Koyfin vs Polygon.io (2026) — Which Is Better?
Compare Koyfin and Polygon.io — features, pricing, pros and cons.
Quick Verdict
Higher Rated
Polygon.io (4.4)
More Affordable
Koyfin (Free)
Koyfin
★★★★☆ 4.3/5
Bloomberg-alternative financial data platform for retail investors with advanced charting, screening, dashboards, and fundamental analysis at a fraction of the cost.
From: Free
Full review →
Polygon.io
★★★★★ 4.4/5
Institutional-grade financial data API with real-time WebSocket streaming, tick-level data, and broad market coverage.
From: Free
Full review →
Feature Comparison
| Feature | Koyfin | Polygon.io |
|---|---|---|
| Rating | ★ 4.3 | ★ 4.4 |
| Starting Price | Free | Free |
| Free Tier | Yes | Yes |
| Markets | stocks, options | stocks, options, forex, crypto |
| AI Analysis | ✗ | ✗ |
| Backtesting | ✗ | ✗ |
| Paper Trading | ✗ | ✗ |
| Price Alerts | ✓ | ✗ |
| Mobile App | ✗ | ✗ |
| API Access | ✓ | ✓ |
| Social Features | ✗ | ✗ |
| Broker Integration | ✗ | ✗ |
| Custom Indicators | ✓ | ✗ |
| Automated Trading | ✗ | ✗ |
| Trade Journaling | ✗ | ✗ |
| Performance Analytics | ✓ | ✗ |
| Risk Management | ✗ | ✗ |
| News Feed | ✓ | ✓ |
| Education Content | ✗ | ✗ |
Koyfin: Pros & Cons
Pros
- + Bloomberg-quality data at 1/50th of the price
- + Excellent data visualization and custom dashboards
- + Global market coverage across 50+ exchanges
- + Generous free tier for basic research
- + Excel integration on Pro and above plans
Cons
- - No trade execution — research and analysis only
- - No mobile app available yet
- - Primarily focused on equities and ETFs
- - Can be overwhelming with the amount of data available
- - Real-time data requires paid subscription
Polygon.io: Pros & Cons
Pros
- + WebSocket streaming for real-time data
- + Tick-level historical precision
- + Generous free tier at 5 req/min
- + Institutional-grade data quality
Cons
- - Real-time data requires $199/mo plan
- - Can be complex for non-developers
- - Options data costs extra
- - Less beginner-friendly than Alpha Vantage
Guides & Tutorials
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