| Cover | Dec. 04, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | ASP ISOTOPES INC. |
| Entity Central Index Key | 0001921865 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | true |
| Document Period End Date | Dec. 04, 2023 |
| Entity Ex Transition Period | false |
| Entity File Number | 001-41555 |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 87-2618235 |
| Entity Address Address Line 1 | 1101 Pennsylvania Avenue NW |
| Entity Address Address Line 2 | Suite 300 |
| Entity Address City Or Town | Washington |
| Entity Address State Or Province | DC |
| Entity Address Postal Zip Code | 20004 |
| City Area Code | 202 |
| Local Phone Number | 756-2245 |
| Security 12b Title | Common Stock, par value $0.01 |
| Trading Symbol | ASPI |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
