# Formulus — Client for Synkronus

> Client for Synkronus (iPhone/iPad app by Chrsitian Stærk.)

- Source: https://appshunter.io/ios/app/formulus/id6798318215 (this page in markdown: same URL + `.md`)
- Developer: [Chrsitian Stærk](https://appshunter.io/developer/1792836087)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 36 MB
- Languages: American English
- Released: 2026-08-25
- Data updated: 2026-10-09

## What is Formulus?

Formulus is the mobile data collection client of the Open Data Ensemble (ODE) platform.

It allows organizations, research teams, and public sector institutions to build their own bespoke data collection applications based on structured forms defined using the JSONForms specification.

Forms and application logic are defined externally, meaning the same Formulus app can host many different data collection projects without requiring app updates.

Key features include:

• Flexible form-based data collection using JSONForms
• Offline-first operation for use in the field
• Secure bi-directional synchronization with an ODE Synkronus server
• Support for complex data structures and validation
• Designed for long-term maintainability and open standards

Formulus is particularly suited for environments where reliable data collection is needed under challenging conditions, such as:

• field research
• public health surveillance
• environmental monitoring
• humanitarian and development projects
• decentralized data collection initiatives

The app requires access to an ODE Synkronus server for synchronization and project management. Organizations typically run their own Synkronus server to host forms, manage users, and collect submitted data.

If you do not yet have access to a Synkronus server but would like to explore the application, a public demonstration environment may be available. See the project website for details.

Formulus is part of the Open Data Ensemble ecosystem, an open-source initiative focused on building interoperable tools for decentralized, standards-based data collection.

Source code and documentation:
https://opendataensemble.org

## Is Formulus safe?

Not enough ratings yet to assess Formulus.

## Is Formulus legit?

Formulus has limited verification signals. The AppsHunter Legitimacy Score for Formulus is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.3.1 — 2026-08-27

Descriptions and icons have been updated.
Better performance and memory handling in Formulus.
Packages and build tooling updated.

### 1.0 — 2026-08-25

No release notes.

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## More apps by Chrsitian Stærk

- [Strong Tabata and HIIT timer](https://appshunter.io/ios/app/strong-tabata-and-hiit-timer/id6741066142)

All apps by Chrsitian Stærk: https://appshunter.io/developer/1792836087

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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 2026-10-09.*