Report updated Apr 16, 2026
Weights & Biases
For machine learning engineers, data scientists, and AI researchers who need to monitor long-running training jobs and experiments while away from their workstations.
Weights & Biases is a challenged developer tools app that is free with in-app purchases. With a 3.4/5 rating from 29 reviews, it faces significant user friction. Users particularly appreciate core utility, though display/rendering issues remains a common concern.
What is Weights & Biases?
Current Momentum
v26.4
What's New: - Run overviews are accessible as a tab directly on the run page, so you can get to your run details without digging through a menu. - Use regular expressions in the metric search bar to find exactly the charts you're looking for.
Active Nemesis
Comet ML
By Comet ML
Other Rivals
7-Day Rank Pulse 🇺🇸
Developer ToolsRating Pulse 🇺🇸
Recent User Mood
What makes this app unique?
What Does It Look Like?
What Are The Key Features?
Monitor machine learning training runs and experiments live from a mobile device.
Receive alerts when training runs finish, fail, or when key metrics change.
Zoom and pan through training curves and performance metrics.
Track loss, accuracy, throughput, and custom metrics across projects.
Connects securely to existing W&B projects without needing to rebuild dashboards.
How much does it cost?
- Free mobile app access
- Enterprise/Professional tiers available via the main W&B platform
The mobile app acts as a utility extension for the core W&B platform, likely driving retention and engagement for existing professional users rather than serving as a standalone revenue product.
Who Built It?
Providing machine learning engineers and developers with mobile observability and remote environment access to manage long-running experiments away from the workstation.
Portfolio
2
Apps
What other apps does Weights and Biases make?
Explore the full Weights and Biases report
Portfolio breakdown, audience, momentum, and every app published by Weights and Biases.
What do users think recently?
Medium confidence · 28 reviews analyzed
How did the latest release land?
What is the recent mood?
Recent user voice shows a frustrated sentiment. Users appreciate core utility, but report display/rendering issues and privacy concerns.
Limited review volume (28 reviews). Sentiment analysis will deepen as more data lands.
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Weights & Biases?
Where is it available?
Localized markets (1)
How's The Developer Tools Market?
How does it evolve in the Developer Tools market?
Rank progression
52 active rankings tracked — 30-day window
The rivals identified
The outtake for Weights & Biases
Strengths to defend, gaps to attack
Core Strengths
- Seamless integration with W&B ecosystem
- Real-time visualization capabilities
- Strong brand presence in AI research
- Effective push notification system
Critical Frictions
- Critical rendering bugs (blank/gray screens)
- High-friction accessibility permission requirements
- Significant version lag on Android
- Limited feature set compared to web dashboard
Growth Levers
- Exploit competitor instability in mobile monitoring
- Expand into model serving and production monitoring
- Implement mobile-native widgets for quick status checks
- Improve Android parity to capture broader developer market
Market Threats
- Direct competition from Comet ML's mobile app
- Established observability players (Datadog) moving into MLOps
- User reliance on Slack/Discord for notifications due to app instability
- Declining category rankings indicating loss of momentum
Key Takeaways
Weights & Biases is a challenged developer tools app that is free with in-app purchases. With a 3.4/5 rating from 29 reviews, it faces significant user friction. Users particularly appreciate core utility, though display/rendering issues remains a common concern.
Where Is It Heading?
Trend analysis
Available very soon