A yes–no oracle can be built as a small browser-side toy with vanilla HTML, CSS, and JavaScript: it turns a typed question and the moment you click into a YES or NO, then keeps a short history in the browser. But “100% private” is stronger than the available evidence supports. BenDen’s April 2, 2026 HackerNoon article describes the design, yet its sample also loads Tailwind from a CDN, which ordinarily requires an external network request. The code is a playful response generator—not a reliable way to make important decisions.
What the oracle does
BenDen’s April 2, 2026 HackerNoon article describes a browser-based yes–no oracle made with vanilla HTML, CSS, and JavaScript. A user enters a question such as “Will I get that promotion?” or “Should I order sushi or pizza?” The page returns YES or NO and adds the consultation to a recent-history list.
The intended appeal is simplicity: the described response logic runs in the page rather than relying on a server-side decision service, and the sample keeps its history in browser localStorage. That is a description of the implementation in the article, not an independent audit of a live deployment or proof about every way the page or its dependencies handle data.
How the answer is generated
- Normalize the input. The sample trims whitespace from the question and converts it to lowercase.
- Build a simple hash. It processes the question’s characters with a basic integer-hash routine.
- Mix in click timing. It adds
performance.now(), then uses a sine-based function to produce a pseudo-random-looking value. - Choose a response. Values above 0.5 yield YES; other values yield NO.
Because the timing is part of the input to the calculation, asking the same wording again does not necessarily produce the same response. The author describes both wording and timing as affecting repeat questions. This custom construction is a toy mechanism, not a prediction engine, a cryptographic random-number generator, or a measure of what answer is best.
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- Do you have choice difficulties? Don¡¯t know what to do? Throw a coin and let it decide!
- Let your spirit guides help you to make that decision with this easy-to-use divination tool. This is a Yes Or No coin which is also sometimes called a Prediction Coin. The coin is easy to use. Ask a question and toss the coin for your answer.
- Coins are two-sided and fully embossed with detailed imaging. The diameter of the coin is 40 mm (~1.6 inches) and with a thickness of 3 mm (~0.12 inches). Made of high-quality copper material, wear-resistant and durable, can be stored and used for a long time. The coin is very small and easy to store, you can take it with you.
- It's a quirky item and an excellent gift idea - perfect for anyone with an interest in coin collecting or who needs to be better at decision-making.
- Every item is designed with Mother Earth in mind by using materials that can be easily recycled. We treat each and every order with thought and care.
What “private” means here—and what it does not establish
The article’s sample prepends each question, answer, and locally formatted time to a history stored in localStorage, then limits the list to the latest 15 entries. This design keeps that history in the browser’s local storage rather than describing a remote history service. It does not, by itself, prove the privacy characteristics of a deployed page or of any third-party code loaded alongside it.
There is a specific mismatch in the article’s evidence: its sample HTML loads Tailwind using https://cdn.tailwindcss.com. In an ordinary browser load, fetching that external script entails a network request to the CDN. So the sample and the literal claim of “zero network requests” do not align unless the dependency is removed, self-hosted, or not present in the deployed implementation. The live deployment was not audited, so it is not established that it makes zero requests.
Rank #2
- Diameter: 1.57" (40mm); Depth: .12" (3mm), each coin comes with an acrylic protective case
- It is full of commemorative meaning and an awesome gift for those who are fond of collecting coins.
- These coins are extremely high-quality with a nice design: mysterious Mayan totem at the bottom, and unique relief letter "YES" on one side and "NO" on the other
- Having trouble making life's tough decisions and don't know what the to do? Flip away the pressure of setting any decision with our Yes/No coin. For the troublesome issues, let God choose.
A page can avoid sending the question to a backend and still contact an external service to fetch a script or other asset. To make a no-external-request claim about a particular copy, inspect its actual deployed resources and browser network activity; the article’s example alone is not enough to establish that claim.
Is this cryptographically random?
No. The described code uses a question hash, click timing, and a sine-based function; it does not use Web Crypto. Those ingredients are enough for a lighthearted binary toy, but they should not be described as cryptographically secure or as providing a dependable random process.
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Rank #3
- Bulk Quantity: there are 20 pieces of yes no coins, with the size of 1.6 inch/ 4 cm in diameter, each is individually packaged in a clear plastic box, sufficient quantity can meet your multiple using needs
- Quality Metal Material: the decision coins are made of quality alloy, strong and sturdy, not easy to break or deform, can be applied for a long time
- Make a Decision: the lucky coin is designed with 'yes' and 'no' on both sides, which allows you to make a decision after flipping
- Exquisite Patterns: the two face coin is decorated with sun, moon, hands, evil eye, and other patterns, exquisite and beautiful
- Exquisite Patterns: the two face coin is decorated with sun, moon, hands, evil eye, and other patterns, exquisite and beautiful
If a project needs cryptographically strong random values in a browser, MDN documents crypto.getRandomValues() for that purpose. The W3C Web Cryptography API specification likewise describes the method as generating cryptographically strong random values, while noting that the specification sets no lower bound on information-theoretic entropy and that implementations should make a best effort to provide as much entropy as practicable. Using that API would change how a random value is generated; it would not make a yes–no answer meaningful or turn the oracle into sound decision advice.
What it is—and is not—useful for
The oracle fits low-stakes play: it can add a bit of randomness to an inconsequential choice or demonstrate basic browser JavaScript and local storage. It should not decide whether to take a job, make a financial trade, or act on a relationship concern. A binary answer generated from a hash and click timing has no access to the facts, priorities, or consequences needed to advise on those questions.
Rank #4
- Diameter: 1.57" (40mm); depth: 0.12" (3mm), each coin comes with an acrylic protective case.
- These coins are extremely high-quality with a nice design: "YES" on one side and "NO" on the other.
- It is very durable and has a "yes" and "no" on either side. Head coins are a great addition to your divination tools blessed be.
- This is the coolest coin you've ever seen. Devil coin will make the decision for you if you had trouble choosing heads or tails.
- Our coins are good for party games. Great for making decisions, double head coin is nice for making simple, small decisions.
The author says the project has answered “thousands” of questions, including about jobs, relationships, and crypto trades. The article does not provide a measurement method or supporting dataset, so those are the author’s claims rather than independently verified usage figures.
Quick Recap
Best Value
- Do you have choice difficulties? Don¡¯t know what to do? Throw a coin and let it decide!
- Let your spirit guides help you to make that decision with this easy-to-use divination tool. This is a Yes Or No coin which is also sometimes called a Prediction Coin. The coin is easy to use. Ask a question and toss the coin for your answer.
- Coins are two-sided and fully embossed with detailed imaging. The diameter of the coin is 40 mm (~1.6 inches) and with a thickness of 3 mm (~0.12 inches). Made of high-quality copper material, wear-resistant and durable, can be stored and used for a long time. The coin is very small and easy to store, you can take it with you.
- It's a quirky item and an excellent gift idea - perfect for anyone with an interest in coin collecting or who needs to be better at decision-making.
- Every item is designed with Mother Earth in mind by using materials that can be easily recycled. We treat each and every order with thought and care.
What to check when adapting the idea
- Repeat behavior: Decide whether identical questions should yield a stable answer or whether variation is part of the toy’s appeal.
- Answer generation: Keep a simple custom function clearly labeled as playful; use
crypto.getRandomValues()if cryptographically strong random values are actually required. - Local retention: Tell users what the page saves, where it saves it, and how they can clear it. The sample’s history is capped at 15 entries.
- External dependencies: Check for CDN scripts, fonts, analytics, or other remote resources before claiming that a page makes no external requests.
- Decision stakes: Keep the output separate from advice, especially when a choice has financial, employment, health, or personal consequences.
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