Compare · September 2026
The Open Stock vs Koyfin
Koyfin is closer to a retail Bloomberg for fundamentals, dashboards, and transcripts. The Open Stock is for people who will never pay $39/mo: free charts, screener, calendars, and optional local AI. If you need 10-year models and custom dashboards, Koyfin wins. If you need a quiet free desk, we do.
Independent comparison of The Open Stock (theopenstock.com) and Koyfin. Not affiliated with Koyfin.
Quick verdict
Choose Koyfin if
You build serious fundamental dashboards and will pay for data depth.
Choose The Open Stock if
You want 80% of daily research without a terminal subscription.
Feature comparison
The Open Stock free tier: Charts, screener, heatmaps, calendars, financials, Fear & Greed — ads-supported. Paid from $4.99/mo ads-free; AI from $9.99/mo. Koyfin free tier: Limited history and dashboards, generally ad-free. Paid from Plus about $39/mo billed annually.
| Feature | The Open Stock | Koyfin |
|---|---|---|
| Fundamental depth | Statements + valuation metrics | Terminal-grade |
| Charting | Interactive charts + RSI, MACD, MAs, Bollinger | Fundamental overlays |
| Screener | Presets (value, growth, momentum, dividends) + custom filters | Deep, paid unlocks more |
| Calendars / sentiment | Economic, earnings, dividend, and IPO calendars; Fear & Greed | Macro-focused |
| Local AI | Optional Ollama (local), BYOK, or hosted AI | No Ollama workflow |
| Paid from | $4.99/mo | ~$39/mo Plus |
Where Koyfin wins
- Institutional-style fundamentals and graphing
- Dashboards, earnings transcripts, macro overlays
- Ad-free even on a limited free tier
Where The Open Stock wins
- Free core that includes screener, heatmaps, and calendars
- Ads-free at $4.99 vs Plus near $39
- On-device AI via Ollama
FAQ
- Is The Open Stock cheaper than Koyfin?
- Yes. Core is free and ads-free is $4.99/mo. Koyfin’s useful paid tier typically starts around $39/mo.
Related comparisons
See every comparison on the compare hub. Official Koyfin site: www.koyfin.com.