2ndBrain vs LumenDoc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
2ndBrain
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Discover the ultimate AI ChatBot experience with '2ndBrain', your new digital assistant and writing companion. Our advanced app utilizes powerful AI architecture to bring you seamless, intuitive interactions and help you communicate effectively in various contexts. Be it a professional email or an engaging blog post, '2ndBrain' has got you covered! Download now and enjoy the convenience of AI-powered Actions, voice messaging support, and an intelligent interface that will revolutionize the way you chat, write, and interact. 2ndBrain - Intelligent Conversational AI: Tap into the power of AI, one of the most advanced AI architectures available. 2ndBrain's ChatBot provides a natural, human-like conversation experience that understands context and adapts to your needs. Engage with a personal assistant that's always ready to help and answer your questions on a wide range of topics. AI Writing: Powered by AI Take your writing to new heights with AI-powered Actions that enable you to create blog posts and emails in a flash. 2ndBrain’s advanced algorithms generate high-quality content that's contextually relevant, engaging, and tailored to your requirements. Say goodbye to writer's block and hello to a streamlined, efficient writing experience. Voice Messaging Support: Switch to voice messaging with ease when you need a break from typing. 2ndBrain supports voice messages, allowing you to communicate more efficiently and access your AI ChatBot's features through speech. Speak your mind, and let the app's powerful voice recognition capabilities take care of the rest. Multilingual Support: Our AI ChatBot understands and communicates in multiple languages, making it perfect for users around the globe. Whether you're writing a professional email in English or a casual chat in Spanish, 2ndBrain will adapt to your linguistic needs. Secure and Private: Your privacy is our top priority. 2ndBrain is designed with end-to-end encryption to keep your data and conversations secure, ensuring a safe and private experience at all times. Continuous Updates and Support: Our team is dedicated to providing you with the best AI ChatBot experience. We continually update 2ndBrain with new features, improvements, and optimizations to ensure you stay ahead of the curve in the rapidly-evolving AI landscape. Join the 2ndBrain community today and revolutionize the way you communicate, write, and collaborate with the power of 2ndBrain, AI-powered content writing, and voice messaging. Download now and enjoy the most intelligent, intuitive, and interactive AI ChatBot experience. You may purchase an auto-renewing subscription through an In-App Purchase. • Auto-renewable subscription • 1 month ($5.99) duration. • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be canceled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. • Privacy policy: https://2ndbrain.chat/privacy_policy.html •TERMS & CONDITIONS: https://2ndbrain.chat/terms_and_conditions.html
LumenDoc
Transform your paperwork into a searchable digital library. Scan documents, extract key information with AI, and ask questions to find details instantly. Set reminders for important dates and track spending without linking bank accounts.
- Scan documents with AI Vision
- Ask questions about your documents
- Track spending from receipts
- Set reminders and calendar events
- Private iCloud backup (Pro)
- On-device OCR fallback
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LumenDoc turns receipts, bills, medical letters, warranties, contracts and everyday paperwork into a searchable document library. Scan a page, let AI Vision extract the details, track what you spend, and turn important dates into reminders or calendar events. WHY LUMENDOC SCAN PAPERWORK FAST Capture receipts, bills, IDs, school forms, appointments and important letters with your iPhone camera. LumenDoc extracts text, dates, amounts, vendors and document categories so your library is useful from the first scan. ASK YOUR DOCUMENTS Instead of digging through folders, ask questions like: - When is my appointment? - How much did I spend at Coles? - Where is the warranty for my appliance? LumenDoc answers from your own scanned documents and links back to the source. TRACK SPENDING FROM RECEIPTS AND BILLS Receipts, invoices, bills and fines can feed a spending dashboard automatically. See totals, merchants, categories and trends without connecting a bank account. REMINDERS AND CALENDAR INTEGRATION Turn due dates, appointments, renewals and expiries into reminders or calendar events so bills, warranties, appointments and important follow-ups do not get lost. DESIGNED FOR PRIVACY Your scanned page images stay on your device after AI Vision OCR. LumenDoc sends document images to Google Gemini through our private backend only when AI Vision is used for scanning. Library Ask sends relevant OCR text excerpts, not your page images. Your data is not used to train AI models. FREE AND PRO Free includes 5 lifetime AI Vision scans and 15 lifetime Library Ask questions. Free counters do not reset. LumenDoc Pro includes 100 AI Vision scans per subscription cycle, unlimited Library Ask, full spending history and private iCloud backup. After a Pro user's AI Vision quota is used, scanning continues with on-device OCR until the quota resets on the billing anniversary. Subscriptions are managed by Apple through the App Store. Cancel any time in iOS Settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lumendoc.net/privacy
Screenshots
Verdict
The clearest difference is update cadence: 2ndBrain at every 5 weeks against LumenDoc's every 3 months. 2ndBrain also leads on iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support 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
Both are free to download. 2ndBrain sells 9 in-app purchases, starting at $1.99 per 7 days and LumenDoc sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
2ndBrain ships an update every 5 weeks, LumenDoc every 3 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.
| Parameter | 2ndBrain | LumenDoc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 79 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Shajeel Afzal | David Mendez |
In-app purchases
2ndBrain
- Weekly Subscription$1.997 Days
- .Weekly Subscription$2.997 Days
- Weekly Subscription.$3.997 Days
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- Monthly Subscription.3 Days trial$4.991 Month
- Monthly Subscription.3 Days trial$5.991 Month
- Monthly Subscription.3 Days trial$6.991 Month
- Quarterly Subscription.3 Days trial$13.993 Months
- Quarterly Subscription.3 Days trial$14.993 Months
- Quarterly Subscription.3 Days trial$17.993 Months
LumenDoc
- LumenDoc Pro7 Days trial$4.991 Month
- LumenDoc Pro Yearly7 Days trial$39.991 Year









