Label Smarter. Train Faster.

Snowball adapts as you work — no cloud, no clutter, just results.

Pro Tier: Unlock AI suggestions & adaptive fine-tuning that learns from you.

AI-Powered Suggestions (Pro)

Stop drawing every box. Snowball's integrated model provides real-time bounding box suggestions (dashed green). Double-click a suggestion to accept it instantly. Adjust the confidence threshold to control quality.

Adaptive Fine-Tuning (Pro)

Snowball gets smarter! As you approve annotations, the model automatically fine-tunes itself in the background (at 20/100 image intervals by default). Suggestions become progressively more accurate for your objects.

Local First & Hassle-Free

Your data stays on your machine. Snowball runs entirely locally, requiring no cloud uploads for core annotation and training, ensuring privacy and speed. Simple installation, no complex dependencies.

Direct YOLO Export

Ready to train externally? Export approved annotations directly into the standard YOLO format (images, labels, train/val split, `dataset.yaml`). Seamlessly integrate with your existing pipelines.

How Snowball Works

Follow these steps to accelerate your annotation process:

Load Images: Start a new session by loading your image directory. Snowball finds compatible images.
Annotate Manually: Use the 'Draw BBox' tool to draw boxes around your objects. Double-click a box to change its class.
Get Suggestions (Pro): Check 'Show Suggestions'. AI provides real-time bounding boxes (dashed green). Double-click to accept!
Approve: Review annotations and click 'Approve & Next Unannotated' to confirm the image and move efficiently.
Auto-Train (Pro): As you approve images (e.g., every 20 or 100), Snowball automatically fine-tunes the suggestion model in the background. No extra steps needed!
Better Suggestions (Pro): Continue annotating – notice how the AI suggestions improve and adapt to your specific objects over time!
Export Data: Anytime, export your approved dataset in standard YOLO format (with train/val split & `dataset.yaml`) for external training.
Export Model (Pro): Export the fine-tuned `.pt` model generated by Snowball for use in other applications or inference pipelines.

Training Dashboard (Pro)

Take control of the adaptive learning process. The integrated Training Dashboard gives Pro users insight and configurability:

Visualize Progress: Track mAP and Loss curves plotted directly from training `results.csv`.
Configure Training: Adjust epochs and learning rates for the automatic 20/100 image fine-tuning triggers.
Tune Augmentations: Control data augmentation settings like vertical/horizontal flips and rotation degrees.
Toggle Triggers: Easily enable or disable the automatic 20/100 image training triggers.
Access Runs: Quickly open the folder containing the logs and weights from the latest training run.

See Suggestions in Action!

AI suggestions appear automatically. Double-click to accept & speed up labeling! (Pro)

(Example workflow showing AI-powered suggestions)