Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 07, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-38252
Entity Registrant Name	Spark Networks SE
Entity Incorporation, State or Country Code	2M
Entity Address, Address Line One	Kohlfurter Straße 41/43
Entity Address, City or Town	Berlin
Entity Address, Country	DE
ICFR Auditor Attestation Flag	false
Entity Address, Postal Zip Code	10999
Country Region	+49
City Area Code	30
Local Phone Number	868000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 99.7
Entity Common Stock, Shares Outstanding (in shares)		2,617,397
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Central Index Key	0001705338
American Depository Share (ADS)
Document Information [Line Items]
Title of 12(b) Security	American Depository Shares each representing one-tenth of an ordinary share
Trading Symbol	LOV
Security Exchange Name	NASDAQ
Ordinary Shares
Document Information [Line Items]
Title of 12(b) Security	Ordinary shares, €1.00 nominal value per share*
Trading Symbol	LOV
Security Exchange Name	NASDAQ