Thumbnail Analysis — TubeLog Score

TubeLog Score is a composite AI grade (0–100) that evaluates how effective your YouTube thumbnail is likely to be at driving clicks.

#How It Works

TubeLog Score combines two AI models:

| Model | What It Measures | Weight | |-------|-----------------|--------| | DeepGaze (eye-tracking AI) | Where viewers look first — predicts visual attention heatmap | 50% | | CLIP (content relevance) | How well the thumbnail image matches its title/topic | 50% |

#DeepGaze Eye-Tracking

DeepGaze is a deep neural network trained on human eye-tracking data. It generates a saliency heatmap showing where a viewer's gaze is drawn within the first 3 seconds of seeing your thumbnail.

• Bright red/orange zones = high attention areas
• Blue/green zones = low attention areas
• Your subject's face, text, and high-contrast areas typically score highest

#CLIP Content Relevance

CLIP (Contrastive Language-Image Pretraining) measures how semantically aligned your thumbnail image is with your video's title and topic.

• Score above 70 = strong alignment
• Score below 40 = thumbnail may confuse viewers or misrepresent content

#TubeLog Score Grades

| Grade | Score | Meaning | |-------|-------|---------| | S | 85–100 | Excellent — high CTR potential | | A | 70–84 | Good — above average performance | | B | 55–69 | Average — improvement recommended | | C | 40–54 | Below average — significant changes needed | | D | 0–39 | Poor — consider redesigning |

#Running an Analysis

Credit cost: 5 credits per analysis

1. Navigate to Thumbnails → Analysis tab
2. Select a video from your channel or upload a thumbnail image directly
3. Optionally enter the video title for CLIP scoring
4. Click Analyze
5. Results appear within 10–30 seconds

#Reading Your Results

#Score Breakdown

After analysis, you'll see:

• Overall TubeLog Score (0–100)
• Eye-tracking score — DeepGaze saliency rating
• Relevance score — CLIP semantic alignment
• CTR prediction — Estimated click-through rate compared to your channel average

#Heatmap Viewer

The heatmap overlay shows exactly where viewers' eyes are predicted to land. Use this to:

• Verify your subject/face is in a high-attention zone
• Check that key text is readable and in a visible area
• Identify elements that may be drawing attention away from your CTA

#Scroll Heatmap (Full-Screen Mode)

For a more accurate simulation of how your thumbnail appears in the YouTube feed:

1. Click Fullscreen Preview on any thumbnail
2. The preview captures the full scrollable feed simulation
3. Click Analyze with Scroll to run DeepGaze on the feed-context view
4. This mode shows how competing thumbnails affect your thumbnail's attention score

#Comparing Thumbnails

You can compare up to 4 thumbnails side by side using the Compare tab:

1. Select your current thumbnail
2. Add competitor thumbnails (search YouTube or upload directly)
3. Run batch analysis
4. TubeLog shows a ranked comparison with scores for each

#Auto-Replacement

Once you identify a winning thumbnail from comparison analysis, use Auto-Replacement to:

1. Schedule the thumbnail swap at a specific time
2. Track CTR change before and after replacement
3. View the replacement timeline with CTR/impressions logged per phase

Tip: Run analysis before and 48 hours after publishing to capture early-viewer attention patterns.