Effective Date: September 2026
1 · Introduction
These Terms of Service (“Terms”) govern your use of the OpenExcel 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, and edit spreadsheet files (.xls, .xlsx, .csv) in Chrome and save or export them as .xlsx.
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.
Viewing is available without a paid purchase. Signed-in Free accounts may edit up to three distinct spreadsheets and receive a starting AI allowance. Current limits and paid offers are displayed in the extension and on the Pricing page.
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. Keep independent backups of important files.
5 · Account, Authentication, and Email OTP
Editing allowances, Cloud, AI, purchases, and account-based entitlements 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 · Free Editing and Plus Lifetime
A signed-in Free account can edit up to three distinct spreadsheets. A spreadsheet is counted when its first edit is registered. Saving another copy of the same recognized workbook does not intentionally consume another slot, although materially different files may be treated as separate spreadsheets.
OpenExcel Plus Lifetime is a one-time purchase, not a subscription, and has no automatic renewal. It provides unlimited spreadsheet editing and the Cloud and Version History limits shown at checkout and on the Pricing page. “Lifetime” means for as long as the applicable OpenExcel product and Service are offered and the purchasing account remains active and in good standing; it does not mean the natural lifetime of a person or guarantee that every feature will remain unchanged forever.
Plus Lifetime is attached to the OpenExcel account used at checkout. It is not transferable or redeemable for cash. Eligible pre-launch or manually granted accounts may receive equivalent or time-limited access under separate legacy or administrative terms.
7 · 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 write operations if the relevant entitlement is unavailable or a storage limit is reached.
If paid or legacy Cloud 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.
8 · AI Tools and AI Actions
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.
AI use is measured in actions. An action is deducted only after an AI request completes successfully. Eligible accounts may receive free actions; Plus Lifetime and eligible legacy or administrative accounts may have their available balance restored to a minimum monthly amount. Unused free actions do not accumulate above that minimum.
One-time AI action packages are available to signed-in users with or without Plus. Purchased actions do not expire during normal operation and are consumed after free actions. Actions are account-bound, non-transferable, have no cash value, and cannot be used outside the Service. Refunds, chargebacks, account termination, or abuse may result in removal of related unused actions.
9 · 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.
10 · 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. Your use of third-party services may be subject to their respective terms and policies.
11 · Purchases, Billing, and Refunds
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, and returns/refunds. We do not receive or store your full payment-card number.
Current OpenExcel Plus Lifetime and AI action packages are one-time purchases with no recurring charge or automatic renewal. The exact product, price, currency, taxes, and total charge are displayed before you confirm a purchase.
Purchases are governed by these Terms together with the terms shown at checkout, our Refund Policy, and Paddle’s applicable Buyer Terms and Refund Policy. A completed refund or chargeback may cause the associated Plus entitlement or unused purchased AI actions to be revoked.
We may update or revoke paid entitlements based on payment status, refunds, chargebacks, abuse, or administrative corrections.
Historical subscription products are no longer part of the current offer. If a historical subscription remains active, its renewal and cancellation terms remain those shown when it was purchased and in Paddle’s buyer portal until it is canceled, expires, or replaced.
12 · 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.
13 · 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, purchases, 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.
14 · 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.
15 · 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.
16 · 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. Nothing in these Terms excludes liability or consumer rights that cannot lawfully be excluded.
17 · Termination
We may suspend or terminate your access to the Service if you breach these Terms, misuse the Service, engage in fraud or payment abuse, or create security, legal, operational, or abuse risks. You may stop using the Service at any time by uninstalling the extension.
18 · Privacy
Your use of the Service is also subject to our Privacy Policy. Please review it at privacy.html.
19 · Governing Law
These Terms are governed by the laws of Estonia. Subject to mandatory consumer rights in your country, disputes concerning the Service will be resolved in Harju County Court, Tallinn. Paddle transactions are also subject to the governing-law and dispute provisions in Paddle’s Buyer Terms.
20 · 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.
21 · Contact
Email: valmislab.studio@gmail.com · Address: Tornimäe 7, 10145 Tallinn, Estonia.