Comparison

Sandbook vs Eris.

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

Head to head
About

Sandbook

This app converts text into natural-sounding speech using an on-device model. Read ePub, PDF, and TXT files, type or paste text, or even read webpages aloud. Export audio files for offline listening with complete privacy.

Highlights
  • On-device text-to-speech
  • Reads ePub, PDF, TXT files
  • Type or paste text
  • Read webpages aloud
  • Export audio files
  • Privacy protection
Features
Read full description

Sandbook reads books, documents and articles aloud in natural voices, entirely on your iPhone or iPad. Nothing you read is uploaded, and there is no account, no subscription and no ads. NATURAL VOICES, OFFLINE - 41 voices in American and British English, Spanish, French, Italian, Brazilian Portuguese and Hindi - A book in Spanish, French, Italian, Portuguese or Hindi opens with a voice in its language - Powered by the open-source Kokoro model, running locally; no internet connection needed - Follow along as each spoken word is highlighted - Speed from 0.5x to 2.5x; each book remembers its voice and speed READ ALMOST ANYTHING - Import EPUB, PDF, Word (.docx), TXT, RTF, Markdown and HTML files - Add a web page by pasting a link, or share it from Safari - Scan printed pages with the camera, or pick a photo, and listen - Send files or selected text from any app with the share sheet, or type and paste your own - Open a document straight from the Files app with Open With, or set Sandbook as its default app LISTEN THE WAY YOU READ - Opens at the paragraph where you stopped - Keep listening when you leave the book, with a mini player at the bottom of the screen - Bookmarks, and search inside a book - Sleep timer: stop after a set time or at the end of the chapter - Passages you've already heard play back instantly - In a PDF, the sentence being read is highlighted on the page; tap any sentence to read from there - Reading options: light, sepia and dark themes, fonts, text size and line spacing - Appearance: light, dark or matching your system - See each book's length, listening time and the time left in the chapter - Prepare a chapter's audio ahead of time, then keep listening with the screen locked; prepared chapters replay instantly - Continue Reading with Siri or the Shortcuts app - Export any text as an M4A audio file ACCESSIBILITY - VoiceOver, Voice Control, Switch Control, larger text and contrast improvements - The app is available in English, Spanish, French, Italian, Portuguese (Brazil) and Hindi PRIVATE BY DESIGN Your books, text and voices stay on your device. Sandbook never sends what you read to a server. GOOD TO KNOW - Voices require iPhone 12 or later, or an iPad with an A14 or M1 chip or later. Sandbook also needs iOS 18.2 or later. - Real-time reading pauses when the screen locks. To listen with the screen off, prepare the chapter first. Questions or ideas: support@sandbook.app

About

Eris.

Experience private AI conversations entirely on your device. This app offers offline access to multiple AI models, ensuring your data never leaves your iPhone or iPad. Enjoy fast, secure AI assistance without internet connectivity or subscriptions.

Highlights
  • 100% Private conversations
  • No internet required
  • Multiple AI models supported
  • Optimized for Apple Silicon
  • One-time download, use forever
  • Dark Mode support
  • Haptic feedback
Features
Read full description

Eris brings the power of AI conversation to your iPhone and iPad while keeping your privacy intact. Unlike cloud-based AI assistants, Eris runs entirely on your device using Apple's cutting-edge MLX framework. KEY FEATURES: • 100% Private - All conversations stay on your device • No Internet Required - Chat with AI completely offline • Multiple AI Models - Choose from Llama, Qwen, DeepSeek, and more • Lightning Fast - Optimized for Apple Silicon performance • No Subscriptions - One-time download, use forever • Dark Mode Support - Easy on your eyes • Haptic Feedback - Tactile responses for better interaction SUPPORTED MODELS: • Llama 3.2 (1B, 3B) - Meta's efficient language models • Qwen 2.5 Series - Multilingual capabilities • DeepSeek R1 - Advanced reasoning • Gemma 2, Phi 3.5, Mistral - Various specialized models • Code Models - For programming assistance PRIVACY FIRST: Your conversations never leave your device. No cloud servers, no data collection, no tracking. What you say to Eris stays with Eris. REQUIREMENTS: • iPhone XS/XR or newer (A12 chip required) • iOS 17.6 or later • 2-8GB storage per model Perfect for users who want AI assistance without compromising privacy. Whether you're brainstorming ideas, getting help with code, or just having a conversation, Eris is your private AI companion. Note: First launch includes a one-time model download. Models are stored locally for offline use.

Screenshots

Sandbook4 screens
Eris.4 screens

Verdict

The call

The clearest difference is rating: Sandbook at 4.6 against Eris.'s 3.4. Sandbook also leads on ratings volume (126 vs 10) and update cadence (weekly vs every 2 weeks). On price, review sentiment, 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

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

ReceptionRating · Positive reviews · Number of ratings

Sandbook holds the better App Store score, 4.6 against 3.4. That said, the two scores are not equally well evidenced: Sandbook has 126 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 78% of Sandbook's written reviews are positive against 80% of Eris.'s, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Sandbook ships an update weekly, Eris. every 2 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
Sandbook versus Eris.: the parameters behind the verdict, then further details
ParameterSandbookEris.
PriceFreeFree
Rating4.6 (126 ratings) — better3.4 (10 ratings)
Positive reviews77.8% of reviews80.0% of reviews — better
Number of ratings126 — better10
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.217.6 — better
Further details — not scored
Size271 MB34 MB
Age rating4+4+
DeveloperSmashMelon LLCIgnacio Palacio

Customer experience

Sandbook

All ratings107 ratings
Positive86.9%
Neutral7.5%
Negative5.6%
Written reviews27 reviews
Positive77.8%
Neutral14.8%
Negative7.4%

Eris.

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

None

Sandbook

No in-app purchases

None

Eris.

No in-app purchases

Questions

Is Sandbook free?
Sandbook is free to download, with no in-app purchases.
Is Eris. free?
Eris. is free to download, with no in-app purchases.
Which has better reviews, Sandbook or Eris.?
Sandbook is rated higher. Sandbook averages 4.6 out of 5 from 126 ratings, while Eris. averages 3.4 from 10 ratings.
Do Sandbook or Eris. have ads?
Neither Sandbook nor Eris. shows ads.
Which is updated more often, Sandbook or Eris.?
Sandbook ships an update weekly, and Eris. every 2 weeks. Most recently, Sandbook was updated on October 25, 2026 and Eris. on October 24, 2026.

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