Unknown sound effects
Free CC0 unknown sound effects for games, apps, videos, and podcasts. 6 sounds.
Most downloaded unknown sounds
[Space Atmosphere 01 Remastered for sci-fi interfaces or game FX.·ambiance, ambience
[Space Atmosphere 04 Remastered for sci-fi interfaces or game FX.·ambiance, ambience
Tense radar-like electronic cue; great for thriller or sci-fi suspense.·ambient, bleep
An eerie deep-space drone, great as a backdrop for sci-fi films or cosmic horror games.·ambiance, ambience
A creepy cosmic drone with slow movement, ideal under sci-fi trailers or space exploration games.·ambiance, ambience
An unsettling, cyclical sound captured in Dunkerque, ideal for creating a mysterious atmosphere.·alien, cleaned
Lots of Sounds API
Get unknown sounds from code
Search the full CC0 catalog from your app, game or AI agent with the REST API or the MCP server.
curl
curl -G https://api.lotsofsounds.com/api/v1/sounds \
-H "x-api-key: $LOS_API_KEY" \
--data-urlencode "tags=unknown" \
--data-urlencode "limit=10"Questions
- What are unknown sounds used for?
- Unknown sounds are commonly used in apps, games, videos, podcasts, and interactive media projects.
- Can I use these sounds commercially?
- Yes. Every sound is CC0: free for personal and commercial use, with no attribution required. A credit link to lotsofsounds.com is appreciated but optional.
- How do I download a sound?
- Open any sound to preview it for free. Sign in to a Lots of Sounds account to download MP3 files.