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MJSFX
Sounds & effects studio
MJSFX is a native Apple Silicon Mac app for making game sound effects. Start from built-in generators, layer multiple voices with their own effects chains and LFOs, or mutate and randomize to explore (undo on everything). Export WAV at 44.1/22/11 kHz in 16 or 8-bit, including per-layer stems. Light and dark themes plus a theme builder on the site. Custom MIDI controller support. Sound files are JSON. No AI in the app, but the direct download ships with an MCP server.
About MJSFX on Product Hunt
“Sounds & effects studio”
MJSFX was submitted on Product Hunt and earned 6 upvotes and 11 comments, placing #105 on the daily leaderboard. MJSFX is a native Apple Silicon Mac app for making game sound effects. Start from built-in generators, layer multiple voices with their own effects chains and LFOs, or mutate and randomize to explore (undo on everything). Export WAV at 44.1/22/11 kHz in 16 or 8-bit, including per-layer stems. Light and dark themes plus a theme builder on the site. Custom MIDI controller support. Sound files are JSON. No AI in the app, but the direct download ships with an MCP server.
On the analytics side, MJSFX competes within Design Tools, Music and Developer Tools — topics that collectively have 830.7k followers on Product Hunt. The dashboard above tracks how MJSFX performed against the three products that launched closest to it on the same day.
Who hunted MJSFX?
MJSFX was hunted by Matthew Schultz. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of MJSFX including community comment highlights and product details, visit the product overview.
Howdy Product Hunt 💥!
Matt here, dev behind MJSFX.
Why I built it: I started coding small indie web-based games at infinitetoast.com, then quickly graduated to native iOS (https://toastjuggle.app; Android version coming soon!). When I needed a game sound or effect I'd try rfxgen or jsfxr, which are solid tools, but I wanted something "more" and macOS native and nothing existed.
What MJSFX is:
🤘 Inspired by and stands on the shoulders of jsfxr, rfxgen, and sfxr
🎮 Generators to get you started: pickups, lasers, explosions, jumps, hits, etc.
🥞 Layer multiple voices, each with its own controls
🔗 Per-layer and main sound effects chain
🌊 LFOs that can modulate almost anything including itself and other LFOs
🎲 Mutate or randomize; undo on everything
💾 WAV export at 44.1/22/11 kHz, 16 or 8-bit, plus per-layer stems
⌨️ Keyboard shortcuts for (almost) everything
🎨 Themes: light, dark, and a theme builder on the site
🎛 Custom MIDI controller support (create your own config)
🔌 No in-app AI, but the direct download version ships with an MCP server
📄 Sound files are JSON
Available via Apple signed and notarized direct download and Homebrew. Or download from the Mac App Store: https://apple.co/4y9sQ5f
Free. Fully offline. No accounts, no network access (except dd/hb update checks to https://mjsfx.app), no telemetry, no ads.
Ask me anything.