Terms of Service

1. Acceptance of these Terms

These Terms of Service (the “Terms”) form a binding legal contract between you and Sincerus (“Sincerus,” “we,” or “us”). By creating an account, signing in, or otherwise using the Sincerus mobile app or the website at sincerus.app (together, the “Service”), you agree to these Terms, to our Privacy Policy, and to our Community Guidelines.

If you do not agree to any part of these Terms, you must not use the Service.

2. Eligibility and geographic scope

The Service is offered only to residents of the United States or Türkiye who meet the minimum age: 18 years old in both countries. You represent that you meet the eligibility requirements, that you reside in the United States or Türkiye, that you are not located in any country subject to a U.S. Government embargo or designated as a terrorist-supporting country, and that you are not listed on any U.S. Government list of prohibited or restricted parties (including OFAC's Specially Designated Nationals list).

The Service is not offered in any other country. If you are not a resident of the United States or Türkiye, you are not authorized to use the Service and must not create an account.

Age verification in Türkiye. Your account is a Turkish account if you choose Türkiye as your country or create it from the Turkish App Store. Law No. 5651 (Additional Article 4, as amended by Law No. 7578) and the age verification regulation of the Presidency's Cybersecurity Directorate (Cumhurbaşkanlığı Siber Güvenlik Başkanlığı), in force from November 1, 2026, require a Turkish account to verify its age when it is created, with an age verification token you create on e-Devlet. The token tells us only whether you are under 15, 15 to 17, or 18 or older; it carries no name, T.C. identity number, date of birth, or username. We check that it is genuine, read the age group, and use it for nothing else. Sign-ups in Türkiye open once the Directorate publishes the technical guide for the token.

If the token shows that you are under 18, we cannot open a Turkish account for you. If an existing account is shown to be 15 to 17, it is hidden and deleted after 90 days unless you appeal or verify again once you are 18. If an existing account is shown to be under 15, it is closed and its data is deleted 14 days after the decision unless an appeal is pending, or after an appeal is decided against it. If there is reasonable doubt about a Turkish account's age, we may ask it to verify again; until it does, the account is hidden and signed out. You may appeal any age decision free of charge and in Turkish; a person reviews every appeal, and nothing is deleted while an appeal is pending. You may also complain to the Cybersecurity Directorate or go to court. People who do not live in Türkiye and are only visiting are exempt from this requirement. See Age verification (Türkiye).

3. Your account

You are responsible for maintaining the confidentiality of your account credentials and for all activity that occurs under your account. You agree to provide accurate information and to update it if it changes. Each person may maintain only one personal account on Sincerus.

You can create an account with Sign in with Apple or with an email address and password; email addresses are verified with a one-time code. If you use Apple's “Hide My Email,” the relay address Apple generates is your address of record for legal notices.

4. Human verification

Every post, reply, repost, and quote on Sincerus is cryptographically attested by your iPhone through Apple App Attest, and the app asks for on-device biometric verification (Face ID, Touch ID, or your passcode) before you publish. After you confirm, the app doesn't ask again for up to five minutes while it stays open; the window ends when you leave the app. By using Sincerus, you confirm that you are a human being and that any post you publish is composed by you personally, not generated by artificial intelligence or automated software. Attempting to bypass or defeat human verification is a material breach of these Terms and grounds for permanent account termination.

5. Your content and the license you grant us

You retain ownership of the text, images, and other content you publish or send through the Service (collectively, “Your Content”). By publishing or sending Your Content, you grant Sincerus a worldwide, non-exclusive, royalty-free, sublicensable, and transferable license to host, store, cache, reproduce, publish, publicly display, publicly perform, distribute, modify (for technical purposes such as formatting), create derivative works of (for technical purposes such as translation), and communicate Your Content, solely for the purposes of operating, providing, promoting, and improving the Service and for the purposes described in our Privacy Policy.

This license terminates when Your Content is deleted, except that: (i) backup and audit copies retained for a limited period after deletion survive until those copies are purged in the ordinary course; and (ii) if you have opted in to language-corpus licensing, the pseudonymized-corpus license described in Section 8 of our Privacy Policy survives for the duration of any dataset already licensed to a third party, because we cannot claw content back out of datasets in the hands of licensees.

Direct messages

Sincerus never licenses, sells, shares, or otherwise uses the contents of your direct messages for any purpose other than delivering them to the intended recipient. Messages are end-to-end encrypted, so we can't read them; if you or the other person reports a conversation, we review only the messages attached to that report.

Your representations

You represent and warrant that you own or have all necessary rights to publish Your Content, that Your Content does not infringe any third party's intellectual property, privacy, publicity, or other rights, and that Your Content does not violate these Terms, the Community Guidelines, or applicable law.

6. Prohibited conduct

You agree that you will not, and will not attempt to:

• Use the Service for any unlawful purpose or in violation of these Terms or the Community Guidelines;
• Publish content that depicts, solicits, or promotes the sexual exploitation of a child;
• Publish content that facilitates or promotes human trafficking, sex trafficking, or the exploitation of minors;
• Publish content that advocates, glorifies, or provides material support to a designated terrorist organization;
• Harass, stalk, threaten, bully, or incite violence against any individual or group;
• Publish hate speech directed at any protected class;
• Impersonate any person or entity or misrepresent your affiliation with any person or entity;
• Use automated means, bots, scripts, scrapers, or AI to interact with the Service, generate posts, or harvest data;
• Attempt to bypass or defeat Face ID, App Attest, or any other human-verification mechanism;
• Interfere with or disrupt the integrity or performance of the Service;
• Attempt to gain unauthorized access to the Service, any account, or any system;
• Upload viruses, malware, or other harmful code;
• Reverse-engineer, decompile, or disassemble any part of the Service except where permitted by applicable law;
• Rent, lease, lend, sell, sublicense, or otherwise transfer your account;
• Collect or harvest personal information about other users;
• Use the Service in any country where Sincerus is not offered.

Sincerus has no tolerance for objectionable content or abusive users; we remove such content and suspend such accounts. We may also remove content, suspend, or terminate accounts for any other violation of this Section 6. If your account is frozen, you can submit an appeal from the app's login screen.

7. Reporting abuse and copyright

If you see content that violates these Terms or the Community Guidelines, tap the three-dot menu on the content and choose Report, or block or mute the account from its profile. Reports are reviewed by a human within 24 hours. For copyright infringement, see our DMCA Policy. For child safety, we file CyberTipline reports with the National Center for Missing & Exploited Children (NCMEC) as required by 18 U.S.C. § 2258A and preserve reported content for at least 90 days.

8. Price, Premium, ads, and refunds

Sincerus is free to download and use. On the free tier you see ads, always marked “Ad” or “Sponsored” (see “Ads and sponsored posts” below). Sincerus offers an optional paid Sincerus Premium subscription through Apple In-App Purchase, which removes ads and adds features; it never makes your posts rank higher. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Cancellations take effect at the end of the current billing period; you retain premium features until then. To cancel, go to iOS Settings → your Apple ID → Subscriptions.

All purchases are final and non-refundable except where required by applicable law. Refund requests are handled by Apple under Apple's refund policy, not by Sincerus.

Premium prices are shown in the App Store in your storefront's currency before you buy and are set by Sincerus from time to time. Applicable taxes are collected by Apple at checkout.

Ads and sponsored posts

Ads appear in feeds, on topic pages, next to search results and, now and then, full screen between screens; never in chats or on market pages. Some ads are sold by Sincerus directly and some come from Google (AdMob). A sponsored post is a real post by an account that paid Sincerus to show it to more people; it is labeled “Sponsored” and follows these Terms and the Community Guidelines like any post. You can hide an ad or an advertiser and report an ad from its menu. How ads use your information is in Section 9 of our Privacy Policy. If you post about a product or brand that paid you or gave you something, you must disclose it clearly in the post.

9. Apple App Store terms

These Terms are concluded between you and Sincerus, not between you and Apple Inc. Apple is not responsible for the Service or its content. Apple has no obligation to provide maintenance or support services for the Service. To the maximum extent permitted by law, Apple has no warranty obligation whatsoever with respect to the Service. Apple is not responsible for addressing any claims by you or any third party relating to the Service or your possession or use of the Service, including product liability, failure to conform to applicable law, and consumer protection claims.

If any third party claims that the Service or your possession and use of the Service infringe their intellectual property rights, Sincerus — not Apple — is responsible for the investigation, defense, settlement, and discharge of the claim, to the extent required by these Terms.

You represent that (a) you are not located in a country subject to a U.S. Government embargo, and (b) you are not listed on any U.S. Government list of prohibited or restricted parties. Apple and Apple's subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance of these Terms, will have the right to enforce these Terms against you as a third-party beneficiary.

The Sincerus app software itself is licensed to you under Apple's standard Licensed Application End User License Agreement (the “Apple EULA”). The Apple EULA governs your license to the app software; these Terms govern the Service. See our EULA page for how the two fit together.

10. Termination and suspension

You may stop using the Service at any time and delete your account in-app (Settings → Delete Account). Your account enters a 30-day grace period during which you can log in to cancel the deletion. After 30 days the account is permanently deleted and, if you signed up with Sign in with Apple, we revoke that authorization.

Sincerus may suspend or terminate your account, with or without notice, if we believe in good faith that you have violated these Terms, the Community Guidelines, or any applicable law; if we are required to do so by law or legal process; or if continued operation of your account could expose Sincerus or other users to liability or harm. Sections 5 (license), 11 (disclaimers), 12 (limitation of liability), 13 (indemnity), 17 (governing law), and 18 (arbitration) survive termination.

11. Disclaimers

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE. TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, SINCERUS DISCLAIMS ALL WARRANTIES, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND ANY WARRANTIES ARISING OUT OF COURSE OF DEALING, USAGE, OR TRADE.

SINCERUS DOES NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, SECURE, OR FREE OF ERRORS; THAT DEFECTS WILL BE CORRECTED; OR THAT THE SERVICE OR THE SERVERS THAT MAKE IT AVAILABLE ARE FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS.

YOU USE THE SERVICE AT YOUR OWN RISK. CONTENT PUBLISHED BY OTHER USERS IS THEIR RESPONSIBILITY, NOT SINCERUS', AND SINCERUS IS NOT LIABLE FOR THE ACCURACY, LEGALITY, OR QUALITY OF ANY USER CONTENT.

Not investment advice. Prices, charts, $SYMBOL pages, market labels and posts about stocks, crypto or other assets are information, not investment, financial, legal or tax advice, and not an offer or recommendation to buy or sell anything. Prices come from third-party providers, may be delayed or wrong, and are shown without any warranty. Sincerus is not a broker, exchange or investment adviser. Decide for yourself, and talk to a licensed professional where you need one.

Some jurisdictions do not allow the exclusion of certain warranties; the exclusions above apply to the maximum extent permitted by law.

12. Limitation of liability

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT WILL SINCERUS, ITS OFFICERS, EMPLOYEES, CONTRACTORS, OR AFFILIATES BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, INCLUDING DAMAGES FOR LOST PROFITS, LOST REVENUE, LOST DATA, LOSS OF GOODWILL, OR BUSINESS INTERRUPTION, ARISING OUT OF OR IN CONNECTION WITH THESE TERMS OR YOUR USE OF THE SERVICE, WHETHER BASED ON WARRANTY, CONTRACT, TORT (INCLUDING NEGLIGENCE), OR ANY OTHER LEGAL THEORY, AND WHETHER OR NOT SINCERUS HAS BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES.

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, SINCERUS' TOTAL LIABILITY FOR ALL CLAIMS ARISING OUT OF OR IN CONNECTION WITH THESE TERMS OR YOUR USE OF THE SERVICE WILL NOT EXCEED THE GREATER OF (A) ONE HUNDRED U.S. DOLLARS (US$100.00) OR (B) THE TOTAL AMOUNT YOU PAID TO SINCERUS, THROUGH APPLE, IN THE TWELVE MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM.

Some jurisdictions do not allow the exclusion or limitation of certain damages; the limitations above apply to the maximum extent permitted by law.

13. Indemnification

To the fullest extent permitted by applicable law, you agree to indemnify, defend, and hold harmless Sincerus, its officers, employees, contractors, and affiliates from and against any and all claims, liabilities, damages, losses, and expenses (including reasonable attorneys' fees) arising out of or in any way connected with (a) your access to or use of the Service; (b) Your Content; (c) your violation of these Terms; or (d) your violation of any third-party right, including any intellectual property or privacy right.

14. Section 230

Sincerus is a provider of an interactive computer service under 47 U.S.C. § 230 and is not the publisher or speaker of information provided by other users. We reserve the right, but have no obligation, to monitor, edit, or remove content; any actions we take or do not take in this regard do not alter the Section 230 immunity of Sincerus.

15. Intellectual property

The Service, including all software, designs, trademarks, logos, and the “Sincerus” name, are owned by Sincerus and protected by intellectual property law. Except as expressly permitted by these Terms, you may not copy, modify, distribute, sell, or lease any part of the Service.

16. Changes to the Service and to these Terms

We may change, suspend, or discontinue any aspect of the Service at any time. We may also revise these Terms from time to time. When we make a material change, we will update the “Last updated” date at the top and, where required by law or these Terms, notify you in the app or by email. Your continued use of the Service after the updated Terms take effect constitutes your acceptance.

17. Governing law and venue

These Terms are governed by the laws of the State of Delaware, United States of America, without regard to its conflict-of-laws principles. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

Subject to the binding arbitration agreement in Section 18, any action or proceeding arising out of or relating to these Terms that is not subject to arbitration (for example, a small-claims-court action) must be brought exclusively in the state or federal courts located in New Castle County, Delaware, and you consent to the personal jurisdiction of those courts.

Consumers in Türkiye

If you are a consumer residing in Türkiye, mandatory Turkish consumer law and venues apply, and nothing in these Terms takes away the protection those rules give you. In particular, the Consumer Protection Law No. 6502 applies to you regardless of the choice of law above; you may bring a Dispute before the consumer arbitration committee (tüketici hakem heyeti) within its monetary limits, or before the consumer courts (tüketici mahkemeleri) of your place of residence, subject to any mandatory mediation step under Turkish law; and Section 18 (arbitration, class-action waiver, opt-out, and jury waiver) and the exclusive New Castle County venue do not apply to you.

18. Binding arbitration and class-action waiver

This Section 18 applies to users in the United States. It does not apply to consumers in Türkiye (see Section 17).

PLEASE READ THIS SECTION CAREFULLY. IT AFFECTS YOUR LEGAL RIGHTS, INCLUDING YOUR RIGHT TO FILE A LAWSUIT IN COURT AND TO HAVE A JURY HEAR YOUR CLAIMS.

Agreement to arbitrate

Except as expressly described below, you and Sincerus agree that any dispute, claim, or controversy arising out of or relating to these Terms, your use of the Service, or Your Content (“Dispute”) will be resolved by binding individual arbitration administered by the American Arbitration Association (“AAA”) under its Consumer Arbitration Rules, rather than by a court. The arbitration will be conducted in English and, unless you and Sincerus agree otherwise, the arbitrator will decide the dispute on the basis of written submissions, telephone, or video conference.

Class-action waiver

YOU AND SINCERUS AGREE THAT EACH MAY BRING CLAIMS AGAINST THE OTHER ONLY IN YOUR INDIVIDUAL CAPACITY, AND NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY PURPORTED CLASS, COLLECTIVE, REPRESENTATIVE, OR PRIVATE ATTORNEY GENERAL ACTION. The arbitrator has no authority to consolidate more than one person's claims and no authority to preside over any form of a representative or class proceeding.

Carve-outs

• Small-claims court. You may bring an individual action in small-claims court for any Dispute that qualifies, so long as the action remains in that court and is not removed or appealed to a court of general jurisdiction.
• Intellectual-property actions. Either party may seek injunctive or other equitable relief in court to protect its intellectual property rights (for example, a DMCA-related lawsuit).

30-day opt-out

You can opt out of this arbitration agreement by sending a written notice to legal@sincerus.app within 30 days of first accepting these Terms, with the subject line “Arbitration Opt-Out.” The notice must include your full name, Sincerus username, and a clear statement that you opt out of arbitration. Opting out does not affect any other part of these Terms.

Pre-arbitration dispute resolution

Before commencing arbitration, you and Sincerus agree to attempt to resolve the Dispute informally for at least 60 days. You may commence informal resolution by sending a written notice to legal@sincerus.app describing the Dispute and the relief you seek. Sincerus will do the same by sending notice to the email address on file for your account.

Arbitration fees

Sincerus will pay the AAA filing and administrative fees for arbitrations brought by US consumer users where the amount in dispute is US$10,000 or less, unless the arbitrator determines the claim is frivolous.

Jury trial waiver

IF FOR ANY REASON A DISPUTE PROCEEDS IN COURT RATHER THAN IN ARBITRATION, EACH PARTY KNOWINGLY AND VOLUNTARILY WAIVES ANY RIGHT TO TRIAL BY JURY.

Severability and federal arbitration

This arbitration agreement is governed by the Federal Arbitration Act. If any part of this Section 18 is found to be unenforceable, the remainder will remain in effect, except that if the class-action waiver is found unenforceable with respect to a particular claim, that claim must be brought in court and all other Disputes must still be arbitrated.

19. Notices

Notices from Sincerus will be sent to the email address associated with your account or posted in the app. You consent to receiving electronic communications from us. Notices from you to Sincerus must be sent to legal@sincerus.app.

20. General

These Terms, together with the Privacy Policy and the Community Guidelines, are the entire agreement between you and Sincerus concerning the Service; the app software is separately licensed under the Apple EULA referenced in Section 9. If any provision is held unenforceable, the remainder will remain in full effect. Our failure to enforce any provision is not a waiver. You may not assign these Terms without our written consent; Sincerus may assign them freely. These Terms do not create any partnership, joint venture, employment, or agency relationship.

21. Contact

Questions about these Terms? Email legal@sincerus.app or see our Support page.