On-Device Whisper Transcription iPhone App
Run Whisper Large V3 Turbo on the iPhone with speaker separation, and sell private transcription by subscription or lifetime license without a per-hour API bill.
In plain English
Talks, interviews, and meetings can be written out on an iPhone without sending the audio to the internet, and the app tells different speakers apart. Buyers can pick a subscription or a lifetime purchase, which the maker can offer because there is no extra bill for each hour of audio. They want that privacy, since many other apps upload the recording. The AI does almost all of the transcription on the phone. The maker still works on speed and memory across different iPhones, helps the app get found in the store, and answers users.
$0–$1.3K MRR (example; $7,591 in 28 days including lifetime sales)
A named, real operator ran this and shared results publicly. The figures are their own.
Apple Developer Program $99/yr. Other costs not disclosed.
The tool stack
Speech model, converted to Core ML for on-device use.
RevenueCat ↗Subscriptions and lifetime purchases.
Apple Developer Program ↗App Store distribution.
Prices are the vendors' published list prices as researched in Oct 2026 and change often — always check the vendor's pricing page.
Step-by-step setup
- Pick a crowded category with one flaw: cloud transcription apps upload your audio.
- Port Whisper (Large V3 Turbo) to Core ML and add on-device speaker separation. The hard work is memory and speed across iPhone models.
- With no API cost, offer a lifetime purchase next to subscriptions.
- Lead App Store copy with privacy.
What's automated vs. the human 10%
The machine does
- Transcription on the device
You still do
- Performance engineering, ASO, support
Overview
A solo developer (Reddit u/Alternative_Tour1791) shared a RevenueCat snapshot for LoroNote: $7,591 over 28 days, $1,295 MRR, 258 active subscriptions (Oct 2026). The 28-day figure includes lifetime purchases.
Overlap note
The site already has Mac Whisper apps (MacWhisper, Yaps). This one is iPhone-first with on-device speaker separation. Merge it if that’s too close.
*Income figures are illustrative ranges based on public pricing and typical outcomes reported by practitioners, not guarantees. Most new online businesses earn little or nothing at first. Not financial, legal or tax advice.
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