Terms of Service

Last updated: 12 November 2026

These terms are also available in German.

This English version is a courtesy translation; if it differs from the German version (/agb/), the German version prevails.

1. Who we are and what this covers

Loggerfish is a dive logbook and analytics service offered by Felix Rief, trading as Rief Digital Apps (Einzelunternehmen), Herbert-Weichmann-Straße 8, 22085 Hamburg, Germany, support@loggerfish.com ("we"). These terms apply when you create an account or use the website or apps ("the service"). Our full company details are in the legal notice.

Purchases on our website are sold through Stripe's merchant-of-record service. The merchant of record is Sold through Link, LLC ("Link"), a Stripe company: it charges your payment method, issues your receipt and handles VAT, and your bank or card statement shows the payment as made to "Link.com" with our name. For the payment itself, Link's Sold through Link Terms apply as well. What you get, and how you cancel or withdraw, is set out in these terms: our own ways to cancel and to withdraw in sections 5 and 6 always work, alongside Link's. Purchases inside the iPhone or Android app are sold by Apple or Google instead (section 5).

2. Your account

You must be 16 or older. The Buddy finder (section 8a) is only for people aged 18 or older. Keep your sign-in details safe. One person per account. Tell us if you think someone else has access.

3. Your data

Your log is yours. You grant us only the permission we need to store, process and show it back to you and to run the service (including backups). You can export it at any time and delete your account in the app. Our privacy policy explains how we handle personal data.

4. Not a dive computer or safety tool

Loggerfish records and analyses dives you have already done. Figures such as SAC rate, forecasts or any calculated value are for interest and record-keeping. They are not decompression, gas-planning or safety information.

The planners, such as the decompression planner and gas blending, are planning aids for trained divers, not a dive computer. Verify every plan independently, for example with a second planner, before you dive it. During the dive, follow your training, your dive computer and your agency's rules, never Loggerfish.

With Pro, the tissue replay runs a published decompression model (Bühlmann ZHL-16C with gradient factors) over the depths your dive computer recorded, after the dive. It is a model worked out afterwards from a stored copy of the recording, starting from rested tissues. It is not what your dive computer calculated during the dive and it can differ from it; your dive computer's own log is the record of the dive. The tissue replay never states that a dive was safe or free of risk, and it is not a basis for deciding whether, when or how to dive again, or whether you need medical help. If you have symptoms after a dive, contact a doctor or your diving emergency service, whatever the replay shows.

The Coach shows observations from your own log. It is not medical or training advice; follow your training agency and your dive computer.

5. Free and Pro plans

The Free plan is described on our pricing page, and has no limit on the number of dives. Prices include VAT where it applies:

These are the prices for a purchase on our website. In the iPhone app the App Store shows the price for your storefront; it can differ, and the price Apple shows you before you buy is the one that applies.

There is also a 14-day trial of everything in Pro on signup, which costs nothing, needs no card and ends by itself. Verified dive professionals (divemaster or higher, with active status) get 12 months of Pro free, renewable with a current card.

Subscriptions renew automatically until cancelled. We may change the price for future periods, and will tell you by email at least 30 days beforehand; you can cancel before the new price applies, and a lifetime licence is never affected by a later price change.

• Web subscriptions: cancel any time, either with the cancellation button in your account settings or, without signing in, on our cancellation page at loggerfish.com/cancel — the footer link "Cancel contracts here" ("Verträge hier kündigen") on every page of the site. You keep Pro until the end of the paid period, and we confirm every cancellation by email, with the date your contract ends. A cancellation by email or letter to the address in section 13 is just as valid, and so is cancelling in your Link account at link.com, Stripe's service for buyers.
• Apple and Google purchases: a subscription bought inside the iPhone or Android app is billed through your Apple or Google account, cancelled in that device's own settings, and refunded by Apple or Google, not by us. We are told only that it is active.
• The lifetime licence is a single payment, not a subscription: there is nothing to renew and nothing to cancel.
• The duo plan is paid by one person and covers two accounts. The payer may end the subscription; either account may leave it at any time, and an account that leaves or is removed returns to the Free plan at the end of the paid period. Neither account can see the other's logbook.
• Gift codes add twelve months of Pro to the account that redeems them, on top of any Pro time it already has. A code does not expire. An unredeemed code can be refunded within twelve months of purchase; a redeemed one cannot.
• Referrals. Every account has a referral code. If a new account redeems it within 14 days of signing up and later starts paying, both sides get one month of Pro — as Pro time, or as credit if that side already pays. An account that has already paid cannot redeem a code, and a referring account gets at most twelve free months a year. We may exclude abuse of this rule (for example, self-created accounts) from the reward.
• If we withdraw a Pro feature you were using and do not replace it with something equivalent, you may cancel and we will refund the unused part of the period you have paid for.

6. Right of withdrawal for consumers

You have 14 days to withdraw from a new subscription or a one-off purchase, without giving a reason. The app has a withdrawal button of its own at app.loggerfish.com/#widerruf, separate from cancelling — it takes two steps, and we confirm your withdrawal by email as the law requires.

We refund the whole amount, not a part of it. We do not deduct anything for the days you have already used, and we do not ask you to waive the right of withdrawal in order to start using Pro straight away. This is more than § 357 BGB requires of us, and it is what the app actually does.

If you withdraw during the free trial, nothing has been charged, so there is nothing to refund — your Pro access simply ends and no payment is ever taken.

For purchases made inside the iPhone or Android app, Apple or Google holds the money and only they can give it back; we record your withdrawal, end the Pro access we control, and tell you where to ask.

The statutory instruction below is given in German, which is the language it is binding in.

Widerrufsbelehrung

Widerrufsrecht. Sie haben das Recht, binnen vierzehn Tagen ohne Angabe von Gründen diesen Vertrag zu widerrufen. Die Widerrufsfrist beträgt vierzehn Tage ab dem Tag des Vertragsabschlusses.

Um Ihr Widerrufsrecht auszuüben, müssen Sie uns (Felix Rief, handelnd als Rief Digital Apps, Herbert-Weichmann-Straße 8, 22085 Hamburg, support@loggerfish.com) mittels einer eindeutigen Erklärung (z. B. ein mit der Post versandter Brief oder eine E-Mail) über Ihren Entschluss, diesen Vertrag zu widerrufen, informieren. Am einfachsten benutzen Sie dafür die Widerrufsschaltfläche unter https://app.loggerfish.com/#widerruf; Sie können auch das untenstehende Muster-Widerrufsformular verwenden, das jedoch nicht vorgeschrieben ist.

Zur Wahrung der Widerrufsfrist reicht es aus, dass Sie die Mitteilung über die Ausübung des Widerrufsrechts vor Ablauf der Widerrufsfrist absenden.

Folgen des Widerrufs. Wenn Sie diesen Vertrag widerrufen, haben wir Ihnen alle Zahlungen, die wir von Ihnen erhalten haben, unverzüglich und spätestens binnen vierzehn Tagen ab dem Tag zurückzuzahlen, an dem die Mitteilung über Ihren Widerruf dieses Vertrags bei uns eingegangen ist. Für diese Rückzahlung verwenden wir dasselbe Zahlungsmittel, das Sie bei der ursprünglichen Transaktion eingesetzt haben, es sei denn, mit Ihnen wurde ausdrücklich etwas anderes vereinbart; in keinem Fall werden Ihnen wegen dieser Rückzahlung Entgelte berechnet. Einen Wertersatz für die bereits genutzte Zeit verlangen wir nicht.

Muster-Widerrufsformular

(Wenn Sie den Vertrag widerrufen wollen, dann füllen Sie bitte dieses Formular aus und senden Sie es zurück. Einfacher ist die Widerrufsschaltfläche unter https://app.loggerfish.com/#widerruf.)

An: Felix Rief, handelnd als Rief Digital Apps, Herbert-Weichmann-Straße 8, 22085 Hamburg,
support@loggerfish.com

Hiermit widerrufe(n) ich/wir (*) den von mir/uns (*) abgeschlossenen Vertrag über den Kauf der
folgenden Waren (*)/die Erbringung der folgenden Dienstleistung (*)

Bestellt am (*)/erhalten am (*)
Name des/der Verbraucher(s)
Anschrift des/der Verbraucher(s)
Unterschrift des/der Verbraucher(s) (nur bei Mitteilung auf Papier)
Datum

(*) Unzutreffendes streichen.

7. Acceptable use

Do not attack or overload the service, access other people's data, resell it, or use it to break the law.

8. Reviews you publish

You can rate dive sites and write reviews. These are public: anyone can read them, with the name you choose to show. Your log itself stays private.

• What you may write. Your own experience of the site and the diving there. Do not include links, advertising, other people's personal details, or anything unlawful, abusive or misleading.
• Your rights. You keep the rights to what you write. You allow us to show it in Loggerfish and on our website for as long as it is published, free of charge, and to shorten or translate its presentation (never its meaning).
• Removing it. You can edit or delete your review at any time. Deleting your account deletes all your reviews.
• Reports and moderation. Anyone signed in can report a review. A review reported by three different people is hidden until we have looked at it. We may hide or remove reviews that break these rules, and stop an account from writing reviews if it keeps doing so.
• When we do, we tell you why. You get a statement of reasons naming the rule applied, whether a report or our own check prompted it, and whether it was decided by a person or automatically, as Art. 17 of the EU Digital Services Act requires. You can reply to that message to have the decision looked at again by a person, within six months. This does not affect your right to go to court, or to an out-of-court dispute settlement body certified under Art. 21 of that Regulation.
• No endorsement. Reviews are the opinion of their authors, not ours. They are not a safety assessment of a site: always follow local guidance and your training.

8a. Buddy finder

The Buddy finder helps divers with overlapping trips in the same area find each other. It is free, and off until you list a trip. How we handle your data is in section 3·5 of our privacy policy.

• 18 or older. You confirm this when you make your card. If you are not 18, do not use it.
• Be who your card says. Your card must be true and your own. No harassment, no insults, no pressure to meet or dive. No spam or advertising, and no recruiting for a dive shop or any other business. No minors: do not contact, invite or arrange anything with anyone under 18. If a diver blocks you, leave them alone.
• Contact line. It is shown only after you both say yes. Use it only to arrange diving with that person.
• Reporting. You can report or block any card. Pick a reason; a person at Loggerfish reads every report and we aim to act within 24 hours. A report also blocks that diver for you. We may remove the card or the diver if a report, or our own check, shows these rules were broken.
• Our rights. We may remove a card, or a diver from the Buddy finder, and suspend them, without warning. We tell you afterwards which rule applied, as in section 8. We do not have to watch what divers write, and the text filter on names, regions and contact lines does not catch everything.
• Divers you meet. We do not vet or verify divers or check any ID. Certification, dive count and deepest dive on a card are what the diver entered or what is counted from their own logbook; none of it is checked by us and none of it proves they are safe to dive with. You meet and dive with others at your own risk. Ask to see a certification card, agree a plan, dive within your own training and limits, and tell someone where you are going. Section 4 applies here too.
• Liability. Section 10 applies in full. Nothing in this section limits it further.
• Buddies. After a match you can add each other as buddies. That is never automatic.

9. Availability and changes

We work to keep the service available but do not promise uninterrupted access. We may change features; we will give notice of significant changes that affect what you have paid for.

If we ever have to close the service, we will tell you by email at least three months in advance, stop selling subscriptions and lifetime licences immediately, and keep the export open for 12 months from that notice. Your logbook does not depend on us being here: it is stored on your device as well as in your account, the app keeps working offline, and everything in it can be exported at any time as an Excel file, as UDDF — the format other dive logbooks read — or as a full backup. A lifetime licence bought within the twelve months before such an announcement is refunded in full.

9a. Open-source components

Parts of Loggerfish are open-source software with their own licences, listed under Settings → Help → Open-source components and at loggerfish.com/licences. Where such a licence gives you rights over that component (for example the right to receive its source code, or to modify it), those rights apply to that component, and nothing in these terms, or in Apple's standard end-user licence agreement, takes them away. The rest of Loggerfish stays under these terms.

10. Liability

We are liable without limit for intent, gross negligence, injury to life, body or health, and where the law requires it (including under the Product Liability Act). For slight negligence we are liable only for breach of a material contractual duty — one whose fulfilment makes performing the contract possible at all and on which you may rely — and then only for foreseeable, typical damage. We are not liable for decisions you take based on calculated figures (see section 4).

11. Ending the contract

You can stop using the service or delete your account at any time. Ending a paid subscription is described in section 5; deleting your account also cancels a web subscription. We may end an account for serious breach of these terms, with notice where reasonable.

12. Law and disputes

German law applies, except that mandatory consumer protections of the country you live in remain. We are neither willing nor obliged to take part in dispute resolution proceedings before a consumer arbitration board.

13. Contact

Felix Rief, trading as Rief Digital Apps
Herbert-Weichmann-Straße 8, 22085 Hamburg, Germany
support@loggerfish.com