RoasTime 4 and Aillio Bullet software: download, firmware, and alternatives.

Direct Answer

RoasTime is the native Aillio Bullet software and should remain the starting point for Bullet-specific operation and Aillio ecosystem workflows. Artisan is a flexible roast logger for users who want detailed setup control. Rostoc is a fit when the Bullet roast should connect to green inventory, plans, batches, notes, and production history.

For Rostoc, treat Aillio support as experimental read-only logging until you validate readings and saved records on your exact Bullet model.

Where to download RoasTime 4

Download RoasTime 4 from Aillio directly: roastime4.aillio.com. Aillio describes RoasTime 4 as its Bullet software for logging, analysis, automation, and Roast.World access, with desktop downloads on that site. Rostoc does not distribute, modify, or host RoasTime.

If you came here looking for RoasTime itself, that link is the one you want. The rest of this guide is for Bullet owners who are troubleshooting a connection or comparing RoasTime with other roast software.

Bullet R1 firmware 626 and later

From Bullet R1 firmware 626, the R1 and R1 IBTS present a standard serial COM port to the computer instead of the older direct USB device. Your operating system's built-in driver handles it, so do not replace that driver. The Bullet R2 still uses the direct USB connection.

This change matters for any third-party logger, not just Rostoc: whichever software you use needs to support the serial connection on your firmware. Only one application can hold the serial port at a time, so close RoasTime or any other logger before testing another one.

Rostoc tries the direct USB connection first and falls back to the serial port automatically. Use Rostoc 0.3.74 or later on firmware 626 and newer, and validate the first roasts, because serial-port support is newer than the direct USB path.

Quick comparison

The search question behind Aillio Bullet software is usually not just which app can draw a curve. It is which app should own the roast, the machine-specific workflow, and the operational record after the roast ends.

When Rostoc is the right addition

Rostoc is strongest when the roast record needs to answer operational questions after the curve is drawn. Which green lot did this roast consume? Which plan was used? Which batch did the team produce? Which notes and quality decisions should be available next time?

That is why Rostoc can be useful even when RoasTime is already working. The point is not to replace every Bullet-specific workflow; the point is to keep production context in the same workspace as the roast record.

• Use Rostoc when a Bullet roast should deduct from or reference green inventory.
• Use Rostoc when the roast should be tied to plans, batches, notes, and team records.
• Use Rostoc when future production needs a searchable history instead of isolated curve files.
• Keep native Bullet software available until Rostoc readings are validated on the exact machine.

When to stay with RoasTime or Artisan

Stay with RoasTime for native Bullet operation, machine-specific behavior, automation, and Roast.World ecosystem workflows. Stay with Artisan when the main need is highly configurable local logging and the operator is comfortable maintaining the technical setup.

Rostoc should not be positioned as the universal replacement for those tools. It is better described as the roastery record layer that can receive validated Bullet roast data.

Validation workflow before production use

A short validation roast is better than a long debugging session during production. Add the exact Bullet catalog entry, close other software that may own the USB device, record a short run, compare live values, and reopen the saved batch.

• Confirm the exact Bullet generation: R1, R1 IBTS, or R2.
• Use the Rostoc Aillio catalog entry instead of a generic serial device.
• Compare bean temperature and environment, drum, or IBTS readings with a trusted reference.
• Check that heater, fan, drum, and power-related streams appear as feedback rather than temperatures.
• Reopen the saved batch and confirm labels, values, and chart routing still make sense.

Sources and further reading

Aillio describes RoasTime 4 as its Bullet software path for logging, analysis, automation, Roast.World access, and desktop downloads: Aillio RoasTime 4.

Artisan documents Bullet R1/R2 support through a vendor-specific USB protocol: Artisan Aillio machine page.

For Rostoc setup specifics, read the Aillio Bullet integration page and Aillio Bullet USB docs.

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