Side by side
Let Me Know When vs Size the Market
Compare what each tool does, what it costs, and how it fits your workflow.
Designed for
AI-powered alerts for website changes
Fast, accurate pricing intelligence for e-commerce.
Primary task
Website monitoring
Price tracking
Pricing
Freemium · Free + from $9.99/mo
Paid · from $449/mo
Pricing details
Free + from $9.99/mo
from $449/mo
Billing cycle
Monthly
Monthly
API access
Not documented
Listed as available
Platforms
Web
Web
Integrations
Slack
Not documented
Source rating
3.0 / 5 · 4 ratings
5.0 / 5 · 1 ratings
Catalog views
6.4k
765
Estimated monthly traffic
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Catalog imported
30 Aug 2026
31 Aug 2026
Listed strengths
- Free website monitoring
- Competitor analysis
- Price change alerts
- Stock availability notifications
- Design change detection
- Thorough pricing intelligence
- Swift tracking and analysis
- Provides actionable insights
- Aids strategic pricing decisions
- Matches products using ML
Listed limitations
- Paid plans expensive
- Only email, Slack notifications
- No multi-language support
- No mobile app
- No social media alerts
- No predictive analytics
- No support for multi-currency
- No specific strategy recommendations
- Doesn't integrate with all platforms
- Lack of granular reporting