AudioPen vs Letterly

AudioPen

• Writers and creators who draft by talking
• Capturing ideas on the move from a phone or watch
• People who find typing slow or painful, such as with RSI or dyslexia

Letterly

• One voice-notes app across phone, desktop and web
• Turning spoken ideas into emails, posts and journal entries
• Recording meetings or lectures for a transcript and summary

AudioPen

• Free recordings stop at 3 minutes, and free voice typing is limited to a set number of sessions.
• Prime is sold as fixed-term passes charged once ($33, $99 or $159), not as an auto-renewing subscription.
• It is not a meeting recorder: the vendor says it will not join a Zoom call or label who said what.
• Audio uploads need Prime and are capped at 100 files every 4 weeks, with a 100 MB limit per file.

Letterly

• Letterly's site has no pricing page; prices here come from its US App Store listing, which shows several price points for yearly and lifetime PRO.
• The support page limits the free version to 10 recordings of up to 3 minutes each.
• Vendor pages disagree on recording length: the support page says 15 minutes on Pro, the homepage and App Store listing say up to 90 minutes.

AudioPen

Transcribe, then rewrite

Each recording is transcribed and then rewritten into structured text, and the plain transcript is kept alongside the rewritten note.

Writing styles and rewrite level

A style library covers formats such as email, memo and bullet points, custom styles are built from a description or a writing sample, and the edit can be set to low, medium or high.

Voice typing in other apps

A hotkey on Mac and Windows, a keyboard on iPhone and iPad, and a floating bubble on Android place dictated text wherever the cursor is.

Speak one language, write another

The spoken language and the written language do not have to match, so a note dictated in Spanish can come back in English.

Offline transcription option

The iPhone, Android, Mac and Windows apps can transcribe on the device so audio never leaves it. The AI rewrite step still needs a connection.

Zapier, webhooks and MCP

Saved notes can be passed on through Zapier or webhooks, and the Prime-only MCP gives ChatGPT or Claude read-only access to search and read notes.

Letterly

Dictation in any app

Speak inside Gmail, Slack, Notion or any other text field on a computer, or use the Letterly keyboard on iPhone, and the text is inserted where you are typing.

Voice notes with AI rewrites

Record a thought in the app and get cleaned-up text. Choose from 25+ premade rewrite styles, such as an email, post or summary, or build your own.

Meeting and lecture recaps

Long recordings, up to 90 minutes per note, become a transcript split by speaker along with a summary.

90+ languages and translation

The spoken language is detected automatically, including switches mid-sentence, and any note can be translated into 90+ languages.

Audio upload and offline recording

Transcribe audio and video recorded outside the app, and record without an internet connection when you are away from one.

Zapier, webhooks and MCP

Send notes to other apps through Zapier or webhooks, and connect Claude, ChatGPT or Cursor over MCP to search, manage or rewrite your notes.

AudioPen

• Free$0

  Recordings up to 3 minutes, transcribed and rewritten in a chosen style, with a limited number of voice typing sessions.

• Prime 3 months$33

  one-time payment for 3 months

  Unlimited recordings up to 15 minutes, unlimited voice typing and rewrites, unlimited note storage, audio file uploads and SuperSummaries.

• Prime Yearly Pass$99

  one-time payment for 1 year

  The same Prime features for one year, charged once. The vendor works this out to $8.25 a month and labels it a 25% saving.

• Prime 2 Year Pass$159

  one-time payment for 2 years

  The same Prime features for two years. The vendor works this out to $6.63 a month and labels it a 40% saving.

Letterly

• Free version$0

  Up to 10 recordings of up to 3 minutes each, according to Letterly's support page.

• PRO (1 month)$19.99

  per month

  Unlimited recordings and AI rewrites. The App Store listing cites notes of up to 90 minutes.

• PRO (3 months)$44.90

  per 3 months

  The same PRO subscription billed every three months, as listed among the App Store in-app purchases.

• PRO (1 year)$69.99–$99.99

  per year; the listing shows several yearly price points

  Yearly PRO. The App Store lists it at $69.99, $79.99, $89.99 and $99.99 without saying which applies to new subscribers.

• PRO (Lifetime)$199.99–$249.99

  one-time; the listing shows two lifetime price points

  A one-time PRO purchase, listed on the App Store at both $199.99 and $249.99.

AudioPen

• Annual discount

  Longer Prime passes cost less per month

  Against the 3-month pass at $11 a month, the vendor labels the 1-year pass ($99) a 25% saving and the 2-year pass ($159) a 40% saving.

• Other savings

  20% off multiple Prime licenses

  Buying several one-year Prime licenses through the bulk purchase page, up to 100 per order, carries a 20% discount. Bulk purchases are not refundable.

Letterly

• Lifetime license

  Lifetime PRO listed from $199.99

  The US App Store listing includes a PRO Subscription (Lifetime) in-app purchase at $199.99 and at $249.99, alongside the monthly and yearly subscriptions.