Privacy Policy

Last Updated: June 24, 2026

Our Privacy-First Commitment

At Tools for Divers, LLC, we believe your dive data is personal and should stay that way. Every app we build follows the same privacy-first philosophy that respects the diving community’s values of safety, professionalism, and personal data sovereignty.

Our Core Promise: Your data stays on your device, under your complete control. When you choose to share your email with us — by subscribing to our newsletter — we store it on our own infrastructure, never sell or rent it, and never use it to profile or track you.

Scope. This Privacy Policy describes how Tools for Divers, LLC handles personal information in connection with our applications and products — Dalton, Slate, and our other dive software — and our opt-in email newsletter. Our marketing website (toolsfordivers.com) uses standard web analytics and advertising-measurement tools, including the Meta Pixel, to understand how visitors find us; that instrumentation is described under “Marketing Website” below and is separate from how our apps and products handle your data.

Dalton — Technical Diving Gas Calculator

Dalton is available on iOS and Android. It performs all gas calculations entirely on your device. Your gas mixes, dive plans, and calculation results are never transmitted anywhere.

Crash reporting only. Dalton sends anonymous crash reports via Sentry to help us fix bugs and improve stability. No dive data, gas mixes, or calculation results are ever included.
Purchase management. Dalton uses RevenueCat to manage the optional Pro in-app purchase. RevenueCat processes transaction data through the App Store (iOS) or Google Play (Android). We do not receive or store your payment details.
No behavioral tracking. No analytics, no telemetry, no advertising identifiers.
No personal data collection. We do not collect your name, email, location, or any personally identifiable information.
No accounts. No sign-in, no registration, no user profiles.
Local storage only. Dalton stores your preferences in a local database on your device (SwiftData on iOS, Room on Android). On iOS, a subset of preferences is mirrored to shared storage for the widget extension. These preferences never leave your device.

Android-Specific Details (Dalton)

Google Play In-App Review. Android Dalton uses Google’s In-App Review API to prompt users for ratings. This communicates with Google Play services. No dive data or personal information is shared.
QR Code Scanning. Android Dalton uses Google ML Kit for on-device barcode scanning (to share calculations between devices via QR code). ML Kit may download a model on first use. No dive data, images, or scan results are transmitted to Google or Tools for Divers.
Android Auto Backup. Android Dalton participates in Android’s system-level Auto Backup, which may back up the local database and preferences to your Google account. This is managed by Android at the OS level and is controlled by your device settings. Tools for Divers does not access this backup data.

Slate — Professional Dive Logbook

Slate stores your dive logbook on your device. No account is required to use the app.

iCloud sync (optional). If enabled, Slate uses iCloud and CloudKit to sync your dive data across your Apple devices. This data is stored in your personal iCloud account, managed by Apple, and is not accessible to Tools for Divers. You can disable sync at any time in Settings.
Bluetooth dive computer import. Slate uses Bluetooth Low Energy (BLE) to communicate with dive computers for wireless dive data import. BLE communication occurs directly between your device and your dive computer. No dive computer data, device identifiers, or download content is transmitted to Tools for Divers or any third party.
Crash reporting only. Like Dalton, Slate sends anonymous crash reports via Sentry. No dive data, logbook entries, or personal information is ever included.
Subscription management. Slate uses RevenueCat to manage the optional Premium purchase. RevenueCat processes transaction data through Apple’s App Store infrastructure. We do not receive or store your payment details.
On-device analysis. Slate’s insights feature uses Apple’s Foundation Models framework. All analysis runs entirely on your device. No dive data is sent to any server for processing.
No behavioral tracking. No analytics, no telemetry, no advertising identifiers.
No accounts. No sign-in, no registration, no user profiles. Your logbook belongs to you.

Slate Link — macOS Dive Computer Companion

Slate Link is a macOS companion app for Slate that downloads dive data from dive computers.

Bluetooth dive computer communication. Slate Link uses Bluetooth Low Energy (BLE) to communicate with dive computers. All communication occurs directly between your Mac and your dive computer. No device identifiers, dive data, or download content is transmitted to Tools for Divers or any third party.
iCloud sync. Slate Link uses iCloud and CloudKit to sync downloaded dive data to your Slate logbook on iPhone. This data is stored in your personal iCloud account and is not accessible to Tools for Divers.
Crash reporting only. Slate Link sends anonymous crash reports via Sentry. No dive data or personal information is included.
No accounts. No sign-in, no registration. Slate Link works entirely through your local device and your iCloud account.

We publish an email newsletter with updates and dispatches from Tools for Divers — new features, dive tools, and what’s new across our apps. Subscribing is entirely optional, and we keep it simple and respectful.

Double opt-in. When you sign up, we email you a confirmation link. You are not added to the list until you click it. If you never confirm, your address is never used.
Stored on our own infrastructure. Your email address (and your name, if you choose to provide one) is stored on servers we operate. We do not hand your list to a third-party marketing platform.
Resend delivers the mail. We use Resend solely as the delivery sub-processor that transmits the emails to your inbox. Resend processes the recipient address to deliver the message; it does not receive your data for its own marketing.
One-click unsubscribe. Every email includes a one-click unsubscribe link, and every subscriber can adjust their email preferences or unsubscribe at any time from the links in any message.
Never sold, rented, or shared. We never sell, rent, or share your email address with advertisers, data brokers, or any third party.
Never used to profile or track you. We do not build advertising profiles, behavioral segments, or cross-site tracking from your subscription.
The apps stay account-free. The in-app “Subscribe” link simply opens the newsletter signup on our website. The apps never see, collect, or transmit your email address — signing up is a separate, deliberate choice you make on the web.

Marketing Website

Our marketing website (toolsfordivers.com) uses:

First-party page analytics — aggregate, cookieless visit counts we record ourselves; no cross-site tracking.
The Meta Pixel (Meta Platforms, Inc.) — to measure advertising performance and understand how people discover Tools for Divers. The pixel may set cookies and share limited browsing events with Meta for ad measurement. You can limit this through your browser settings and your Meta ad preferences at https://www.facebook.com/adpreferences.

This marketing instrumentation applies only to the website. Our apps and products do not embed advertising pixels.

Our first-party page analytics work without identifying you: to count unique visits we derive a one-way hash from your IP address and browser user-agent combined with a secret salt that rotates automatically every day and is never written to disk. The original IP address and user-agent are discarded immediately and never logged or stored.

What We Never Do

No AI Training or Data Mining

Your dive data is NEVER used to train artificial intelligence models
We do not analyze your data for any commercial purpose
No machine learning algorithms access your information
Your data stays yours — period

No Data Selling or Monetization

We never sell, rent, or monetize your personal data, including your email address
Your information is not shared with advertising networks or data brokers
Our business model is transparent: paid apps, not data harvesting
Professional divers can trust that sensitive dive information remains confidential

No Behavioral Analytics or Tracking in Our Apps

We do not track your app usage patterns
No behavioral analysis or pattern recognition
No advertising identifiers or behavioral profiles inside our apps
No advertising pixels are embedded in our apps or products (the Meta Pixel runs on the marketing website only — see “Marketing Website” above)
Crash reports contain only technical stack traces and device model/OS version — never your dive data or usage patterns

No Personal Profiling

We do not create profiles of your diving preferences
No analysis of your equipment choices or dive site preferences
We do not profile or segment newsletter subscribers for advertising
Your diving skill level, certification status, or experience remains private
No sharing with dive industry partners or certification agencies

Your Rights and Control

Complete Data Ownership

You own 100% of your data
Delete any or all data without restriction
No vendor lock-in

Data Deletion

Deleting Dalton removes all locally stored data
Deleting Slate removes all locally stored dive data. If iCloud sync was enabled, your data remains in your iCloud account until you delete it from iCloud settings
Unsubscribing from the newsletter stops all newsletter email; you can also email us to have your subscriber record deleted entirely
Crash reports already sent to Sentry are automatically deleted after 90 days

Third-Party Services

Sentry (Crash Reporting — All Apps)

Purpose: Crash reporting to improve app stability
Data Shared: Crash stack traces, device model, OS version
Not Shared: Gas mixes, calculation results, dive logs, dive plans, or any user-entered data
Privacy Policy: Sentry Privacy Policy
Data Location: United States
Retention: 90 days

Purpose: Delivering the Tools for Divers newsletter and subscription-confirmation emails to subscribers
Data Shared: The recipient email address (and name, if provided), so the message can be delivered
Not Shared: Any dive data, gas mixes, calculation results, or app usage information — and the apps never transmit your email at all
Privacy Policy: Resend Privacy Policy
Note: Resend acts only as our delivery sub-processor; it does not use your address for its own marketing

Meta Pixel (Advertising Measurement — Marketing Website Only)

Purpose: Measuring advertising performance and understanding how visitors discover Tools for Divers on our marketing website (toolsfordivers.com)
Data Shared: Limited browsing events (such as page visits) and, where set, cookies, shared with Meta for ad measurement
Not Shared: Any dive data, gas mixes, calculation results, app usage, or newsletter subscriber data — and the apps and products never load the pixel at all
Privacy Policy: Meta Privacy Policy
Your Controls: Limit this through your browser settings and your Meta ad preferences at facebook.com/adpreferences

RevenueCat (Purchase Management — All Apps)

Purpose: Managing in-app purchases and subscriptions
Data Shared: App Store (iOS) or Google Play (Android) transaction identifiers
Not Shared: Dive data, gas mixes, logbook entries, calculation results, or any personal information
Privacy Policy: RevenueCat Privacy Policy
Note: We do not receive or store your payment information

Google Play In-App Review (Android Dalton Only)

Purpose: Prompting users to rate the app
Data Shared: Minimal interaction with Google Play services
Not Shared: Dive data, gas mixes, calculation results, or any personal information

Google ML Kit (Android Dalton Only)

Purpose: On-device QR code scanning for sharing calculations
Data Shared: ML Kit may download a barcode scanning model on first use
Not Shared: No images, scan results, dive data, or personal information is sent to Google or Tools for Divers

iCloud / CloudKit (Optional Sync — Slate)

Purpose: Syncing dive logbook data across your Apple devices
Data Shared: Your dive log data, stored in your personal iCloud account
Managed By: Apple, under your Apple ID and Apple’s privacy policies
Not Accessible By: Tools for Divers — we cannot read, access, or retrieve your iCloud data
Control: You can disable iCloud sync at any time in Slate’s Settings
Privacy Policy: Apple Privacy Policy

Our marketing website uses first-party page analytics we operate ourselves, plus the Meta Pixel for advertising measurement (see “Marketing Website” above). Our apps use no analytics SDKs, no advertising frameworks, and make no other network calls beyond those listed above within Dalton, Slate, Slate Link, or any other Tools for Divers app.

International Privacy Compliance

Legal Basis: Legitimate interest for app functionality, crash reporting, and aggregate first-party website analytics; consent for the marketing website’s Meta Pixel advertising measurement; consent (your double-opt-in confirmation) for newsletter email
Data Minimization: Apps collect only anonymous crash data; our first-party website analytics store only a daily-rotating one-way hash, never your raw IP or user-agent; the marketing-website Meta Pixel is limited to advertising measurement (see “Marketing Website”); the newsletter stores only the email address (and optional name) you provide
Right to Access: All dive data is on your device; crash data contains no personal information; you may request a copy of your newsletter subscriber record
Right to Deletion: Delete app data by removing the app; unsubscribe and/or email us to delete your subscriber record; crash reports expire after 90 days
Right to Withdraw Consent: Unsubscribe at any time via the one-click link in any newsletter email or your preferences page

CCPA (California)

No Sale of Personal Information: We never sell your data, including your email address
Marketing-Website Advertising Measurement: Our apps, products, and newsletter are never used for cross-context behavioral advertising. On our marketing website only, the Meta Pixel shares limited browsing events with Meta for advertising measurement (see “Marketing Website”); you can limit this through your browser settings and your Meta ad preferences at facebook.com/adpreferences
Right to Know: This policy details all data practices
Right to Delete: Remove the app to delete all local data; unsubscribe and/or email us to delete your subscriber record
Right to Opt-Out: Not applicable to data sales (we do not sell data); you can unsubscribe from the newsletter at any time

Security Measures

Device-Level Security

All data encrypted using Apple’s device encryption
App sandbox security prevents unauthorized access

Network Security

Dalton’s network activity is limited to crash reports (Sentry) and purchase verification (RevenueCat via the App Store or Google Play). On Android, Google Play In-App Review and ML Kit model download are additional minimal network activity.
Slate’s network activity is limited to crash reports (Sentry), subscription verification (RevenueCat via Apple), and optional iCloud sync (Apple CloudKit)
No user data, dive data, or personally identifiable information is transmitted to Tools for Divers servers by the apps; newsletter signup happens only on our website, by your explicit choice

Changes to Privacy Practices

Notification Process

Material changes require app update with clear notification
Privacy policy updates posted at least 30 days before taking effect
Continued app use constitutes acceptance of updated policies
No retroactive changes to data handling without explicit consent

Our Commitment

We will never change our core privacy-first philosophy
Local data storage principle will always remain
Any future features will maintain these privacy standards

Contact Information

Privacy Questions

Email: contact@toolsfordivers.com Include “Privacy” in your subject line. Response Time: Best effort, typically within a few days.

Data Subject Requests

For GDPR or CCPA requests:

Email contact@toolsfordivers.com with “Privacy Rights Request” in the subject
For an app-related request, include your iOS device identifier (found in Settings > General > About); for a newsletter request, include the email address you subscribed with
Specify your request type (access, deletion, portability)
We will respond within 30 days

General Support

Website: toolsfordivers.com

Special Considerations for Professional Divers

Liability and Confidentiality

No dive data sharing with insurance companies or employers
Technical diving information stays under your exclusive control
Military and commercial divers can trust complete data sovereignty

International Travel

All data travels with you on your device
Offline functionality ensures gas calculations and dive logging anywhere
No concerns about dive data crossing international borders on our systems

Summary

Privacy First: Your dive data never leaves your device
Crash Reporting Only: Anonymous crash reports via Sentry — no dive data included
No In-App Tracking: No analytics, no usage tracking, no advertising within our apps
Opt-In Newsletter: Double opt-in, stored on our own infrastructure, delivered by Resend, one-click unsubscribe — never sold, shared, or used to profile you
Apps & Products: No advertising pixels, no analytics SDKs, no behavioral tracking — your dive data never leaves your device
Marketing Website: First-party, cookieless page analytics we run ourselves, plus the Meta Pixel for advertising measurement (marketing site only; the apps never load it)
No Selling Your Data: No advertising networks or data brokers buy or receive your data; we never sell your information
Your Rights: Complete ownership, deletion control, and one-click unsubscribe
Global Compliance: GDPR, CCPA, and international privacy standards

Tools for Divers respects the diving community’s values of professionalism, safety, and personal responsibility. Your trust is earned through transparency, not legal complexity.