A sourdough recipe says proof for four hours. The kitchen does not read the recipe. At 18 °C in winter the same dough takes nine hours; at 27 °C in summer it takes four. So most home bakers guess, and most loaves go into the oven over-proofed or under-proofed - and the baker only finds out when they cut it open.

• The recipe gives a time. The dough gives a height. Only one of them is true in your kitchen.

You put the dough in the chamber, pick a temperature on the app, and tap Start proof. The controller holds the chamber within half a degree of that setting, and the time-of-flight sensor in the lid measures the distance down to the dough every 30 seconds. Height is the lid height minus that distance. The app plots it, and when the slope of the last readings flattens it sends one notification: your dough peaked, bake in the next 20 minutes.

• One set point, one button, one notification. Everything else is the log.

Roughly 2 million people in the US and EU bake sourdough weekly, and they already spend $150 to $250 on proofers, bannetons and Dutch ovens. PeakBox sits between a basic proofing box that only heats and a full fermentation chamber, at a price inside what that buyer already pays.

• A basic proofer holds a temperature and stops there. None of them tell you when the dough peaked, and none of them remember your last bake.

The device sells direct for $179 and the companion app is free. Of that $179, about $79 is the known parts cost at single-unit hobbyist prices; the other $100 has to cover the enclosure, assembly, packaging, delivery and the margin, and the enclosure quote is the number that decides whether those unit economics work. An optional bakers' log and recipe-tuning subscription is $4 a month.

• The moat is personal rise history that improves with each bake - a baker who has logged twenty proofs in their own kitchen has something no recipe can give them.

Four things, in order. That a $14 time-of-flight sensor reads dough height reliably through the steam and condensation of a warm humid chamber. That the peak rule fires at the right moment on real dough, not just on the simulator's curve. That the enclosure can be made near the parts price. That a heated plywood box passes the safety testing a home appliance needs.

• This page stays in the deck on purpose. A hardware pitch that hides its risks is asking you to find them yourself.

PeakBox is in a live public first round, raising $375,000 - the hardware-track figure. The money buys de-risking steps in a named order: a first chamber built to the blueprint and twenty real bakes to calibrate the peak rule; then enclosure tooling, the Bluetooth link, compliance testing and product liability insurance for a heated home appliance; and under it all, eighteen months of operating cost. Offers are non-binding and start at $1: no card, no money moves, and nothing is binding until the round closes and the company is incorporated.

• No return is guaranteed. We recommend understanding the model, the business plan, and the risks before investing actual money. Consider independent professional advice if needed. Dream x Destiny does not provide investment advice.

Gemini audited the product and called the pain point clear and the price competitive within the market for specialised baking equipment. Grok named it, wrote the voice, set the palette and the plan on X, and put the moat in one line: personal rise history that improves with each bake. monday's board showed Gemini green, Grok yellow for the unfinished cadence, and no drift between them.

• Real artefacts only. Each reading below names the file it came from.