diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..90e7af499d68aa5e8dbd03d86fbad54cf9493ab3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/zig-*
+/.zigmod
+/deps.zig
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000000000000000000000000000000000000..58bea1710c156a3bb27231324d24a7b0e973b859
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,23 @@
+const std = @import("std");
+const deps = @import("./deps.zig");
+
+pub fn build(b: *std.build.Builder) void {
+    const target = b.standardTargetOptions(.{});
+
+    const mode = b.standardReleaseOptions();
+
+    const exe = b.addExecutable("zig-license-detect", "src/main.zig");
+    exe.setTarget(target);
+    exe.setBuildMode(mode);
+    deps.addAllTo(exe);
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+}
diff --git a/src/lib.zig b/src/lib.zig
new file mode 100644
index 0000000000000000000000000000000000000000..9779de7c6a7f011f8ae2d06b7c690e99f785771a
--- /dev/null
+++ b/src/lib.zig
@@ -0,0 +1,40 @@
+const std = @import("std");
+const licenses = @import("licenses-text");
+const leven = @import("leven");
+const fscheck = @import("fs-check");
+
+pub fn detect(alloc: *std.mem.Allocator, license_src: []const u8) ![]const u8 {
+    var min: ?usize = null;
+    var ind: ?usize = null;
+
+    for (licenses.spdx) |item, i| {
+        const distance = try leven.leven(u8, alloc, license_src, item[1], min);
+
+        if (min == null or distance < min.?) {
+            min = distance;
+            ind = i;
+        }
+    }
+
+    return licenses.spdx[ind.?][0];
+}
+
+pub fn detectInDir(alloc: *std.mem.Allocator, dir: std.fs.Dir) !?[]const u8 {
+    const lic_filename = (try testLicenseFile(dir, "LICENSE")) orelse
+        (try testLicenseFile(dir, "LICENSE.md")) orelse
+        null;
+
+    if (lic_filename == null) return null;
+    const f = try dir.openFile(lic_filename.?, .{});
+    defer f.close();
+    const b = try f.reader().readAllAlloc(alloc, 1024 * 1024);
+    defer alloc.free(b);
+    return try detect(alloc, b);
+}
+
+//
+//
+
+pub fn testLicenseFile(dir: std.fs.Dir, name: []const u8) !?[]const u8 {
+    return if (try fscheck.doesFileExist(dir, name)) name else null;
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000000000000000000000000000000000000..26516517f87ead80a2174854146f15df36d2804f
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,14 @@
+const std = @import("std");
+
+const detectlicense = @import("detect-license");
+
+pub fn main() !void {
+    std.log.info("All your codebase are belong to us.", .{});
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const alloc = &gpa.allocator;
+
+    const license = try detectlicense.detectInDir(alloc, std.fs.cwd());
+    std.debug.assert(std.mem.eql(u8, license.?, "MIT"));
+    std.log.info("OK", .{});
+}
diff --git a/zig.mod b/zig.mod
new file mode 100644
index 0000000000000000000000000000000000000000..35ec68ef1b8618a57b703a7e2245f188b9edc744
--- /dev/null
+++ b/zig.mod
@@ -0,0 +1,9 @@
+id: 2ovav391ivakpt5uh706c38jy7wddi6tqo5rmbdwig9ngkh7
+name: detect-license
+main: src/lib.zig
+license: MIT
+description: Given an input text guess which SPDX license it most likely is an instance of
+dependencies:
+  - src: git https://github.com/nektro/zig-licenses-text
+  - src: git https://github.com/nektro/zig-leven
+  - src: git https://github.com/nektro/zig-fs-check
diff --git a/zigmod.lock b/zigmod.lock
new file mode 100644
index 0000000000000000000000000000000000000000..df147ae26d18464e8b11caa1e2b2bf31a67997a8
--- /dev/null
+++ b/zigmod.lock
@@ -0,0 +1,5 @@
+2
+git https://github.com/nektro/zig-licenses-text commit-3c07c6e4eb0965dafd0b029c632f823631b3169c
+git https://github.com/nektro/zig-leven commit-8e9f827117ab1418578b692a2325754cc3ee692d
+git https://github.com/nektro/zig-range commit-890ca308fe09b3d5c866d5cfb3b3d7a95dbf939f
+git https://github.com/nektro/zig-fs-check commit-dcd8da90fcb8bf3c9887e713bf0ec072bc897dd5
diff --git a/zigmod.sum b/zigmod.sum
new file mode 100644
index 0000000000000000000000000000000000000000..edf3e4c83736365310392451f5192998d08447e0
--- /dev/null
+++ b/zigmod.sum
@@ -0,0 +1,4 @@
+blake3-20ceb9e27bdb93540e93006628fb94e0540f3f69a2304a8f73ad2989b8e27226 git/github.com/nektro/zig-licenses-text
+blake3-cf68eaad66254b89c8bc18578f58607aa2e87ae59dd5696c2394eb5a0a31c455 git/github.com/nektro/zig-leven
+blake3-09698753782139ab4877d08f33235170836f68b73e482b65cdee5637a6addf86 git/github.com/nektro/zig-range
+blake3-10460da714f5c8436d09c268795597b0b2686ffc1e789c9f50366c2cbb0e1ff3 git/github.com/nektro/zig-fs-check