AudioPen vs Letterly
AudioPen
audiopen.aiLetterly
letterly.appSide by side
| Figure | AudioPen | Letterly |
|---|---|---|
| Price from | $8.25/mo | $7.50/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 8 | 5 |
| Spec score · AI Voice Note Apps | 9.4 (#1) | 8.4 (#7) |
| Spec score · AI Voice Dictation Software | 9.5 (#1) | 8.5 (#8) |
| Headquarters | Nicheless, Inc. lists 651 N Broad St, Suite 206, Middletown, Delaware 19709, USA. | Valencia, Spain |
| Integrations | AudioPen supports Zapier and webhooks; webhook payloads expose note data as JSON for custom workflows. | Letterly supports Zapier and webhooks for sending notes to other apps. |
| Languages | AudioPen can write in a different language from the one spoken, and its site lists many supported languages. | Speech is automatically detected across more than 90 languages, including switching languages mid-sentence. |
Plans
AudioPen
- FreeFree
- FreeFree
- Prime (3 months)$33, paid once
- Prime 3 months$33, paid once
- Prime (1 year)$99, paid once
- Prime 1 year$99 a year
- Prime (2 years)$159, paid once
- Prime 2 years$159 a year
Letterly
- PRO Subscription (1 month)$19.99 a month
- PRO Subscription (3 months)$44.90 a month
- PRO Subscription (1 Year)$89.99 a year
- PRO Subscription (12 months)$99.99 a year
- PRO Subscription (Lifetime)$249.99, paid once
In their own words
AudioPen
AudioPen turns spoken thoughts into written text by transcribing speech and rewriting it in a style the user chooses. Users can set a low, medium, or high rewrite level, change output length, describe a style, or provide a sample to match. It can produce writing in a different language from the spoken input, and its site lists many supported languages. Voice typing works in text fields in apps such as Gmail, Slack, Notion, and Google Docs. Zapier and webhooks can send saved notes to other apps; Prime MCP provides ChatGPT or Claude read-only access to notes. Its iPhone, Android, Mac, and Windows apps offer on-device offline transcription, but AI rewriting needs an internet connection. The free plan permits recordings up to 3 minutes. Prime plans support recordings up to 15 minutes, with unlimited rewrites and note storage. The service is intended for individual thought: it does not join Zoom calls or label speakers. Voice-note audio is deleted from servers within 48 hours, and voice-typing audio is not saved.
Letterly
Letterly turns speech into text for messages, emails, notes, meeting summaries, journal entries, social posts, and other writing. Users can dictate inside apps such as Gmail, Slack, and Notion, or upload audio and video for transcription. Recordings can run up to 90 minutes, and speech is automatically detected across more than 90 languages, including when languages change mid-sentence. Users can select ready-made rewrite styles or create their own. Letterly can record offline, and Zapier and webhooks can send notes to other apps. Its MCP connects notes with Claude, ChatGPT, Cursor, Perplexity, Gemini CLI, Codex, VS Code, Windsurf, and Claude Code. Letterly says user words are not used to train AI; its DPA specifies encryption in transit and at rest, access controls, and regular security testing. Users can delete recordings and transcriptions through the app. It is available on Android, iOS, macOS, web, and Windows. In-app PRO prices include $19.99 a month, $89.99 a year, and $249.99, paid once.