diff --git a/CLAUDE.md b/CLAUDE.md
index 59678e4..e2e6dd3 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -15,4 +15,7 @@ Instructions for Claude Code when working on this project.
## Current Status
-refer `docs/dev-plan.md` for the current status.
+**Completed**: Phases 0-8 (All core functionality including storage monitoring)
+**Next**: Phase 9 - Export/Import
+
+See `docs/dev-plan.md` for complete roadmap and technical details.
diff --git a/docs/dev-plan.md b/docs/dev-plan.md
index 07e48de..a3cc675 100644
--- a/docs/dev-plan.md
+++ b/docs/dev-plan.md
@@ -156,16 +156,17 @@ Astrolabe is a focused tool for managing, editing, and previewing Vega-Lite visu
---
-### **Phase 8: Storage Monitoring**
+### **Phase 8: Storage Monitoring** ✅ **COMPLETE**
**Goal**: Show storage usage and limits
-- [ ] Calculate total localStorage usage
-- [ ] Display as progress bar or text (e.g., "2.3 MB / ~5 MB")
-- [ ] Show individual snippet sizes in list
-- [ ] Add warning indicator when approaching 80% capacity
-- [ ] Display draft vs published size differences
-
-**Deliverable**: User can see storage consumption
+**Deliverables**:
+- Storage usage calculation using Blob API for accurate byte counting
+- Progress bar display showing usage vs 5MB limit (e.g., "2.3 MB / 5 MB")
+- Visual warning states: green (normal), orange (90%+ warning), red (95%+ critical)
+- Storage monitor positioned at bottom of snippet panel below metadata
+- Automatic updates after every save operation
+- Alert dialog when localStorage quota is exceeded
+- Flexbox layout ensuring monitor stays at panel bottom with scrollable snippet list
---
@@ -304,15 +305,15 @@ Astrolabe is a focused tool for managing, editing, and previewing Vega-Lite visu
## Current Status
-**Completed**: Phases 0-7 (Storage, UI, editor, rendering, persistence, CRUD, organization, draft/published workflow)
-**Active**: Phase 8 - Storage Monitoring
+**Completed**: Phases 0-8 (Storage, UI, editor, rendering, persistence, CRUD, organization, draft/published workflow, storage monitoring)
+**Next**: Phase 9 - Export/Import
**See**: `CLAUDE.md` for concise current state summary
---
## Implemented Features
-### Core Capabilities (Phases 0-7)
+### Core Capabilities (Phases 0-8)
- Three-panel resizable layout with memory and persistence
- Monaco Editor v0.47.0 with Vega-Lite v5 schema validation
- Live Vega-Lite rendering with debounced updates and error display
@@ -324,6 +325,7 @@ Astrolabe is a focused tool for managing, editing, and previewing Vega-Lite visu
- Draft/Published workflow with version control
- Status indicator lights (green/yellow) showing draft state
- Context-aware Publish/Revert buttons with color coding
+- Storage monitoring with visual progress bar and warning states
- Retro Windows 2000 aesthetic throughout
### Technical Implementation
@@ -334,4 +336,6 @@ Astrolabe is a focused tool for managing, editing, and previewing Vega-Lite visu
- **Debouncing**: 1.5s render, 1s auto-save, 300ms search
- **AMD Resolution**: Temporary `window.define` disabling for Vega library loading
- **Panel Memory**: localStorage persistence for sizes and visibility across sessions
-- **Data Model**: Phase 0 schema with `spec` (published) and `draftSpec` (working) fields
\ No newline at end of file
+- **Data Model**: Phase 0 schema with `spec` (published) and `draftSpec` (working) fields
+- **Storage Calculation**: Blob API for accurate byte counting of snippet data
+- **Flexbox Layout**: Scrollable snippet list with fixed metadata and storage monitor at bottom
\ No newline at end of file
diff --git a/index.html b/index.html
index 1e059e3..4b77815 100644
--- a/index.html
+++ b/index.html
@@ -94,6 +94,15 @@
+