Comparison

ONSTA vs Private Diary & Lock

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

Head to head
About

ONSTA

Features
Read full description

ONSTA is your AI-powered wellness and beauty companion. With a photo, get an AI-powered analysis of your skin, hands, and overall wellness — with personalized recommendations. FEATURES: - AI Face, Hand & Body Scans — analysis of your skin age, stress, recovery, and vitality indicators - Daily Vitality Dashboard — track your progress with streaks and smart insights - Smart Water Tracker — personalized hydration goals informed by your profile and local weather - Local Weather & UV Alerts — know when to protect your skin - Multilingual — full support for English, Arabic, and Russian - Secure & Private — your photos are used only to generate your personal results Your health. Your beauty. Your world — all in one station. Terms of Use (EULA): https://api.onsta.ai/terms.html Privacy Policy: https://api.onsta.ai/privacy.html

About

Private Diary & Lock

This app provides a private digital journal experience where all entries are stored locally on your device. It offers daily prompts, voice-to-text input, photo attachments, and robust search capabilities. An optional upgrade unlocks advanced features like biometric lock, AI tidying, and PDF export.

Highlights
  • Daily writing prompts
  • Voice-to-text input
  • Photo and location attachments
  • Local storage and iCloud backup
  • Searchable journal entries
  • Optional AI writing assistance
  • PDF export
Features
Read full description

Your personal diary, and nobody else’s. No account, no ads, and nothing leaves your phone unless you ask. Write about your day, add a photo, track your mood, and keep it all. 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. • A diary with a lock: Face ID, Touch ID or a passcode, with Scriptum Complete. WRITE IT YOUR WAY • A line or a thousand words, whatever the day needs. • Make it a photo diary: add a picture to remember the day by. • A simple mood tracker: tap one of five faces for how the day felt. • Note where you were, when that is part of it. • Missed a day? Open the calendar and write it whenever you like. • Light or dark paper, to suit the hour. • Stuck for words? A prompt is there if you want one. • A gentle reminder at the time you choose, which eases off instead of nagging when you have been away. ON YOUR HOME SCREEN • The widget shows the date and whether you have written today. • It never shows a word you wrote. That stays inside. FIND IT AGAIN YEARS LATER • Search everything you have ever written. • Every photo in your diary in one place, month by month, and every voice note too. • A calendar of the days you wrote, and the days you did not. • Open any date and read it exactly as you left it. AND STILL IMPOSSIBLE TO LOSE • A copy of your diary is kept in your own iCloud, so deleting the app does not take 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. • Coming from Day One or Daylio? Bring your entries with you. ON IPHONE AND IPAD • On iPad your diary is laid out as a single sheet of paper, with room to write. • Each device keeps its own diary, and you can bring your iPhone’s pages across. SCRIPTUM COMPLETE An optional upgrade, for when the free diary is not enough. Try it free for a week. • Lock your diary behind Face ID, Touch ID or a passcode. • Speak instead of typing, and have a rambling entry tidied into something you will want to reread. • Keep voice notes on a page, and hear the day again in your own voice. • Up to ten photos on a page, arranged for you. • Every sticker pack, and ink to sketch over the paper. • Colour the whole app to suit you. • Turn your diary into a printable book, typeset page by page. Scriptum Complete is a monthly or yearly subscription. The yearly plan starts with a free week for new subscribers. Payment is charged to your Apple Account when the free week ends, or at purchase without one. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and can be managed or cancelled in your Apple Account settings. Terms of Use: https://annrstudio.com/scriptum/terms/ Privacy Policy: https://annrstudio.com/scriptum/privacy/

Screenshots

ONSTA4 screens
Private Diary & Lock4 screens

Verdict

The call

The clearest difference is device support: Private Diary & Lock at 3 against ONSTA's 1. Private Diary & Lock also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases 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. ONSTA sells 2 in-app purchases, starting at $29.99 per month and Private Diary & Lock sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

ONSTA ships an update every 3 days, Private Diary & Lock every 5 days. The most recent releases landed on October 29, 2026 and November 6, 2026 respectively.

Scorecard2 real differences · 8 level
ONSTA versus Private Diary & Lock: the parameters behind the verdict, then further details
ParameterONSTAPrivate Diary & Lock
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 3 days — betterEvery 5 days
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size62 MB48 MB
Age rating4+4+
DeveloperHELCOO AI Developing Services L.L.C S.O.CANNR Studio

In-app purchases

2 purchases

ONSTA

Subscriptions2
  • ONSTA Unlimited Monthly$29.991 Month
  • ONSTA Unlimited Yearly$299.991 Year
3 purchases

Private Diary & Lock

Subscriptions2
  • Monthly$2.991 Month
  • Yearly7 Days trial$22.991 Year
One-time1
  • Lifetime$34.99

Questions

Is ONSTA free?
ONSTA is free to download, with in-app purchases available.
Is Private Diary & Lock free?
Private Diary & Lock is free to download, with in-app purchases available.
Do ONSTA or Private Diary & Lock have ads?
Neither ONSTA nor Private Diary & Lock shows ads.
Which is updated more often, ONSTA or Private Diary & Lock?
ONSTA ships an update every 3 days, and Private Diary & Lock every 5 days. Most recently, ONSTA was updated on October 29, 2026 and Private Diary & Lock on November 6, 2026.

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