Comparison

x vs Santellissi

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

Head to head
About

x

Features
Read full description

x-Cal is an ergonomic scientific calculator, in both portrait and landscape orientations, using RPN (c) Great for professional and educational use, it allows to quickly develop an understanding of register operations and basic programming Features fixed, scientific or engineer number formats, trigonometric and hyperbolic calculations in radians, degrees or grades, basic statistical computations, linear correlations, combinations, etc. Swipe on the top result display area to view the arithmetic register stack, tap on the top to display other registers such as storage register, statistical registers and program steps Record programs such as a quadratic equation solver, or display graphs to visualize functions y = f(x) At any time look, copy and paste text style computations into e-Mails, notes, etc.

About

Santellissi

Features
Read full description

Santellissi 3.0 — A Sanctuary for Books, Learning, and Reflection Welcome to Santellissi, a reading and study environment that brings together books, Scripture, document tools, personal notes, and an AI companion. Explore Your Library Discover the Great Books Explorer and organize your reading experience. Import PDF documents, open books, and navigate through their pages in a dedicated reading environment. Read and Study Scripture Explore the Bible through Santellissi's reading tools. Import additional PDF editions and keep your study materials together in one place. Build Your Personal Collection of Passages Select passages, save bookmarks, capture portions of documents, and add your own notes and reflections. Return to important readings through your annotated collection. Prepare Books with the Bookbinder Combine PDF documents, split facing-page scans, adjust page formats, and use supported on-device text recognition to make scanned material easier to work with. Meet Brother Lumi Visit the AI Sanctuary, where Brother Lumi provides a conversational space for questions, exploration, and reflection. Santellissi includes controls for interacting with a GGUF-based AI engine, including response continuation and speech playback. A Place to Read, Think, and Explore Whether you are studying literature, examining Scripture, organizing documents, or experimenting with AI-assisted conversation, Santellissi brings these activities into one learning environment. Welcome to Santellissi — your digital sanctuary for reading and discovery. **Santellissi 2.0 — Read, Study, Reflect, and Create** Santellissi brings sacred reading, document study, personal annotations, and an offline AI study companion together in one place. Originally inspired by the idea of a “holy ellipsis”—connecting passages scattered across different books and chapters—Santellissi has grown into a reading and study workspace for students, teachers, preachers, researchers, and curious readers. **Explore Catholic Scripture and Documents** - Browse Catholic Bible editions and other included reading materials. - Import PDF books and documents from Files. - Search within documents and navigate matching passages. - Zoom, read, and select material for closer study. **Create Your Own Annotated Notebook** - Capture passages and page images from your reading. - Assign references to your selections. - Add personal commentary, questions, and reflections. - Organize study selections into a document. - Export annotated work for sharing, printing, or further study. **Meet Brother Lumi** Brother Lumi is an AI companion powered by a local GGUF language model. Ask questions, explore ideas, and practice conversation without sending your prompts to a remote AI service. Brother Lumi supports typed interaction, spoken responses, and multilingual language practice. Speech recognition and voice features may depend on device capabilities and available language resources. **Built for Learning** Santellissi combines a PDF reader, page cropping, annotations, document preparation, and AI-assisted discussion in a single learning environment. Whether you are preparing a lesson, studying Scripture, practicing another language, or gathering passages for a presentation, Santellissi helps you turn reading into meaningful work. Santellissi is an independent educational application. AI-generated answers may contain errors and should be checked against authoritative sources, especially for theological or historical questions.

Screenshots

x4 screens
Santellissi4 screens

Verdict

The call

The clearest difference is update cadence: x at fortnightly against Santellissi's every 2 months. On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

x ships an update fortnightly, Santellissi every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 5 level
x versus Santellissi: the parameters behind the verdict, then further details
ParameterxSantellissi
PriceFreeFree
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad — better
Requires iOS18.017.0 — better
Further details — not scored
Size1 MB1.2 GB
Age rating4+4+
DeveloperFMILLETLuis Acevedo-Arreguin

In-app purchases

None

x

No in-app purchases

None

Santellissi

No in-app purchases

Questions

Is x free?
x is free to download, with no in-app purchases.
Is Santellissi free?
Santellissi is free to download, with no in-app purchases.
Do x or Santellissi have ads?
Neither x nor Santellissi shows ads.
Which is updated more often, x or Santellissi?
x ships an update fortnightly, and Santellissi every 2 months. Most recently, x was updated on October 30, 2026 and Santellissi on October 31, 2026.

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