Comparison

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.

Head to head
About

OX MONTH

Features
Read full description

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.

About

Second Brain Vault

Features
Read full description

β€œWhere did I save that?” 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 Intelligence–capable 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

OX MONTH4 screens
Second Brain Vault4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences Β· 2 level
OX MONTH versus Second Brain Vault: the parameters behind the verdict, then further details
ParameterOX MONTHSecond Brain Vault
PriceFreeFree
Update frequencyEvery 2 days β€” betterEvery 4 months
AdsYesNo β€” better
In-app purchasesYesYes
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS14.0 β€” better26.0
Further details β€” not scored
Size30 MB2 MB
Age rating4+4+
DeveloperNawon KyungByoungho Kim

In-app purchases

2 purchases

OX MONTH

Subscriptions2
  • OX MONTH Premium Monthly$4.991 Month
  • OX MONTH premium yearly$39.991 Year
1 purchases

Second Brain Vault

One-time1
  • Second Brain Vault (Lifetime)$17.99

Questions

Is OX MONTH free?
OX MONTH is free to download, with in-app purchases available.
Is Second Brain Vault free?
Second Brain Vault is free to download, with in-app purchases available.
Do OX MONTH or Second Brain Vault have ads?
OX MONTH shows ads; Second Brain Vault does not.
Which is updated more often, OX MONTH or Second Brain Vault?
OX MONTH ships an update every 2 days, and Second Brain Vault every 4 months. Most recently, OX MONTH was updated on October 31, 2026 and Second Brain Vault on November 5, 2026.

Other comparisons