Windows desktop client for the Inworld TTS API — generate unlimited-length audio, manage voices, and batch process files with full resume support.
The official inworld.ai website limits each generation to 2,000 characters, which makes it impractical for long-form content like audiobooks, podcasts, voiceovers, and narrations. Fatima TTS removes that limitation entirely:
| Limitation on inworld.ai | Fatima TTS |
|---|---|
| 2,000 character limit per generation | Unlimited text length — automatically splits and merges |
| No batch processing | Generate multiple jobs at once from CSV or TXT files |
| No resume if something goes wrong | Resumes from the exact chunk that failed — no re-billing |
| Manual download per job | Auto-saves audio + SRT subtitles to your output folder |
| No voice design tool | Design custom voices from text descriptions |
- Unlimited text length — automatically chunks long text and merges the audio seamlessly
- Batch Generate — process multiple jobs at once from a CSV or TXT file, sequential output naming (
01-Hook.mp3,02-Parte 1.mp3) - Resume on failure — if a job fails mid-way, only the failed chunks are retried — already completed chunks are not re-billed
- My Jobs — full history with waveform player, seek, SRT export, resume interrupted jobs
- Batch Detail — dedicated page per batch showing all jobs with play/save/status
- Voice Library — browse all voices, preview, filter by type
- Voice Cloning — upload audio samples and clone any voice
- Voice Design — describe a voice in text, generate previews, publish to library
- SRT Subtitles — word-level subtitle files saved automatically alongside every audio file
- FFmpeg Integration — auto-downloaded and managed, lossless batch merge into one file
- Dashboard — stats overview, 14-day usage chart, recent jobs
- Dark / Light theme — persisted preference
- Windows notifications — get notified when long jobs complete in the background
- Windows 10 or 11 (x64)
- Inworld API key
Download FatimaTTS-v1.0.0-installer.msi from the latest release and run it.
The installer will:
- Install to
C:\Program Files\Fatima TTS\ - Create a Start Menu shortcut
- Create a Desktop shortcut
- Register in Add/Remove Programs for clean uninstall
FFmpeg is downloaded automatically on first use (only needed for batch merge).
- Install and launch Fatima TTS
- Go to Settings and paste your Inworld API key
- Click Validate to confirm the key works
- Go to Generate Speech and start generating
Your API key is stored securely using Windows DPAPI — never written to disk in plaintext.
git clone https://github.com/hassanxs/fatima-tts.git
cd fatima-tts
dotnet restore FatimaTTS/FatimaTTS.csproj
dotnet run --project FatimaTTS/FatimaTTS.csprojdotnet publish FatimaTTS/FatimaTTS.csproj `
-c Release -r win-x64 --self-contained true `
-p:PublishSingleFile=true `
-o publish/Application logs are saved to:
%AppData%\FatimaTTS\logs\fatima_YYYY-MM-DD.log
Logs rotate daily and are pruned after 30 days. Open the logs folder from Settings → Logs → Open Folder.
- WPF / .NET 8 — Windows Presentation Foundation, C#
- NAudio — audio playback and waveform extraction
- Inworld TTS API — synthesis, voice library, cloning, design
- FFmpeg — batch audio merging (auto-managed)
- Windows DPAPI — secure API key storage
MIT — see LICENSE
Pull requests welcome. Please open an issue first to discuss significant changes.