Effective Date: May 2026
1 · Introduction
These Terms of Service (“Terms”) govern your use of the Open Excel Chrome extension, website, cloud features, AI tools, and related backend services (together, the “Service”), provided by ValmisLab OÜ (“we”, “us”, “our”).
2 · Acceptance
By installing, accessing, or using the Service, you agree to be bound by these Terms. If you do not agree, do not use the Service.
3 · Description of the Service
Open Excel allows you to open, view, edit, save, and export Excel files (.xls, .xlsx) in Chrome.
The Service includes local file workflows, multi-sheet navigation, printing, downloading/exporting, optional Google Sheets export,
optional Cloud files, Version History, and optional AI tools.
Some features are free, while Pro features may require sign-in and an active paid subscription, trial, or entitlement. Feature availability, limits, pricing, and plan names may change over time.
4 · Local Processing, Storage, and User Content
By default, Excel files are processed locally in your browser. You are responsible for the files you open, edit, upload, store, process with AI, and export, and for ensuring that you have the rights to use them.
To provide Recent files, local saving, local AI history, settings, and session state, the Service may store data locally in your
browser using IndexedDB and chrome.storage.local. You can remove items from Recent or clear local browser data.
The Service may attempt compatibility repairs for certain non-standard Excel files to improve import reliability. Formatting, formulas, images, external links, macros, or other workbook features may not be preserved in all cases.
5 · Account, Authentication, and Email OTP
Some features, including editing, Cloud, AI, Pro limits, and subscription-related features, may require you to sign in. Sign-in options may include Google sign-in and Email OTP (one-time code).
If you choose Email OTP, you authorize us to send an authentication code to the email address you provide. Marketing emails are optional and only sent if you explicitly opt in.
6 · Cloud Files and Version History
If you use Cloud features, you authorize us to upload, store, retrieve, version, rename, copy, download, and delete your workbook files and related metadata as needed to provide Cloud files and Version History. Cloud storage is intended for your own files and account use and is subject to plan limits.
Each Save to Cloud may create a new version, up to the configured version limit. You are responsible for reviewing and backing up important files. We may restrict uploads, saves, restores, or other Pro actions if your subscription or entitlement is inactive, expired, canceled, or otherwise unavailable.
If your Pro access ends, we may continue to allow limited access to list, view, download, or delete existing Cloud files and versions to support data portability, while restricting creation of new cloud files or new versions.
7 · AI Tools
Open Excel AI tools may generate spreadsheet audits, cleanup suggestions, rewritten text, formulas, explanations, and patch-style recommendations. AI output may be incomplete, inaccurate, unsafe for your use case, or unsuitable for legal, financial, accounting, tax, medical, or other professional decisions.
You are responsible for reviewing all AI output before relying on it. AI patch recommendations are not applied automatically; you must explicitly choose to apply them. You are responsible for verifying formulas, values, and edits after applying any AI suggestion.
You may not use AI tools to process content that you do not have the right to use, or to generate unlawful, harmful, infringing, abusive, or deceptive content. We may limit, suspend, or refuse AI requests to protect the Service, comply with law, or prevent abuse.
8 · Google OAuth, Google APIs, and Scopes
If you choose Google sign-in or use Google Sheets export, the Service may request Google OAuth authorization. The Service requests only the permissions/scopes necessary for the specific action you choose.
userinfo.email— used for Google sign-in to retrieve your email address.-
drive.file— requested only when you click “Edit in Google Sheets” to upload the chosen file to your Google Drive and convert/open it as a Google Sheets file.
Google API Disclosure. Our use and transfer of information received from Google APIs will comply with the Google API Services User Data Policy , including the Limited Use requirements.
9 · Third-Party Services
The Service may interact with third-party services to provide functionality you request or purchase, including Google OAuth, Google Drive, Google Sheets, cloud infrastructure providers, AI providers, email delivery providers, and Paddle for payments and subscriptions. Your use of third-party services may be subject to their respective terms and policies.
10 · Subscriptions and Billing
Our order process is conducted by Paddle.com. Paddle.com is the Merchant of Record for our orders and may handle payment processing, taxes, invoicing, receipts, customer billing support, subscription management, and returns/refunds.
Subscriptions renew automatically unless canceled before the renewal date. Prices, billing periods, applicable taxes, renewals, trials, cancellation, and refund details are shown at checkout and in our Refund Policy where applicable.
You may cancel a subscription at any time through the available billing management flow or by contacting support. Unless otherwise stated at checkout or required by law, paid features remain active until the end of the current billing period, and future renewals stop after cancellation.
We may update or revoke Pro entitlements based on subscription state, payment status, trial status, refunds, chargebacks, abuse, or administrative corrections.
11 · User Rights
We grant you a non-exclusive, revocable, non-transferable license to use the Service for personal or internal business purposes, subject to these Terms.
12 · Prohibited Uses
You may not reverse-engineer, redistribute, or use the Service to violate any law, infringe third-party rights, or attempt to bypass security, usage limits, subscriptions, or access controls. You may not use the Service to send abuse traffic, spam OTP requests, overload AI or backend systems, upload malware, or interfere with the Service.
13 · Intellectual Property
All code, trademarks, logos, and Service materials remain the property of ValmisLab OÜ or its licensors. No rights are transferred to you except as expressly stated in these Terms.
14 · Disclaimer of Warranties
The Service is provided “as is” and “as available” without warranties of any kind, whether express or implied. We do not warrant that the Service will be uninterrupted, secure, error-free, or that file imports/exports, Cloud storage, Version History, AI responses, formulas, or formatting preservation will meet your requirements in all cases.
15 · Limitation of Liability
To the fullest extent permitted by law, ValmisLab OÜ shall not be liable for any indirect, incidental, special, consequential, or exemplary damages arising from or related to your use of the Service, including loss of data, loss of files, inaccurate AI output, lost profits, or business interruption.
16 · Termination
We may suspend or terminate your access to the Service if you breach these Terms, misuse the Service, fail to pay subscription fees, or create security, legal, operational, or abuse risks. You may stop using the Service at any time by uninstalling the extension.
17 · Privacy
Your use of the Service is also subject to our Privacy Policy. Please review it at privacy.html.
18 · Governing Law
These Terms are governed by the laws of Estonia. Disputes will be resolved in Harju County Court, Tallinn.
19 · Changes
We may update these Terms from time to time. Continued use of the Service after changes constitutes acceptance of the updated Terms. Updates will be posted with a revised effective date.
20 · Contact
Email: valmislab.studio@gmail.com · Address: Tornimäe 7, 10145 Tallinn, Estonia.