Spokio turns text into speech locally on iPhone and Mac, without sending your synthesis text or custom voice samples to a cloud TTS service.
The core workflow is the same on both platforms:
- Add text or import supported content.
- Choose a built-in or custom voice.
- Generate speech on-device.
- Listen and revise.
- Export the result.
The main difference is scale. iPhone is built for portable generation and individual audio creation. Mac is the more powerful option for projects, long-form documents, background queues, and batch/folder workflows.
What you need
- iPhone: iOS 26 or later
- Mac: macOS 15.6 or later; Apple Silicon and Intel are supported
- Spokio installed from the App Store
- English text you want to turn into speech
No API key is required for normal local generation.
Step 1: Add your text
Start with a short script or paragraph so you can quickly judge the voice and pacing.
On both iPhone and Mac, you can enter text directly and use supported file-import workflows when you already have content in a document.
The free tier supports up to 1,000 characters per synthesis, which is enough for short narration, proofreading, product copy, and small voiceover clips.
Step 2: Choose a voice
Spokio includes built-in English voices and supports custom voices created from a short recording or an audio file you have permission to use.
Choose a voice that fits the script before generating the full clip. Because synthesis runs locally, normal generation does not require uploading your text to a remote TTS service.
Step 3: Generate speech on-device
Generate the audio and listen to the result.
Performance depends on the device and the length of the text. A faster Mac or newer iPhone can finish local inference more quickly, but the workflow is the same: the speech-generation step happens on your device.
Step 4: Listen and revise
TTS is especially useful when the text is still changing. Hearing a draft can expose awkward phrasing, repeated words, pacing problems, and sentences that looked fine on screen.
Edit the text, generate again, and repeat until the result sounds right.
On iPhone, Spokio can reuse unchanged paragraph audio when possible during edits. On Mac, the same local-first approach scales into larger project and queue workflows.
Step 5: Export the audio
Once the result is ready, export it for editing, publishing, or sharing.
On iPhone
Spokio’s iPhone workflow supports individual exports as:
- WAV — useful when you want high-quality audio for editing
- M4A — compact and convenient for storage or sharing
On Mac
Spokio’s Mac workflow supports broader production formats and heavier export workflows, including:
- MP3
- WAV
- AIFF
- M4A
- M4B where supported by the workflow
Mac is also the better choice when you need to process many files or export work in batches.
On iPhone: portable local creation
Use the iPhone app when you want to create audio away from your desk, test narration quickly, work with a custom voice, or keep private drafts in an on-device workflow.
The iPhone app is intentionally lighter than the Mac version. It does not try to reproduce the full Mac long-form project system.
For a deeper mobile overview, see Best Offline Text-to-Speech Apps for iPhone in 2026.
On Mac: long-form and production workflows
Use the Mac app when the job becomes larger.
Mac is the stronger Spokio workflow for:
- EPUB and PDF projects
- batches of files
- long-form narration
- background queues
- folder organization
- batch and folder export
That makes it the better environment for audiobook drafts, course libraries, large creator projects, and repeated production work.
The full loop
Whether you start on iPhone or Mac, the basic loop stays simple:
write or import → choose a voice → generate → listen → revise → export
Use iPhone when portability matters. Use Mac when the workflow becomes long-form, file-heavy, or batch-heavy.
Try Spokio from the App Store and generate your first voiceover locally.
