v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 14, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Registrant Name CROWN PROPTECH ACQUISITIONS  
Amendment Flag false  
Entity Central Index Key 0001827899  
Entity Incorporation, State or Country Code E9  
Entity File Number 001-40017  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 40 West 57th Street  
Entity Address, Address Line Two 29th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10019  
City Area Code +1(212)  
Local Phone Number 796-4796  
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol CPTKW  
Security Exchange Name NONE  
Entity Interactive Data Current No  
Entity Current Reporting Status No  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company true  
Class A Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   483,822
Class B Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   6,900,000