Everything forgegen did happens in FunscriptForge's Generate tab, driven by the same engine: audio to funscript, phrase-level mode shaping, beat detection and energy analysis — plus the editing, multi-device output and export that used to need a second app.
Your existing .funscript files keep working. Nothing to migrate.
forgegen v0.3.0 stays downloadable below and keeps working offline, but receives no further updates or fixes. This site will be taken down; the GitHub repository remains as a record.
forgegen analyses the rhythm, phrase structure, and energy of any audio
track, then writes a phrase-aware .funscript ready to drive
any haptic device. Live per-stage progress, stable beat tracking — and
a clean handoff to FunscriptForge for refinement.
Latest release · Free · 3.5 MB installer · Open source
Pre-release software. Provided as-is, without warranty of any kind. Use at your own risk. macOS Intel build coming with a future tag (current macOS build is Apple Silicon only).
A quality first-draft funscript from any audio track — in under a minute.

Each phrase is classified — tease, steady, fast, edging, break, chaotic — and the curve is sculpted accordingly. Edging builds 50→100, breaks go quiet, teases narrow. Not a uniform beat-thump.

PLP-based tracker holds the beat through tempo changes and weak downbeats. Locked-BPM mode for tracks with a known fixed tempo. Sub-beat density: 1, 2, 4, or 8 actions per beat.

Every Style / Stroke-density / Tone option rendered as a velocity-coloured curve thumbnail with synced ◀▶ scroll and a 5-step zoom ladder (4s → 16s → 1m → 3m → 10m). Pick the option that fits before exporting.

Save writes the .funscript plus an .analysis.json sidecar — chapter proposals, source metadata, generation parameters. FunscriptForge auto-loads it on funscript open. Generate fast, refine deliberately.

Mean position, range, average velocity, p90 velocity, peak velocity — the same metrics FunscriptForge surfaces. Compare a generated curve to a gold-standard reference at a glance.

Runs on your machine. No cloud, no account, no telemetry. Your audio and funscripts never leave your computer. CLI and importable Python library for batch and pipeline workflows.
A four-step pipeline from raw audio to phrase-shaped funscript.
Detect the beat grid, BPM, phrase boundaries, and energy envelope. Embedded MP4 chapters or a chapters.json sidecar feed into the structural pass.
Label each phrase: break, tease, slow, steady, fast, or edging. Auto-tone derives a per-phrase tone from energy and density signals.
Sculpt the motion curve per mode. Pick a Style / Stroke-density / Tone combination from the comparison strip — or accept the auto pick.
Click Save. Validated .funscript JSON lands in your chosen folder, alongside a .analysis.json sidecar that FunscriptForge picks up automatically.
Standalone app — no Python, no ffmpeg install, no dependencies.
| Minimum | Recommended | |
|---|---|---|
| OS | Windows 10 (64-bit) · macOS 10.15 Catalina · Linux x86-64 | Windows 10/11 · macOS 12+ · Ubuntu 24.04 LTS |
| RAM | 4 GB | 8 GB or more |
| Disk | 1 GB for the app plus room for your media and outputs | SSD recommended for batch runs |
| Display | 1920 × 1080 | 2560 × 1440 QHD |
| Media length | v0.2 handles long files (multi-hour tested); auto-chapter splits long tracks into chapters. | |
| ffmpeg | Required on PATH — install from ffmpeg.org (or place ffmpeg.exe alongside the install). Will be bundled in a follow-up release. | |
| Python | Not required — standalone installer | |
Small, focused desktop tools that fit together. forgegen generates the draft; the others edit and assemble.
Structure-aware funscript post-processor. Picks up forgegen's analysis.json sidecar automatically — refine the generated draft per phrase, preview against the source, then export.
Concatenate many finished clips — video plus every funscript channel — into one long combined output. Chapter markers, fade-to-black joiners, per-section overlays, heatmap.