Comparison

AI Voice Notes vs Second Brain

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

AI Voice Notes

Effortlessly capture your thoughts and ideas by speaking them aloud. This AI-powered tool transcribes your voice into structured, organized notes, complete with summaries and action items. It's designed to keep pace with your thinking, ensuring no idea gets lost.

Highlights
  • Voice to text transcription
  • AI-powered summarization
  • Automatic task extraction
  • Customizable templates
  • AI chat for notes
  • Apple Watch integration
  • Webhook integrations
Features
Read full description

Speak your mind. OneKey turns it into a clean, structured note — instantly. You think faster than you type. OneKey Notes keeps up. Tap once, talk it out, and AI writes the note for you: organized, summarized, and ready to use. No cleanup. No re-typing. Just your thoughts, captured before they slip away. Built for founders, executives, creators, and anyone whose best ideas show up at the worst possible moment — in the shower, mid-commute, or five minutes before a meeting. HOW IT WORKS 1. Tap and talk — say whatever's on your mind, however messy. 2. AI writes it up — clean, structured, and formatted the way you need. 3. It's yours — organized, searchable, and ready to act on. TALK, DON'T TYPE Hit record and speak naturally — in the car, on a walk, between meetings. OneKey does the rest. It's faster than writing and more organized than typing, so nothing gets lost to a slow keyboard. AI THAT WRITES THE NOTE FOR YOU Rambles become clean notes. Filler words disappear. Half-formed thoughts turn into something you'd actually want to read — no editing required. TEMPLATES THAT SHAPE EVERY THOUGHT Turn one recording into a task list, a journal entry, a meeting summary, a LinkedIn post — or your own custom format. Pick a template, get the exact output you need, every time. TASKS THAT FALL OUT AUTOMATICALLY OneKey pulls the action items out of your ramble and drops them into a dedicated Tasks tab. Nothing slips through the cracks. ASK AI ABOUT YOUR NOTES Chat with everything you've captured. Resurface that idea from last week, summarize a project, connect the dots across months of thinking — your second brain, on call. CAPTURE FROM YOUR WRIST Record a note straight from your Apple Watch. It's on your phone, transcribed and structured, before you're back at your desk. SEND NOTES WHERE THEY BELONG Trigger webhooks to push notes into n8n and the tools you already run on. Voice in, action out — OneKey doesn't just save your thoughts, it moves them. SHARE IN A TAP Send any note as a link or a beautiful image card. Whoever you share with can save it straight to their own account. SAYS YOUR NAME RIGHT Add your brand names, product terms, and jargon to a custom dictionary, so OneKey spells them correctly every time. YOUR VOICE STAYS YOURS Audio is never stored on our servers — it's transcribed, then discarded. Your notes are encrypted at rest. What you say stays between you and your second brain. 41 LANGUAGES Speak in your language. OneKey understands them all. PERFECT FOR - Brain dumps when your head is too full - Daily planning — talk through your day before it runs you - Journaling by speaking instead of writing - Meeting notes and follow-ups - Turning a ramble into a clean to-do list - Client notes, project ideas, and the thought that hits at 2am NOT JUST ANOTHER NOTES APP OneKey works even when you forget to open it — quietly resurfacing an old idea when it's relevant again, nudging a task before it's due, and keeping your streak alive. Calm, never spammy. It's the note-taking habit that actually sticks. WHY PEOPLE KEEP ONEKEY ON THEIR HOME SCREEN Most voice apps hand you a wall of text. OneKey hands you a finished note. That's the difference between a transcript you'll never reopen and a tool you'll reach for every day. Your best thinking happens out loud. Give it somewhere to land. Download OneKey Notes and never lose another idea. Start free — talk your first note in seconds, and let AI do the writing.

About

Second Brain

Read full description

Second Brain is a companion voice recorder for the Second Brain macOS app. Capture voice notes on the go and sync them to your Mac for transcription and AI analysis. The app automatically detects speech and silence (Voice Activity Detection), splits recordings into chunks, and transfers them to your Mac over the local network — no cloud involved. Features: - Voice recording with automatic Voice Activity Detection - Background recording — keeps working when the app is minimized - Live Activity — recording progress on Lock Screen and Dynamic Island - Seamless Mac sync via Bonjour (P2P, no cloud) - Geolocation tagging for recordings - Fully offline — all data stays on your device Pair your iPhone with the Second Brain macOS app to unlock transcription, knowledge extraction, and AI-powered search across all your voice notes.

Screenshots

AI Voice Notes4 screens
Second Brain4 screens

Verdict

The call

The clearest difference is in-app purchases: Second Brain at none against AI Voice Notes's 4. Second Brain also leads on ads (none vs shown). AI Voice Notes's advantage is device support (4 vs 2) and iOS requirement (15.1 vs 17.0). On price there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. AI Voice Notes sells 4 in-app purchases, starting at $6.99 per 7 days. Second Brain asks for nothing beyond the download.

Scorecard4 real differences · 5 level
AI Voice Notes versus Second Brain: the parameters behind the verdict, then further details
ParameterAI Voice NotesSecond Brain
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 days—
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.1 — better17.0
Further details — not scored
Size107 MB21 MB
Age rating4+4+
DeveloperAppeneure Technologies Private limitedKonstantin Akushev

In-app purchases

4 purchases

AI Voice Notes

Subscriptions3
  • Weekly Premium3 Days trial$6.997 Days
  • Monthly Premium7 Days trial$9.991 Month
  • Yearly Premium7 Days trial$99.991 Year
One-time1
  • Lifetime Premium$149.99
None

Second Brain

No in-app purchases

Questions

Is AI Voice Notes free?
AI Voice Notes is free to download, with in-app purchases available.
Is Second Brain free?
Second Brain is free to download, with no in-app purchases.
Do AI Voice Notes or Second Brain have ads?
AI Voice Notes shows ads; Second Brain does not.

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