twofair
English version (non-binding translation)
Provider: Zealos Energy GmbH, Zur Mühle 20, 01983 Großräschen OT Dörrwalde, Germany
App: app.twofair.com · Status / Version: V1.0 July 2026
Note on this document
This is the English translation of the Terms. The German version is the legally authoritative one (see § 16).
§ 1 Scope, Provider and Definitions
(1) These General Terms and Conditions and Terms of Use (“Terms”) govern the use of the web application twofair (the “App”), provided at app.twofair.com, together with all related free and paid services.
(2) The provider and contracting party is Zealos Energy GmbH Zur Mühle 20 01983 Großräschen OT Dörrwalde Germany
Represented by the managing director: Georgios Bakouros
Register court: HRB 8162 CB
VAT ID: DE 262710012
(the “Provider”).
(3) The App is intended exclusively for consumers within the meaning of Section 13 of the German Civil Code (BGB). Use for commercial or self-employed professional purposes is not the subject of these Terms.
(4) To conclude a paid subscription, the user must have full legal capacity. The App is not intended for use by children; children whose costs are recorded are not users of the App.
(5) Deviating or supplementary terms of the user do not become part of the contract unless the Provider expressly agrees to their validity.
(6) Conclusion of a paid subscription to twofair Plus is limited to consumers resident in the European Union, the European Economic Area, or Switzerland. The free tier twofair Start may be used independently of this, provided no payment obligation arises.
Definitions:
- “Family” means the shared workspace in which expenses, payments and the balance are maintained.
- “Entry” means any record created by a user – an expense or a settlement payment – including soft-deleted records.
- “twofair Start” means the permanently free usage tier with a volume limit (§ 3).
- “twofair Plus” means the paid usage tier (§ 4).
- “Co mode” means the shared use of a Family by two users.
§ 2 Subject Matter and Description of Services
(1) The App is a tool for the transparent, fair allocation of child-related costs between the users. It records expenses, calculates shares according to a split ratio chosen by the users themselves, and displays a running balance (who owes whom). It maintains a shared transaction feed, a tamper-evident history and export functions (CSV/PDF).
(2) Scope of services
- The App is not tax, accounting or receipt-archiving software. It does not fulfil any statutory retention obligations. Uploading receipts is voluntary and serves solely to provide traceability between the users, not legally compliant archiving.
- The App does not provide legal advice, mediation or conciliation. It makes no statement as to which split ratio is legally “correct” or “fair” and does not replace any agreement on maintenance or child-related costs.
- The App is not a payment service. It does not process payments between the users. Settlement payments are merely documented; the actual flow of money takes place outside the App. The Provider is not a payment institution.
- The displayed balance is a calculation aid based on the data entered by users and is not a legally binding determination of a claim between the users.
§ 3 twofair Start (permanently free)
(1) twofair Start is a permanently free usage tier with no expiry date. It is not a time-limited trial period.
(2) twofair Start is limited to 10 entries (expenses and payments combined, including soft-deleted records). Once this limit is reached, the user is prompted to upgrade to twofair Plus.
(3) In twofair Start the App is used individually (solo mode); inviting a second user (Co mode) is reserved for twofair Plus.
§ 4 twofair Plus, Prices and Payment
(1) twofair Plus is subject to a charge. The applicable prices and any promotional offers are set out in the price overview displayed in the App at the time of ordering. The decisive figure is the total price including statutory VAT shown during the order process.
(2) twofair Plus in particular unlocks: unlimited entries beyond the limit of 10, Co mode (inviting a second user), and the full feature scope of the App (premium features).
(3) Payment is processed via an external payment service provider. Payment and card data are processed exclusively by that provider and are not stored by the Provider. Invoicing is carried out via the payment service provider. Details are set out in the privacy policy.
(4) Before concluding the paid subscription, the essential contract information, in particular total price, term and renewal, is displayed to the user clearly and comprehensibly. The order button is labelled in accordance with Section 312j(3) BGB with an unambiguous indication of the payment obligation ([finalise § 312j-compliant button label, e.g. “order with obligation to pay”]).
§ 5 Conclusion of Contract and Co-Parenting Constellation
(1) The usage contract for twofair Start is concluded upon registration (email and password) and acceptance of these Terms and the privacy policy during onboarding.
(2) The contract for twofair Plus is concluded upon completion of the paid order process (§ 4).
(3) In Co mode, the paying user may invite a second user via an invitation link. The invited user registers with their own account (own email and password) and thereby also accepts these Terms and the privacy policy.
(4) The contracting party for the paid Plus subscription and solely liable for payment is the paying (inviting) user. The invited user is a co-user of the shared Family; no payment obligation under the Plus subscription applies to them. The subscription is assigned to the Family, the payment obligation to the paying user.
§ 6 Right of Withdrawal
(1) Consumers have a statutory 14-day right of withdrawal for paid subscriptions.
(2) The twofair Plus features are available immediately after payment. The user may request that performance begin before the withdrawal period expires; to this end, at checkout the user expressly confirms that performance of the digital service shall begin before the end of the withdrawal period. The right of withdrawal remains unaffected.
(3) During the withdrawal period, the user may declare the withdrawal at any time via the easily accessible, clearly labelled electronic withdrawal function (Section 356a BGB) provided in the App. The Provider confirms receipt of the withdrawal without undue delay in text form.
(4) In the event of an effective withdrawal, the Provider refunds the payment made. If the user requested early commencement of performance under paragraph 2, they owe compensation for value for the service already provided up to the withdrawal; this compensation is calculated on a pro-rata basis by reference to the time elapsed up to the withdrawal relative to the total term, and is set off against the refund amount.
(5) A withdrawal already declared is retained as evidence even if the user deletes their account; the information required for that evidence is stored independently and merely detached from the user’s identity (anonymised). Details are governed by § 8(3) and the privacy policy.
§ 7 Term, Automatic Renewal and Termination
(1) The Plus subscription has an initial term of 12 months.
(2) After the initial term, the subscription automatically renews for an indefinite period. The user may terminate the subscription, once renewed for an indefinite period, at any time with one month’s notice. Termination as of the end of the initial term is likewise possible with a notice period of no more than one month.
(3) Termination is possible at any time via the easily accessible, clearly labelled cancellation button in the App. The user receives confirmation of the termination in text form.
(4) During the initial term, remuneration already paid is not refunded on a pro-rata basis upon termination; access to twofair Plus is retained until the end of the initial term. If the subscription renews for an indefinite period after the initial term and an annual amount continues to be charged in advance for the renewal, then upon termination during that renewal period the remuneration attributable to the full months not yet used is refunded on a pro-rata basis.
(5) If the paying user terminates or deletes their account during a current paid subscription, the subscription ends not immediately, but at the end of the period already paid for. The remaining user of the Family is not subsequently charged and incurs no new payment obligation from the ended subscription.
§ 8 Data after Termination; Shared Family Data
(1) After the end of the paid term, access to the Family’s data is retained for 90 days in read-only mode.
(2) After these 90 days, the data are deleted in compliance with data protection law. Details of the processing and deletion of personal data are set out in the privacy policy.
(3) The financial data maintained jointly within a Family (expenses, payments, receipts, split ratios, and the log) are treated as shared data of both users of the Family – comparable to a jointly kept household ledger. They therefore cannot be completely removed unilaterally by a single user, because the other user has a legitimate interest in a complete, unaltered shared history.
(4) If a user deletes their account while part of a shared Family, their profile and access credentials are completely removed. The shared entries they created (expenses, payments, receipts, log) remain unchanged in content for the other user, but no longer appear under the deleting user’s name; instead, they are anonymised as “Former member”. This is a deliberate service characteristic to protect the shared history and is not a defect. The data-protection classification (in particular the legal basis and the exception from the erasure obligation) is governed by the privacy policy, section 6.1.
§ 9 User Obligations and Responsibility
(1) The user is responsible for the accuracy, completeness and lawfulness of the data they enter. The App calculates solely on the basis of the values entered.
(2) The user must keep their access credentials confidential and protect them from third-party access. The user is responsible for all activity under their account and must inform the Provider without undue delay upon becoming aware of any misuse.
(3) Free-text fields (e.g. expense description, info bank) may be filled in freely. The App is not intended for the storage of special categories of personal data within the meaning of Article 9 GDPR (in particular health data). The user decides at their own responsibility what data to enter and refrains from entering such sensitive data.
§ 10 Acceptable Use
The user undertakes in particular:
- to use the App only for its intended purpose (allocation of child-related costs within their own family context);
- not to post unlawful content and not to infringe the rights of third parties;
- not to misuse the free-text fields and upload functions;
- not to use the App in an automated manner beyond ordinary manual use, and not to reverse engineer, decompile, or circumvent technical protection measures, except where mandatorily permitted by law.
§ 11 Neutrality of the Provider
The Provider is neutral and does not act as arbitrator or conciliator between the users. The App solely documents the data entered by users and makes no decision on its substantive accuracy.
§ 12 Availability; Third-Party Providers
(1) The Provider endeavours to keep the App available in accordance with the state of the art but does not owe any specific, uninterrupted availability. Maintenance work, disruptions outside the Provider’s control, and events of force majeure may temporarily limit availability.
(2) The App uses third-party services (in particular for hosting, payment processing, and anonymous analytics) whose failure or change may affect the availability of the App. The specific service providers and the data protection details are set out in the privacy policy.
§ 13 Liability
(1) The Provider is liable without limitation for damage arising from injury to life, body, or health based on a breach of duty by the Provider, and for other damage based on intent or gross negligence of the Provider.
(2) In the case of slight negligence, the Provider is liable only for breach of a material contractual obligation (cardinal obligation), the fulfilment of which is essential to the proper performance of the contract and on whose observance the user may regularly rely. In such case, liability is limited to the foreseeable damage typical for the contract.
(3) Liability under the Product Liability Act and under any guarantee assumed by the Provider remains unaffected.
(4) The Provider is not liable for the accuracy of the data entered by users and the results calculated therefrom (in particular the balance), nor for consequences arising from the user entering sensitive data contrary to § 9(3).
§ 14 Suspension and Termination by the Provider
(1) The Provider may suspend an account or terminate the contract in the event of a serious or repeated breach of these Terms. Prior to suspension or termination, the Provider will, as a rule, issue a warning and give the user an opportunity to remedy the breach, where reasonable and necessary in the circumstances; the principle of proportionality applies.
(2) The right to extraordinary termination for good cause remains unaffected for both parties.
§ 15 Changes to the Terms and Prices
(1) The Provider may amend these Terms where required for a valid reason (e.g. changes in the law, supreme court case law, technical conditions, or the service offering) and where the user is not thereby unreasonably disadvantaged contrary to good faith. Amendments are communicated to the user in text form at least four weeks before they take effect.
(2) If the user does not consent to the amendments, the Provider is entitled to terminate the contract by ordinary notice as of the date the amendment takes effect. The Provider specifically informs the user of the consent requirement and the consequences of non-consent in the amendment notice.
(3) For current billing periods, existing prices are guaranteed; price changes take effect at the earliest as of the next renewal and are announced in good time beforehand.
§ 16 Languages and Authoritative Version
(1) These Terms are provided in German and English. Further language versions may be added.
(2) Only the German version is legally authoritative. Translations serve solely to aid understanding. In the event of contradictions or questions of interpretation between the language versions, the German version prevails.
§ 17 Applicable Law, Consumer Dispute Resolution, Final Provisions
(1) The law of the Federal Republic of Germany applies, to the exclusion of the UN Convention on Contracts for the International Sale of Goods. For consumers habitually resident in another EU member state, the mandatory consumer protection provisions of the state of residence remain unaffected (Article 6 Rome I Regulation).
(2) The Provider is not obliged and not willing to participate in dispute resolution proceedings before a consumer arbitration board (Section 36 VSBG).
(3) Should individual provisions of these Terms be or become invalid or unenforceable, the validity of the remaining provisions remains unaffected. The invalid or unenforceable provision is replaced by the statutory rule.
(4) The statutory consumer place of jurisdiction applies; no deviating jurisdiction agreement is made vis-à-vis consumers.