Privacy Policy

Effective November 8, 2026 · START NODE S.A.

coinfinance is a market dashboard operated by START NODE S.A. (“we”). This policy covers the website coinfinance.com and the CoinFinance app for iOS. We collect as little as we can: you can use the board without an account, we do not sell personal data, and we do not use third-party advertising or analytics trackers.

Using coinfinance without an account

Your board (widgets, groups, sizes, notes) is saved on your device only: in your browser’s local storage on the web, and in the app’s on-device storage on iOS. We do not receive it unless you sign in on the web.
To show prices, charts, news and widget content, your browser or the app sends us the market symbols on screen and the size of each widget. These requests are not tied to an identity.
The CoinFinance iOS app has no sign-in: it only talks to coinfinance.com and keeps your board and theme on the device.

If you create an account (web)

You can sign in with Google, with Apple or with an emailed sign-in link. We store your name, email address and profile picture URL as provided by that service, plus the provider’s account identifier and sign-in tokens needed to keep you signed in.
For each session we store a session token, its expiry, and the IP address and browser user agent of the device that signed in (used for security).
Data you create while signed in: your saved boards, presets you publish to the public library (title, description, tags and content, shown with your name), your votes on presets, and premium requests and premium status.
To count how often a preset is added we keep a short-lived record keyed by your account or by a keyed hash of your IP address (never the raw IP); these records are deleted after a few days.

Advertising inquiries

If you use the “Advertise” form we store what you enter (name, email, company, website, preferred start month, payment currency and message) and a keyed hash of your IP address used only to limit abuse. We use it to answer you and to manage the campaign.
Ad spots on the board are sold directly by us. We count impressions and clicks per spot and day ourselves, without identifiers, cookies or third-party ad networks. Premium members see no ads.

Cookies and local storage

We set one essential cookie when you sign in: the session cookie that keeps you signed in. We do not use advertising, analytics or cross-site tracking cookies.
Local storage holds your board and a few preferences on your device; session storage remembers which ad tiles were already counted in the current tab. You can clear both from your browser at any time.

Service providers

Hosting and database providers that run coinfinance.com on our behalf.
OpenAI, when AI features are enabled: to choose widget content and to answer widget requests we send the symbols, prices, market signals, news headlines, group notes and the text you type into a widget’s AI box. We do not send your name, email or IP address.
Mailgun (and Resend as a fallback) to deliver emailed sign-in links to your address, and to notify our team about advertising inquiries and premium requests.
Google and Apple, only if you choose to sign in with them; their own privacy policies apply to that step.
Market data providers (such as Coinbase, Binance, Twelve Data, Yahoo Finance, CoinGecko and exchange-rate services). Our servers request market data by symbol; no personal data is sent to them, and your device never contacts them directly.

Logs and security

Our servers keep operational logs (errors, timings, rate-limit decisions) to keep the service running and to prevent abuse. We do not log email addresses or message contents in them.
Request rate limits use your IP address in memory only, for a short time.

Retention and your choices

Boards stored on your device stay there until you remove them, clear your browser storage or delete the app.
Account data is kept while your account exists. You can ask us to access, correct, export or delete your account and everything linked to it (sessions, boards, presets, votes, premium records) by writing to us; deletion removes them from our database.
Advertising inquiries are kept as long as needed to handle the request and the resulting campaign and its accounting.

Children

coinfinance is not directed at children under 16 and we do not knowingly collect their personal data.

Changes

We will update this page when our practices change and show the new effective date at the top.