diff --git a/tools/ui/src/lib/constants/index.ts b/tools/ui/src/lib/constants/index.ts
index c2749a95eb..95a9d9bbec 100644
--- a/tools/ui/src/lib/constants/index.ts
+++ b/tools/ui/src/lib/constants/index.ts
@@ -46,6 +46,7 @@ export * from './model-id.constants';
 export * from './model-loading.constants';
 export * from './models-discover.constants';
 export * from './models-discover-download.constants';
+export * from './model-compatibility.constants';
 export * from './huggingface.constants';
 export * from './precision.constants';
 export * from './pwa.constants';
diff --git a/tools/ui/src/lib/constants/model-compatibility.constants.ts b/tools/ui/src/lib/constants/model-compatibility.constants.ts
new file mode 100644
index 0000000000..21ab78ae2b
--- /dev/null
+++ b/tools/ui/src/lib/constants/model-compatibility.constants.ts
@@ -0,0 +1,32 @@
+/**
+ * Model memory-fit constants.
+ *
+ * Mirrors the app's compatibility check (Model+Compatibility.swift):
+ *   budget      = RAM x RAM_BUDGET_RATIO - RAM_OVERHEAD_MB
+ *   weightBytes = fileBytes x QUANT_WEIGHT
+ * a file fits when weightBytes <= budget. Kept here so the estimation util and
+ * any caller share one source.
+ */
+// LLAMA-APP-REUSE: hardware compatibility budget (mirrors Model+Compatibility.swift)
+
+/** Bytes in one mebibyte (MiB), used to convert a file size to MB. */
+export const MIB_BYTES = 1_048_576;
+
+/** MB in one GB. */
+export const MB_PER_GB = 1024;
+
+/** Overhead multiplier applied to the file size when estimating weight memory. */
+export const QUANT_WEIGHT = 1.05;
+
+/** Share of RAM the app allows the model to occupy. */
+export const RAM_BUDGET_RATIO = 0.75;
+
+/** Fixed RAM overhead (MB) reserved for the system and KV cache. */
+export const RAM_OVERHEAD_MB = 2048;
+
+/**
+ * Memory tiers Macs ship with (GB). Tiers past 512 extrapolate Apple's step
+ * pattern so builds too big for any current Mac still show an honest
+ * requirement instead of silently omitting the line.
+ */
+export const MAC_MEM_TIERS = [8, 16, 24, 32, 48, 64, 96, 128, 192, 256, 512, 768, 1024];
diff --git a/tools/ui/src/lib/utils/model-compatibility.ts b/tools/ui/src/lib/utils/model-compatibility.ts
index 164be26f23..18063b1976 100644
--- a/tools/ui/src/lib/utils/model-compatibility.ts
+++ b/tools/ui/src/lib/utils/model-compatibility.ts
@@ -9,22 +9,14 @@
  * device-specific budgets are deliberately ignored - callers present the
  * requirement and let the user judge.
  */
-// LLAMA-APP-REUSE: hardware compatibility estimation
-
-const MIB_BYTES = 1_048_576;
-const MB_PER_GB = 1024;
-/** Overhead multiplier applied to the file size when estimating weight memory. */
-const QUANT_WEIGHT = 1.05;
-/** Share of RAM the app allows the model to occupy. */
-const RAM_BUDGET_RATIO = 0.75;
-/** Fixed RAM overhead (MB) reserved for the system and KV cache. */
-const RAM_OVERHEAD_MB = 2048;
-/**
- * Memory tiers Macs ship with (GB). Tiers past 512 extrapolate Apple's step
- * pattern so builds too big for any current Mac still show an honest
- * requirement instead of silently omitting the line.
- */
-const MAC_MEM_TIERS = [8, 16, 24, 32, 48, 64, 96, 128, 192, 256, 512, 768, 1024];
+import {
+	MAC_MEM_TIERS,
+	MB_PER_GB,
+	MIB_BYTES,
+	QUANT_WEIGHT,
+	RAM_BUDGET_RATIO,
+	RAM_OVERHEAD_MB
+} from '$lib/constants';
 
 /**
  * Estimated runtime memory (bytes) for a model of the given file size: