Zone 2 Buddy vs Private Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zone 2 Buddy
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Zone 2 Buddy is an app that will give you real-time feedback based on your zone 2 max heart rate. The watch application plays a sound or vibrates when your heart rate goes above zone 2 max to assist in zone 2 training.
Private Diary
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Scriptum is a daily journal with no account and no server. Your writing stays on your phone, and nothing leaves it unless you ask it to. ONE PAGE A DAY • A question is waiting each morning, so you never open to a blank page. • Write a line or a thousand words. The day is one page, of any length. • Missed a day? Open the calendar and write it whenever you like. WRITE HOWEVER SUITS YOU • Type, or speak and watch your words land on the page. • Add a photograph to remember the day by. • Note where you were, when that is part of it. FIND IT AGAIN YEARS LATER • Search every entry you have ever written. • A calendar of the days you wrote, and the days you did not. • Open any date and read it exactly as you left it. PRIVATE, NOT MERELY ENCRYPTED • No account. Nothing to sign up for, nothing to sign in to. • No analytics, no trackers, no advertising inside the app. • Most diaries keep your writing on a server. This one has no server to keep it on. AND STILL IMPOSSIBLE TO LOSE • A copy of your journal is kept in your own iCloud, so deleting the app no longer takes it with it. • Nothing is sent to us. The copy sits in your iCloud Drive, where you can see it. • Or save the whole diary, words and photographs, as one file only you hold. SCRIPTUM COMPLETE An optional upgrade, for when the free journal is not enough. • Lock your diary behind Face ID, a fingerprint, or a passcode. • Up to ten photos on a page, arranged for you. • Sketch over the paper in ink. • Stickers to decorate a page, every pack of them. • Have a rambling entry tidied by AI into something you will want to reread. • Colour the whole app to suit you. • Turn your journal into a printable PDF book, typeset page by page. Scriptum Complete is offered monthly or yearly, or as Lifetime, a one-off purchase. Subscriptions renew automatically until cancelled. Lifetime does not renew. Terms of Use: https://annrstudio.com/scriptum/terms/ Privacy Policy: https://annrstudio.com/scriptum/privacy/
Screenshots
Verdict
The clearest difference is in-app purchases: Zone 2 Buddy at none against Private Diary's 3. Private Diary's advantage is update cadence (weekly vs every 2 months) and iOS requirement (15.1 vs 18.0). On price, 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. Private Diary sells 3 in-app purchases, starting at $2.99 per month. Zone 2 Buddy asks for nothing beyond the download.
Zone 2 Buddy ships an update every 2 months, Private Diary weekly. The most recent releases landed on September 18, 2026 and September 17, 2026 respectively.
| Parameter | Zone 2 Buddy | Private Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 1 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | Anderson Day | ANNR Studio |
In-app purchases
Zone 2 Buddy
No in-app purchases
Private Diary
- Monthly$2.991 Month
- Yearly$17.991 Year
- Lifetime$34.99
Questions
Is Zone 2 Buddy free?
Is Private Diary free?
Do Zone 2 Buddy or Private Diary have ads?
Which is updated more often, Zone 2 Buddy or Private Diary?
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