Codename Jo vs DIARYit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Codename Jo
This voice assistant helps manage your inbox and calendar by summarizing emails, drafting replies, and scheduling events. It integrates with various work tools and can be controlled from your Apple Watch.
- Summarize emails
- Draft and send replies
- Organize messages
- Manage calendar events
- Integrate with work tools
- Apple Watch companion app
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Codename Jo is a voice assistant for your inbox, calendar and work tools. Talk to Jo to catch up on email, draft replies and manage your day. WORK THROUGH YOUR INBOX Hear summaries of your mail, ask follow-up questions, draft and send replies, and organize messages with archive and label actions. MANAGE YOUR CALENDAR Ask about your schedule and create or update events in Google Calendar. CONNECT YOUR WORK TOOLS Connect Gmail and Google Calendar, with optional connections for Slack, Notion, Granola, GitHub and custom MCP services. Available actions depend on the services you connect and their permissions. TALK FROM YOUR APPLE WATCH Use the Watch companion to start a conversation, mute your microphone or end a call. Keep your paired iPhone nearby with Codename Jo open. WHAT YOU NEED An OpenAI API key with access to the models used by Jo, a Google account for Gmail and Calendar, and an internet connection. OpenAI usage is billed separately to your OpenAI account. Microphone permission is required for voice conversations. Apple Watch is optional. YOUR DATA Your OpenAI key and connected-service credentials are stored in the device Keychain. Voice and relevant connected content are sent to the AI and service providers needed to fulfill your requests. Privacy Policy: https://kiloforge.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
DIARYit
A private, offline daily journal app that allows you to write one entry per day and revisit past entries through a calendar. Your entries are kept on your device and backed up via iCloud.
- Daily journal entries
- Calendar navigation
- Color-coded date marking
- Continuous record of entries
- Private and offline design
- iCloud backup integration
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Write what matters. Keep your days in a single stream. DIARYit is a private daily diary with one entry per day and just enough room for what you want to remember. A LITTLE SPACE. A CLEARER FOCUS. You don’t need to record everything to remember something. Each day gives you a deliberately limited writing space. Capture a moment, a thought, or what the day meant to you, without a page you feel obliged to fill. YOUR LIFE, IN ORDER Write in the present. Let the past stay as it was. Once a day has passed, its entry can no longer be edited. This is intentional. Your diary keeps what you wrote then, not what you might write now. The days ahead are visible, but you cannot write in them until they arrive. The days behind you remain there to revisit. Looking back is your choice. LOOK BACK WITH CONTEXT Find days with writing in the calendar and jump directly to an entry. Press and hold a date with writing to mark it green, yellow, red, or leave it unmarked. Give each day a meaning of your own. PRIVATE. SIMPLE. YOURS. No account to create. No ads, social features, or streaks to maintain. Your writing is stored on your device. Write and read available entries offline, in a quiet interface that follows your device’s light or dark appearance. Your entries can be included in your iPhone’s iCloud Backup when backup is enabled for DIARYit. This is device backup, not live syncing between devices. START WITH TODAY Write today’s entry and read your most recent past entry for free. An optional Access subscription unlocks your full history. Scroll through earlier days or return to an entry from the calendar. Choose monthly or yearly. Your saved entries are not deleted when your subscription ends. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: DIARYit at 5.0 against Codename Jo's 1.0. DIARYit also leads on iOS requirement (15.0 vs 26.4). Codename Jo's advantage is in-app purchases (none vs 2) and update cadence (every 5 days vs every 3 weeks). On price, ratings volume, ads 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. DIARYit sells 2 in-app purchases, starting at $3.99 per month. Codename Jo asks for nothing beyond the download.
DIARYit holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Codename Jo ships an update every 5 days, DIARYit every 3 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Codename Jo | DIARYit |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 5 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 26.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 110 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Petaforge Inc. | Seunghoon Baek |
Customer experience
Codename Jo
DIARYit
In-app purchases
Codename Jo
No in-app purchases
DIARYit
- Monthly$3.991 Month
- Yearly$34.991 Year









