The Best Bitcoin Block Explorers Compared (2026): Mempool.space, Blockstream, and More
The Bitcoin blockchain is a public ledger. Anyone can read every transaction, every address balance, every block. The challenge is making that public data useful without leaking what you're interested in to whoever runs the website you're using to read it.
Block explorers solve the readability problem. Self-hosted explorers solve the privacy problem too. This guide walks the credible options in 2026 and which one to use for which job.
Mempool.space
The default. mempool.space is open source, well-maintained, and the only major explorer with a true visual mempool — the colored blocks showing pending transactions sorted by fee rate. The UI is the gold standard. Lightning Network statistics are first-class. Self-hostable on your own Bitcoin node via the project's Docker image, included by default in Umbrel and Start9.
Strengths:
- Best mempool visualization in the category.
- Real-time fee estimates that wallets actually trust.
- Lightning Network coverage: nodes, channels, capacity stats.
- Open source under MIT license.
- Tor onion address available for the public instance.
- Full text search by address, transaction ID, or block height.
Weaknesses:
- Public instance can be slow during congestion peaks.
- UI density can overwhelm first-time users.
Blockstream.info
Blockstream's blockstream.info is the older grand-daddy of the modern explorer category. Cleaner UI than mempool.space, less mempool focus, more "look up an address" focus. Open source under MIT (esplora is the codebase). Tor onion mirror available.
Strengths:
- Cleanest UI for address lookups.
- Liquid sidechain support.
- Stable, fast, well-funded.
Weaknesses:
- Mempool data less granular than mempool.space.
- No Lightning Network coverage.
Self-hosted options
If you run your own Bitcoin node, you can run your own explorer for full privacy. Three credible options:
- Mempool.space self-hosted — same codebase as the public site, runs alongside your node. Comes pre-configured in Umbrel, Start9, MyNode, and RaspiBlitz.
- BTC RPC Explorer — lighter-weight, written in Node.js, queries your node directly via RPC. Simpler than mempool.space; faster for low-resource hardware.
- Esplora (the codebase Blockstream.info runs on) — heavier resource requirements but the most feature-complete self-host option.
To run any of these you need a fully synced Bitcoin Core node (about 700GB pruned, 1TB+ unpruned). The Raspberry Pi 5 (8GB) with a Samsung T7 SSD (1TB) works fine for a single-user node.
Other notable explorers
- Bitfeed.live — the original "live mempool visualization" project that influenced mempool.space. Still maintained.
- BTCScan — a privacy-focused explorer modeled on the Etherscan UI but for Bitcoin. Less mempool focus, more transaction-graph clarity.
- OXT — for forensic and chain-analysis style queries. Much heavier; useful for tracking complex transaction graphs.
- Chainflyer — beautiful 3D visualization of the chain. More art project than tool but worth seeing once.
The privacy trade-off, plainly
Every time you look up an address on a public explorer, the operator sees:
- Your IP address (and approximate location).
- The exact address you searched.
- The time of the query.
- What other addresses you've queried in the same session.
For casual one-off lookups (checking that a payment confirmed), this is fine. For repeated lookups of your own addresses — which is what most Bitcoin holders end up doing — you're handing your address-watching pattern to a third party. They can correlate it with the addresses you actually own.
Three mitigations, ordered by effectiveness:
- Don't look up your own addresses on public explorers at all. Use your wallet's built-in transaction view, which queries via your wallet's own infrastructure (or your own node if Sparrow/Specter is configured to do so).
- Use Tor when querying public explorers. mempool.space and Blockstream.info both have onion addresses.
- Run your own explorer. The complete fix. mempool.space self-hosted on Umbrel is a one-click install.
Quick picks
"I'm a normal user who looks at the blockchain occasionally." Use mempool.space. Bookmark it. Switch to the .onion address if you're privacy-conscious.
"I want to check if a payment confirmed." Use your wallet's transaction view. If you must use an explorer, use Blockstream.info — fastest for single-address lookups.
"I want to estimate fees right now." mempool.space, no contest. The fee histogram is the best in the category.
"I run my own node." Self-host mempool.space (the public-instance experience, on your own hardware). Umbrel and Start9 both make this a one-click install.
"I want forensic-grade transaction tracing." OXT for visual graph analysis. For automated work, point Sparrow or Specter at your own node and use the wallet's coin control + transaction tree.
Related on BTCLinks
Frequently asked questions
What is a Bitcoin block explorer?
A block explorer is a website or app that shows the contents of the Bitcoin blockchain in a human-readable format. You can look up any transaction, address, or block. Underneath, every explorer is a UI on top of a Bitcoin Core node plus an indexing layer.
Which Bitcoin block explorer is best?
For most users: mempool.space — open source, self-hostable, best mempool visualization, full Lightning Network coverage. For pure address lookups: Blockstream.info. For self-hosted node owners: BTC RPC Explorer or your own mempool.space instance.
Do block explorers see what I look up?
Yes. When you query an address or transaction on a third-party explorer, that operator sees your query, your IP, and the address you care about. For privacy-sensitive lookups, run your own explorer.
Why would I run my own block explorer?
Three reasons: privacy (no third party sees what you look up), accuracy (you trust your own node), and uptime (no rate-limiting). Umbrel and Start9 both bundle mempool.space as a one-click app.
Sources
- mempool/mempool on GitHub — the open-source mempool.space codebase.
- Blockstream/esplora on GitHub — the open-source codebase behind blockstream.info.
- janoside/btc-rpc-explorer on GitHub — lightweight self-hosted explorer.
- bitcoin/bitcoin on GitHub — Bitcoin Core itself, the reference node implementation underneath every explorer.
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