diff --git a/src/index.ts b/src/index.ts
index 00665eee..1529803f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -43,6 +43,7 @@ export {
   getTargetScrollBarSize,
 } from './getScrollBarSize';
 export { default as isEqual } from './isEqual';
+export { isNonNullable, isReactRenderable } from './is';
 export { default as isMobile } from './isMobile';
 export { default as omit } from './omit';
 export { default as pickAttrs } from './pickAttrs';
diff --git a/src/is.ts b/src/is.ts
new file mode 100644
index 00000000..eae4d3d7
--- /dev/null
+++ b/src/is.ts
@@ -0,0 +1,21 @@
+/**
+ * Check if a value is neither `null` nor `undefined`.
+ */
+export function isNonNullable<T>(value: T): value is NonNullable<T> {
+  return value !== undefined && value !== null;
+}
+
+/**
+ * Check whether a value should be treated as renderable content.
+ *
+ * Returns `false` only for `null`, `undefined`, `false`, and `''`; all other
+ * values, including `0` and `true`, are treated as renderable.
+ *
+ * This is a compatibility-oriented presence check, not a complete React node
+ * validator.
+ */
+export function isReactRenderable<T>(
+  value: T,
+): value is Exclude<NonNullable<T>, false | ''> {
+  return isNonNullable(value) && value !== false && value !== '';
+}
diff --git a/tests/is.test.tsx b/tests/is.test.tsx
new file mode 100644
index 00000000..e636b9eb
--- /dev/null
+++ b/tests/is.test.tsx
@@ -0,0 +1,32 @@
+import { isNonNullable, isReactRenderable } from '../src';
+
+describe('is', () => {
+  describe('isNonNullable', () => {
+    it.each([undefined, null])('returns false for nullable value %p', value => {
+      expect(isNonNullable(value)).toBeFalsy();
+    });
+
+    it.each([false, '', 0, 'text', <span key="node" />])(
+      'returns true for non-nullable value %p',
+      value => {
+        expect(isNonNullable(value)).toBeTruthy();
+      },
+    );
+  });
+
+  describe('isReactRenderable', () => {
+    it.each([undefined, null, false, ''])(
+      'returns false for non-renderable value %p',
+      value => {
+        expect(isReactRenderable(value)).toBeFalsy();
+      },
+    );
+
+    it.each([0, true, 'text', <span key="node" />])(
+      'returns true for renderable value %p',
+      value => {
+        expect(isReactRenderable(value)).toBeTruthy();
+      },
+    );
+  });
+});