Comparison

CastleKeyp vs AIMailMind

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

Head to head
About

CastleKeyp

Securely store and manage all your sensitive personal information, from passwords to family details. Access your encrypted data from anywhere and share specific information with trusted contacts. Organize social circles and never miss important dates with an integrated calendar.

Highlights
  • End-to-end encrypted data storage
  • Securely store passwords, bank details, and personal profiles
  • Share specific information with trusted contacts
  • Organize social circles and custom groups
  • Integrated calendar for important dates
  • Contact management for family and friends
Features
Read full description

At every stage of life, CastleKeyp helps you organize and manage the business of life. Organize your important personal information, keep up relationships, and lighten the mental load. Store your sensitive personal information and access it from anywhere. End-to-end encryption protects your information for total privacy and security. Your information is just between you and the people you choose. Not even CastleKeyp can see it. Your CastleKeyp Profile: Home address, birthdates, allergies, family information and more - personal information you wouldn’t normally put online is entirely private and secure in your end-to-end encrypted CastleKeyp Profile. Only you and the people you choose to connect with on CastleKeyp can see it. Control what others see – share all or just parts of your Profile. Your Profile is free to create and share with as many CastleKeyp Contacts as you choose. Great for remembering birthdays, sending gifts and much more! Your end-to-end encrypted Keyp: Welcome to your very own online Keyp: a single, accessible place to store and organize all of your personal information, end-to-end encrypted. As secure as a password safe, it's a template for organizing your home life - store home utility account information, family blood types, frequent flier accounts - every bit of personal information, so you never lose track again. Have your partner or trusted family member join CastleKeyp and you can permission them to see your Keyp - manage life together. Otherwise, it's for your eyes only. Securely store information you need to manage the business of life. It will be there when you need it. One place, good for life. Connect better: Keep track of extended family and friends, with a fraction of the headache. Every CastleKeyp member updates their own Profile – so it's good information, right from the source - and no more trying to keep track of moves, contact information changes, children’s names, ages, allergies. Manage just your own CastleKeyp Profile instead of all of your contacts' cards. Have the useful information you need to reach the people who matter most in your life, for life. From a high school graduation to a wedding to a funeral and everything in between, reach your people when it matters most. Joining CastleKeyp is free, private and secure - invite your friends, family and community. You can connect with unlimited CastleKeyp members. Organize your social life: We all have different social circles – Book Club, Wine Club, PTA, Fantasy Football, Little League, volunteer organizations. Create Custom Groups to keep in touch more easily. Send emails, text or export contact information with a single tap. Use CastleKeyp's Holiday Cards Group, and export your addresses for the printer with a single tap. Or share sensitive personal information with a Partner or family member with CastleKeyp’s Pre-Set groups – clothing sizes for you and your family; SSNs and more with a Partner or family. Never miss an important date again: When does your passport expire? Put it into CastleKeyp, and you'll get a helpful reminder. All of your important dates populate automatically on the in-app Calendar. Birthdays and anniversaries for your CastleKeyp Contacts, expiration and due dates for your passport and more, all in one place. Get custom in-app and push notifications to stay on top of it all. Save time, money and hassle with reminders for expiration and due dates for passports, credit cards, property tax bills, insurance policies and more. Keyp your life in order - and spread the word! At every stage of life, CastleKeyp helps you organize and manage the business of life. All in one place.

About

AIMailMind

Features
Read full description

MailMind is a native iOS email client that uses AI to triage, summarize, and translate your inbox — so you spend less time reading and more time responding to what actually matters. WHY MAILMIND Your inbox is noisy. Bank alerts, subscription renewals, package deliveries, security codes, promotions, and the occasional real message from a human all compete for attention. MailMind reads each email on your device and gives you a clear, color-coded picture of what's happening and what needs action. AI-POWERED SMART INBOX • Urgency detection — every message is tagged high / medium / low so you know what to open first • Plain-language summaries — a one-sentence explanation of what each email means • Suggested actions — "Act now", "Act this week", "Review only", or "Archive" — based on the message content • Entity extraction — amounts, currencies, organizations, and deadlines pulled out automatically • Smart categories — security, billing, transactions, promotions — filter your inbox with one tap MULTIPLE PROTOCOLS, MULTIPLE PROVIDERS • IMAP and POP3 support for virtually any mail provider • Region presets for iCloud, Outlook, Yahoo, Zoho, Proton Mail, QQ, NetEase 163/126, Sina, Yahoo! Japan, DOCOMO, OCN, and more • Custom IMAP setup for self-hosted or enterprise servers • Full send support with attachments, drafts, and threading MULTILINGUAL AI MailMind understands email in English, Chinese, and Japanese — and generates AI summaries in whichever language you prefer. Perfect for anyone who sends and receives mail across languages. PRIVACY-FIRST DESIGN • No developer-operated server stores your email • All messages live on your device; credentials are stored in the iOS Keychain • AI processing is user-initiated only — a message goes to our AI gateway just for that one request and is never retained, logged, or used for training • No trackers, no ads, no analytics SDKs NATIVE iOS Built from scratch with SwiftUI. Dark mode, dynamic type, haptics, multi-account, swipe actions, pull-to-refresh, and a bottom tab bar that feels at home on iOS 17 and later. TRY DEMO MODE Not ready to connect your email? Tap "Try Demo" on the add-account screen to explore MailMind with sample messages, pre-baked AI analyses, and all categories — no credentials required. REQUIREMENTS • iOS 17 or later • Compatible with iPhone and iPad • Optional: an email account with IMAP/POP3 access MailMind does not require a subscription. There are no in-app purchases, no ads, and no account signup with the developer.

Screenshots

CastleKeyp4 screens
AIMailMind2 screens

Verdict

The call

The clearest difference is update cadence: AIMailMind at every 4 days against CastleKeyp's every 2 months. CastleKeyp's advantage is iOS requirement (15.1 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

CastleKeyp ships an update every 2 months, AIMailMind every 4 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
CastleKeyp versus AIMailMind: the parameters behind the verdict, then further details
ParameterCastleKeypAIMailMind
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better17.0
Further details — not scored
Size48 MB7 MB
Age rating4+4+
DeveloperCastleKeyp CorporationSingularity Games Co., Ltd.

In-app purchases

None

CastleKeyp

No in-app purchases

None

AIMailMind

No in-app purchases

Questions

Is CastleKeyp free?
CastleKeyp is free to download, with no in-app purchases.
Is AIMailMind free?
AIMailMind is free to download, with no in-app purchases.
Do CastleKeyp or AIMailMind have ads?
Neither CastleKeyp nor AIMailMind shows ads.
Which is updated more often, CastleKeyp or AIMailMind?
CastleKeyp ships an update every 2 months, and AIMailMind every 4 days. Most recently, CastleKeyp was updated on October 29, 2026 and AIMailMind on October 28, 2026.

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