Kase₄ vs FluidDocs
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
FluidDocs
Transform your documents into an interactive knowledge base. Ask natural language questions and get instant, grounded answers directly from your imported files, even without an internet connection. Ideal for professionals who need quick access to information from technical manuals, research papers, and reports.
- Offline document Q&A
- Import PDFs, Markdown, code, text
- Natural language questioning
- Answers grounded in document text
- Privacy-first design
- Conversation history
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FluidDocs turns your documents into answers — even when you’re offline. Supported on iPhone 15 and newer. Field manuals, research papers, technical PDFs, reports — they’re full of answers, but finding them when you need them is hard. FluidDocs lets you import your documents and ask natural questions, then gives clear, grounded answers based only on what’s in your files. Built for real-world work, FluidDocs is designed for people who don’t always have reliable connectivity: * Field technicians * Engineers * Researchers * Healthcare, energy, construction, and industrial teams Once documents are imported, you can ask questions offline and trust the responses are based on your actual content. How it works: 1. Import PDFs, Markdown, code, or text files 2. FluidDocs indexes your documents locally 3. Ask questions in natural language 4. Get answers grounded in the document — no guessing 5. When an answer isn’t clearly available, FluidDocs tells you and suggests better questions based on what is in the document. Privacy-first by design: * Your documents stay on your device * No accounts required * No tracking * No silent uploads of your files Key features: * Intelligent document search and chunking * Natural language Q&A grounded in document text * Offline-friendly workflows * Conversation history per document * Clean, focused interface designed for clarity Who it’s for: If you’ve ever downloaded a large document “to read later” and then couldn’t find what you needed when it mattered — FluidDocs is for you. FluidDocs helps you work with your documents the way you think — directly, clearly, and on your terms.
Screenshots
Verdict
Kase₄ and FluidDocs both sit at 5.0 stars, but that hides the real split: 100% of FluidDocs's written reviews are positive against 0% of Kase₄'s. FluidDocs also leads on price (Free vs $9.99) and in-app purchases (none vs 4). Kase₄'s advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.2). On rating, ratings volume and ads 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
FluidDocs is free to download; Kase₄ costs $9.99 up front. Kase₄ sells 4 one-off in-app purchases. FluidDocs asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Kase₄ against 5.0 for FluidDocs. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews are what separate them: 0% of Kase₄'s written reviews are positive against 100% of FluidDocs's.
Kase₄ ships an update every 2 months, FluidDocs daily. Both last shipped on October 24, 2026.
| Parameter | Kase₄ | FluidDocs |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 5.0 (2 ratings) | 5.0 (2 ratings) |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 2 |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 17 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Kenneth Wong | Artiste, LLC |
Customer experience
Kase₄
FluidDocs
In-app purchases
Kase₄
- Tip: Dollar$1.00
- Tip: Coffee$2.00
- Tip: Coffee, CA$4.00
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- Tip: Caffè Mocha$5.00
FluidDocs
No in-app purchases









