Under Trees vs cal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Under Trees
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Under Trees is a simple and secure private online diary app that helps you record your daily journal, secrets, journey, mood, and any private moments. It is a private diary with pictures, tags, free and customizable themes, mood tracking, affirmations, font, etc. to make your personal diary more vivid and safe. With Under Trees your privacy will be guaranteed. All must go with your permission and confirmation. The app supports setting a diary password to protect the security of your memories and private journal. Along with it, if you forgot your password to access your diary, it's very easy to gain back your access. No more longing for the reset password email. Under Trees is also a collaborative diary. It means you can create a collaborative journaling amongst couples, families, and friends. It's a great way to connect with others and share your thoughts and experiences. The app was designed to be simple and user friendly, allowing you to add or browse the whole of your diary quickly and easily. And bellow are all what will make it your choice: Multiple diaries First app ever supports multiple diaries. You can create separate diaries for your private life, work, et... in one app. Collaborative diary Easy to create a collaborative journaling amongst couples, families, and friends! Never lose data Even if you lose your phone or forget to back it up. Under Trees securely stores your data in the cloud, backed by Google. Your privacy With the passcode and fingerprint, no one can read your diary. If you forget your password there is a recovery function. Tags Manage your diary neatly and easily with the tag system: #love, #work... Search Search your entire diary in a second with keyword, date, tag search. Photo, audio You can insert images into the article, or you can draw your own! (Media package) Entry templates Don't know what to write? Start with a template. You can create your own templates too. Affirmations Boot your day with affirmations. Create and manage your own. Nice themes Many theme themes for you to choose from, all free, you can create your own theme. UI friendly Simple and easy to use, focused on the writing experience! Simple Onboarding Just login with your Google or Apple account, start writing the first entry after installation. Affordable price Free, Text or Media, find the plan that's right for you with cheapest price! Term of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://en.undertrees.app/privacy-policy.html
cal
Capture and revisit your daily memories with photos and notes. This app presents your month as a visual calendar, allowing you to easily view past moments. Your data remains private and stored solely on your device.
- Add photos to any day
- Jot down notes for each entry
- View month as a photo calendar
- Full-screen view of daily memories
- Export entries for sharing
- Private, on-device storage
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Life moves fast. CalDiary helps you slow down and remember it — one photo, one day at a time. Add a photo to any day, jot a little note, and watch your month fill up with memories. The calendar view lets you see your whole month at a glance — every day a tiny window into your life. Tap any day to see your photo full-screen, with your note tucked underneath just the way you wrote it. What you can do: * Add a photo to each day — from your library or straight from your camera * See your whole month as a photo calendar at a glance * Tap any day for a full-screen photo and your personal note * Export your month view or a single day to keep or share Your memories stay yours. No accounts, no cloud, no servers. Everything lives on your phone — completely private, always. Free forever. No ads. No subscriptions. Just your days. Clean, minimal, and made for the little moments worth remembering.
Screenshots
Verdict
The clearest difference is in-app purchases: cal at none against Under Trees's 8. Under Trees's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 26.4). On price, update cadence and ads 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. Under Trees sells 8 in-app purchases, starting at $0.99 per month. cal asks for nothing beyond the download.
Under Trees ships an update every 8 days, cal every 10 days. The most recent releases landed on September 15, 2026 and September 23, 2026 respectively.
| Parameter | Under Trees | cal |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 8 days — better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 26.4 |
| Further details — not scored | ||
| Size | 93 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | Lang Hoang | Begimay Ahmatova |
In-app purchases
Under Trees
- Text only plan (One month)$0.991 Month
- Media plan (One month)$2.991 Month
- Text only plan -75%$3.991 Year
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- Text only plan -50%$5.991 Year
- Media plan -75%$9.991 Year
- Text only plan$11.991 Year
- Media plan -50%$17.991 Year
- Media plan (One year)$35.991 Year
cal
No in-app purchases









