{
  "schema": "tesign-radar/item/1",
  "generated_at": "2026-09-17T01:56:13.055Z",
  "lang": "en",
  "slug": "lertaro",
  "url": "https://tesign.com/en/item/lertaro/",
  "alternates": {
    "ko": {
      "html": "https://tesign.com/item/lertaro/",
      "json": "https://tesign.com/item/lertaro/index.json",
      "markdown": "https://tesign.com/item/lertaro/index.md"
    },
    "en": {
      "html": "https://tesign.com/en/item/lertaro/",
      "json": "https://tesign.com/en/item/lertaro/index.json",
      "markdown": "https://tesign.com/en/item/lertaro/index.md"
    }
  },
  "name": "Lertaro",
  "use_label": "Instant file search for Windows users",
  "one_liner": "Windows search launcher reading the NTFS USN Journal and $MFT for near-instant file search",
  "text": {
    "why": "It folds what Everything and Listary each did — instant file search and a launcher — into one MIT-licensed open-source tool. Instead of walking directories it reads the NTFS USN Change Journal and $MFT directly, with a background service keeping the index in sync in real time. Native x64 and ARM64 (Windows on ARM) builds ship together, and an inline bar docks into Open/Save dialogs and file managers such as File Explorer and Total Commander.",
    "take": "What sets it apart for Everything users is the MIT licence, the .NET plugin SDK and the native ARM64 build.",
    "build": [
      "With the .NET 10 C# plugin SDK you can add an internal document store or wiki as a search provider and register frequent commands as aliases and actions; it is also compatible with Flow Launcher community plugins."
    ],
    "who": [
      {
        "role": "Windows power users",
        "situation": "a file search and launcher replacing Everything/Listary"
      },
      {
        "role": "Windows on ARM (Snapdragon) laptop users",
        "situation": "the native ARM64 build"
      },
      {
        "role": ".NET developers",
        "situation": "custom search providers and actions via the plugin SDK"
      }
    ],
    "start": [
      {
        "command": false,
        "text": "1. x64: download and run https://github.com/Lertaro/Lertaro/releases/latest/download/Lertaro-Setup.exe (recommended, supports the background service)"
      },
      {
        "command": false,
        "text": "2. ARM64: https://github.com/Lertaro/Lertaro/releases/latest/download/Lertaro-Setup-arm64.exe"
      },
      {
        "command": false,
        "text": "3. No install: unzip Lertaro-Portable.zip (ARM64: Lertaro-Portable-arm64.zip) and run"
      },
      {
        "command": false,
        "text": "4. Build from source on Windows 10/11 with the .NET 10 SDK: build_and_run.bat (x64 and ARM64 Release builds: make.bat)"
      }
    ],
    "caveat": [
      "Licence MIT. Windows 10/11 only (x64 and ARM64). Low-level indexing covers NTFS/ReFS; FAT32/exFAT is handled by monitoring. The installer runs a SYSTEM-level background service. The project started in August 2026 and its README warns to download only from official sources. Whether a separate .NET runtime install is required: [확인 필요]."
    ]
  },
  "cta": {
    "type": "install",
    "label": "INSTALL",
    "url": "https://lertaro.github.io/"
  },
  "ready": "install",
  "categories": [
    "productivity"
  ],
  "categories_confirmed": true,
  "tags": [
    "windows",
    "file-search",
    "launcher",
    "ntfs",
    "dotnet",
    "wpf"
  ],
  "platform": [
    "windows"
  ],
  "license": {
    "spdx": "MIT",
    "scope": "permissive",
    "scope_text": "Use, change and redistribute, commercially too. Keep the notice.",
    "url": "https://spdx.org/licenses/MIT.html",
    "note": null,
    "open_source": true
  },
  "language": "C#",
  "source_urls": {
    "canonical": "https://lertaro.github.io/",
    "github": "https://github.com/lertaro/lertaro",
    "huggingface": null,
    "app_store": null,
    "sightings": [
      {
        "source": "github",
        "url": "https://github.com/lertaro/lertaro",
        "posted_at": "2026-09-11T22:00:00.000Z",
        "hn_url": null
      }
    ]
  },
  "numbers": {
    "as_of": "2026-09-16T21:00:00.000Z",
    "stars": 555,
    "stars_unit": "GitHub stars",
    "stars_checked_at": "2026-09-15T19:35:23.619Z",
    "stars_observed_since_check": 2,
    "star_delta_24h": 2,
    "star_delta_7d": 14,
    "star_delta_30d": 14,
    "star_delta_unit": "GitHub stars gained in the window, GH Archive events summed to as_of",
    "spark_14d": [
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      4,
      8,
      null,
      null,
      null,
      2
    ],
    "hf_likes": null,
    "hf_likes_observed_at": null,
    "hn_points": null,
    "hn_points_observed_at": null,
    "store": null,
    "method": "Star total = the value last checked on GitHub (stars_checked_at) + increases observed via GH Archive since. The 24h · 7d · 30d gains are GH Archive hourly events summed to the reference time (as_of). No score of ours."
  },
  "ranks": null,
  "activity": {
    "pushed_at": "2026-09-15T08:09:12.000Z",
    "owner_type": "Organization",
    "open_issues": 2,
    "contributors": 3,
    "releases_count": 141,
    "latest_release": {
      "tag": "v5.6.7",
      "published_at": "2026-09-15T08:11:48.000Z",
      "prerelease": false
    },
    "checked_at": "2026-09-15T19:35:23.619Z",
    "core_checked_at": "2026-09-15T19:35:23.619Z"
  },
  "signals": [
    {
      "kind": "back",
      "label": "BACK CATALOG",
      "value": null
    }
  ],
  "images": {
    "og": "https://tesign.com/img/lertaro-9737ff54a1.png",
    "cover": "https://tesign.com/img/lertaro-9737ff54a1.png",
    "cover_width": 2400,
    "cover_height": 1260,
    "gallery": [
      "https://tesign.com/img/lertaro-9737ff54a1.png"
    ],
    "alt": "[확인 필요] No real product UI screenshot exists in the README or on the official site (lertaro.github.io) — the landing page's only image is the logo (logo.png). If a post-install capture of the actual search bar is possible, rewrite this alt to match it; otherwise fall back to a card (tier 4)",
    "tier": 1
  },
  "dates": {
    "first_seen_at": "2026-09-13T09:55:42.011Z",
    "source_created_at": "2026-08-06T05:00:57.000Z",
    "discovery_hours": 916.9125030555556,
    "launch_signal_at": "2026-09-11T22:00:00.000Z",
    "kept_at": "2026-09-14T19:27:43.682Z",
    "first_published_at": "2026-09-14T19:27:43.752Z",
    "updated_at": "2026-09-15T04:36:56.897Z",
    "ingestion_mode": "backfill"
  },
  "notes": [
    "This file was produced by the same build, from the same data, as the tesign.com item page. The text is editorial; the numbers are stored observations.",
    "null in the JSON means not observed — never zero. The Markdown writes [unconfirmed] for it.",
    "Star total = the value last checked on GitHub (stars_checked_at) + increases observed via GH Archive since. The 24h · 7d · 30d gains are GH Archive hourly events summed to the reference time (as_of). No score of ours.",
    "Reconstructed from archive data, not a live discovery.",
    "A summary, not legal advice."
  ]
}