---
title: "Fenster — App Overview"
url: https://marlvel.ai/apps/fenster
category: Health & Fitness
developer: Rajesh Budhiraja
platforms: ios, android
rating: N/A (0 ratings)
pricing: freemium
report_level: overview
generated: 2026-05-05
last_verified: "2026-05-05T07:28:45.713Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** Fenster differentiates itself by prioritizing user privacy and local data storage in a market typically dominated by cloud-synced health apps.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Health & Fitness |
| Rating | N/A ★ (0) |
| Pricing | freemium |
| Platforms | iOS, Android |
| Latest Version (iOS) | 1.0 |
| Latest Version (Android) | 2.1 |
| Developer | Rajesh Budhiraja |

<!-- SECTION: Summary -->
## What is Fenster?

Fenster is a privacy-focused fasting tracker that allows users to monitor fasting windows and physiological stages without requiring account registration. The app emphasizes local data storage and provides a streamlined interface for logging sessions and tracking progress over time.

<!-- SECTION: Key Features -->
## Key Features

- **Fasting Timers**: Supports multiple fasting windows including 16:8, 12:12, 14:10, 18:6, 20:4, and custom intervals.
- **Progress Tracking**: Visualizes fasting stages such as fat burn and autophagy alongside a history log with calendar and session cards.
- **Local Data Privacy**: Operates without cloud accounts, ensuring all user data remains stored locally on the device.
- **Notification System**: Provides daily reminders to start fasts, with optional milestone and follow-up notifications available via Premium.

<!-- SECTION: Target Audience -->
## Who is it for?

Individuals seeking a simple, privacy-conscious tool to manage intermittent fasting schedules.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/fenster/id6758405640?uo=4)
- [Google Play](https://play.google.com/store/apps/details?id=de.portafenster.tracking.app&hl=en&gl=us)
- [Full Intelligence Report](https://marlvel.ai/apps/fenster)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/fenster).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*