Penzu vs Opal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Penzu
This app provides a secure and private space for journaling, note-taking, and storing personal thoughts. It offers robust security features like password and PIN locks, encryption, and cloud syncing across devices. Users can also add photos and tags to their entries, making it a comprehensive digital diary.
- Unlimited journaling
- Cloud sync for free
- Password and PIN locks
- Journal encryption
- Add photos to entries
- Search and tag entries
- Offline writing
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*Used by over 1 million people around the world *Best free journal in any app store *Syncs to the web and other mobile platforms for free Penzu is the most popular free diary, journal and notepad. It’s the best place to keep your most private thoughts safe and secure. Sync your journals to Penzu where your notes are accessible from almost any device in the world. So simple and fun that you’ll leave your paper diary behind! FEATURES *Unlimited journaling *Sync journals with Penzu cloud for free *Customize your journal covers *Lock journals with a password *Encrypt your journals *Add photos *Lock app with a PIN *Search journals *Add tags *Write offline and more... WHY PENZU? Penzu is a diary and personal journal that is focused on privacy. With a unique and compelling user experience, it makes writing online as easy and intuitive as writing on a pad of paper. PRIVACY Your journal and your thoughts aren’t always meant to be shared — some things are supposed to be private! Use Penzu to jot down whatever you want. Then lock your journal with a password (or even encryption) so no one can read it but you! Furthermore, you can lock the entire app with a PIN in the event that someone gets access to your mobile device. PENZU Unlike other journal apps, Penzu has a web-based counterpart. So you can access your journals and diary from any web browser and other devices. Penzu is constantly being updated and improved so that the writing experience is effortless and reliable. SUBSCRIPTION INFO This app is free to download but requires a free Penzu account in order to start writing. Upgrading to Penzu Pro is available for a small monthly or yearly subscription. Your subscription will auto-renew unless you cancel manually. Monthly subscriptions are $4.99 USD and renew every month. Yearly subscriptions are $19.99 USD and renew every year. You can see our privacy policy here: http://penzu.com/m/privacy You can read our terms of use here: http://penzu.com/m/terms
Opal
This private journaling app uses AI to help you understand your thoughts and emotions. It offers guided prompts, ambient soundscapes, and the ability to write, speak, or add photos to your entries. AI tools analyze your writing to reveal patterns and insights, all while prioritizing your privacy with on-device storage.
- AI-powered pattern analysis
- Guided journaling journeys
- Voice and image entry support
- Multiple journal organization
- On-device privacy controls
- Prompt-based or blank page entries
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Opal is a guided journal and diary to delve deeper: why you react the way you do, what you actually want, what your dreams keep trying to show you. Pick a guide from a large free library, follow a ten day series, or open a blank page and write whatever is on your mind. A FREE LIBRARY OF GUIDES Browse guides on finding clarity, purpose and direction, relationships, attachment styles, limiting beliefs, Stoic philosophy, gratitude, and more. Each guide walks you through a sequence of questions, with an example answer beside every prompt so you always have somewhere to begin. TEN DAY SERIES When you want a longer practice, start a series. Shadow Work spends ten days with the parts of yourself you usually avoid, from the inner critic to the golden shadow. Deep Manifest helps you name the desire underneath the goals you keep setting. The Dreaming Life teaches you to record your dreams and follow the figures and images that keep returning. A new day appears on your home screen each morning, and each one builds on what you wrote before. GUIDED AUDIO JOURNALING Some pages open with a short recorded practice. Press play, close your eyes, and let a memory or an image surface. When the audio ends, write about what came up and where you felt it in your body. Ambient soundscapes are there too, for when you want rain or low tones behind your writing. WRITE YOUR WAY Type, talk, or write by hand. Voice entries are saved as tapes you can replay, each with a transcript you can read back. Add photos to any entry, and keep separate journals for the different threads of your life. CONNECT DOTS ACROSS TIME Opal reads across your entries and shows you what it finds: recurring themes, emotional patterns, relationship dynamics, dream symbols. Each week, month, and year it assembles a reflection drawn from your own words, shows you the passages it relied on, and keeps it in your archive. You can also ask your journal a question and get an answer grounded in what you actually wrote. PRIVATE BY DESIGN Your writing is stored on your device. No account required, no cloud sync by default, no data sold. Lock Opal with a password. When you use an AI feature, names, places, and other identifying details are masked on your phone before anything is sent, and you decide how much context is shared. Your entries are never used to train AI models. Export or delete them whenever you like. ENDORSED BY THERAPISTS "Opal encourages deep self-expression and deep self-acceptance while also giving tools for change." Leanne Domash, Ph.D., Psychologist and Author Opal is free to download, with a free library of guides. Opal Premium unlocks [premium features]. Start with one prompt tonight. Questions: opaljournal@gmail.com Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Opal at 100% against Penzu's 52%. Opal also leads on rating (5.0 vs 4.2). Penzu's advantage is in-app purchases (none vs 1) and ratings volume (2.5K vs 38). On price, update cadence, 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. Opal sells 1 in-app purchase, starting at $7.99 per month. Penzu asks for nothing beyond the download.
Opal holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Penzu has 2.5K ratings behind it against 38, so its average is the more settled of the two. Written reviews point the same way: 52% of Penzu's written reviews are positive against 100% of Opal's.
Penzu ships an update weekly, Opal every 2 weeks. Both last shipped on October 30, 2026.
| Parameter | Penzu | Opal |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (2.5K ratings) | 5.0 (38 ratings) — better |
| Positive reviews | 51.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 2.5K — better | 38 |
| Update frequency | Weekly — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 18.1 |
| Further details — not scored | ||
| Size | 62 MB | 359 MB |
| Age rating | 9+ | 4+ |
| Developer | Penzu Inc. | Darby Tarlow |
Customer experience
Penzu
Opal
Bugs and requests
Penzu
Reported bugs
3 issues- Keyboard disappearing during use
- Entries not saving or syncing properly
- Inability to access account after updates
Requested features
4 requests- More customization options for fonts, themes, and layouts
- Ability to export/backup journal entries
- Improved mobile app stability and features
- Better customer support and communication
Opal
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Penzu
No in-app purchases
Opal
- Premium Monthly7 Days trial$7.991 Month









