A free alternative to Glassnode and CoinGlass: an honest comparison
Glassnode is professional on-chain analytics; CoinGlass is derivatives data. Both go deeper than us in their niches, and many of their features are paid. 21btc.cc covers the core Bitcoin questions for free, with no sign-up and a named source on every number.
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What 21btc.cc has and doesn't have
| Price, Fear & Greed, MVRV, realised price | yes → |
| Spot ETF flows and holdings per fund | yes → |
| Holders: companies, funds, governments | yes → |
| Exchange reserves and large whale transfers | yes → |
| Risk On/Off composite with open formulas | yes → |
| Volatility, rainbow model, stock-to-flow | yes → |
| Mining and fee calculators | yes → |
| Open JSON API, no key | yes → |
| Derivatives: liquidations, funding rates, open interest | no |
| Hundreds of on-chain metrics at intraday resolution | no |
| Altcoins | no (Bitcoin only) |
When to pick them instead
- You need derivatives (liquidations, funding, open interest): CoinGlass.
- You need hundreds of on-chain metrics, cohorts and intraday data: Glassnode.
- You need altcoins: both cover them, we don't.
Glassnode and CoinGlass plans and features change; check their sites: glassnode.com, coinglass.com.
FAQ
- Is 21btc.cc completely free?
- Yes, every page and the open API are free and need no sign-up.
- How fresh is the data?
- Every number shows its source and a London time. Prices are live, ETF flows update daily, free-tier on-chain data lags about a week.