Contact
This site is built and maintained by one person, drix. There's no support desk and no ticket queue. Just two channels that reach me directly.
Two Ways to Reach Me
X (Twitter) — direct
Best for anything you'd rather not post in public: privacy and data requests, security disclosures, or a quick question. Mentions and direct messages both reach me.
@9drix9GitHub issues — public
Best for wrong numbers, bugs, and feature requests. Issues are public, which is the point. The report, the discussion, and the eventual fix stay linked together where anyone can check them.
Open an issueThis site deliberately has no contact form and lists no email address. A form would mean collecting and storing your details on a server, and this site doesn't run one for user data. See the privacy policy.
What to Expect
- Typical reply: within a few days. This is a project maintained outside of a full-time job, so it is not instant and there is no guaranteed response time.
- If a week passes, ping again. Messages do get missed. A follow-up is welcome, not annoying.
- Confirmed calculation errors jump the queue. A number that is wrong on a financial page gets fixed before anything cosmetic, and the fix is recorded per the corrections policy.
- Not everything gets built. Feature requests are read and appreciated, but the honest answer is often "maybe, eventually". Or you can send a pull request, since the code is MIT licensed.
Reporting a Wrong Number
This is the most useful thing you can send me. To reproduce a result I need the exact inputs, so please include:
- The page or tool (for example the main calculator, a
/dca/scenario page, or a specific widget). - Investment amount, frequency, start date, end date, and fee percentage.
- The price source you had selected, and the display currency.
- What the site showed, and what you expected instead, ideally with the source you checked against.
- A screenshot, or the calculator URL, which encodes your settings in its query string.
Before reporting, it's worth checking the methodology page. Several common surprises there are documented and intentional. The Kraken series is weekly closes, with the days in between filled in along a straight line (the default Coinbase series has a close for every day). Purchases are bucketed on UTC calendar days. Non-USD currencies convert at today's rate rather than historical ones. Taxes and spreads are not modeled at all.
Privacy & Data Requests
If you want to ask what data this site holds about you, or ask for something to be deleted, message @9drix9 on X. Use a direct message rather than a public GitHub issue so you aren't publishing your own details.
The likely answer, in advance
There are no user accounts, no email list, and no server-side database of user data. The calculator does its arithmetic in your browser and keeps your settings in the page address. That address does reach my host, Vercel, with the page's requests, and Vercel's request logs keep addresses for a limited time (one hour to 30 days by its documentation, depending on the plan). Nothing in my code stores them. Preferences such as theme and currency live in your browser's localStorage. So do Cost Basis Tracker positions, which are never sent to my server. So there is usually nothing on my side to export or erase. You can remove what the site has stored on your device by clearing site data for this domain in your browser settings.
Vercel Web Analytics and Speed Insights run without cookies, and calculator settings are cut out of the page address before they send it. Vercel counts visitors with a hash of each request that it says it discards after 24 hours, and its documentation says the figures a site owner gets are aggregated. So I have no way to pull out one visitor's records on request.
One more thing loads, but only with your permission. If you press Accept All in the cookie banner, Google's ads tag runs so I can measure whether my own Google ads bring anyone here. It sets cookies on this site, sends Google the address of the pages you view, and lets Google use the visit for ad personalisation. Choose "Essential Only" and it never loads at all. The Cookie preferences link in the footer withdraws consent and deletes the cookies the tag set on this site. What Google holds on its own side is outside my reach, so that request has to go to Google. Display ads come from A-ADS in frames that load whatever you answer. The privacy policy says what those frames load.
The privacy policy spells all of this out. If you think something there is inaccurate, tell me and I'll correct it.
Parents and guardians
This site is not directed at children under 13 and does not knowingly collect personal information from them. If you are a parent or guardian and believe your child has provided personal information through this site, message @9drix9. I will look into it and delete anything found.
Security Disclosures
Found a vulnerability? Please send it privately by direct message on X first, rather than opening a public issue. Give me a reasonable window to ship a fix. The site holds no user accounts or funds, but I'd still rather not have a live problem discussed in public before it's patched. Credit in the changelog if you want it.
What I Can't Help With
Saying this plainly saves us both time:
- Personal financial advice. I can't tell you whether to buy Bitcoin, how much, or when. I'm not a licensed adviser and I don't know your circumstances.
- Tax questions. The calculator models no taxes at all, on purpose. Cost-basis rules (what counts as the price you originally paid) differ by country. Ask an accountant in yours.
- Exchange or wallet support. This site is not an exchange, a broker, or a custodian. It never holds your keys or your coins. So it cannot recover an account, reverse a transaction, or restore a lost seed phrase.
- Anyone claiming to be me offering recovery. I will never message you first asking for a seed phrase, a private key, a payment, or remote access to your device. Anyone doing that is a scammer, no matter whose name or photo they use.
- Paid placements. Guest posts, sponsored links, and "partnership" pitches are declined without reply. The paid placements this site already carries are labelled where they appear and listed in the ads & disclosure section.
Related pages
Run your own numbers
If you came here to check whether a result was right, the fastest path is to rerun it yourself with the settings spelled out.
Open the calculatorNot financial advice. Correspondence through the channels above is informational and educational only, and does not create an advisory relationship of any kind. Bitcoin is volatile and you can lose money. Do your own research.