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On 12 October 2026 we loaded dcabtc.com in an ordinary browser. The page and its inputs worked normally. On the default scenario ($10 weekly for 3 years), "Total Invested" correctly showed $1,570 — but "Total Value" rendered as "$NaN" with "NaN Satoshis", and "Percent Change" showed "NaN.undefined%". The prefilled tweet read "…would have turned $1,570 into $NaN (-NaN%)".

That pattern — invested amount fine, value broken — is not a price feed that has gone down. dcaBTC makes no price request while you use it: its Bitcoin history is a fixed table inside the page's own code. On 12 October 2026 that table ran from 17 July 2010 to 3 May 2025 and had no prices for 12 September to 12 October 2024. Every plan we tried with a purchase inside that month showed $NaN: the default scenario, our five-year test, and a six-month plan from June 2024 that ends well before the table does.

Plans that avoid the gap do show numbers. $10 a week for two years from 12 October 2021 showed $1,050 invested and $1,062 of value, up 1.22%. But every day after 3 May 2025 is priced at the 3 May 2025 value, so a plan that starts later than that shows a value equal to the amount invested and a 0.00% change, whatever Bitcoin actually did. The preset for one year, starting one year ago, did exactly that.

So this is not an outage that clears on its own: the gap and the cut-off stay until dcaBTC ships a new table. Which plans hit the gap does change with the date, because "starting 3 years ago" moves forward every day. We date every observation for exactly that reason. If dcaBTC is working when you visit it, tell us and we'll update this page — confirmed corrections jump the queue under our corrections policy.

Its interface is one of the cleanest in the niche: a handful of controls, no clutter, and defaults phrased the way people actually think ("$10 weekly for 3 years"). Its long-form explanations of what DCA is and why it suits volatile assets are better written than most, and its one-click direct link carries your exact settings, which makes comparing scenarios with someone else easy.

If all you want is a quick "what would $X a week have done" for a window its price table covers, dcaBTC puts an answer on one screen. The comparison below is for people who want that answer for any dates up to today, plus the parts it leaves out: fees, risk metrics, more benchmarks, and a way to check the math.

We loaded dcabtc.com in an ordinary browser on 12 October 2026, ran its default scenario and more than twenty other plans with different start dates, lengths and frequencies, inspected each control, and recorded exactly what rendered. We also read the price table in the page's own JavaScript, which is how we know where it starts, where it stops and where the gap is. Our standard cross-tool test — $50 a week for five years — showed $NaN, so there were no numbers to compare, and this page compares features and observed behavior only.

We are not neutral; this is our calculator. That's why every claim is dated, every "not found" is labeled as such rather than as fact, and errors reported via the contact page get corrected with priority.