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Audio: Voice, Music & SFX

Diffio

Restores speech in recordings made in noisy or echoey rooms, in the browser or through an API, including the audio of video files.

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Best for
Beginners and Pro users
Free plan
Free trial only
Agent-ready (MCP / API)
Partly
Platforms
Web, API
Last verified
Oct 26, 2026

Overview

Diffio does one job: it restores the speech in a recording you already have. Think of an interview in a loud lobby, a guest calling in from a kitchen, a lecture in a reverberant hall, or an old broadcast full of hiss. You upload the file, choose the faster Flash model or the slower Pro model, and switch between the original and the restored version as it plays. Video files keep their picture, and only the speech track is restored.

The free trial is a one-time allowance of three uploads, and you can only preview the first two minutes of each result. To download results you need Basic or Pro, which are sold by hours of audio a month. Developers can use the same models through a REST API that is billed per second, separately from the web plans.

Diffio restores speech but doesn’t edit or level it. If you also need loudness targets or transcript editing, pair it with a tool such as Auphonic or Descript. Results depend on the source recording, so try one of your own difficult clips before you choose a plan. Check Diffio’s pricing page for current figures.

Who it's for

A good fit if you are…

  • Podcasters, interviewers and lecturers with recordings that can't be made again
  • Developers who want to add speech restoration to their own product through an API

Another tool may suit you better if you are…

  • Live noise suppression during calls or streams (it processes uploaded files, not real time)
  • Music mastering or full audio editing

Pricing

One-time free trial of 3 uploads with 2-minute previews; Basic $8/mo (6 hours), Pro $29/mo (30 hours). API is pay as you go from $5/hour, billed separately. As of Oct 2026, verify.

  • Free: a one-time trial of 3 uploads in total (not monthly), audio or video. You can preview the first 2 minutes of each result. It uses the Diffio 4.6 Flash model, with no full playback, download, export or API access.
  • Basic: $8/mo for 6 hours (360 minutes) of audio or video a month. Adds the Diffio 4.6 Pro model, video support, and download and export.
  • Pro: $29/mo for 30 hours (1,800 minutes) a month, with the same features as Basic.
  • Web plans don't include API access.
  • API: pay as you go, billed per second with a 60-second minimum per request. Diffio 4.6 Flash costs $5.00/hour and Diffio 4.6 Pro $10.00/hour. Accounts start with $5 of API credit.
  • Uploads can run up to 90 minutes on every plan, per the How it works page.

Prices as of Oct 2026 (checked Oct 26, 2026), verify before buying. Source: vendor pricing page.

Key features

  • Removes background noise, reduces room echo and reverb, and repairs supported distortion and clipping in recorded speech
  • Restores the speech track of video uploads (MP4, MOV, AVI, MKV, WEBM) and leaves the picture unchanged
  • Switch between the original and the restored version during playback in the browser
  • A transcript with every result
  • REST API with Python and Node SDKs and webhooks, two models (Flash and Pro)

Integrations: REST API with Python and Node SDKs, webhooks, and a dashboard for keys, usage and billing.

Agent-ready? Partly. A REST API with Python and Node SDKs is available. No MCP server is listed.

Pros and good to know

Drawn from the vendor's own documentation and public sources.

Pros

  • Built for restoring speech in recordings you can't make again
  • Video uploads keep the picture while the speech track is restored
  • Compare the original and restored audio in the browser before you download
  • Per-second API billing with a small starting credit

Good to know

  • The free trial is one-time and preview-only, with no downloads
  • No ongoing free plan
  • Processes uploaded files in batches, not live audio
  • Not an audio editor; levelling, mixing and editing happen elsewhere
  • Quality is checked for English, French, German, Spanish and Portuguese; other languages run with a notice

Alternatives

  • Adobe Podcast: Browser tool that cleans up spoken audio with Enhance Speech, plus a beta studio to record and edit podcasts.
  • Auphonic: Automatic audio post-production for podcasts and video: levelling, loudness, noise reduction and speech recognition.
  • Descript: Edit video and audio by editing a text transcript, with AI tools for filler words, captions, clips and more.

Sources

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