TO BE BOUND BY THIS AGREEMENT.
This Software License Agreement (“Agreement”) is a binding agreement between eStack, Inc., a Delaware corporation registered as a foreign corporation in the State of Washington with offices at 2120 1st Avenue N, Unit B-6, Seattle, WA 98109 (“Licensor,” “eStack,” “we,” or “us”) and the person or entity identified during account registration or on the applicable subscription order form (“Licensee,” “you,” or “your”).
“Software” means eStack’s hosted SaaS platform for multi-channel inventory management, order management, demand planning, purchase order automation, shipping label generation, sales reporting, and related features, including all web and mobile interfaces, APIs, and documentation.
“Subscription Plan” means the tier, term, and entitlements selected by Licensee at the time of purchase, as described on the Pricing page. Current tiers are: Essentials, Professional, and Enterprise.
“Order Form” means the online subscription or plan selection identifying fees, term, and entitlements.
“Customer Data” means all data, content, and information submitted by Licensee or its Authorized Users through the Software.
“Authorized Users” means the number of individual users permitted under Licensee’s Subscription Plan.
“Documentation” means any user guides, help articles, and technical materials made available by eStack.
Subject to payment of applicable fees and compliance with this Agreement, eStack grants Licensee a non-exclusive, non-transferable, non-sublicensable right during the Subscription Term to access and use the Software solely for Licensee’s internal business purposes in accordance with the Documentation and the limits of the applicable Subscription Plan.
Access to features and usage limits is determined by Licensee’s active Subscription Plan:
| Feature | Essentials | Professional | Enterprise |
|---|---|---|---|
| Orders per month | Up to 1,000 | Unlimited | Unlimited |
| SKUs | Up to 500 | Unlimited | Unlimited |
| Authorized Users | 1 | 3 | Unlimited |
| Sales Channels | 2 | 4 | Unlimited |
| Inventory Locations | 100 | 1,000 | Unlimited |
Full feature details are available at estack.com/pricing. eStack reserves the right to update plan features with reasonable notice.
Licensee shall not:
Fees are set out on the Order Form and on our Pricing page. Fees are payable in advance, monthly or annually depending on the selected Subscription Plan. All fees are non-refundable except as expressly stated in this Agreement.
Subscriptions automatically renew at the end of each billing period at the then-current rates unless cancelled before the renewal date. We will provide notice of any fee increases at least 30 days before they take effect.
If Licensee cancels an annual subscription within 30 days of the annual renewal date, eStack will refund prepaid fees on a pro-rated basis for unused complete months, excluding any one-time setup fees or overages. Monthly subscriptions are not refunded for partial periods.
Licensee is responsible for all taxes, duties, and levies imposed by any taxing authority on the fees paid, excluding eStack’s income taxes. Where eStack is required by law to collect VAT, GST, or similar taxes, these will be added to the invoice.
Licensee owns all Customer Data. eStack processes Customer Data only to provide the Software, support, and as described in the Privacy Policy. Licensee grants eStack a limited license to process Customer Data for these purposes. Licensee represents that it has all necessary rights and consents to upload Customer Data to the Software.
eStack will process personal data contained in Customer Data in accordance with applicable data protection law, including GDPR, UK GDPR, and the Swiss revFADP where applicable. Upon request, eStack will enter into a Data Processing Agreement (DPA) with Licensee.
eStack retains all right, title, and interest in and to the Software, including all intellectual property rights. Nothing in this Agreement transfers ownership of the Software to Licensee. eStack® is a registered trademark of eStack, Inc.
Licensee retains all right, title, and interest in and to Customer Data.
eStack provides standard email and in-app support to all Subscribers. Enterprise plan customers receive priority support and a dedicated account manager as described on the Pricing page. eStack may deploy updates, patches, and new features to the Software automatically. Updates are deemed part of the Software and subject to this Agreement.
This Agreement commences on the date Licensee first accesses the Software and continues for the Subscription Term set out in the Order Form, renewing automatically unless cancelled.
Either party may terminate this Agreement with 14 days’ written notice for uncured material breach. eStack may terminate immediately for non-payment, violation of Section 4, or insolvency.
Upon termination, Licensee’s right to access the Software ceases. Customer Data will be available for export for 30 days following termination and then permanently deleted. Sections 4, 6, 7, 10, 11, 12, and 13 survive termination.
THE SOFTWARE IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED. ESTACK DOES NOT WARRANT THAT THE SOFTWARE WILL BE ERROR-FREE, UNINTERRUPTED, OR FREE FROM HARMFUL COMPONENTS. ESTACK DISCLAIMS ALL IMPLIED WARRANTIES INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
NEITHER PARTY SHALL BE LIABLE FOR INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES. ESTACK’S AGGREGATE LIABILITY ARISING FROM OR RELATED TO THIS AGREEMENT SHALL NOT EXCEED THE FEES PAID BY LICENSEE TO ESTACK IN THE TWELVE MONTHS PRECEDING THE CLAIM, EXCEPT FOR PAYMENT OBLIGATIONS, BREACH OF SECTION 4, OR WILLFUL MISCONDUCT.
Some jurisdictions do not permit limitations on certain types of liability. In such jurisdictions, eStack’s liability is limited to the maximum extent permitted by applicable law.
This Agreement is governed by the laws of the State of Washington, U.S.A., without regard to conflict of law principles. Any dispute shall be resolved by binding arbitration in Seattle, WA, administered by the American Arbitration Association, except either party may seek injunctive relief in court.
EU and UK Licensees
Nothing in this Agreement limits mandatory rights under EU or UK law. Licensees in the EU or UK may also have recourse to their local courts or alternative dispute resolution bodies under applicable mandatory law.
Swiss Licensees
For Licensees located in Switzerland, this Agreement is additionally subject to applicable Swiss law where mandatory. Data processing matters are governed by the revFADP.
This Agreement, together with the Order Form, Terms of Service, and Privacy Policy, constitutes the entire agreement between the parties regarding the Software and supersedes all prior agreements. No assignment by Licensee without eStack’s prior written consent. eStack may assign this Agreement in connection with a merger, acquisition, or sale of assets. If any provision is held invalid, the remaining provisions continue in full force.
eStack, Inc.
2120 1st Avenue N, Unit B-6
Seattle, WA 98109 — United States
Email: support@estack.com
Phone: +1 (206) 890-0196
Impressum / Legal Notice
eStack, Inc. — a Delaware corporation registered as a foreign corporation in the State of Washington
2120 1st Avenue N, Unit B-6 — Seattle, WA 98109 — United States
Phone: +1 (206) 890-0196 ·
Email: support@estack.com
eStack® is a registered trademark of eStack, Inc.
EU/UK GDPR & Swiss revFADP inquiries: support@estack.com