Comparison

Eris. vs PDF On

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

Head to head
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.

About

PDF On

Features
Read full description

PDF On turns paper into clean PDFs and lets you finish them right away: fill in, sign, highlight, share. Everything happens on your iPhone. No account, no upload, no tracking. SCAN AND CREATE • Scan documents with automatic edge detection • Take a photo and crop it: the edges are found and straightened for you • Build PDFs from photos, files and other PDFs • Convert Word, Excel, PowerPoint, Pages, Numbers, Keynote, text and HTML files to PDF • Choose page size, layout (1, 2 or 4 per page) and quality • Optional date and time stamps • Make PDFs searchable with on-device text recognition • Protect PDFs with a password FILL IN AND SIGN • Tap a form field and type: the text lands inside the box, on the line • Return jumps to the next field • Checkmarks snap into checkboxes, dates follow the format of the form • Your name, address and phone number appear as suggestions above the keyboard • Sign by drawing, or photograph your signature on paper • Place a passport photo on an application form: the photo frame is found automatically • Typefaces, sizes, bold and colors for every language MARK UP • Highlighter, pen with thickness and opacity, lines, arrows, rectangles and circles • Undo and redo READING MODE • Full screen with trimmed margins, so the text is larger • Highlight with one swipe, in four colors of your choice • Name your colors, for example "Important" or "Question", and add notes • A list of all highlights with page jump; share them as text • The app remembers where you stopped reading ID CARD AND PASSPORT COPY • Front and back on one sheet in true original size • Optional enlargement, grayscale, cut lines and a watermark such as "Copy for landlord" PAGES • Reorder, rotate, crop, straighten and delete pages • Merge PDFs, insert scans, photos or other PDFs • Export the text as a Word document (.docx), copy text, search in the document PRIVATE BY DESIGN • Works fully offline • No account, no ads, no tracking, no data collection • Optional app lock with Face ID • Share extension: send photos and PDFs from other apps to PDF On LANGUAGES English, Spanish, German, French, Arabic, Persian, Urdu and more than 40 other languages, with full right-to-left layout.

Screenshots

Eris.4 screens
PDF On4 screens

Verdict

The call

Eris. and PDF On are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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.

ScorecardNo meaningful differences
Eris. versus PDF On: the parameters behind the verdict, then further details
ParameterEris.PDF On
PriceFreeFree
Rating4.3 (6 ratings) — better—
Positive reviews80.0% of reviews—
Number of ratings6 — better—
Update frequencyEvery 2 weeks—
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size34 MB11 MB
Age rating4+4+
DeveloperIgnacio PalacioAbbas Hoseiny

In-app purchases

None

Eris.

No in-app purchases

None

PDF On

No in-app purchases

Questions

Is Eris. free?
Eris. is free to download, with no in-app purchases.
Is PDF On free?
PDF On is free to download, with no in-app purchases.
Do Eris. or PDF On have ads?
Neither Eris. nor PDF On shows ads.

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