Your recording never leaves the device
Most apps that say "Whisper" send your audio to a server and run the model there. Whisper Notes runs it on your iPhone or Mac instead, which is a harder way to build the app and a much simpler thing to explain.
Why run the model on the device?
Every transcription app makes one decision before it makes any others: where the audio gets processed. Sending it to a server is the easier build and it buys you the largest models, which are still slightly more accurate. Running the model on the phone or the laptop is harder to get right, and it means the recording has nowhere to go.
We took the second option, and the reason is narrower than a privacy slogan. A voice recording is biometric data, and unlike a password you cannot reset it after a leak. Once the audio sits on someone else's infrastructure it is subject to their breach history, their retention policy, and whatever their terms say about training data — three things you have to keep track of for as long as the file exists.
Whisper Notes runs Whisper Large V3 Turbo, Parakeet V3 or SenseVoice on your device's Neural Engine, so there is no transcription server in the path at all. Nothing is queued, nothing is uploaded, and the app works the same in airplane mode as it does on wifi. That last part is worth testing yourself rather than taking our word for it.
What Happened to the Whisper App? Three Different Whispers
If you searched "what happened to the Whisper app," you are probably thinking of one of three very different things that share the same name.
The first is Whisper, the anonymous secret-sharing social app (whisper.sh) launched in 2012. It let people post confessions anonymously and was widely used in the mid-2010s, but it has largely shut down operations. If that is the app you were looking for, it is effectively gone.
The second is Whisper, the open-source speech recognition model OpenAI released in 2022. It never disappeared, because it was never an app in the first place. It is an AI model: the engine that converts spoken audio into text, freely available to developers but requiring technical setup to use directly.
The third is the category of native transcription apps built on that model, like Whisper Notes. These package the Whisper engine into software you can actually install and use on your iPhone or Mac, with no command line, no cloud account and no technical setup.
This page is about the third kind: what a local-first Whisper app is, how it works, and why we built ours to run entirely on-device.
The Three Whispers at a Glance
| Name | What It Is | Status |
|---|---|---|
| Whisper (social app) | Anonymous secret-sharing app (whisper.sh), launched 2012 | Largely shut down operations |
| Whisper (OpenAI model) | Open-source speech recognition AI model, released 2022 | Active and free, but a model rather than an app |
| Whisper Notes | Native transcription app for iPhone & Mac built on the Whisper model | Active, on the App Store, $7.99 one-time |
What does a free Whisper app cost?
A transcription tool that costs nothing usually works the same way: your audio goes to a server, the model runs there, and the recording stays long enough to be useful to whoever is running it. That is a reasonable trade for a lot of people. It is worth knowing you are making it.
Why a voice recording is different from a password
A leaked password is an afternoon of annoyance because you can change it. A leaked recording of your voice is permanent, because the thing that identifies you is the voice itself, and a few seconds of it carry enough acoustic signature to be recognised somewhere else entirely.
The part that changed recently is how little audio an attacker needs. Cloning a voice convincingly now takes seconds of sample rather than minutes, and in 2025 a cloned voice of Italy's defence minister was used in an attempted fraud against several businessmen. We are not claiming this is likely to happen to you. We are pointing out that it is the one category of leaked data you cannot rotate.
So when audio goes to a transcription service, what is being stored is not a document. It is a biometric, on infrastructure whose retention policy you do not set.
How transcription data actually leaks
The failure is rarely a dramatic break-in. It is that audio and transcripts pass through more systems than anyone drew on the diagram: the transcription vendor, the model provider behind it, a logging layer, an analytics pipeline, a backup. Each one is a place where a misconfiguration turns private into public, and the more of them there are, the less anyone can say with confidence where a given recording currently sits.
Healthcare has produced the clearest examples, where protected health information has been exposed through transcription integrations and misconfigured storage rather than through anything anyone would call an attack. Contact centres have produced another: transcripts streamed to a model while account numbers landed unmasked in debug logs.
None of that is an argument that cloud transcription is reckless. It is an argument that the number of systems holding a copy is the thing to count, and that on-device processing gets that number to one.
Which way is this heading?
In March 2025 Amazon removed the "Do Not Send Voice Recordings" setting from Echo devices. Everything said to Alexa now goes to Amazon's servers, and there is no longer a switch to turn that off.
One product removing one toggle is not a trend, but the incentive behind it is durable: training data is valuable, and a switch that reduces how much of it you collect is a switch under permanent commercial pressure. A privacy setting is a promise that can be revised in a release note.
Whisper Notes is built so there is no equivalent switch to revise. There is no server to send audio to, so "don't send it" is not a preference we are honouring; it is a description of what the app can do.
What the free tools cost over three years
Web tools that charge nothing generally reserve the right to use your audio to improve their models, which is disclosed in terms almost nobody reads. Metered APIs look cheap at $0.006 to $0.40 a minute until you transcribe an hour a week, at which point the annual bill is in the hundreds. Subscription services are the honest version of the same arrangement: Otter charges around $99 a year and tells you so.
Whisper Notes is $7.99 on the App Store and $14 for the Mac direct download, paid once. The table below is the whole pricing argument, and the fourth row is the point: the free option and the paid-once option cost about the same over three years, and they differ in what happens to the recording.
Cost per year
| Service Type | Year 1 | Year 2 | Year 3 | Data Handling |
|---|---|---|---|---|
| Whisper Notes | $7.99 | $0 | $0 | Never leaves device |
| Subscription Service | $99 | $99 | $99 | Cloud processed |
| Per-Minute Cloud API | $120-480 | $120-480 | $120-480 | Cloud processed |
| "Free" Web Tools | $0 | $0 | $0 | Used for AI training |
When you should use a cloud service instead
Frontier cloud models are still somewhat more accurate on clean audio, because they run at a size no phone or laptop can hold, and they can caption speech live in a way on-device transcription does not yet match. Those are real advantages and we are not going to pretend otherwise.
If you need live captions, if several people have to edit the same transcript while a meeting is running, or if the last fraction of accuracy matters more than where the audio sits, a cloud service is the better tool and we would rather you used one.
What we would push back on is treating that accuracy gap as the only number in the decision. For work under a confidentiality duty — clinical notes, privileged material, interviews with sources — "where does the audio go" is a question you have to be able to answer, and the shortest defensible answer is that it never went anywhere.
Browser tool, cloud API, or native app?
Searching for a Whisper app returns three quite different things wearing the same name: pages that run the model in your browser tab, APIs that run it on someone's server, and applications compiled for the device in your hand. They behave differently enough that the category matters more than the feature list.
Browser tools
When a browser tool says it processes locally, that is usually true: the audio stays in the tab. The limits are not about honesty, they are about what a tab can do. WebAssembly memory caps around 4GB in most browsers, which puts a ceiling on model size, and running inference through JavaScript costs speed that native code does not pay.
The constraint people actually run into is narrower and more annoying. A browser tool cannot keep working while you switch to another app, it reaches hardware acceleration awkwardly if at all, and closing the tab by accident loses the run with nothing to resume from. That is fine for trying a model out and frustrating as a place to keep your work.
| Processing | WebAssembly/TensorFlow.js in browser |
| Model Size | Limited by browser memory (~4GB) |
| Speed | Slower due to JavaScript overhead |
| Privacy | Better than cloud, but browser has access |
| Reliability | Tab can crash, no background processing |
Native apps
Whisper Notes is compiled for macOS and iOS and talks to the Neural Engine directly, which is the same dedicated silicon behind Face ID and computational photography. That is the whole reason the speed numbers on this page are possible: on an M4 Pro, Parakeet V3 gets through 35 minutes of audio in about 18 seconds.
The rest of the difference is unglamorous and matters more day to day. Transcription keeps running when you switch apps, the app picks up cleanly after an interruption, and the operating system's sandbox keeps it out of other apps' data. There is no upload path for your audio or its transcript, which you can check in about thirty seconds by turning on airplane mode and transcribing a file.
| Processing | Direct Apple Neural Engine access |
| Model Size | Full Whisper Large V3 Turbo (1.2GB) |
| Speed | Up to 10x real-time on Apple Silicon |
| Privacy | Sandboxed, no network permissions |
| Reliability | Background processing, system integration |
Cloud APIs
Server resources are effectively unbounded, so a cloud API can run the largest models and offer things that need serious compute, live captioning among them. On clean audio it will be the most accurate option on this page.
What you give up is knowing where the recording is. It travels the internet, is processed somewhere you do not administer, and is retained under a policy you did not write and can be changed without asking you.
For a therapist under a confidentiality duty, a lawyer handling privileged material, or a journalist protecting a source, that is usually where the evaluation ends — not because the accuracy is worse, but because the question "can you tell me where this recording is" has no good answer.
| Processing | Remote servers (unlimited compute) |
| Model Size | Largest available models |
| Speed | Depends on internet and server queue |
| Privacy | Audio uploaded and potentially stored |
| Reliability | Requires internet, subject to rate limits |
What we gave up to build it this way
Building natively was the only way to make the privacy claim structural rather than contractual. "Processed locally, then synced" and "encrypted in transit" are both true statements about systems that still end up holding a copy of your audio; we wanted the version where no copy exists to hold.
The bill for that comes due in features. We cannot caption speech live while you record, because the models that do that well do not fit on a phone. We cannot run anything larger than your device can hold. And we cannot offer shared editing or team workspaces, because those need a server and we do not have one.
If any of those three is on your list, this is the wrong app and one of the cloud services is the right one. We would rather say that here than have you find out after buying.
Where is the official Whisper app for iPhone?
There isn't one. OpenAI published Whisper as an open-source model for developers rather than as a consumer product, so there is no official Whisper app on the App Store or anywhere else, and anything claiming to be one is a third-party app using the name.
On iPhone, Whisper runs through native apps that convert the model to Apple's Core ML format and execute it on the Neural Engine. Whisper Notes is one of these: it runs Whisper Large V3 Turbo, alongside Parakeet V3 and SenseVoice, fully offline on iPhone 12 or later. You can record directly in the app, or import audio from Voice Memos, Files, or any app with a share sheet.
Whisper Notes is available as a one-time App Store purchase that includes the iPhone/iPad app and the Mac App Store version. No subscription or account is required. The direct-download Mac DMG is a separately sold license with a 10,000-word free trial. There is no Android version, because the app is built on Apple's Neural Engine hardware, which has no Android equivalent.
Technical Foundation: Whisper Large V3 Turbo
The AI Model
Specifications
| AI Models | Whisper Large V3 Turbo, Parakeet V3 (default), SenseVoice |
| Languages | 100+ languages with technical vocabulary |
| Audio Formats | MP3, WAV, M4A, FLAC, AAC, OGG, WMA |
| Processing Speed | Up to 10x real-time on Apple Silicon |
| File Size Limit | None (limited by device memory) |
| Platforms | iOS 18+ (iPhone 12+), macOS 11+ (Apple Silicon) |
Core Features
Whisper Notes is designed for professional transcription workflows where privacy and reliability matter.
File Import and Batch Processing
Import audio files from any source for offline transcription. The app processes complete files rather than streaming, which allows the model to use full context for improved accuracy.
- ✓Import from Files, Voice Memos, or any app that shares audio
- ✓Process multiple files in sequence
- ✓Background processing while using other applications
- ✓Automatic organization by date and source
Export Formats
Multiple output formats for different professional workflows.
- ✓Plain text with paragraph formatting
- ✓SRT and VTT subtitle files for video
- ✓Timestamped transcripts for reference
- ✓Speaker labels for multi-person recordings
- ✓Custom paragraph break settings
Privacy Architecture
The app is built so that your audio cannot leave your device, not as a setting but as a technical constraint.
- ✓No network permissions requested or granted
- ✓No cloud servers to connect to
- ✓No analytics or telemetry collection
- ✓Local storage only, encrypted by iOS/macOS
- ✓No third-party processor to cover with a BAA
How accurate is it, and where does that number come from?
Published benchmarks, plus our own timings on named hardware
We do not run our own accuracy study, because a vendor grading its own homework is worth very little. The word error rates below come from the Hugging Face Open ASR Leaderboard and the FLEURS benchmark, both public and both run by people with no stake in this app. The speed figures are ours, measured on one machine we name.
Word error rate by model
| Model | Source | Error rate | Notes |
|---|---|---|---|
| Parakeet V3 (default on Mac) | Open ASR Leaderboard | 6.32% English WER | 25 European languages; 12.0% average across them on FLEURS |
| Whisper Large V3 Turbo | Open ASR Leaderboard | 7.83% English WER | The widest coverage of the three: around 100 languages |
| Whisper Large V3 (full) | Open ASR Leaderboard | 7.44% English WER | Reference point; Turbo trades a little accuracy for speed |
| SenseVoice Small | Our test, M4 Pro | 27-minute podcast in 13.83s | Built for Chinese, Japanese, Korean and Cantonese |
Key Findings
- •Parakeet V3 transcribes 35 minutes of audio in 18 seconds on an M4 Pro; Whisper Turbo takes about three minutes for the same file
- •On English, the gap between the three models is under two points of word error rate
- •Word error rate is measured on read and prepared speech; your own recordings will do worse, and microphone and crosstalk move the number more than the choice of model does
Frontier cloud models still hold a small accuracy lead on clean audio, because they run at a size no phone or laptop can hold. That gap is the price of the audio never leaving your device. If your work does not require the last point of accuracy, the trade is usually worth it; if it does, a cloud service is the honest recommendation.
Market Comparison
How Whisper Notes compares to alternatives
A direct comparison of Whisper Notes against cloud transcription services, built-in device tools, and enterprise software.
Feature Comparison
| Feature | Whisper Notes | Cloud Services | Built-in Tools | Enterprise Software |
|---|---|---|---|---|
| Accuracy (clean audio) | 6.3-7.8% WER | Slightly better | Noticeably worse | — |
| Privacy | Complete (on-device) | Data uploaded | Varies by vendor | On-premise option |
| Cost | $7.99 once | $0.006-0.40/min | Free (limited) | $500-2000/license |
| Languages | 100+ languages | 50-100 languages | 10-30 languages | 20-50 languages |
| Internet Required | No | Yes | Sometimes | Depends on deployment |
| File Length Limit | Device memory only | 1-2 hours typically | 5-10 minutes | Varies |
Market Position: Whisper Notes occupies a specific position: professional-grade accuracy with complete privacy at consumer pricing. Cloud services offer higher accuracy without privacy. Enterprise software offers privacy at enterprise pricing. We offer the middle ground that most professionals actually need.
Professional Use Cases
Where local-first transcription matters
Healthcare
Medical professionals use Whisper Notes for patient documentation, clinical notes, and research interviews. Because the audio never reaches a server of ours, there is no third-party processor for a BAA to cover. Whether the whole workflow meets HIPAA still depends on how the device itself is secured.
Use Cases
- •Patient consultation documentation
- •Medical procedure notes
- •Research interview transcription
- •Telemedicine session records
- •Clinical training content
Benefits
- ✓No data-sharing policy to trust, because nothing is sent
- ✓Custom vocabulary for clinical terms and drug names
- ✓No PHI exposure to cloud services
- ✓Reduces documentation time significantly
Legal
Attorneys and legal professionals use Whisper Notes for depositions, client interviews, and case preparation. Attorney-client privilege is protected because recordings never leave the device.
Use Cases
- •Client interview documentation
- •Deposition transcription
- •Case research notes
- •Legal proceeding records
- •Investigative interviews
Benefits
- ✓Attorney-client privilege protected by architecture
- ✓Custom vocabulary for case names and legal terms
- ✓Court-ready transcript formatting
- ✓Fraction of professional transcription cost
Journalism
Journalists use Whisper Notes for source interviews and field recordings. Source protection is guaranteed because recordings cannot be subpoenaed from servers that do not exist.
Use Cases
- •Source interview transcription
- •Field recording documentation
- •Press conference notes
- •Research interview archives
- •Podcast production
Benefits
- ✓Source protection through architecture
- ✓Works offline in any location
- ✓No third-party access possible
- ✓Professional workflow integration
Performance and Limitations
What to expect from on-device processing
Performance Benchmarks
Processing speed depends on your device hardware. Newer Apple Silicon provides faster transcription.
Processing Speed
iPhone 15 Pro: 1 hour audio processes in approximately 6-8 minutes
Up to 10x faster than real-time on Apple Silicon
Battery Usage
1 hour of audio transcription uses approximately 8-12% battery
Optimized for Apple Neural Engine efficiency
Storage Requirements
App size: 1.2GB (includes Whisper model). Transcripts: approximately 0.1MB per hour of audio
Compressed text output minimizes storage
Memory Usage
Peak RAM usage: 2-3GB during active processing
Requires 4GB RAM minimum (iPhone 12 or later)
Known Limitations
On-device processing involves trade-offs. We believe these are acceptable for most professional use cases, but you should understand them before purchasing.
Device Requirements
Requires iPhone 12 or later, or Apple Silicon Mac. Older devices lack the Neural Engine performance for practical use.
Impact: Not compatible with devices more than 4-5 years old
Processing Time
Long recordings require proportionally longer processing time. There is no way around the physics of on-device computation.
Impact: A 4-hour recording takes 30-40 minutes to process
Audio Quality Dependency
Poor audio quality or loud background noise reduces accuracy. The model cannot recover information that is not in the signal.
Impact: Accuracy may drop to 70-80% with poor recordings
No Real-Time Transcription
The app transcribes after recording completes, not during. This is an intentional choice: full-file processing produces more accurate results.
Impact: Not suitable for live captioning use cases
Single Language Per Recording
Rapid language switching within a single recording reduces accuracy. The model performs best with consistent language throughout.
Impact: Best results with one primary language per file
So who is this for?
Download Whisper Notes
Transcription that runs on your iPhone or Mac. Free trial on Mac, so you can check the claim before paying for it.
Download on App StoreAvailable on iOS (iPhone 12+) and macOS (Apple Silicon). $7.99 one-time purchase. No subscriptions. No in-app purchases.