Terms of Use

Effective Date: April 4, 2026  |  Last Updated: April 4, 2026

These Terms of Use ("Terms") constitute a legally binding agreement between you ("you," "your," or "User") and Halis Bilal Kara / Euler Soft ("Euler Soft," "we," "us," or "our"), governing your access to and use of all iOS mobile applications published under the "Euler Soft" developer name on the Apple App Store (collectively, the "Apps") and the Euler Soft website (the "Site").

The Apps governed by these Terms are: Blood Sugar Tracker – Glucose; Plant Identifier & Water Diary; Insect Identifier: Bug & Bite; Antique: Identify & Value; Baseball Card Value Scanner; Blood Pressure: Diary & Log; Card Centering Calculator; Intermittent Fasting Tracker; Class Planner & AI Math Solver; Pitch Counter – Radar Gun; and Birth Control Reminder – Pill.

BY DOWNLOADING, INSTALLING, OR USING ANY OF OUR APPS, YOU REPRESENT THAT YOU ARE AT LEAST 13 YEARS OF AGE (OR 16 IN JURISDICTIONS WHERE A HIGHER AGE OF DIGITAL CONSENT APPLIES), THAT YOU HAVE THE LEGAL CAPACITY TO ENTER INTO THIS AGREEMENT, AND THAT YOU UNCONDITIONALLY ACCEPT AND AGREE TO BE BOUND BY THESE TERMS. IF YOU DO NOT AGREE TO THESE TERMS, DO NOT DOWNLOAD, INSTALL, OR USE OUR APPS.

1. License Grant and Restrictions

1.1 Limited License

Subject to your compliance with these Terms, Euler Soft grants you a limited, non-exclusive, non-transferable, non-sublicensable, revocable license to download and install a copy of each App on Apple-branded devices that you own or control, and to use the App solely for your personal, non-commercial purposes, in accordance with these Terms and the Usage Rules set forth in the Apple Media Services Terms and Conditions (the "Apple EULA," available at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ).

1.2 License Restrictions

You agree that you will not, and will not permit any third party to:

1.3 Reservation of Rights

Euler Soft reserves all rights not expressly granted to you in these Terms. No implied licenses are granted. Your license to use any App terminates automatically if you fail to comply with any provision of these Terms.

2. Critical Health and Medical Disclaimer

2.1 Not a Medical Device

THE FOLLOWING APPS ARE INTENDED SOLELY AS PERSONAL TRACKING AND LOGGING TOOLS AND ARE NOT MEDICAL DEVICES, CLINICAL DECISION SUPPORT SOFTWARE, OR DIGITAL THERAPEUTICS UNDER ANY APPLICABLE REGULATORY FRAMEWORK: Blood Sugar Tracker – Glucose; Blood Pressure: Diary & Log; Intermittent Fasting Tracker; Birth Control Reminder – Pill.

2.2 No Medical Advice

Nothing in any of our Apps, or any output, result, recommendation, reminder, chart, trend, analysis, or notification generated by any App, constitutes or is intended to constitute medical advice, medical diagnosis, clinical assessment, treatment recommendation, prescription guidance, or any other form of professional healthcare advice. The Apps do not replace the professional judgment of a licensed physician, endocrinologist, cardiologist, dietitian, pharmacist, or any other qualified healthcare provider.

2.3 Blood Glucose and Diabetes

Blood Sugar Tracker – Glucose is designed to help users log blood glucose readings and observe trends over time. It is not a replacement for a clinically approved continuous glucose monitor (CGM) or blood glucose meter, does not provide clinically validated reference ranges or alarm thresholds, and must not be used to make insulin dosing decisions or other diabetes management decisions without the express guidance of a qualified healthcare provider.

2.4 Blood Pressure

Blood Pressure: Diary & Log is designed to help users log manually measured blood pressure readings. The App does not measure blood pressure independently, does not calibrate or validate readings entered by the user, and must not be used to diagnose hypertension, hypotension, or any cardiovascular condition. Do not adjust or discontinue antihypertensive medications based on App data without consulting a qualified healthcare provider.

2.5 Medication Reminders

Birth Control Reminder – Pill is designed solely as a convenience reminder tool. It is not a substitute for reading and following the prescribing information for your specific contraceptive medication. Reminder accuracy depends on your device settings, notification permissions, and Do Not Disturb configurations. Euler Soft is not liable for any missed dose, contraceptive failure, or related consequence arising from the App's failure to deliver a notification. Consult your prescribing physician or pharmacist for all medical guidance regarding your contraceptive regimen.

2.6 Fasting and Nutrition

Intermittent Fasting Tracker provides tools for tracking fasting windows and food intake schedules. It does not provide medical nutrition advice. Extended fasting may be contraindicated for individuals with certain medical conditions. Consult a physician or registered dietitian before adopting any fasting regimen, particularly if you have diabetes, a history of eating disorders, are pregnant or breastfeeding, or are taking prescription medications.

2.7 Emergency Situations

IN THE EVENT OF A MEDICAL EMERGENCY, DO NOT RELY ON ANY EULER SOFT APP. CALL YOUR LOCAL EMERGENCY SERVICES IMMEDIATELY (e.g., 112 in Turkey and the EU; 911 in the United States; 999 in the United Kingdom).

3. AI and Identification Features Disclaimer

3.1 AI Outputs Are Estimates Only

The following Apps use artificial intelligence and machine learning models to provide identification, analysis, or value estimation results: Plant Identifier & Water Diary; Insect Identifier: Bug & Bite; Antique: Identify & Value; Baseball Card Value Scanner; Class Planner & AI Math Solver. All outputs generated by AI or machine learning features within these Apps — including but not limited to species identifications, insect classifications, antique attributions, card values, and math solutions — are estimates only and are provided for informational and convenience purposes.

3.2 No Accuracy Guarantee

AI identification results may be incorrect, incomplete, out-of-date, or inapplicable to your specific situation. We make no representation or warranty regarding the accuracy, reliability, completeness, or fitness for any particular purpose of any AI-generated output. Model performance varies based on image quality, lighting conditions, angle, regional species variations, and other factors beyond our control.

3.3 Safety — Insects and Plants

DO NOT USE INSECT IDENTIFIER: BUG & BITE OR PLANT IDENTIFIER & WATER DIARY TO MAKE SAFETY DECISIONS. AI identification results must not be used to determine whether an insect bite or sting requires medical attention, whether a plant is safe to consume, or whether a plant or insect presents a danger to human health. Always consult a qualified medical professional, poison control center (e.g., Turkey: 114; US: 1-800-222-1222), or expert entomologist / botanist for safety-critical decisions.

4. Financial Disclaimer

4.1 Value Estimates Are Informational Only

Antique: Identify & Value and Baseball Card Value Scanner provide estimated values for collectibles, antiques, and trading cards based on AI analysis and available reference data. These estimates are not appraisals, certified valuations, or investment advice. Actual market values fluctuate based on condition, provenance, regional market conditions, and buyer demand.

4.2 No Reliance for Financial Decisions

Do not rely on value estimates generated by our Apps to make purchase, sale, insurance, estate planning, tax reporting, or any other financial or legal decisions. For legally binding valuations, consult a certified professional appraiser. Euler Soft is not liable for any financial loss, tax liability, or other consequence arising from reliance on App-generated value estimates.

5. Subscriptions and In-App Purchases

5.1 Paid Features

Certain Apps offer premium features accessible through auto-renewable subscriptions or one-time in-app purchases ("IAP") offered through the Apple App Store. All transactions are processed exclusively by Apple Inc. Euler Soft does not collect, store, or process your payment card information.

5.2 Auto-Renewal

Subscriptions automatically renew for the same duration and at the same price (or the current applicable price if a promotional rate has expired) unless you cancel at least twenty-four (24) hours before the end of the then-current subscription period. Your Apple ID account will be charged for renewal within twenty-four (24) hours prior to the end of the current period.

5.3 Cancellation

You may manage or cancel subscriptions at any time through your Apple ID settings at Settings > [Your Name] > Subscriptions, or via the Apple App Store. Cancellation takes effect at the end of the then-current billing period; you will retain access to premium features until that date.

5.4 Refund Policy

All subscription and IAP transactions are subject to Apple's refund policies. To request a refund, visit reportaproblem.apple.com or contact Apple Support directly. Euler Soft has no authority to issue refunds for transactions processed through the Apple App Store.

5.5 Price Changes

We reserve the right to change subscription pricing at any time. Apple will notify you of any price increase before it takes effect and will require your consent to the new price prior to renewal.

5.6 Free Trials

Where free trials are offered, they begin on the date of subscription initiation. If you do not cancel before the trial period expires, you will be automatically charged the applicable subscription price.

6. Intellectual Property

6.1 Ownership

All Apps, including but not limited to source code, object code, algorithms, machine learning models, design elements, user interface layouts, text, graphics, icons, photographs, trade dress, and trademarks (collectively, "Euler Soft IP"), are owned by or licensed to Euler Soft and are protected by applicable intellectual property laws, including but not limited to copyright law (Berne Convention; Turkish Law No. 5846 on Intellectual and Artistic Works), trademark law, and trade secret law.

6.2 No Transfer of IP

These Terms do not convey to you any ownership interest in Euler Soft IP. The limited license granted in Section 1 does not constitute a sale of any App or any rights therein. Any unauthorized reproduction, distribution, modification, or other exploitation of Euler Soft IP is strictly prohibited and may result in civil and criminal liability.

6.3 Feedback

If you provide any ideas, suggestions, improvements, or other feedback regarding the Apps ("Feedback"), you hereby grant Euler Soft a perpetual, irrevocable, worldwide, royalty-free, fully paid-up license to use, reproduce, modify, adapt, publish, and distribute such Feedback without restriction and without compensation to you.

7. User-Generated Content

7.1 On-Device Content

All data you input into our Apps — including health records, measurements, notes, identifications saved to your library, and schedules — is stored locally on your device. Euler Soft does not have access to, store, or process content you create within the Apps on its own servers.

7.2 Your Responsibility

You are solely responsible for all content you create, input, or otherwise introduce into the Apps. You represent that such content does not: (a) infringe any third-party intellectual property right; (b) violate any applicable law or regulation; or (c) contain any malicious code.

8. Disclaimer of Warranties

8.1 AS-IS Basis

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE APPS AND ALL CONTENT, FEATURES, AND FUNCTIONALITY THEREIN ARE PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. EULER SOFT EXPRESSLY DISCLAIMS ALL WARRANTIES, INCLUDING BUT NOT LIMITED TO: (a) IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT; (b) WARRANTIES ARISING FROM COURSE OF DEALING, COURSE OF PERFORMANCE, OR USAGE OF TRADE; (c) WARRANTIES THAT THE APPS WILL MEET YOUR REQUIREMENTS OR BE UNINTERRUPTED, ERROR-FREE, SECURE, OR FREE OF HARMFUL COMPONENTS; AND (d) WARRANTIES AS TO THE ACCURACY, RELIABILITY, COMPLETENESS, OR TIMELINESS OF ANY CONTENT OR RESULTS GENERATED BY THE APPS, INCLUDING AI-GENERATED OUTPUTS.

8.2 No Warranty on AI Results

Without limiting the foregoing, Euler Soft makes no warranty that AI-generated identifications, value estimates, health trend analyses, or any other App outputs are accurate, current, complete, or suitable for any particular purpose.

9. Limitation of Liability

9.1 Exclusion of Consequential Damages

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL EULER SOFT, ITS OWNER, OFFICERS, EMPLOYEES, AGENTS, LICENSORS, OR SERVICE PROVIDERS BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY: (a) INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES; (b) LOSS OF PROFITS, REVENUE, BUSINESS, DATA, GOODWILL, OR ANTICIPATED SAVINGS; (c) PERSONAL INJURY OR PROPERTY DAMAGE; (d) COST OF SUBSTITUTE GOODS OR SERVICES; OR (e) ANY OTHER INTANGIBLE LOSSES, ARISING OUT OF OR IN CONNECTION WITH YOUR USE OF OR INABILITY TO USE ANY APP, EVEN IF EULER SOFT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

9.2 Aggregate Liability Cap

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, EULER SOFT'S TOTAL AGGREGATE LIABILITY TO YOU FOR ALL CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS OR YOUR USE OF ANY APP, WHETHER IN CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY, OR OTHERWISE, SHALL NOT EXCEED THE GREATER OF: (a) THE TOTAL AMOUNT ACTUALLY PAID BY YOU TO EULER SOFT (VIA THE APPLE APP STORE) FOR THE APP GIVING RISE TO THE CLAIM DURING THE TWELVE (12) MONTHS IMMEDIATELY PRECEDING THE DATE ON WHICH THE CLAIM AROSE; OR (b) TEN UNITED STATES DOLLARS (USD $10.00).

9.3 Essential Basis of the Bargain

THE LIMITATIONS OF LIABILITY IN THIS SECTION 9 APPLY EVEN IF ANY LIMITED REMEDY FAILS OF ITS ESSENTIAL PURPOSE AND REFLECT A FAIR ALLOCATION OF RISK BETWEEN THE PARTIES. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF CERTAIN DAMAGES; IN SUCH JURISDICTIONS, OUR LIABILITY SHALL BE LIMITED TO THE MINIMUM EXTENT PERMITTED BY APPLICABLE LAW.

10. Indemnification

10.1 Your Indemnification Obligation

To the maximum extent permitted by applicable law, you agree to defend, indemnify, and hold harmless Euler Soft and its owner, officers, employees, agents, licensors, and service providers from and against any and all claims, demands, damages, losses, costs, liabilities, and expenses (including reasonable attorneys' fees and legal costs) arising out of or relating to: (a) your use of or access to the Apps or Site; (b) your violation of these Terms; (c) your violation of any applicable law, regulation, or third-party right; (d) your reliance on any App output, including AI-generated identifications, health-tracking data, or value estimates; or (e) any content you submit or input into the Apps.

10.2 Cooperation

Euler Soft reserves the right to assume the exclusive defense and control of any matter subject to indemnification by you, in which case you agree to cooperate with our defense of such claim at your own expense.

11. Dispute Resolution and Arbitration

11.1 Informal Resolution

Before initiating any formal dispute resolution process, you agree to first contact Euler Soft at eulersoft@outlook.com with a written description of the dispute and your desired resolution. The parties agree to engage in good-faith negotiations for a period of thirty (30) days from the date of notice. If the dispute is not resolved within that period, either party may proceed to the dispute resolution process described below.

11.2 Binding Arbitration

Any dispute, controversy, or claim arising out of or relating to these Terms, including their formation, validity, binding effect, interpretation, performance, breach, or termination, as well as non-contractual claims, that cannot be resolved by informal negotiation shall be finally settled by binding arbitration. The arbitration shall be conducted under the rules of the Istanbul Arbitration Centre (ISTAC) or, if unavailable, under the UNCITRAL Arbitration Rules. The seat of arbitration shall be Istanbul, Turkey. The language of the arbitration shall be English. The arbitration award shall be final and binding on both parties.

11.3 No Class Actions

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, YOU AGREE THAT ALL CLAIMS MUST BE BROUGHT ON AN INDIVIDUAL BASIS AND NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY PURPORTED CLASS, COLLECTIVE, CONSOLIDATED, OR REPRESENTATIVE ACTION. THE ARBITRATOR MAY NOT CONSOLIDATE MORE THAN ONE PERSON'S CLAIMS AND MAY NOT PRESIDE OVER ANY FORM OF CLASS PROCEEDING.

11.4 Exceptions to Arbitration

Notwithstanding the foregoing, either party may seek emergency injunctive or other equitable relief in a court of competent jurisdiction to prevent actual or threatened infringement of intellectual property rights or breach of confidentiality obligations, pending final arbitral determination.

11.5 Opt-Out

You may opt out of the arbitration agreement in Sections 11.2 and 11.3 by sending written notice to eulersoft@outlook.com within thirty (30) days of first accepting these Terms. Your notice must include your name, your Apple ID account email address, and a clear statement that you are opting out of arbitration. If you opt out, all disputes shall be resolved exclusively in the courts specified in Section 12.

12. Governing Law and Jurisdiction

12.1 Governing Law

These Terms and any dispute arising out of or in connection with them (including non-contractual disputes) shall be governed by and construed in accordance with the laws of the Republic of Turkey, without regard to its conflict of law principles. The United Nations Convention on Contracts for the International Sale of Goods (CISG) does not apply to these Terms.

12.2 Jurisdiction

For disputes not subject to arbitration or for enforcement of arbitral awards, you irrevocably submit to the exclusive jurisdiction of the courts located in Istanbul, Turkey. If mandatory consumer protection law in your jurisdiction of residence grants you the right to bring proceedings before the courts of that jurisdiction, this Section 12.2 does not affect that right.

13. Third-Party Services and Apple

13.1 Apple as Third-Party Beneficiary

You acknowledge that these Terms are between you and Euler Soft only, and not with Apple Inc. Apple is not responsible for the Apps or their content. To the extent that Apple's standard EULA terms are less restrictive than these Terms, these Terms govern. Apple has no obligation whatsoever to furnish any maintenance or support services with respect to the Apps.

13.2 Third-Party SDK Terms

Your use of third-party services integrated into the Apps (including Google AdMob and RevenueCat) is also subject to those services' own terms and privacy policies. Euler Soft is not responsible for the practices of such third parties.

13.3 App Store Rules

Your use of the Apps is also subject to Apple's App Store Terms and Conditions and Usage Rules. In the event of any conflict between these Terms and Apple's Usage Rules, Apple's Usage Rules shall prevail to the extent of the conflict.

14. Termination

14.1 Termination by Euler Soft

Euler Soft reserves the right to discontinue, modify, suspend, or terminate any App or any portion thereof at any time, with or without notice, for any reason or no reason, including but not limited to App store policy changes, business decisions, or technical requirements. Euler Soft shall not be liable to you or any third party for any such termination or modification.

14.2 Effect of Termination

Upon termination of your license: (a) you must cease all use of the applicable App and delete all copies from your devices; (b) all provisions of these Terms that by their nature should survive termination shall survive, including Sections 2 (Medical Disclaimer), 3 (AI Disclaimer), 4 (Financial Disclaimer), 6 (Intellectual Property), 8 (Disclaimer of Warranties), 9 (Limitation of Liability), 10 (Indemnification), 11 (Dispute Resolution), and 12 (Governing Law).

15. Warranty Disclaimer — Reminder

In the event Apple, Inc. provides a warranty claim mechanism for the Apps, Apple will be solely responsible for addressing any product warranty claim. For warranty claims other than those handled by Apple, please contact us at eulersoft@outlook.com.

16. Severability

If any provision of these Terms is held by a court or arbitrator of competent jurisdiction to be invalid, illegal, or unenforceable for any reason, such provision shall be modified to the minimum extent necessary to make it enforceable, or, if it cannot be so modified, it shall be severed from these Terms, and the remaining provisions of these Terms shall continue in full force and effect. The unenforceability of any provision in a given circumstance shall not affect its enforceability in other circumstances.

17. Force Majeure

Euler Soft shall not be liable for any failure or delay in the performance of its obligations under these Terms to the extent such failure or delay is caused by a Force Majeure Event. "Force Majeure Event" means any event or circumstance beyond Euler Soft's reasonable control, including but not limited to: acts of God; natural disasters; war, terrorism, riot, or civil unrest; pandemic, epidemic, or public health emergency; actions of governmental or regulatory authorities (including decisions by Apple Inc. to remove or restrict Apps); strikes or labor disputes; power failures; internet outages; or failure of third-party service providers (including Apple App Store infrastructure, Google servers, or RevenueCat). Euler Soft will use commercially reasonable efforts to resume performance as soon as reasonably practicable after the Force Majeure Event ceases.

18. Entire Agreement

These Terms, together with our Privacy Policy (available at eulersoft.com/privacy-policy) and any additional terms applicable to specific Apps or promotions, constitute the entire agreement between you and Euler Soft with respect to your use of the Apps and supersede all prior or contemporaneous negotiations, discussions, representations, warranties, and agreements between the parties, whether written or oral, relating to the subject matter hereof.

19. Waiver

No failure or delay by Euler Soft in exercising any right, power, or remedy under these Terms shall operate as a waiver of that right, power, or remedy. No single or partial exercise of any right, power, or remedy shall preclude any other or further exercise of any other right, power, or remedy. All waivers must be in writing to be effective.

20. Changes to These Terms

20.1 Right to Modify

Euler Soft reserves the right to modify these Terms at any time at its sole discretion. Material changes will be communicated by updating the "Last Updated" date at the top of this page and, where feasible, by in-App notification or App Store update release notes.

20.2 Acceptance of Revised Terms

Your continued use of any App after the effective date of any modified Terms constitutes your binding acceptance of the modified Terms. If you do not agree to modified Terms, you must immediately discontinue use of the App and delete it from your devices.

21. Contact Information

For any questions, complaints, or notices regarding these Terms, please contact:

Euler Soft — Legal
Halis Bilal Kara
Republic of Turkey
Email: eulersoft@outlook.com

We will make reasonable efforts to respond to all inquiries within thirty (30) days of receipt.