Comparison

Kase₄ vs Solo

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

Head to head
About

Kase₄

This app allows you to create and manage your own personal databases on your device. It offers flexibility in designing structures to track anything important, with features like inter-linked data, full-text search, and various field types. Your data remains private and accessible offline.

Highlights
  • Design custom databases
  • Inter-linked data
  • Full-text search with NLP
  • Multiple field types
  • Markdown support
  • Passcode and biometric lock
  • Data visualization (Formatters)
  • OCR for text recognition
Features
Read full description

Kase exists because it should. There should be a database app that can go anywhere with you. It should be: • Simple — Using it should be easy and intuitive, • Flexible — Once familiar with the basics, you can design any database to track anything important to you, and • Relational — Inter-linked data is an order of magnitude more useful. Plus, you don't want to repeat yourself. Additionally, it should be: • Personal — You should not need to worry about who can peek into your data, and • Always Available — High-speed wireless network should *not* be a prerequisite for accessing your own data. Structured data at your fingertips. Something like that didn't exist, so I started creating Kase in 2014. Basic Concepts: • Your Kase contains Boxes. • Each Box stores Decks that can relate to each other. • A Deck collects similarly structured Cards. • And a Card is where you put data Entries. Features: • Pick, assign, and organize with Categories, Tags, and Marks. • Search by name, notes, full text, or keywords: Full-text indexing with Natural Language Processing. • Highlight any Box, Deck, Card, Entry, or Keyword. • Deck definitions support inheritance! • Field types include Text, Number (with Unit), Money (with Currency), Date/Time (with Time Zone), Choice, Boolean, Link, Picture, and Document. - complete with multi-level auto-conversion • Write in Markdown and see rich formatted text. • Box can be locked with a passcode, and unlocked with Face ID or Touch ID. • Formatters (Fx) to visualize data in different ways without altering the data one bit. e.g. Unit Converter, NameMapper, WordScrambler, ICU Transformers... • Side-by-Side: Compare Cards easily by displaying in columns. • On-device Text Recognitions (OCR) for multiple languages. • Import/Export in CSV, JSON, or KASE. • Complete Backup & Restore. • iPad Multitasking support: Split View, Slide Over, etc. • Very customizable UI with custom locales What Kase Can't Do: - Cloud sync is not done yet (stay tuned...) What Kase Can Do: > From Data to Wisdom > Data ▹ Information ▹ Knowledge ▹ Wisdom 1. Store Data — the objective truths. 2. Organize Information — to reflect circumstances and current condition. 3. Systematically retrieve Knowledge — utilized for decision-making. 4. And that hopefully enables you to grasp Wisdom, comprehend insights, and ultimately create value. There are databases that belong to the Big Guys. The rest of them should stay personal. By now, you should realize how valuable your data is. So why give it away? Kase keeps your data yours. See www.wisd.com/kase for more details. Terms of Use (EULA): https://www.wisd.com/kase/eula

About

Solo

This app functions like a personal chat to save thoughts, links, photos, and to-dos. It automatically organizes your saved items into smart categories and allows you to set reminders. Sync your notes across multiple devices for seamless access.

Highlights
  • Personal chat interface for saving notes
  • Automatic categorization of saved items
  • Reminders for important messages
  • Rich link previews
  • Photo and image saving
  • Cross-device synchronization
Features
Read full description

Solo is the simplest way to save anything that comes to mind. Think of it as a chat — but just with yourself. Text a thought. Drop a link. Snap a photo. Solo captures it all in a familiar messaging interface, so saving things feels as natural as sending a text. SMART SORTING, ZERO EFFORT Solo automatically categorizes your messages into smart views: • Bookmark — Links and articles to read later • To-do — Tasks and action items • Idea — Creative sparks and inspiration • Shopping — Things to buy • Money — Expenses and financial notes • Reservation — Bookings and appointments No folders to create. No tags to manage. Just send, and Solo handles the rest. NEVER FORGET Set reminders on any message so the important stuff comes back to you at the right time. EVERYTHING IN ONE PLACE • Text notes and quick thoughts • Links with rich previews • Photos and images • Checklists and to-dos PRIVATE & SECURE Your messages are encrypted on-device. Solo is built with privacy at its core — your thoughts stay yours. SYNC ACROSS DEVICES Sign in to sync your messages across iPhone, iPad, Mac, and the web. Start a thought on your phone, pick it up on your laptop. SOLO PRO Unlock custom labels, and more ways to organize — your way. Solo is free to use. No account required to get started. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Kase₄4 screens
Solo4 screens

Verdict

The call

The clearest difference is price: Solo at Free against Kase₄'s $9.99. Solo also leads on update cadence (every 3 days vs every 2 months) and iOS requirement (13.0 vs 15.0). On rating, ratings volume, 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

Solo is free to download; Kase₄ costs $9.99 up front. Kase₄ sells 4 one-off in-app purchases and Solo sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Kase₄ against 5.0 for Solo. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Kase₄ ships an update every 2 months, Solo every 3 days. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 6 level
Kase₄ versus Solo: the parameters behind the verdict, then further details
ParameterKase₄Solo
Price$9.99Free — better
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews0.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 2 monthsEvery 3 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFreemium — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size17 MB49 MB
Age rating4+4+
DeveloperKenneth WongOOTH

Customer experience

Kase₄

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Solo

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Kase₄

One-time4
  • Tip: Dollar$1.00
  • Tip: Coffee$2.00
  • Tip: Coffee, CA$4.00
Show 1 more
  • Tip: Caffè Mocha$5.00
2 purchases

Solo

Subscriptions2
  • Pro Monthly14 Days trial$1.991 Month
  • Pro Yearly14 Days trial$19.991 Year

Questions

Is Kase₄ free?
Kase₄ costs $9.99, and also offers in-app purchases.
Is Solo free?
Solo is free to download, with in-app purchases available.
Which has better reviews, Kase₄ or Solo?
Kase₄ and Solo are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Kase₄ or Solo have ads?
Neither Kase₄ nor Solo shows ads.
Which is updated more often, Kase₄ or Solo?
Kase₄ ships an update every 2 months, and Solo every 3 days. Most recently, Kase₄ was updated on October 24, 2026 and Solo on October 10, 2026.

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