SBL
Utility custom nodes for ComfyUI, including prompt, resolution, math, seed/noise, and model-specific resolution helpers.
SBL
SBL is a collection of utility custom nodes for ComfyUI.
Included nodes
Global Prompt (Pos/Neg)
Outputs reusable positive and negative prompt strings.
Resolution
Provides resolution presets, aspect-ratio groups, custom dimensions, and multiple-of snapping.
Math Evaluator
Evaluates mathematical expressions and small multi-line math programs with float and integer outputs.
Seed
Outputs a seed and ComfyUI noise object, with a frontend randomize button.
Qwen 2512 t2i resolutions
Provides preset image resolutions for Qwen 2512 image generation workflows.
ZiT t2i resolutions
Provides preset image resolutions for ZiT image generation workflows.
Math Scratchpad
Interactive multi-line mathematical scratchpad with variables, functions, loops, comprehensions, and displayed output.
All nodes appear under the SBL category in ComfyUI.
Installation
ComfyUI Manager
Install SBL through ComfyUI Manager.
Manual installation
Clone the repository into your ComfyUI custom_nodes directory:
git clone https://github.com/SoftByteLabs/SBL
Restart ComfyUI after installation.
Dependencies
SBL has no additional third-party Python dependencies beyond the packages included with ComfyUI.
Math safety
The Math Evaluator and Math Scratchpad use a restricted AST-based interpreter rather than Python exec() or eval().
They support a broad range of mathematical Python-style syntax while blocking arbitrary code execution, unrestricted imports, filesystem access, subprocess execution, object introspection, and other unsafe operations.
License
Copyright © 2026 SoftByteLabs
SBL is free software licensed under the GNU General Public License v3.0 or later.
You may use, study, modify, and redistribute SBL under the terms of the GPL. Redistributed copies and modified versions must preserve the applicable copyright and license notices and remain available under the GPL terms.
See the LICENSE file for the full license text.