What the Sourdough Sidekick Does
Sourdough starters die from neglect — a missed feeding can kill weeks of cultivated yeast culture. The Sidekick solves that by automating the feeding process entirely.
The device houses a removable water tank and a flour hopper, dispensing precise amounts into a King Arthur-branded glass crock on a schedule it calculates itself. A companion mobile app lets bakers monitor their starter remotely and receive alerts when action is needed.
The key technical feature is temperature-aware scheduling. In Auto Mode, the Sidekick reads ambient kitchen temperature and adjusts feeding frequency accordingly — warmer kitchens mean more active starters that need more frequent care.
Three Operating Modes
The device offers three modes designed for different skill levels and baking styles.
Auto Mode is aimed at beginners and busy bakers. Users tell the Sidekick when they need starter ready (down to the day and hour), and the device handles all feedings automatically — with no discard required for up to a week.
Ratio Mode follows traditional feeding rhythms. The machine fires on a set interval and sends alerts when the baker needs to use or discard a portion, preserving conventional baking habits without requiring constant attention.
Custom Mode gives experienced bakers full control over hydration levels, flour amounts, and timing — useful for bakers developing proprietary starter protocols or testing different flour types.
How It Got Here
The Sourdough Sidekick started as an Indiegogo campaign in March 2025. It hit its crowdfunding goal in 12 minutes. FirstBuild subsequently shipped units to thousands of backers before the May 1 nationwide retail availability.
The collaboration with King Arthur Baking Company — the oldest flour company in the US — was central to the product's design. King Arthur's team helped shape the "microfeeding" methodology built into Auto Mode, which builds a starter gradually without generating the volume of discard that traditional daily feedings produce.
"The best products come from building alongside the people who will actually use them," said André Zdanow, President of FirstBuild. King Arthur VP John Henry Siedlecki described the product as "designed to honor the craft of sourdough while solving real challenges bakers face."
Pricing and Availability
The Sourdough Sidekick retails for $179.99 and is available directly at SourdoughSidekick.com and KingArthurBaking.com.
One important caveat: as of mid-May 2026, the King Arthur store lists a ship date of June 18, 2026 for new orders. Buyers placing orders now should expect delivery roughly a month out rather than immediately.
The device ships with a glass crock, mixing paddle, flour hopper, water tank, and power supply. No subscription or proprietary consumables are required — any all-purpose flour works.
Early Reception
The product carries a 4.2 out of 5 rating across 14 early reviews on King Arthur's store. That sample size is small, but the rating tracks with the strong pre-sale demand signaled by the Indiegogo campaign.
No independent long-term tests from major outlets (Wirecutter, Serious Eats, America's Test Kitchen) have been published as of this writing. Bakers considering a purchase should factor in that this is a first-generation appliance with limited public testing data.
Why This Matters
Sourdough baking surged during the pandemic and has stayed popular among US home cooks who want more control over their bread. The single largest drop-off point is starter maintenance — it requires daily attention that doesn't fit into most schedules. A dead starter means starting over from scratch, often weeks of work.
The Sourdough Sidekick directly addresses that barrier at a price point that sits below most stand mixers. For home bakers who have tried and abandoned sourdough, or who travel regularly, this is the first purpose-built appliance that makes ongoing starter care genuinely hands-off. The King Arthur partnership also adds meaningful credibility — this isn't a gadget company guessing at baking science.
At $179.99, it won't appeal to casual bakers. But for committed sourdough enthusiasts, the math is straightforward: the cost of a dead starter in time and flour often exceeds that after a few failed batches.
Conclusion
GE Appliances and King Arthur have delivered a focused, well-conceived product for a real problem home bakers face. The nationwide launch on May 1 marks the first time the Sidekick is available to the general public after a strong crowdfunding run. Bakers interested in the device should note the current June 18 ship date before ordering.