Sponsoring is an independent, completely free database, with no ads. However, publishing the website is not free. The database grows every year and therefore the costs are increasing. On this page we will keep you informed about the costs and offer possibilities to contribute to the continuity and independence of

Total costs website per year:
2023: € 992,38
2022: € 794,40
2021: € 828,02
2020: € 785,57
2019: € 704,97
2018: € 655,17
2017: € 314,30
2016: € 287,71

Possibilities to contribute
One way to support us is to buy a T-shirt. The shirts are made of light grey, pure organic cotton with a grey print on the front and a blue print on the back. All ‘profits’ will be used to pay for the costs of If you want to order a shirt, send an email to We don't have a webshop so you will be asked to transfer €30 (plus shipping costs, €8 for most European countries) to our Dutch bank account.

Nouveaux T-shirts!

Buying packages within the 5+6 7+8 app is a great way to help you find the problems you want to do and to sponsor All profits will be used to pay for the costs of The app is a supplement to the 5+6 and 7+8 guides and the yield of the books also ensures the maintenance of

The gîte BLOASIS is our first sponsor. Check the news section on their website to see what they do for us (and for you!).

Monk is our second sponsor. These Dutch and Belgian bouldering gyms support our work with a generous annual contribution.

Our third sponsor prefers to remain anonymous. It also supports us with a generous annual amount.

Six users of have transferred us a one-off amount and one user supports us with a monthly contribution as a thank you for our work. T-shirt sales:
Total yield 2023: € 1276,57
Total yield 2022: € 1470,00
Total yield 2021: € 1125,12 (supported by Victor Burger)

If you would like to support us too, please contact us at