diff --git a/macho/architecture.test.ts b/macho/architecture.test.ts
index c33f499..655f5bf 100644
--- a/macho/architecture.test.ts
+++ b/macho/architecture.test.ts
@@ -1,4 +1,11 @@
 import { assertEquals } from '@std/assert';
+import {
+	CPU_SUBTYPE_LIB64,
+	CPU_SUBTYPE_MULTIPLE,
+	CPU_SUBTYPE_X86_64_H,
+	CPU_TYPE_I386,
+	CPU_TYPE_X86_64,
+} from '../const.ts';
 import { FatArch } from '../mach/fatarch.ts';
 import { FatArch64 } from '../mach/fatarch64.ts';
 import { Architecture } from './architecture.ts';
@@ -43,3 +50,66 @@ Deno.test('constructor(archInFile: FatArch64)', () => {
 	assertEquals(a.cpuSubType(), 0x456789);
 	assertEquals(a.cpuSubtypeFull(), 0x23456789);
 });
+
+Deno.test('bool', () => {
+	assertEquals(new Architecture(0, 0).bool(), false);
+	assertEquals(new Architecture(0, 1).bool(), false);
+	assertEquals(new Architecture(1, 0).bool(), true);
+	assertEquals(new Architecture(1, 1).bool(), true);
+});
+
+Deno.test('equals', () => {
+	assertEquals(new Architecture(1, 2).equals(new Architecture(1, 2)), true);
+	assertEquals(new Architecture(1, 2).equals(new Architecture(1, 3)), false);
+	assertEquals(new Architecture(2, 2).equals(new Architecture(1, 2)), false);
+});
+
+Deno.test('lessThan', () => {
+	assertEquals(
+		new Architecture(1, 2).lessThan(new Architecture(2, 2)),
+		true,
+	);
+	assertEquals(
+		new Architecture(1, 2).lessThan(new Architecture(1, 3)),
+		true,
+	);
+	assertEquals(
+		new Architecture(1, 2).lessThan(new Architecture(1, 2)),
+		false,
+	);
+	assertEquals(
+		new Architecture(2, 2).lessThan(new Architecture(1, 2)),
+		false,
+	);
+	assertEquals(
+		new Architecture(1, 2).lessThan(new Architecture(1, 2)),
+		false,
+	);
+});
+
+Deno.test('matches', () => {
+	{
+		const arch = new Architecture(CPU_TYPE_X86_64, CPU_SUBTYPE_MULTIPLE);
+		const tmpl = new Architecture(CPU_TYPE_I386, CPU_SUBTYPE_MULTIPLE);
+		assertEquals(arch.matches(tmpl), false);
+	}
+	{
+		const arch = new Architecture(CPU_TYPE_X86_64, CPU_SUBTYPE_X86_64_H);
+		const tmpl = new Architecture(CPU_TYPE_X86_64, CPU_SUBTYPE_MULTIPLE);
+		assertEquals(arch.matches(tmpl), true);
+
+		// Not symmetric.
+		assertEquals(tmpl.matches(arch), false);
+	}
+	{
+		const arch = new Architecture(
+			CPU_TYPE_X86_64,
+			CPU_SUBTYPE_X86_64_H | CPU_SUBTYPE_LIB64,
+		);
+		const tmpl = new Architecture(
+			CPU_TYPE_X86_64,
+			CPU_SUBTYPE_X86_64_H,
+		);
+		assertEquals(arch.matches(tmpl), true);
+	}
+});
diff --git a/macho/architecture.ts b/macho/architecture.ts
index abccac6..d7adfe4 100644
--- a/macho/architecture.ts
+++ b/macho/architecture.ts
@@ -87,4 +87,51 @@ export class Architecture {
 	public cpuSubtypeFull(): number {
 		return this.second;
 	}
+
+	/**
+	 * Is architecture valid.
+	 *
+	 * @returns Is valid.
+	 */
+	public bool(): boolean {
+		return !!this.first;
+	}
+
+	/**
+	 * If architectures are equal.
+	 *
+	 * @param arch Architecture to compare.
+	 * @returns Is equal.
+	 */
+	public equals(arch: Const<Architecture>): boolean {
+		return this.first === arch.first && this.second === arch.second;
+	}
+
+	/**
+	 * If architecture is less than another.
+	 *
+	 * @param arch Architecture to compare.
+	 * @returns Is less than.
+	 */
+	public lessThan(arch: Const<Architecture>): boolean {
+		const x = this.first;
+		const y = arch.first;
+		return x < y || (!(y < x) && this.second < arch.second);
+	}
+
+	/**
+	 * Check is architecture matches template, asymmetric comparison.
+	 *
+	 * @param templ Template architecture.
+	 * @returns Matches template.
+	 */
+	public matches(templ: Const<Architecture>): boolean {
+		if (this.first !== templ.first) {
+			return false;
+		}
+		if (templ.second === CPU_SUBTYPE_MULTIPLE) {
+			return true;
+		}
+		return !((this.second ^ templ.second) & ~CPU_SUBTYPE_MASK);
+	}
 }