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AI Script Generator for YouTube — Faceless Video Scripts, No API Keys

TubeForge's AI script generator writes faceless YouTube video scripts optimised for narration-driven production: a structured script with per-scene narration text, per-scene image prompts for visual generation, and a set of AI-generated opening hooks ranked by predicted retention. Everything is derived from your channel's brand bible (tone, niche, audience, banned topics, keyword clusters) so scripts stay on-brand automatically across every video. Scripts are generated by the managed Brain model (defaulting to GLM 5.2 — any managed text model selectable) and cost a few cents on your plan credits — no per-script fee in the app itself. The script flows directly into the rest of the TubeForge pipeline: voice, visuals, motion, and render all pick up from the same data, so there's no copy-paste between tools.

Free tier · no watermark · no API keys

What TubeForge's script generator produces

A TubeForge script is not a flat text document — it is a structured, per-scene narration file that the rest of the pipeline can consume directly. Each scene has a narration paragraph (the text TTS will read), an image prompt (what the image generator will create for that scene), a scene duration, and optional voice style and motion overrides. The Channel Assistant generates ~50 ranked video ideas per call (~$0.08), and selecting an idea kicks off the script generation — a full narration script with storyboard prompts typically costing a few cents in text generation. The Hooks tool generates 8–10 opening hook variants scored across six retention axes (curiosity, tension, specificity, promise, niche fit, pacing) so you can pick the hook most likely to hold attention in the first 30 seconds.

Brand-bible consistency across all scripts

TubeForge's brand bible is a channel-level document that captures tone, target audience, banned topics, recurring phrases, visual style, music mood, and keyword clusters — all authored once and reused across every script generated for that channel. When a new script is generated, the brand bible is included as context, so the AI knows the channel's voice and doesn't drift toward generic copy. A structured version of the bible (with discrete fields instead of free text) is also stored separately so scripts and image prompts can reference specific values programmatically. This is the kind of consistency that makes a faceless channel feel like a coherent brand rather than a collection of random narration videos.

Prompt caching keeps script generation cheap

When you pick a Claude model on OpenRouter, TubeForge automatically pins the Anthropic provider and attaches an ephemeral cache breakpoint on the brand bible context. Repeated calls that share the same bible (e.g. a second script on the same channel immediately after the first) benefit from prompt caching — the brand bible context is retrieved from cache rather than re-processed, cutting the input token cost for the repeated context significantly.

Script generation capabilities

  • ~50 ranked video ideas per channel in one call (~$0.08).
  • Full narration script from a one-line idea — a few cents on your plan credits.
  • Per-scene image prompts derived from the narration for coherent visual generation.
  • Hooks tool — 8–10 opening variants scored across six retention axes.
  • Brand-bible context on every call — consistent tone, avoided phrases, keyword clusters.
  • Per-scene editing — edit any narration line or image prompt and regenerate that scene only.
  • Retention analysis (Improve) — post-upload, AI ranks the script's weaknesses and retention risks.

What the AI script generator is designed for — and what it isn't

TubeForge's script generator is optimised for one format: narration-driven faceless YouTube videos — voiceover over visuals, no on-camera presenter. It writes in that structure by design: scene-by-scene narration paragraphs intended to be read by TTS, not spoken naturally by a human. If you produce content with a real on-camera presenter, interviews, live footage, or dialogue-heavy scripts, the format doesn't map cleanly to those use cases. For faceless narration channels — history, finance, motivation, sleep stories, Reddit recaps, top-10s — it is the right tool: it writes in that structure natively and the output flows directly into voice, visuals, and render without reformatting.

Try TubeForge on your own machine

TubeForge is a local-first desktop app for Windows 10/11 and macOS 11+ (Apple Silicon & Intel). Bring no API keys, render on your own GPU with bundled FFmpeg, set a per-video spend cap with Profit Mode, and keep every project on your disk. Grab the installer below.

Free tier + plans from $9/mo · no API keys · install guide

Frequently asked questions

How much does TubeForge's AI script generator cost?
The app is free to start (plans from $9/mo). Script generation costs a few cents per script on your plan credits via TubeForge's managed AI (no keys) — typically under $0.10 for a full narration script including storyboard prompts, depending on the model and script length. Channel-wide idea generation (~50 ideas) costs approximately $0.08. There is no per-script fee charged by the app.
What AI model writes the scripts?
The Brain role defaults to GLM 5.2 on OpenRouter. You can switch to any OpenRouter-supported text model in Settings → AI Providers → Brain — including Claude models, for which TubeForge automatically enables prompt caching to reduce the repeated brand-bible context cost.
Can I edit the AI-generated script before generating voice and visuals?
Yes, and that's the intended workflow. Every narration line and image prompt is editable directly in the app. You can edit a scene, regenerate only that scene (rather than the full script), or manually rewrite any line. The pipeline picks up your edited text when you generate voice and visuals — so the human editing step is fully integrated, not an afterthought.
Does the script generator know my channel's tone and brand?
Yes — that's the brand bible. TubeForge stores a per-channel brand bible (tone, audience, banned topics, keyword clusters, thumbnail style, music mood) and includes it as context on every script generation call. A Channel Assistant run generates the bible from a one-line niche description in a single AI call (~$0.08), and you can edit any field manually after generation.
Is the AI script generator for faceless channels only?
In practice, yes — the script format (scene-by-scene narration text + image prompts) is designed for narration-driven faceless video. On-camera scripts, dialogue scripts, and live-content scripts don't match the structure the pipeline expects. For narration-driven content in any niche (history, finance, sleep stories, motivation, top-10s, Reddit recaps), it fits naturally.

Get TubeForge free

Local-first, on Windows and macOS. Render on your own GPU with no watermark and no meter, and bring your own AI keys — try it on your own footage before you decide.