Comparison

TwinMind 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

TwinMind

This app acts as an AI-powered second brain, capturing and transcribing your conversations, meetings, and lectures. It automatically generates summaries, suggests tasks, and builds a searchable memory bank for personalized assistance and content generation, all while prioritizing user privacy.

Highlights
  • AI-powered transcription
  • Automated summaries and action items
  • Searchable memory bank
  • Personalized AI suggestions
  • Content generation (emails, study guides)
  • On-device transcription
  • Privacy-focused data handling
Features
Read full description

TwinMind captures everything you say and hear in your conversations, meetings, and lectures. It automatically transcribes, summarizes, and proactively offers suggestions, so you never forget anything and always know what's next. The app builds your Second Brain by capturing your life. Every capture builds TwinMind in the background, all day without draining your battery. It works in any of 140+ languages. The longer you use TwinMind, the more it can do for you. ASK YOUR LIFE ANYTHING Whatever the question, it answers from your conversations, email, and the web. One subscription covers pro ChatGPT, Claude and Gemini like Sol, Opus, Sonnet & Fable. YOUR SECOND BRAIN People and memorable moments get their own pages, updating daily. Days of captures read like an encyclopedia of your life. PREPARED BEFORE YOU ASK Your daily digest lands every morning with yesterday's highlights and today's priorities. Connect your calendar and email to get briefed on what's next, with replies already drafted. TURN CONVERSATIONS INTO CREATIONS Connect TwinMind to Claude or ChatGPT over MCP, and your memories become reports, prototypes, drafts, or anything you can describe. PRIVATE BY DESIGN Audio is deleted after transcription by default. If you turn on Save Audio, we store it until you delete it. When you record offline, audio stays on your device until it is transcribed. How it works: • Tap Capture on your phone, watch, or laptop • Put the phone away; it transcribes in the background all day • Every capture becomes a memory, with the summary, action items, and transcript • Your second brain fills itself in with people, projects, and moments • Your daily digest arrives each morning with yesterday's highlights and your priorities • Chat across memories, with your email, calendar, and digital life included • Connect Claude or ChatGPT and turn memories into creations Try TwinMind on your next conversation. It's free, with unlimited transcription. Upgrade to Pro or Max for advanced features & the latest flagship models. Supported platforms: Available on iPhone, iPad, Apple Watch, and Mac. Top supported languages: English, Chinese (Simplified), Hindi (हिन्दी), Spanish (Español), French (Français), Arabic (العربية), Bengali (বাংলা), Portuguese (Português), Russian (Русский), Urdu (اردو), Indonesian (Bahasa Indonesia), German (Deutsch), Japanese (日本語), Nigerian Pidgin, Marathi (मराठी), Telugu (తెలుగు), Turkish (Türkçe), Tamil (தமிழ்), Cantonese (廣東話), Vietnamese (Tiếng Việt) Terms of Service: https://twinmind.com/terms-of-service/ Privacy Policy: https://twinmind.com/privacy-policy/

About

Second Brain

This AI-powered journal captures your thoughts via voice or text, automatically organizing and connecting them. It helps you recall memories, discover patterns, and reflect on your growth.

Highlights
  • AI classification, tagging, and summarization
  • Semantic search by meaning
  • Three-layer memory system
  • People cards for relationship tracking
  • Weekly AI reflections
  • Voice input with transcription
  • Data export (JSON + Markdown)
Features
Read full description

Most notes get written once and never read again. Second Brain reads them for you. Write a line whenever something is on your mind, and once a week it tells you what your week was really about. You don't need to keep a diary or a streak. One line a day is enough. YOUR WEEK, READ BACK TO YOU The weekly insight covers what took up your attention, what changed since last week, and one concrete thing to try. Every insight shows the notes it came from, so you can check it against what you actually wrote. Your first weekly insight is free. Once a month you get a longer read on where the month went. After your first five notes there's also a first impression of you, and it fills in as you keep writing. CAPTURE Type, or press and hold to speak. Share text, links or images from other apps, or pick screenshots and the text in them is read on your phone. Each note gets a title and tags automatically, so there's nothing to file. ASK YOUR PAST Explore searches by meaning, not only keywords. Ask "What did I decide about the move?" or "What did Anna say last time?" and get an answer built from your own notes. PEOPLE Keep a card for the people in your life: what they said, what you did together, what to bring up next time. Before you meet someone, a reminder shows your open to-dos and what you talked about last time. REMINDERS AND WIDGETS Write "dentist next Friday at 3pm" and it becomes a reminder and a checklist item. There are widgets for the Home Screen and Lock Screen, and the checklist can run as a Live Activity. PRIVACY Your notes are stored on your device. There's no account to create and no server of mine in between. To title, tag and reflect on your notes, their text is sent to a cloud AI service. If your iPhone supports Apple Intelligence, you can turn on On-Device AI and new notes are handled on the phone instead; Explore and reflections still use the cloud. Every AI result is labeled "On device" or "Cloud AI", so you can see which is which. iCloud sync is optional and uses your own iCloud account. You can export everything as JSON or Markdown at any time, for free. FREE AND PRO Free: 5 notes a day, daily reflections, your first weekly insight, and export. Pro: unlimited notes, weekly insights and monthly reads, 20 Explore questions a day, up to 30 screenshot imports a day, unlimited people, the memory graph and life themes, iCloud sync, and the Rainbow Aurora theme. Pro is a monthly or yearly subscription. The yearly plan comes with a 7-day free trial, the monthly plan with 3 days. Payment is charged to your Apple ID and renews automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel it in your App Store account settings. Second Brain is made by one person, Lemon. Terms of Use: https://smartkiitos.com/secondbrain/terms/ Privacy Policy: https://smartkiitos.com/secondbrain/privacy/

Screenshots

TwinMind4 screens
Second Brain4 screens

Verdict

The call

The clearest difference is monetization model: TwinMind at free against Second Brain's freemium. TwinMind also leads on ratings volume (872 vs 2) and rating (4.8 vs 4.5). Second Brain's advantage is review sentiment (100% vs 79%). On price, update cadence, ads and in-app purchases 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. TwinMind sells 10 in-app purchases, starting at $14.99 per month and Second Brain sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

TwinMind holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: TwinMind has 872 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 79% of TwinMind's written reviews are positive against 100% of Second Brain's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

TwinMind ships an update weekly, Second Brain every 9 days. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

Scorecard5 real differences · 5 level
TwinMind versus Second Brain: the parameters behind the verdict, then further details
ParameterTwinMindSecond Brain
PriceFreeFree
Rating4.8 (872 ratings) — better4.5 (2 ratings)
Positive reviews78.7% of reviews100.0% of reviews — better
Number of ratings872 — better2
Update frequencyWeekly — betterEvery 9 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS17.017.0
Further details — not scored
Size136 MB12 MB
Age rating4+4+
DeveloperThirdEar AI IncLiwei Xie

Customer experience

TwinMind

All ratings872 ratings
Positive94.6%
Neutral1.1%
Negative4.2%
Written reviews197 reviews
Positive78.7%
Neutral4.6%
Negative16.8%

Second Brain

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

TwinMind

Requested features

1 request
  • Capture widget for quick access

Second Brain

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

TwinMind

Subscriptions10
  • TwinMind PRO Dev (Monthly)3 Days trial$14.991 Month
  • TwinMind PRO (Monthly)$14.991 Month
  • Unlimited access$15.001 Month
Show 7 more
  • TwinMind MAX Dev (Monthly)7 Days trial$29.991 Month
  • TwinMind MAX (Monthly)7 Days trial$49.991 Month
  • Unlimited Access$119.991 Year
  • TwinMind PRO (Annual)$143.991 Year
  • TwinMind PRO Dev (Annual)7 Days trial$149.991 Year
  • TwinMind MAX Dev (Yearly)7 Days trial$289.001 Year
  • TwinMind MAX (Yearly)7 Days trial$359.991 Year
2 purchases

Second Brain

Subscriptions2
  • Second Brain Pro3 Days trial$4.991 Month
  • Second Brain Pro7 Days trial$39.991 Year

Questions

Is TwinMind free?
TwinMind is free to download, with in-app purchases available.
Is Second Brain free?
Second Brain is free to download, with in-app purchases available.
Which has better reviews, TwinMind or Second Brain?
TwinMind is rated higher. TwinMind averages 4.8 out of 5 from 872 ratings, while Second Brain averages 4.5 from 2 ratings.
Do TwinMind or Second Brain have ads?
Neither TwinMind nor Second Brain shows ads.
Which is updated more often, TwinMind or Second Brain?
TwinMind ships an update weekly, and Second Brain every 9 days. Most recently, TwinMind was updated on October 15, 2026 and Second Brain on October 10, 2026.

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