The world's leading automated proofreading software

Our Company

Founded over 20 years ago on strong German quality principles and a sleeping hare’s quirkiness, Schlafender Hase has always worked closely with clients to create the best software solution in terms of both development and responding to actual needs in the field.

20 of the top Pharma

Our Mission

Our mission is to maintain our global leadership position in proofreading software and services for regulated industries. We strive to provide high quality, user friendly text and graphic verification software that meets and surpasses our customers’ specific needs and requirements.

Managing Directors

Frank Hessler - CEO of Schlafender Hase

Frank Hessler

Frank is Managing Director at Schlafender Hase. He co-founded the company in 2001 and was initially responsible for overseeing the development of the Text Verification Tool (TVT), in addition to future applications. Since 2017, Frank has held a broader role in the company, managing all aspects from software development to sales and marketing. Frank has been instrumental in the quick growth of Schlafender Hase, and is committed to bringing proofreading software to new industries and regions.

André Cerbe

André assumed the role of Managing Director at Schlafender Hase in 2023, leading our Sales, Marketing, and Finance departments, along with strategic initiatives. Bringing extensive experience in MedTech, Healthcare, and Private Equity, André has a proven track record of successfully developing and growing companies. His strategic vision has played a pivotal role in steering organizations towards sustained success.

André Cerbe - CoCEO of Schlafender Hase

Our Commitment to Our Customers


Respect for others opens the mind to understanding their needs. Purposefully cultivating respect makes our team sensitive to what makes our clients and their goals unique. It creates the space for us to learn, improve and deliver what our customers need to succeed.


By holding ourselves accountable to our clients, we cultivate our respect for their needs and goals. We stand by what we do; we are proud of positive results and eager to formulate and implement a plan when we see an opportunity for improvement.


By respecting our customers’ needs and goals, and by holding ourselves accountable, we create a quality product that meets our customers’ needs effectively, efficiently, reliably, simply and at a fair price. Our customers expect quality from us and so do we.

A True Partnership

“Our working relationship has been excellent…Schlafender Hase listens and understands our needs…
A true partnership has developed over the years.”

The Schlafender Hase Story


Schlafender Hase GmbH was founded on May 1, 2001, by Frank Hessler (Managing Director, Programming) and Willie Schnaubelt (Managing Director, Customer Service)


The name Schlafender Hase was initially an internal code name.
The name stuck.
It means “Sleeping Hare

tvt logo


The first version of TVT was developed in 2003 and went to market in 2004.


1st Global TVT Customer


The EMA chooses TVT

tvt logo


All major languages, Automated Annotations and QRD template support are all part of TVT by 2011. TVT has come to mean easy, efficient and accurate proofreading.



MHRA chooses TVT


Schlafender Hase Inc. opens its doors in Cambridge, Massachusetts, to better serve its North American customers.


Schlafender Hase adopts the unicode character U+1F407 (the rabbit) from the Unicode Consortium.
wieland Capital logo


Co-founder Willie Schnaubelt retired and Wieland Capital, a family office, headquartered in Munich, became a shareholder of the company. Frank Hessler continues to lead the company as Managing Director.

tvt logo


The newest version of TVT, TVT X, was introduced. TVT add-on modules are also made available which gives users access to specific functionality they may need.

tvt logos


TVT Artwork and TVT Spelling are available to use in conjunction with TVT. TVT Barcode is next to be released.

Our Partners

Debug Services

308, Techno IT Park,
New Link Road, Eksar, Near Eskay Resort,
Borivali (W), Mumbai 400 092, India

Advanced Graphic Systems

601-602, B-Wing, Trade World,
Kamala City, Senapati Benat Marg,
Lower Parel (W), Mumbai 400 013, India

A.M.D. Electronics

P.le Martesana, 10
20128 Milan, Italy

Agape-Life Support System Pte Ltd

7 Straits View, #05-01, Marina One East Tower, Singapore 018936 

Total Packaging Solution

87-21, Sindae-gil, Gonjiam-eup,Gwangju-si, Gyeonggi-do, Republic of Korea 12801

Our Offices

Schlafender Hase Headquarters

Westerbachstrasse 47
60489 Frankfurt am Main, Germany

Schlafender Hase Americas

245 First Street, Suite 1800-103
Cambridge, MA, USA 02142-1292