Baking sourdough bread is a practice rooted in tradition, relying on natural fermentation and wild yeast rather than the predictable commercial yeast found in most kitchens. For centuries, bakers have nurtured their starters with regular feedings of flour and water, monitoring temperature and activity to ensure a healthy, bubbly culture. This ritual, while rewarding, can be time-consuming and repetitive. Enter the Sourdough Sidekick, a countertop appliance designed to automate the most tedious part of the process: starter management.
What Is the Sourdough Sidekick?
The Sourdough Sidekick is a joint project between FirstBuild—the GE Appliances innovation hub responsible for the viral Opal ice maker—and King Arthur Baking Company, a name synonymous with high-quality flour and baking expertise. The device launched via a crowdfunding campaign in March 2025 and is now available for direct purchase from King Arthur for $179.99. It is currently available only in the United States.
The basic premise is simple: instead of manually feeding your starter every day—discarding part, adding fresh flour and water, and mixing—the Sidekick handles this on a programmable schedule. You drop a small amount of existing starter (15 grams, about a tablespoon) into a glass crock, fill two dispensers with flour and water, and set a target time for when you want your starter to be at its peak. The machine then drip-feeds the correct amounts at intervals, mixing automatically, so that when you're ready to bake, you have a perfectly active starter ready to use.
How It Works: Auto Mode
In Auto mode, you simply tell the Sidekick when you plan to bake and how much starter you'll need for your recipe. The device takes into account the ambient temperature and adjusts the feeding schedule dynamically. For example, if you set a bake goal three days out, the Sidekick will feed your starter more frequently as the target approaches, ensuring it peaks exactly at your designated time. In testing with standard white bread flour, this function worked seamlessly. A strong, healthy starter was produced, yielding a decent white loaf—perhaps even overproofed, indicating the starter was more active than typical manual feeding.
However, Auto mode has quirks. It requires you to always start with exactly 15 grams of starter, so you must weigh that out each time. More notably, the minimum starter amount the machine will produce depends on the time horizon. For a bake three days away, it can make as little as 150 grams, but for four days or longer, it insists on at least 400 grams. This can result in significantly more discard (excess starter) than manual feeding would create. There is no automated maintenance mode for keeping a starter alive without a specific bake goal; you must either set an arbitrary date (producing discard) or remove the crock and refrigerate it manually.
Ratio and Custom Modes
Beyond Auto, the Sidekick offers Ratio mode, which provides preset feeding ratios (typically 1:1:1 starter:flour:water) and lets you set the seed amount and feeding frequency. The limitation is that it only varies the proportion of starter relative to flour and water, not the ratio between flour and water themselves. For a thicker or thinner starter—for example, when using coarse rye flour that requires more water—the Ratio mode is insufficient.
Custom mode fills this gap. Here you can set the exact amounts of flour and water per feeding, along with seed amount and frequency. This allows for a looser starter when using denser, coarser flours. It also enables creation of a starter from scratch, or rehabilitation of a weak starter. FirstBuild provides instructions for a four-day starter development using Custom mode. However, neither Ratio nor Custom modes account for ambient temperature, so you must monitor starter activity manually.
Design and Daily Use
The Sidekick is a compact countertop appliance with a glass crock, a hinged paddle for mixing, a water tank at the back (detachable for filling), and a flour hopper at the top. Controls consist of a few buttons and a dial. The device has a small screen that displays status and timers. It also offers optional Wi-Fi connectivity and a companion app, but these are not essential—the app mirrors what the screen shows and sends notifications when starter is ready or discard needs removal. Most users will find the app unnecessary.
Cleanup is a notable aspect. FirstBuild recommends washing the glass crock, lid, and paddle by hand after every feeding cycle to prevent buildup and mold. The crock and lid are not dishwasher-safe. The water tank and flour hopper can go in the dishwasher, but need less frequent cleaning. This hand-washing requirement can be a deterrent for users seeking convenience.
Noise is another factor. The Sidekick stirs the starter every two hours by default, producing a 30-second loud whirring each time. In a small kitchen or apartment, this can become annoying, especially if the device is used continuously.
Who Is It For?
The Sourdough Sidekick is best suited for dedicated sourdough bakers who bake at least once a week, ideally twice. For someone who bakes a loaf every week or more, the device simplifies the daily feeding cycle, removing the need to remember feedings and monitor starter health. Frequent bakers will appreciate having perfectly timed starter ready without the mental overhead.
For occasional bakers—say, one loaf every two weeks or less—the Sidekick may be more hassle than help. You would need to manually refrigerate the starter between uses, losing the benefit of automated feeding. The cost ($180) and counter space requirement also need justification. Many users may find that traditional jar-and-spoon methods suffice.
Background and Alternatives
Sourdough has seen a resurgence in popularity, partly fueled by pandemic-era home baking and a growing interest in fermented foods. Maintaining a starter requires regular feeding—typically daily at room temperature or weekly in the fridge. Devices like the Sourdough Sidekick aim to automate this chore, similar to how bread machines automate kneading and proofing. But unlike bread machines, which are versatile for various loaves, the Sidekick is single-purpose: it only manages your starter. You still need to mix, shape, proof, and bake the dough yourself.
Other automated feeding methods exist, such as DIY setups using peristaltic pumps or programmable feeders, but these lack the polished design and temperature sensing of the Sidekick. The partnership with King Arthur adds credibility, as the company has deep expertise in sourdough.
Performance with Different Flours
The Sidekick handles most standard flours—white, whole wheat, rye—provided they are not extremely coarse. In testing, a coarse-milled rye flour from a British mill produced a starter too thick for the paddle to mix properly, leading to dry clumps and inconsistent hydration. Custom mode allowed adjusting the water amount to achieve a workable consistency, but this required extra effort. Users who frequently switch between flour types will need to recalibrate each time, which takes a few minutes.
Smart Home Integration
While the Sidekick has Wi-Fi, it is not a fully connected smart home device. The app provides notifications and status checks, but you cannot change settings remotely or integrate with assistants like Alexa or Google Home. This limits its appeal for tech-focused home bakers who might expect more advanced automation. The device's internal temperature sensor is used for Auto mode, but it does not connect to external weather data or learn from historical usage.
Historical Context and Future of Kitchen Gadgets
The rise of single-purpose kitchen gadgets has been met with mixed reactions. The Opal ice maker was a viral success, and the Sourdough Sidekick follows a similar model—targeting a niche but passionate audience. However, critics argue that such devices contribute to clutter and are rarely worth the investment unless used very frequently. The sourdough community itself is divided: purists may see automation as undermining the craft, while pragmatists welcome the convenience.
Looking ahead, more such specialized gadgets may emerge as consumer interest in fermentation and artisan baking grows. The key will be balancing ease of use with flexibility. The Sidekick's Custom mode is a step in the right direction, but its lack of a true maintenance mode and dishwasher-safe parts are drawbacks.
Final Thoughts on Practicality
For a baker who produces two loaves per week and has ample counter space, the Sourdough Sidekick can be a valuable tool. It reliably handles starter feeding, freeing up time and mental energy. The learning curve is modest, and once set up, it runs quietly—apart from the aforementioned stirring noise. The price points comparable to a mid-range bread machine, but since you still need to bake manually, the value proposition depends heavily on usage frequency.
If you bake sporadically or enjoy the hands-on routine of feeding your starter, the Sidekick may feel superfluous. The manual process is not particularly difficult, and many bakers derive satisfaction from nurturing their starter. However, if the daily feeding is a barrier to baking more often, the Sidekick could enable a more regular baking habit.
Ultimately, the Sourdough Sidekick delivers on its promise: it automates the boring bit. But it demands a commitment—both financial and spatial—that not every baker will want to make. For those who do, it's a well-executed gadget from a reputable collaboration.
Source: The Verge News