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Lambda Client

The ultimate open-source Fabric utility mod. Experience autonomous building and a modern GUI designed for power users.

Y Open GUI
; Command Prefix

Features

Automation Engine

Lambda can autonomously build structures. We use Litematica as an interface, while our building engine handles the complex orchestration, block states, and rotations.

Unmatched Performance

Optimized rendering pipelines using batched rendering for superfast ESP. Modern frameworks ensure speed and responsiveness.

Sophisticated UX

Fine-tune over 1000+ settings with the clean Dear ImGui interface. Use Automation Profiles to switch complex configs instantly.

Safety & Tools

Built with Grim Anticheat compatibility in mind. Includes the new HighwayTools, rewritten to use the powerful build engine for efficient maintenance.

Version History

Download stable releases or try out the latest development snapshots.

Stable Releases

Development Snapshots

Join the Community

Get support, share configs, and stay updated with development.

Installation

  1. 1

    Minecraft ...

    Install the correct version via the official launcher.

  2. 2

    Fabric Loader

    Download and install the latest Fabric version.

  3. 3

    Get Lambda

    Download the .jar file from the buttons above.

  4. 4

    Launch

    Place in .minecraft/mods and start the game.

See More

Unable to reach the server. Latest` : ''; return `

v${getModVersion(ver)} ${latestBadge}
MC ${getMcVersion(ver)} ${btnText} `; } // Fetch and render releases and snapshots independently async function loadReleases() { const container = document.getElementById('release-list'); try { const relData = await fetchMavenMetadata('releases'); const releases = relData?.versions || []; if (releases.length === 0) { container.innerHTML = `
No releases published yet. Try a snapshot!`; return { latestRelease: null }; } let html = ''; [...releases].reverse().forEach((ver, i) => { const dlUrl = `${GITHUB_RELEASES}/download/${encodeURIComponent(ver)}/${ARTIFACT_ID}-${ver}.jar`; html += renderVersionCard(ver, dlUrl, 'Download JAR', 'release', i === 0); }); container.innerHTML = html; const latest = relData.latestRelease || releases[releases.length - 1]; return { latestRelease: latest }; } catch (e) { console.warn('Failed to fetch releases:', e); showError('release-list'); return { latestRelease: null }; } } async function loadSnapshots() { const container = document.getElementById('snapshot-list'); try { const snapData = await fetchMavenMetadata('snapshots'); const snapshots = snapData?.versions || []; if (snapshots.length === 0) { container.innerHTML = `
No snapshots found.`; return { latestSnapshot: null }; } const reversed = [...snapshots].reverse(); const MAX_EXACT_FETCHES = 3; const groupPath = GROUP_ID.replace(/\./g, '/'); // Fetch exact JARs for the latest few in parallel const exactJarUrls = await Promise.all( reversed.slice(0, MAX_EXACT_FETCHES).map(ver => fetchExactSnapshotJar(ver)) ); let html = ''; reversed.forEach((ver, i) => { let finalUrl, btnText; if (i < MAX_EXACT_FETCHES && exactJarUrls[i]) { finalUrl = exactJarUrls[i]; btnText = 'Download JAR'; } else { finalUrl = `${MAVEN_BASE}/#/snapshots/${groupPath}/${ARTIFACT_ID}/${ver}`; btnText = 'View Folder'; } html += renderVersionCard(ver, finalUrl, btnText, 'snapshot', i === 0); }); container.innerHTML = html; return { latestSnapshot: snapshots[snapshots.length - 1], latestSnapshotJar: exactJarUrls[0] }; } catch (e) { console.warn('Failed to fetch snapshots:', e); showError('snapshot-list'); return { latestSnapshot: null }; } } async function initVersions() { // Fire both columns independently so each shows its own skeletons -> content const [relResult, snapResult] = await Promise.all([ loadReleases(), loadSnapshots() ]); // Update hero/nav download buttons with the best available version const latestRelease = relResult.latestRelease; const latestSnapshot = snapResult.latestSnapshot; let isSnapshotFallback = false; let best; if (latestRelease) { best = latestRelease; } else if (latestSnapshot) { best = latestSnapshot; isSnapshotFallback = true; } else { // Both failed - fallback hero to GitHub document.querySelectorAll('.dynamic-mod-title').forEach(el => el.textContent = 'Check GitHub for latest'); document.querySelectorAll('.dynamic-dl-btn').forEach(el => el.href = GITHUB_RELEASES); document.querySelectorAll('.dynamic-mod-ver').forEach(el => el.textContent = ''); return; } const mcVer = getMcVersion(best); const modVer = getModVersion(best); let primaryDlUrl; if (isSnapshotFallback) { primaryDlUrl = snapResult.latestSnapshotJar || GITHUB_RELEASES; } else { primaryDlUrl = `${GITHUB_RELEASES}/download/${encodeURIComponent(best)}/${ARTIFACT_ID}-${best}.jar`; } document.querySelectorAll('.dynamic-dl-btn').forEach(el => el.href = primaryDlUrl); document.querySelectorAll('.dynamic-mc-ver').forEach(el => el.textContent = mcVer); document.querySelectorAll('.dynamic-mod-ver').forEach(el => el.textContent = isSnapshotFallback ? `v${modVer} (Snap)` : `v${modVer}`); document.querySelectorAll('.dynamic-mod-title').forEach(el => el.textContent = isSnapshotFallback ? `Latest Snapshot: ${modVer}` : `Release ${modVer}`); } initVersions(); });