01
iOS App · iOS
Practice at your own tempo.
SpeedPlayer
SpeedPlayer is a precision speed player for video and audio practice, with dual playback modes (continuous 0.25x–4.00x and precision 0.01x–0.24x), A-B loops, state memory, and local-first privacy.
Privacy-first
No account needed
Works offline
SpeedPlayer
- Status
- Live
- App Store
- iOS
- Tech Stack
- SwiftUI · AVFoundation · Core Data · StoreKit 2
At a glance
Fig. 01Mastery hides in the slow parts. Take the passage down to a crawl, loop the hard bar, and come back up to speed.
Features
No. 01Fast has its thrill; slow has its precision.
02
A-B loop, mirror, zoom, and per-video state memory
03
Video & audio support
MP4, MOV, MKV, MP3, FLAC, WAV, and more
Workflow
No. 02How a hard passage gets conquered.
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01
Load practice material
Import lesson videos or audio; playback is local and format-agnostic.
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02
Mark an A-B loop
Ring the toughest bars, loop them, and drop to 0.08x to follow along slowly.
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03
Climb back to full speed
Step back up to 1x as it settles. Per-video memory keeps your progress for tomorrow.
Trust & Privacy
No. 03Practice material stays local.
Privacy-first
Local-first: no account, no ads, no tracking — data never leaves the device.
No account needed
No sign-up, no login. Install it and it just works.
Works offline
Everything core runs offline; no network required.
Practice is the art of repetition. SpeedPlayer makes repetition precise — 0.01x stepping, looping, per-video memory — while keeping data on device. You just focus on the passage at hand.
Product Direction
No. 04Where this app is headed, in the maker’s own hand.
Precision Speed
Continuous and precision playback modes for practice.
Repeat Sections
A-B loop, mirror, zoom, and per-file state memory.
Media Coverage
Supports common video and audio formats for learning and rehearsal.
About SpeedPlayer
No. 5The longer story — what it is, who it is for, and the choices behind it.
Last Updated: 2026-04-23
SpeedPlayer is a practice-first media player built for users who want to study their own video and audio footage with precise speed control instead of managing a giant media library.
Core direction
- Load video or audio from Photos, Files, a direct media link, or open from other apps
- Dual playback modes: continuous mode (0.25x–4.00x, audio preserved) and precision review mode (0.01x–0.24x, ultra-slow, audio muted)
- Keep A-B loop, mirror, viewport, and playback memory per video
- Audio-only files show a dedicated vinyl record visualizer with rotation speed matching playback rate
Stage 1 product boundary
- SpeedPlayer is not a NAS browser, export studio, or AI coach in Stage 1
- SpeedPlayer is not a general web browser and does not provide a public content feed or searchable catalog
- The product focuses on importing quickly, resuming quickly, and refining one clip repeatedly
- Local files and playback state stay on-device by default
Supported media
Video formats
SpeedPlayer supports the following video formats: MP4, MOV, MKV, M4V, and HLS streams.
Audio formats
SpeedPlayer also supports audio-only files: MP3, AAC, M4A, FLAC, WAV, and AIFF. Audio files are automatically detected and played with a dedicated audio visualizer.
Format validation
SpeedPlayer uses the system media framework to validate files. If a file is not in a compatible format, SpeedPlayer will not import it.
Docs & Support
No. 6Plain-language documents. No fine print you would be surprised by.
Frequently Asked Questions
Some skills live below normal hearing speed: a fast lick on guitar, a dance transition, a bird's call. Precision mode (0.01x–0.24x) slows audio and video down to a crawl without changing pitch, so your ear can follow what full speed blurs past.
Continuous mode sweeps 0.25x–4.00x for normal fast/slow viewing. Precision mode steps 0.01x–0.24x for dissecting a single passage. Together they cover the full 0.01x–4.00x range, and you can pair either with A-B loops on the hard bar.
Yes — per-video state memory keeps speed, position, loop marks, and view settings for every file. Reopen a practice clip tomorrow and it resumes exactly as you left it, mirror and zoom included.
Common video and audio containers both: MP4, MOV, MKV for video; MP3, FLAC, WAV and more for audio. Language drilling and music practice work the same — the player does not care whether your practice material has a picture.
Yes — local-first by design. Your files and your practice history never leave the phone; there is no account and nothing to upload.