ChatInbox vs SecondBrain Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChatInbox
This app reimagines your email by organizing it around people, not dates. View all conversations with a contact in a chat-style format, making it easy to find past messages and attachments. It supports multiple email accounts and devices, offering a streamlined inbox experience.
- Contact-centered inbox
- All accounts in one inbox
- Smart contact grouping
- Attachments by person
- Calendar view
- Email reminders
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In a traditional inbox, emails from the people who matter most get buried under everything else. ChatInbox puts people first — grouping every message by contact, so each person's conversation is always one tap away. Tap a contact. See everything you've ever exchanged — messages, attachments, history — all in one clean, chat-style view. No more hunting through a chronological pile of unread mail to find that one message from your client, your accountant, or your kid's school. If you've ever wished email worked like iMessage — but for every account, every provider, all in one place — ChatInbox is what you've been looking for. CONTACT-CENTERED INBOX Every email is grouped by sender. Your contact list shows the most recent conversation first, each person appearing only once. Open a contact to see your full history, displayed as a natural back-and-forth conversation. UNIFIED ACCOUNTS Connect Gmail, Outlook, iCloud, and any IMAP account. All your email, all your contacts, one inbox — synced across iPhone, iPad, and Mac. SMART CONTACT GROUPING ChatInbox automatically groups related contacts — airlines, hotels, online shopping, subscriptions — so you can manage entire categories of email at once. CALENDAR EMAIL FILTER Browse your inbox by date using the built-in calendar view. Find any message from any day without searching. VISUAL ORGANIZATION Tag and organize emails on a Kanban board. Track what needs attention, what's waiting for a reply, and what's done. REMINDERS & NOTIFICATIONS Set custom reminders on any email. Get notified about messages that matter and let the rest wait. MARKDOWN COMPOSER Write polished emails with built-in Markdown formatting. Style text clearly without wrestling with toolbars. PRIVACY FIRST Your emails stay on your devices. ChatInbox connects directly to your mail servers — no third-party servers, no data mining, no tracking. Previously used Unibox and miss email grouped by sender? ChatInbox carries that vision forward — rebuilt from the ground up for modern Apple platforms, with features Unibox never had. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
SecondBrain Pro
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Your Personal AI-Augmented Memory SecondBrain helps you capture, organize, and recall your thoughts, ideas, and learnings using voice-first capture and AI-powered search. INSTANT VOICE CAPTURE • Tap to record, automatic transcription • Works on iPhone, Apple Watch, iPad • Background recording for long thoughts • Premium Neural TTS for voice playback AI-POWERED RECALL • Natural language search: "What did I learn about React last week?" • On-device AI chat with your memory context • Temporal queries: "yesterday", "last month", "last summer" • Smart tagging and categorization CHOOSE YOUR STORAGE FREE - Local Only • Store memories on your device • Voice capture with standard TTS • On-device AI chat (10 memory context) • Perfect for getting started STANDARD - CHF 7.99 (One-Time) • Everything in Free + • iCloud Sync across all your Apple devices • Premium Neural TTS voices • Expanded AI context (50 memories) • Export to JSON/Markdown • iPhone ↔ iPad ↔ Watch ↔ Mac sync PREMIUM - CHF 17.99 (One-Time) • Everything in Standard + • Custom CloudFlare Worker backend • AI Auto-Correction of voice input • AI Summarization of search results • Quality Boosting for better relevance • GDPR compliant, EU servers PRIVACY-FIRST • No account required (Free & Standard tiers) • On-device AI processing (iOS 26+ Apple Intelligence) • Optional bring-your-own-backend (Premium) • End-to-end encrypted sync (iCloud) • You own your data, always KEY FEATURES • Voice recognition in multiple languages • Real-time transcription overlay • Memory types: Note, Task, Learning, Decision, Discovery • Tag-based organization • Temporal search ("today", "last week", "last year") • Export your data anytime • Dark mode support • Apple Watch companion app PRICING • FREE: 100 local memories • STANDARD: CHF 7.99 (iCloud Sync, unlimited) • PREMIUM: CHF 17.99 (CloudFlare AI, unlimited)
Screenshots
Verdict
The clearest difference is update cadence: ChatInbox at every 5 days against SecondBrain Pro's every 2 months. 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. ChatInbox sells 3 in-app purchases, starting at $2.99 per month and SecondBrain Pro sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
ChatInbox ships an update every 5 days, SecondBrain Pro every 2 months. Both last shipped on September 17, 2026.
| Parameter | ChatInbox | SecondBrain Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (29 ratings) — better | — |
| Positive reviews | 61.8% of reviews | — |
| Number of ratings | 29 — better | — |
| Update frequency | Every 5 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 45 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Innovatism LLC | Heinrich Krupp |
In-app purchases
ChatInbox
- Premium Monthly14 Days trial$2.991 Month
- Premium Yearly14 Days trial$19.991 Year
- Premium Lifetime$24.99
SecondBrain Pro
- Standard$7.99
- SecondBrain PREMIUM$17.99









