# Stefan Kalteis

> Stefan Kalteis is a seed investor backing Software, Travel and Tourism. See 8 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Total investments: 8
- Last investment: Nov 2025
- Lead investor: 13%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/stefankalteis/
- Website: http://www.payolution.com

Stefan Kalteis is a seed investor focused on Software and Travel. Stefan Kalteis

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $300k–$6.6M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Software | 2 | 25% |
| Travel | 1 | 13% |
| Tourism | 1 | 13% |
| Payments | 1 | 13% |
| Analytics | 1 | 13% |

17 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 5 | 63% |
| Pre-Seed | 1 | 13% |

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Germany | 2 | 25% |
| Turkey | 1 | 13% |
| Austria | 1 | 13% |
| United Kingdom | 1 | 13% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Donnerstag.ai | Donnerstag.ai is an AI-powered centralized receivables management platform for suppliers that automates the reconciliation of services, credit notes, and payments. It aggregates data from various sources like ERP, EDI, Excel, and PDF, performs position-level matching to detect discrepancies, and provides real-time transparency on open items andcash flow. The system reduces manual work by automating recurring financial processes and integrates seamlessly with major ERP and accounting systems. | $4.6M | Seed | Nov 20, 2025 |  |
| Fraud0 | Fraud0 is a software that renders uncontaminated analytics, automated non-human traffic, fraud and advertising detection solutions. | $6.6M | Seed | Aug 30, 2023 |  |
| Yolda | Logistic operations still largely run on paper. It is almost impossible to track the vast majority of loads, receive delivery documents or measure how successful the operation is. Yolda.com is changing this with a strategic operating model that combines advanced tech and data analytics, logistics infrastructure, and hands-on supply chain expertise.Yolda.com combines the quality of cargo transportation with the diversity of haulier and the integrated service model of 3PL companies and offers a high-quality logistics experience by focusing on its customers. Yolda.com’s marketplace solution encompasses many local forwarders and logistics companies, enabling SMEs and corporate enterprises to receive an instant quote for multiple shipment requests on a single platform. Companies can also track their shipments via Yolda.com's intelligent control panel and measure their logistics operations performance with detailed reporting services. | $5M | Seed | Dec 13, 2021 |  |
| Yolda | Logistic operations still largely run on paper. It is almost impossible to track the vast majority of loads, receive delivery documents or measure how successful the operation is. Yolda.com is changing this with a strategic operating model that combines advanced tech and data analytics, logistics infrastructure, and hands-on supply chain expertise.Yolda.com combines the quality of cargo transportation with the diversity of haulier and the integrated service model of 3PL companies and offers a high-quality logistics experience by focusing on its customers. Yolda.com’s marketplace solution encompasses many local forwarders and logistics companies, enabling SMEs and corporate enterprises to receive an instant quote for multiple shipment requests on a single platform. Companies can also track their shipments via Yolda.com's intelligent control panel and measure their logistics operations performance with detailed reporting services. | $1.9M | Seed | Jun 10, 2021 |  |
| Yolda | Logistic operations still largely run on paper. It is almost impossible to track the vast majority of loads, receive delivery documents or measure how successful the operation is. Yolda.com is changing this with a strategic operating model that combines advanced tech and data analytics, logistics infrastructure, and hands-on supply chain expertise.Yolda.com combines the quality of cargo transportation with the diversity of haulier and the integrated service model of 3PL companies and offers a high-quality logistics experience by focusing on its customers. Yolda.com’s marketplace solution encompasses many local forwarders and logistics companies, enabling SMEs and corporate enterprises to receive an instant quote for multiple shipment requests on a single platform. Companies can also track their shipments via Yolda.com's intelligent control panel and measure their logistics operations performance with detailed reporting services. | $830K | Pre-Seed | May 22, 2020 |  |
| checkyeti | CheckYeti is the largest online platform to book activities in 1000+ mountain and beach destinations across Europe - including skiing & snowboarding, rafting & canyoning, mountain biking, paragliding & ballooning, diving & surfing, jet skiing, boat trips and many more. With 12 000+ offers in 16 countries, CheckYeti enablesholidaymakers and outdoor enthusiasts to experience summer and winter activities with their ideal guide. | $2M | Seed | Jul 01, 2017 |  |
| Swelly | Swelly connects businesses and brands with Gen Z opinions using a social voting platform and a consumer insights platform.Swelly helps people to make better decisions while providing hours of entertainment in a unique voting experience on iOS & Android as well as our Swelly bot for Messenger, Line, Viber, kik and Telegram: www.swelly.ai(http://www.swelly.ai/) Swelly for Business helps brands understand how Gen Z thinks. | $300K | Seed | Feb 02, 2016 |  |
| Swelly | Swelly connects businesses and brands with Gen Z opinions using a social voting platform and a consumer insights platform.Swelly helps people to make better decisions while providing hours of entertainment in a unique voting experience on iOS & Android as well as our Swelly bot for Messenger, Line, Viber, kik and Telegram: www.swelly.ai(http://www.swelly.ai/) Swelly for Business helps brands understand how Gen Z thinks. | $300K | Seed | Oct 16, 2015 |  |

8 of 8 investments shown.

## Co-investors
- [Collective Spark](https://shizune.co/investors/profile/collective-spark) — VC Fund, 3 deals together
- [Speedinvest](https://shizune.co/investors/profile/speedinvest) — VC Fund, 2 deals together
- [startup300](https://shizune.co/investors/profile/startup300) — VC Fund, 2 deals together
- [Crestone Venture Capital](https://shizune.co/investors/profile/crestone-venture-capital) — VC Fund, 1 deal together
- [LAUNCHub Ventures](https://shizune.co/investors/profile/launchub) — VC Fund, 1 deal together
- [Michael Grabner Media GmbH](https://shizune.co/investors/profile/michael-grabner-media-gmbh) — VC Fund, 1 deal together

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## FAQ

### What does Stefan Kalteis invest in?

Stefan Kalteis invests primarily in Software, Travel and Tourism startups, most often at Seed and Pre-Seed stage. Most of the 8 investments tracked by Shizune back companies in Germany. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Stefan Kalteis's check size?

Stefan Kalteis typically joins rounds of $300k–$6.6M at Seed. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Stefan Kalteis participates in.

### When did Stefan Kalteis last invest?

The most recent investment recorded for Stefan Kalteis closed in Nov 2025. Shizune tracks 8 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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