Terms of Use
DEFTER PRO TERMS OF USE
Version 2026-10-18 · Last updated: 18 October 2026
Service provider: Arven Soft (Defter Pro)
Sarıyakup Mah. Taberdar Sk. No:5 B Blok Kat:2 D:8, Hektar Plaza Loft Center
Phone: +90 (332) 606 27 78
Contact: bilgi@arvensoft.com
1. Parties and Subject
These terms are between the person or business using the Defter Pro app (mobile and web) ("User") and Arven Soft (Defter Pro) ("Defter Pro"). Creating an account, signing in or continuing to use the app means you accept these terms. The service is for business and professional use; people under 18 may not use it.
2. Scope of the Service
Defter Pro is a cloud-based bookkeeping software (SaaS) offering contacts, invoices, offers, recurring invoices, collections and payments, account and cash tracking, reports, document sharing by PDF and e-mail, and account sharing. Defter Pro does not provide accounting advisory services; documents prepared in the app do not replace official e-documents that must be issued separately under the applicable legislation.
3. Account and Sign-in Methods
You can sign in with e-mail and password or with your Apple or Google account. You can add or remove an Apple/Google connection from the Profile page. You are responsible for keeping your password and connected accounts secure and for telling us if you notice unauthorised use. The information you give at sign-up must be accurate.
4. User Data and Responsibility
You are responsible for the accuracy and lawfulness of the data you enter (customer and supplier details, amounts, documents, etc.). For personal data of third parties that you process in the app, you are the data controller and Defter Pro is the data processor; Defter Pro processes it only to provide the service and on your instructions. Tax, accounting, record-keeping and data-protection obligations remain with the User.
5. Account Sharing
You can share a customer account with another Defter Pro user through an e-mail invitation. Sharing is read-only and covers only the scope you choose (invoices, offers, payments, recurring invoices; optionally IBAN). You can end sharing at any time; the other party can also leave. You are responsible for informing the other party and having the necessary authority before sharing.
6. Notifications and E-mail
Push notifications are optional; they can be switched on or off with the device permission and in Settings > Notifications, and serve transactional purposes such as due-date, collection and sharing reminders. You are responsible for the content of e-mails you send to your customers from the app and for choosing recipients appropriately, and for obtaining any consent required for commercial electronic messages.
7. Acceptable Use
You agree not to use the app for unlawful purposes, nor to harm the system, other users or data, run unauthorised security tests, reverse engineer it or access it through automated bulk means.
8. Pricing
Defter Pro operates under a paid subscription model. Current plans and prices are published at defter.pro. Prices may change with prior notice.
9. Availability and Backups
The service may be temporarily interrupted for maintenance, updates or unexpected circumstances; planned interruptions are announced in advance where possible. We take reasonable security measures to protect your data; you are nevertheless advised to keep your own copies (for example as PDF) of documents you need.
10. Account Deletion and Termination
You can permanently delete your account from Profile > Delete Account (after verifying your identity with your password or a connected Apple/Google account) or at /account-deletion on the web app. Once confirmed, your account, profile, companies and the app data linked to them are permanently removed from the active system and this cannot be undone. Defter Pro may suspend or terminate an account that violates these terms, within the law.
11. Intellectual Property
The software, design, brand and content of the app belong to Defter Pro. The User may not copy, reproduce or distribute them without permission. Ownership of User data remains with the User.
12. Limitation of Liability
Defter Pro is provided "as is". To the extent permitted by law it is not liable for indirect damages, lost profits or consequences of data entered incorrectly by the User. The User is responsible for working with a qualified accountant for tax and accounting obligations.
13. Changes
These terms may be updated. For material changes we will notify you in the app and, where needed, ask for your acceptance again.
14. Governing Law and Jurisdiction
This agreement is governed by Turkish law. The courts and enforcement offices of Konya are competent; statutory jurisdiction rules under consumer legislation are reserved.
15. Contact
Questions: bilgi@arvensoft.com
Privacy Policy and Data Protection Notice
DEFTER PRO PRIVACY POLICY AND DATA PROTECTION NOTICE (KVKK)
Version 2026-10-26 · Last updated: 26 October 2026
This notice is prepared under Article 10 of the Turkish Personal Data Protection Law (KVKK, Law no. 6698).
1. Data Controller and Our Roles
Data controller: Arven Soft (Defter Pro)
Sarıyakup Mah. Taberdar Sk. No:5 B Blok Kat:2 D:8, Hektar Plaza Loft Center
Phone: +90 (332) 606 27 78
Contact: bilgi@arvensoft.com
We are the data controller for your account, authentication, notification and usage data. For the customer, supplier, invoice and similar business records you enter in the app, you are the controller and we are the processor; we process them only to provide the service.
2. Personal Data We Process
- Account and identity: first and last name, e-mail, phone (optional), profile photo (optional). Your password is stored one-way encrypted and cannot be read by us.
- Sign in with Apple or Google: the name, e-mail address (a relay address if you choose Apple "Hide My Email") and provider ID the provider shares. We do not receive your password from these providers.
- Company and business records: company details, contacts, invoices, offers, payments, account and cash movements, recurring items, e-mail sending logs.
- Account sharing: the e-mail address you invite, the sharing scope and related notifications.
- Notification data: push notification token, device platform, app language, time zone and device name.
- Technical error logs: when the app hits an unexpected error, the error type, technical stack trace and device platform are stored with your account in our own infrastructure (Supabase). We do not intentionally include invoices, amounts or contacts. The app uses no third-party analytics or advertising tools.
- Security: session information and request logs kept by the infrastructure provider (including IP address).
- Biometric data: the app lock uses your device's Face ID or fingerprint check. Your biometric data never leaves your device; it is not sent to or stored by Defter Pro.
3. Purposes and Legal Bases
- Creating your account, authentication, providing the service, sharing and notifications: performance of a contract (KVKK Art. 5/2-c).
- Security and essential service logs: applicable legitimate interest or legal obligation (KVKK Art. 5/2-f, 5/2-ç). Technical error logs are processed on this basis to keep the service secure and working.
- Compliance with legal obligations: legal obligation (Art. 5/2-ç).
- Push notifications and commercial electronic messages: explicit consent; push permission can be withdrawn in your device settings or in Settings > Notifications, announcement and offer notifications in Settings > Notifications, and commercial e-mail consent by writing to us. Announcement and offer notifications are sent only if you switch them on. Notifications never contain amounts, document numbers or message text; you see the details in the app.
- Measuring and improving how our website (defter.pro) is used: only with your explicit consent (KVKK Art. 5/1).
4. Transfers
Your data is shared with service providers only as needed to run the service: Supabase (hosting, database, authentication and file storage), Expo (push delivery and app updates) and the Apple/Google notification infrastructures, Apple and Google only if you sign in with them, the e-mail server you configure for sending e-mail, and Google (only on our website and only with your consent: website usage statistics via Google Analytics). Some of these providers are located abroad; transfers are made with the safeguards required by KVKK Art. 9. Only the records within the scope you choose are shared with a person you share an account with. Lawful requests from competent authorities are reserved. Your data is not sold or used for advertising.
5. Retention
Your data is kept while your account is active. Records you delete stay in the trash for 30 days and are then permanently deleted. When you delete your account, your account, profile, companies and linked records are permanently removed from the active system, and the account shares you own are deleted too. If you signed in with Apple, deletion is confirmed with Apple and the linked Apple authorization is revoked; contact support if the revocation cannot be completed. Infrastructure providers' backups follow their own limited retention cycles and are not used for product access. Retention and disclosure obligations under tax and accounting legislation remain with the User; we recommend downloading the documents you need as PDF before deleting.
6. Your Rights (KVKK Article 11)
- Learn whether your personal data is processed and request information
- Learn the purpose of processing and whether it is used accordingly
- Know the third parties to whom it is transferred in Turkey or abroad
- Request correction if incomplete or inaccurate
- Request deletion or destruction and notification of this to third parties it was transferred to
- Object to an outcome against you resulting from automated analysis
- Claim compensation if you suffer damage from unlawful processing
Send your requests to bilgi@arvensoft.com; we reply within 30 days at the latest. You may also complain to the Personal Data Protection Board.
7. Security
Data is transmitted over encrypted connections; each user's data is accessible only to that user (and to people within a sharing scope). No system is entirely risk-free; in case of a breach we fulfil the notification duties in the legislation.
8. Children
Defter Pro is a business service and is not directed at people under 18.
9. Cookies and Local Storage
The web and mobile apps use local storage needed for your session and preferences (language, theme, app lock). The apps do not use third-party advertising or analytics cookies.
On our website (defter.pro), Google Analytics cookies are used only with your consent, to understand how the site is used. Through these cookies, Google processes usage data such as the pages you visit, approximate location (country and city), device and browser information, and the site that referred you. Google Analytics cookies are kept for up to 2 years. If you do not consent, no analytics cookies are set; only cookieless measurement signals that do not identify you may be sent to Google. You can change or withdraw your consent at any time via the “Cookie preferences” link at the bottom of the website. No advertising cookies or trackers are used.
10. Changes
This notice may be updated; material changes are announced in the app.