Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Jul. 17, 2023	Oct. 31, 2022
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Registrant Name	HEART TEST LABORATORIES, INC.
Entity Central Index Key	0001468492
Current Fiscal Year End Date	--04-30
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
ICFR Auditor Attestation Flag	false
Entity File Number	001-41422
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	26-1344466
Entity Address, Address Line One	550 Reserve Street
Entity Address, Address Line Two	Suite 360
Entity Address, City or Town	Southlake
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	76092
City Area Code	682
Local Phone Number	237-7781
Entity Common Stock, Shares Outstanding		10,362,284
Entity Public Float			$ 17.9
Document Annual Report	true
Document Transition Report	false
Auditor Firm ID	200
Auditor Name	HASKELL & WHITE LLP
Auditor Location	Irvine, California
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock
Trading Symbol	HSCS
Security Exchange Name	NASDAQ
Warrants
Document Information [Line Items]
Title of 12(b) Security	Warrants
Trading Symbol	HSCSW
Security Exchange Name	NASDAQ