Terms of Service

^{Last updated: 06/05/2026}

Welcome to Diglot. These Terms of Service (“Terms”) form a binding agreement between you (“you”, “User”) and Diglot OÜ, a private limited company registered in the Republic of Estonia (“Diglot”, “we”, “us”, “our”). They govern your access to and use of the Diglot website at diglot.ai, the Diglot web editor, browser extensions, desktop and mobile apps, the Authorship Certificate feature, and any related services we make available (collectively, the “Service”).

By creating an account, clicking “I agree”, or using the Service, you confirm that you have read, understood, and agreed to these Terms and to our Privacy Policy. If you do not agree, do not use the Service.

1. Eligibility and account

To use the Service, you must be at least 16 years old (or the age of digital consent in your country) and able to enter into a binding contract under your local law. If you are between 16 and 18, you confirm that your parent or legal guardian has reviewed and accepted these Terms on your behalf.

You are responsible for: (a) providing accurate registration information; (b) keeping your password and authentication factors confidential; (c) all activity that occurs under your account; and (d) notifying us promptly at support@diglot.ai if you suspect unauthorized access. We may require email or phone verification, and we may decline, suspend, or close accounts that we reasonably believe are fraudulent, duplicate, or in breach of these Terms.

2. Description of the Service

Diglot is a bilingual writing assistant designed primarily for ESL (“English as a Second Language”) writers. Features may include translation, grammar and style suggestions, paraphrasing, plagiarism preview, AI-generated detection (“AI Check”), citation tools, the Cowriter agent, and the Authorship Certificate. The Service is intended to assist your writing — it is not a source of truth, legal advice, academic advice, medical advice, or professional counsel.

We routinely improve, change, or discontinue features. We will give reasonable notice of material changes that adversely affect paid functionality. Beta or experimental features may be removed without notice.

3. Generative AI: accuracy disclaimer

The Service uses third-party generative artificial intelligence models (including, without limitation, models from OpenAI, Anthropic, and Google) to produce outputs. You acknowledge and agree that:

Outputs may contain errors, inaccuracies, fabrications, or outdated information — commonly called “hallucinations”.
The Service is a writing assistant for educational and personal use, not a definitive source of truth and not a substitute for professional advice.
You must independently review and verify any output before relying on it for academic submissions, professional work, citations, legal filings, medical decisions, or any other consequential use.
We do not warrant that outputs will be accurate, complete, current, fit for any particular purpose, or non-infringing.
Reliance on any output is at your sole risk.

Where required by applicable law (including the EU AI Act), the Service surfaces just-in-time notices when AI is used to generate content. You agree not to disable or obscure those notices.

4. Authorship Certificate (Proof of Process)

The Authorship Certificate is an optional feature that records technical telemetry observed inside the Diglot editor — for example, keystroke dynamics, time spent, edit cadence, and the absence or presence of large paste operations. It produces a signed log we call Proof of Process (“PoP”).

You expressly acknowledge that:

The Certificate is a technical log of events observed within the Diglot interface only. It does not capture activity outside the editor (including external AI tools, dictation, or assistance from another person).
The Certificate is not a legal warranty of originality, authorship, or copyright ownership.
The Certificate does not guarantee that any third party — including a school, university, employer, journal, court, or accreditation body — will accept it as proof of human authorship or as compliant with their academic-integrity, anti-plagiarism, or AI policies.
Diglot disclaims all liability for any academic, disciplinary, employment, or contractual action taken against you in connection with work for which a Certificate was or was not issued.

5. User content and license to Diglot

“User Content” means any text, drafts, prompts, instructions, files, and documents you input into the Service or generate through it.

You retain all ownership of your User Content. You grant Diglot a worldwide, non-exclusive, royalty-free license to host, store, transmit, process, display, and create derivative works of your User Content solely to the extent necessary to (a) operate, secure, and improve the Service for you, (b) provide the features you request, and (c) comply with law. We will not sell your User Content. We will not use the substantive text of your User Content to train third-party foundation models. Aggregated, fully de-identified usage signals may be used to improve our own product, consistent with the Privacy Policy.

You represent and warrant that you have all rights necessary to submit your User Content to the Service and that your User Content does not infringe the rights of any third party.

6. Acceptable Use Policy

You agree not to, and not to permit any other person to:

violate any applicable law or regulation, or any third party’s rights;
upload content that is unlawful, defamatory, obscene, harassing, infringing, or that contains malware;
use the Service to generate spam, phishing, harassment, child sexual abuse material, or content designed to deceive about its origin in a manner prohibited by law;
attempt to reverse-engineer, decompile, or extract the source code of the Service, except to the extent expressly permitted by mandatory law;
attempt to bypass rate limits, access controls, safety filters, or the Service’s metering or billing systems;
use the Service to develop a competing product, or to scrape, mirror, or repackage Diglot outputs;
impersonate another person, misrepresent your affiliation, or share an account beyond what your subscription permits;
submit personal data of others without a lawful basis to do so.

We may remove content, throttle features, or suspend accounts that we reasonably believe breach this Section.

7. Subscriptions, billing, and Merchant of Record

7.1 Plans

We offer free and paid plans (currently Free, Spark, and Pro, plus B2B / education plans). Plan features, quotas, and prices are described on our pricing page and may change prospectively, with notice of any material change to existing paid plans.

7.2 Merchant of Record

All paid transactions are processed by our authorized Merchant of Record (“MoR”), Polar Software Inc. and/or its affiliates (operating as Polar.sh). When you purchase a subscription, your contract of sale for that transaction is with Polar, who acts as the legal reseller of the Service. By subscribing, you also agree to be bound by Polar’s Buyer Terms.

Polar is solely responsible for: tax calculation and remittance (including EU VAT, US sales tax, GST, and similar), payment processing, chargebacks, and refund processing. Diglot remains solely responsible for the provision, support, and maintenance of the Service.

Billing inquiries, refund requests, and payment disputes should be sent to support@polar.sh. Service inquiries should be sent to support@diglot.ai.

7.3 Auto-renewal and Click-to-Cancel

Paid subscriptions renew automatically at the end of each billing period (monthly or annually) at the then-current price, until cancelled. We will tell you, at the point of purchase and in your confirmation email, the renewal cadence, the amount, and how to cancel.

You can cancel at any time, at least 24 hours before the renewal date, by:

opening your Diglot account → Settings → Billing → Cancel subscription, or
contacting support@polar.sh.

Cancellation is designed to be as simple as sign-up, in line with the U.S. FTC “Click-to-Cancel” / Negative Option Rule. Cancellation takes effect at the end of the current paid period; you keep paid features until then.

7.4 Refunds and right of withdrawal

EU / EEA / UK consumers have a statutory 14-day right of withdrawal from the date the contract is concluded. By starting to use the paid digital Service during this period, you expressly consent to immediate performance and acknowledge that you lose the right of withdrawal once the Service has been substantially performed.
Outside the statutory withdrawal window, fees already paid are non-refundable except where required by mandatory local consumer law or where we (or Polar) explicitly grant a goodwill refund.
We do not pro-rate refunds for partial billing periods.

8. Termination and data export

8.1 By you

You may stop using and close your account at any time from Settings → Account → Delete account, or by emailing support@diglot.ai.

8.2 By us

We may suspend or terminate your access, with or without notice, if we reasonably believe that: (a) you have materially breached these Terms or the Acceptable Use Policy; (b) your account is being used to commit fraud, abuse, or to threaten the security of the Service or its users; or (c) we are required to do so by law, regulator, or upstream provider.

After termination — by you or by us — you have thirty (30) days to request and download an export of your User Content (including drafts and any Authorship Certificates) in a structured, machine-readable format. After this 30-day window, we have no further obligation to retain your User Content and may delete it under our retention policy, subject to any legal hold.

Some derived data (security logs, billing records, audit trails) is retained longer where required by law or for fraud prevention.

9. Diglot’s intellectual property

The Service, including its software, design system, interface, branding, the Diglot name, and the Diglot logo, is owned by Diglot OÜ and its licensors and is protected by intellectual-property law. Subject to your compliance with these Terms and your subscription, we grant you a limited, non-exclusive, non-transferable, revocable license to use the Service for your personal, internal, or organizational use as permitted by your plan. No other rights are granted.

You may not use the Diglot name, logo, or trademarks without our prior written consent, except for fair, factual references (for example, in a CV or research paper).

10. Third-party services

The Service integrates third-party providers, including AI model providers (OpenAI, Anthropic, Google, and others listed in our Subprocessors page), Polar (MoR), Supabase (hosting / database), and others. Your use of those providers’ services through Diglot is also subject to their terms. We are not responsible for the acts, omissions, content, or availability of third-party services.

11. Disclaimer of warranties

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE”, WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ACCURACY, OR THAT THE SERVICE WILL BE UNINTERRUPTED, SECURE, OR ERROR-FREE. WE DO NOT WARRANT THAT AI-GENERATED OUTPUTS WILL BE ACCURATE, COMPLETE, ORIGINAL, OR FIT FOR ANY PARTICULAR ACADEMIC, PROFESSIONAL, OR OFFICIAL USE.

NOTHING IN THIS SECTION LIMITS YOUR RIGHTS UNDER MANDATORY CONSUMER LAW (FOR EXAMPLE, THE EU CONSUMER RIGHTS DIRECTIVE OR AUSTRALIAN CONSUMER LAW), WHICH MAY GIVE YOU RIGHTS THAT CANNOT BE EXCLUDED.

12. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW:

(a) Excluded damages. IN NO EVENT WILL DIGLOT, ITS AFFILIATES, OFFICERS, EMPLOYEES, AGENTS, OR LICENSORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR LOSS OF PROFITS, REVENUE, GOODWILL, REPUTATION, DATA, OR OPPORTUNITIES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THIS INCLUDES, WITHOUT LIMITATION, LOSSES ARISING FROM AI HALLUCINATIONS, INACCURATE TRANSLATIONS, ACADEMIC OR DISCIPLINARY DECISIONS BY THIRD PARTIES, OR REJECTION OF AN AUTHORSHIP CERTIFICATE.

(b) Aggregate cap. DIGLOT’S TOTAL AGGREGATE LIABILITY ARISING OUT OF OR RELATING TO THESE TERMS OR THE SERVICE — WHETHER IN CONTRACT, TORT (INCLUDING NEGLIGENCE), STATUTE, OR OTHERWISE — WILL NOT EXCEED THE GREATER OF: (i) THE TOTAL AMOUNT YOU PAID TO DIGLOT (OR TO POLAR FOR THE SERVICE) IN THE TWELVE (12) MONTHS IMMEDIATELY BEFORE THE EVENT GIVING RISE TO THE CLAIM; OR (ii) ONE HUNDRED U.S. DOLLARS (US $100.00).

(c) Mandatory law. Nothing in these Terms excludes or limits liability that cannot be excluded or limited under applicable mandatory law (including liability for fraud, gross negligence, willful misconduct, death or personal injury caused by negligence, or non-excludable consumer guarantees).

13. Indemnification

You agree to defend, indemnify, and hold harmless Diglot and its affiliates from any third-party claim, demand, or proceeding, and any related losses, damages, and reasonable legal fees, arising out of or related to: (a) your User Content; (b) your breach of these Terms or of any applicable law; or (c) your misuse of the Service. We will notify you promptly of any such claim, give you reasonable cooperation, and not settle without your consent (not unreasonably withheld). This Section does not apply to consumers to the extent prohibited by mandatory local law.

14. Governing law and dispute resolution

These Terms are governed by the laws of the Republic of Estonia, without regard to conflict-of-laws rules, and excluding the United Nations Convention on Contracts for the International Sale of Goods.

Any dispute, controversy, or claim arising out of or in connection with these Terms or the Service will be submitted to the exclusive jurisdiction of the Harju County Court (Harju Maakohus) in Tallinn, Estonia, except:

EU / EEA / UK consumers may also bring proceedings in the courts of their country of habitual residence, and may invoke the mandatory consumer-protection law of that country;
U.S. residents agree, to the maximum extent permitted by applicable law, that any dispute will be resolved on an individual basis only and that you waive any right to participate in a class action, class arbitration, or representative proceeding;
EU consumers may also use the European Commission’s Online Dispute Resolution platform.

Before starting formal proceedings, please contact us at support@diglot.ai so we can try to resolve the issue informally.

15. Changes to the Terms

We may update these Terms to reflect changes to the Service, to law, or to our business. If a change is material, we will give you at least thirty (30) days’ notice by email and / or in-product notice before it takes effect, and will display the updated “Last updated” date at the top of this page. Your continued use of the Service after the effective date is your acceptance of the updated Terms. If you do not agree, you may cancel your subscription and stop using the Service before the change takes effect.

16. Miscellaneous

Entire agreement. These Terms, the Privacy Policy, the Cookie Policy, the Acceptable Use Policy, the DPA (where applicable), and any plan-specific terms form the entire agreement between you and Diglot regarding the Service.
Severability. If any provision is held unenforceable, the remaining provisions remain in effect, and the unenforceable provision will be replaced by an enforceable one closest to the original intent.
No waiver. Our failure to enforce a right is not a waiver of it.
Assignment. You may not assign these Terms without our written consent. We may assign these Terms to an affiliate or in connection with a merger, acquisition, or sale of assets, on notice to you.
Force majeure. Neither party is liable for delay or failure due to events beyond reasonable control, including natural disasters, war, civil unrest, internet or upstream-provider failures, or government action.
Notices. Legal notices to us must be sent to legal@diglot.ai. We may give you notice by email to the address on your account or by an in-product message.
Language. These Terms are written in English. Translations are provided for convenience; in case of conflict, the English version prevails.

17. Contact

Diglot OÜ Registered in the Republic of Estonia General support: support@diglot.ai Legal & privacy: legal@diglot.ai Billing (Merchant of Record): support@polar.sh

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