Solid Diary vs Quadrix
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solid Diary
This private journal app offers AI-powered insights into your thoughts and emotions. Secure your entries with encryption and biometric locks. Organize your reflections with formatting, tags, and unlimited uploads of images, voice, and sketches.
- 100% private and encrypted diary
- AI analysis for deeper insights
- Unlimited image, voice, and sketch uploads
- Formatting and tagging for organization
- Customizable themes
- Stats and achievements
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No subscriptions - Buy once, keep forever End your day with a moment of calm reflection. Solid Diary is more than just a journal app - it could be your sanctuary. Dive deep into your thoughts, and with the unique AI analysis, reveal deeper insights into yourself and the complex world around us. - 100% private diary What you write about in Solid Diary is for your eyes only. This diary is designed with privacy in mind and this is why your data is encrypted and only you can access it. You can also lock your diary with a biometric lock. - AI analysis Keeping a diary is a great way to explore your thoughts and better understand your emotions. But when you need an extra opinion, you can ask for an AI analysis and get a deeper understanding of the meaning behind your writing. - Unlimited uploads You can upload as many images, voice recordings and sketches as you need - Formatting and tags You can apply various formatting options to each entry and stay organized with tags. - Themes Solid Diary supports 4 different themes so you can pick the one that suits your style most. - Stats and achievements To make keeping a diary even more fun, there are achievements and stats that you unlock on your journey. Are you ready to start keeping your diary? Solid Diary is a universal app available on iOS, iPadOS, and macOS You can choose to unlock just this app or all 5 Solid Apps with one purchase Terms of service: http://solidapps.co/terms.html Privacy policy: http://solidapps.co/privacy.html
Quadrix
This productivity app helps users prioritize tasks using a matrix-based system. It offers features like reminders, calendar integration, and file attachments to streamline workflow and enhance organization for students, professionals, and entrepreneurs.
- Eisenhower Matrix prioritization
- Task and project management
- Reminders and calendar view
- Attach voice notes, images, files
- Quick search, print, preview
- Distraction-free interface
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Quadrix is inspired by the Eisenhower Matrix, making prioritizing effortless and stress-free. Focus on what truly matters with a clean, distraction-free interface designed for students, professionals, and entrepreneurs. Add tasks and projects instantly, set reminders, view calendar, manage multiple projects, attach voice notes, images, and files, and quickly search, print, or preview your priorities. Simple yet powerful—plan smarter, work efficiently, and stay organized without unnecessary clutter.
Screenshots
Verdict
The clearest difference is monetization model: Quadrix at free against Solid Diary's paid. Quadrix also leads on update cadence (fortnightly vs every 2 months). Solid Diary's advantage is ratings volume (26 vs 2). On price, rating, 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
Both are free to download. Solid Diary sells 2 one-off in-app purchases and Quadrix sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for Solid Diary against 5.0 for Quadrix. That said, the two scores are not equally well evidenced: Solid Diary has 26 ratings behind it against 2, so its average is the more settled of the two.
Solid Diary ships an update every 2 months, Quadrix fortnightly. The most recent releases landed on September 23, 2026 and September 6, 2026 respectively.
| Parameter | Solid Diary | Quadrix |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (26 ratings) | 5.0 (2 ratings) |
| Positive reviews | 86.4% of reviews | — |
| Number of ratings | 26 — better | 2 |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 44 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | Solid Apps S.R.L. | Learnzy, LLC |
Customer experience
Solid Diary
Quadrix
In-app purchases
Solid Diary
- Unlock this app (lifetime)$4.99
- Unlock ALL 10 Solid Apps (lifetime)$9.99
Quadrix
- Quadrix$1.99





