Never lose a great idea.
Ideas arrive at inconvenient moments. Most note apps demand an account, sync and storage before a thought is even saved.
SPARK lets you open, speak or type, and keeps the thought on your phone. Later, it resurfaces the ones you forgot.
- Role
- Product design, Android development, launch site
- Platform
- Android APK
- Storage
- Local SQLite, on device
- Status
- Live, v1.0, 2026

Real app screen · SPARK v1.0
Voice sparks
Record a thought, choose the recording quality, add optional on-device transcription, or keep it audio-only.
Resurfacing
Forgotten ideas come back with one question: “Still relevant?”
Four stages
Active → Developing → Built → Archived
Portable vault
Export as JSON or Markdown, or a full ZIP backup with audio. A storage indicator shows what’s on the device.
Private by default: no account, no cloud.
| Feature | SPARK | Google Keep | Notion |
|---|---|---|---|
| No account | ✓ | × | × |
| Fully offline | 100% | Partial | Limited |
| Data on device | ✓ | Cloud sync | Cloud |
| Idea resurfacing | ✓ | × | × |
| Footprint | ≈5.2 MB | Medium | 100 MB+ |