OX MONTH vs Second Brain Vault
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
OX MONTH
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OX MONTH is a simple habit tracker that helps you stay consistent one day at a time. Mark your daily habits with O or X, track your progress monthly, and build better routines without pressure. Features: β’ Simple O/X habit tracking β’ Monthly habit calendar β’ Daily reminders β’ Progress statistics β’ Minimal and clean design β’ Widgets and notifications β’ Premium insights and advanced features Start small. Stay consistent. Change your month. --- Auto-renewable subscriptions β legal (Guideline 3.1.2 required) Terms of Use (EULA): https://www.newon.app/terms/ox-month-eula.html Privacy Policy: https://www.newon.app/privacy/ OX MONTH Premium: monthly and yearly auto-renewable subscriptions. Billed to your Apple ID; manage or cancel in Settings β Apple ID β Subscriptions.
Second Brain Vault
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βWhere did I save that?β β now you can just ask. Save a note, photo, PDF, voice memo or link; the on-device AI titles, summarizes and tags it, then finds it by meaning later. Free for 100 saves. No account, no server. We're all good at saving. The real question was always "where did I put that?" Second Brain Vault flips the order: you save, the AI organizes and recalls. HOW IT WORKS β’ Save in one tap β a note, a photo, a voice memo, a PDF, or a web link. Anything, instantly, into your vault. β’ AI organizes it for you β every saved item gets a title, a summary, a category, and tags, automatically. Photos are read with OCR, voice is transcribed, PDFs and links have their text extracted. β’ Recall like a person β ask "that real-estate article I read last year," "the best cold-noodle place I saved," "the app idea I jotted last month," and it finds the right memory. It's hybrid retrieval β semantic meaning plus keywords plus recency β so it works even when you don't remember the exact words. β’ It grows with you β Insights show your top topics and saving trends, and every week the AI writes a short Retrospective of what you saved. The more you save, the higher your Brain Level. WHAT'S INSIDE β’ Home β today's and recent items, plus a one-line AI insight β’ Quick capture β five kinds: note, photo, audio, PDF, link β’ Natural-language Recall β hybrid semantic + keyword + recency ranking β’ Insights β top topics, save volume, Brain Level growth β’ Weekly Retrospective β an AI recap of your week of memories β’ Automatic categories & tags β organized without you filing anything PRIVACY BY CONSTRUCTION Everything is processed on this iPhone. Because it uses Apple's on-device AI (Foundation Models), your notes, photos, voice and documents never leave the device. No account, no server, no ads, no tracking. The only time it uses the internet is to fetch the page of a web link you choose to save. APPLE INTELLIGENCE REQUIRED Auto-organizing, natural-language search, Insights and the Retrospective run on Apple-Intelligence-capable devices. On other devices you can still save and search by keyword; the AI features show an "Apple Intelligence required" state. START FREE, UNLOCK WHEN YOU NEED IT Free: up to 100 items, full on-device AI organizing & search on all 100, every capture type, Insights and Brain Level included. Pro (β©6,600 / year): unlimited saves, iCloud backup & sync, weekly Retrospective history, and more. Lifetime (β©29,000, one-time): everything in Pro, forever, no renewal. You save it; Second Brain Vault remembers it. Drop in your first memory today. β Device requirements AI auto-organizing and semantic (meaning-based) search require an Apple Intelligenceβcapable device β iPhone 15 Pro / 15 Pro Max and iPhone 16/17 or later, iOS 26 or later. On other devices, saving and keyword search still work fully. Everything is processed on-device; nothing is ever sent off your iPhone. β Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://blue-code.github.io/legal/second-brain-vault/privacy.en.html
Screenshots
Verdict
The clearest difference is ads: Second Brain Vault at none against OX MONTH's shown. OX MONTH's advantage is update cadence (every 2 days vs every 4 months) and device support (3 vs 1). On price and in-app purchases there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. OX MONTH sells 2 in-app purchases, starting at $4.99 per month and Second Brain Vault sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
OX MONTH ships an update every 2 days, Second Brain Vault every 4 months. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | OX MONTH | Second Brain Vault |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days β better | Every 4 months |
| Ads | Yes | No β better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod β better | iPhone |
| Requires iOS | 14.0 β better | 26.0 |
| Further details β not scored | ||
| Size | 30 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Nawon Kyung | Byoungho Kim |
In-app purchases
OX MONTH
- OX MONTH Premium Monthly$4.991 Month
- OX MONTH premium yearly$39.991 Year
Second Brain Vault
- Second Brain Vault (Lifetime)$17.99
Questions
Is OX MONTH free?
Is Second Brain Vault free?
Do OX MONTH or Second Brain Vault have ads?
Which is updated more often, OX MONTH or Second Brain Vault?
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