# D4L Collect — Your contribution to research

> Your contribution to research (iPhone/iPad app by D4L data4life gGmbH.)

- Source: https://appshunter.io/ios/app/d4l-collect/id6738125273 (this page in markdown: same URL + `.md`)
- Developer: [D4L data4life gGmbH](https://appshunter.io/developer/1452884380)
- Category: Health & Fitness
- Price: Free
- Age rating: 17+
- Requires: iOS 16.6 · 47 MB
- Languages: American English, German (Germany)
- Released: 2025-10-15
- Data updated: 2026-09-02
- User reviews in markdown: https://appshunter.io/ios/app/d4l-collect/id6738125273/reviews.md

## What is D4L Collect?

Advance health research – easily and directly from your smartphone.
With the D4L Collect app, you can participate in digital studies anytime, anywhere.

Why join digital research studies?
- Take part in studies from anywhere with your smartphone or Wear OS smartwatch.
- No need to visit hospitals or clinics.
- Effortlessly collect health data in daily life.
- Enable evidence-based research by combining Patient-Reported Outcomes (PROs) with real-world data from wearables.
- Help researchers gain insights faster.

Your data is secure.
All information in the D4L Collect app is end-to-end encrypted and securely transmitted.

About Data4Life
Data4Life is a nonprofit digital health organization funded by the Hasso Plattner Foundation. We envision a world where health data is ready for research in the areas of public health and personalized medicine to improve prevention, diagnosis, and treatment.

Questions or feedback?
Contact us at we@data4life.help – we’re happy to assist!


## Version history (last 5 releases)

### 4.13.5 — 2026-08-21

This update brings the following improvements and fixes:
- Improved network diagnostics for connection errors
- Fixed an issue when starting an active recording while a passive recording is already running

### 4.13.4 — 2026-08-21

This update brings the following improvements and new features:
- Study update screen showing successful and failed updates
- Made scrollable views easier to recognize with more prominent visual scroll indicators
- Improved backend communication

### 4.13.3 — 2026-08-17

This update brings the following improvements and new features:
- Migrated from the Fitbit Web API to the Google Health API
- Added support for collecting sensor data from Oura Ring
- More granular scheduling options for study tasks, refined from days to hours
- Several bug fixes and performance improvements

### 4.12.1 — 2026-07-22

This update brings the following improvements and new features:
- Bluetooth permissions from participants are now only requested for studies that use sensor devices connecting using Bluetooth
- The summary screen for questionnaires is now skipped for questionnaires that have only one question
- Several bug fixes
- Various accessibility improvements

### 4.11.2 — 2026-07-04

This update brings the following improvements and new features:
- Improved search in large value lists by matching the beginning of any word.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-02.*