---
title: "KARL Business Day Calculator — App Overview"
url: https://marlvel.ai/apps/karl-business-day-calculator
category: Productivity
developer: Janosch Zimmer
platforms: ios
rating: N/A (0 ratings)
pricing: free
report_level: overview
generated: 2026-05-05
last_verified: "2026-05-05T13:48:04.946Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** KARL provides a specialized, audit-ready solution for professionals needing to calculate and document complex business and legal deadlines.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Productivity |
| Rating | N/A ★ (0) |
| Pricing | free |
| Platforms | iOS |
| Latest Version (iOS) | 2.0 |
| Developer | Janosch Zimmer |

<!-- SECTION: Summary -->
## What is KARL Business Day Calculator?

KARL Business Day Calculator is a specialized productivity tool designed to calculate and document business days and legal deadlines. It supports complex financial and legal workflows by offering market-standard roll conventions and automated audit trails for date-based calculations.

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

- **Business Day Calculator (T+N)**: Calculates dates by adding or subtracting business days while automatically skipping non-business days.
- **Roll Conventions**: Adjusts dates based on market standards including Following, Preceding, and Modified Following/Preceding.
- **Legal Deadline Calculation**: Computes statutory deadlines under German law (BGB) using specific start rules and period types.
- **Audit Trace with Proof**: Provides tabular documentation for each calculated date to ensure a verifiable audit trail.

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

Legal, banking, and finance professionals requiring precise deadline management and documentation.

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

- [App Store](https://apps.apple.com/us/app/karl-business-day-calculator/id6759219225?uo=4)
- [Full Intelligence Report](https://marlvel.ai/apps/karl-business-day-calculator)

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