Comparison

Chat PDF Summary vs Sigmy

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

Head to head
About

Chat PDF Summary

Features
Read full description

PDF Summary AI: Chat PDF turns any document into answers, summaries, flashcards and quizzes — with sources. Stop scrolling through long documents. Add a PDF, a Word file, a web link or a scan from your camera, and ask anything. Every answer cites the page it came from, so you can trust it. Get an instant TL;DR summary, study with flashcards and test yourself with a quiz. Built for students, researchers and busy professionals. CHAT WITH ANY DOCUMENT Ask questions in plain language and get precise answers with the exact page and passage. Chat with one file or with a whole folder at once. INSTANT SUMMARIES One tap gives you a title, a TL;DR, the key points and the takeaways of the entire document. FLASHCARDS AND QUIZZES 12 question-and-answer cards and an 8-question quiz with explanations, generated from your file. SMART TOOLS Highlights, insights, timeline, glossary, questions, outline and facts — each in one tap. WORKS WITH EVERYTHING PDF, Word (.docx), text, Markdown and RTF files, web articles, and scanned or photographed pages (text is recognized on your device). FAST OR QUALITY Choose Fast for quick answers or Quality for our most capable AI on hard questions. PRIVATE BY DESIGN Your documents stay on your device. Only the text needed to answer your question is sent, encrypted, and never stored. CHAT PDF PLUS Chat PDF Plus is available as a weekly subscription with a 3-day free trial or as a yearly subscription. It unlocks unlimited documents, chats, summaries, flashcards, quizzes and Quality mode, subject to our fair use policy. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. If you are looking for a pdf summary app, a chat pdf assistant, an AI summarizer or a TLDR tool for documents, this is the app for you. Privacy Policy: https://privacy.owltaps.com Terms of service: https://privacy.owltaps.com/terms

About

Sigmy

Features
Read full description

Sigmy is a fully on-device AI assistant. The language model, document search, and every piece of private text stay on your iPhone or iPad. No cloud. No account. No tracking. No training on your data. Ever. WHY SIGMY IS DIFFERENT • Runs a Google Gemma model locally on your device — no API keys, no subscriptions to external AI services, and no network round-trips that can leak your content. • Works offline, on a plane, in a tunnel, or in a sensitive workplace where cloud AI is banned. • Your documents, chats, and questions never leave your device. We cannot read them and neither can anyone else. WHAT YOU CAN DO • Ask questions about your PDFs, Word docs, text files, Markdown, and scanned images — every answer cites a tappable source passage. • Import documents by tapping +, scanning with the camera, capturing text from photos, pasting images, or sharing from any other app. • Compare two or more documents side-by-side — "what's different between these contracts?", "which proposal has better terms?". • See comparison answers as clean tables when the model formats them that way. • Tap suggested follow-up questions after each answer to dig deeper with one tap. • Extract events from any document straight to your Calendar — meeting dates, deadlines, travel itineraries. • Hands-free mode: have Sigmy read answers aloud in your choice of voice — fully on-device. • Dictate questions by voice and export chats as PDF, Markdown, plain text, RTF, or email. • Search your chat history to find past conversations instantly. • Full-text search across every document you've imported, with semantic ranking that understands what you meant. • Quick-prompt templates for executive summaries, action items, study outlines, and timelines. PRIVACY BY DESIGN • Optional Face ID / Touch ID unlock for the whole app. • Optional AES-GCM encryption of the document index at rest, sealed whenever you background the app. • Privacy manifest declares every iOS API we touch and why. • PII detection warns you before indexing credit card numbers or other sensitive identifiers. FREE TRIAL — 7 DAYS OF EVERYTHING Every new install gets a 7-day free trial with full Pro features: unlimited documents, extended memory window, and all advanced tools. No credit card required. SIGMY PRO After the trial, Sigmy Pro unlocks: • Unlimited document imports and queries • Extended memory window for long files • All advanced tools and future Pro features at no extra cost THREE WAYS TO SUBSCRIBE • Pro Monthly — $5.99/month after a 7-day free trial • Pro Yearly — $39.99/year after a 14-day free trial (saves ~50% vs monthly) • Lifetime Pro — one-time $79.99, permanent access, no renewals SUPPORTED DOCUMENT TYPES PDF, Word (.docx), plain text (.txt), Markdown (.md), Rich Text (.rtf), HTML, CSV, and images containing text (via on-device OCR). DEVICE REQUIREMENTS iPhone or iPad with sufficient RAM for on-device AI. Sigmy adapts memory settings automatically to your device. The language model (~3.4 GB) is included in the app — no separate download after install. Works fully offline once installed. — SUBSCRIPTION TERMS Sigmy Pro is an auto-renewable subscription. • Pro Monthly: $5.99 per month after a 7-day free trial. • Pro Yearly: $39.99 per year after a 14-day free trial. • Lifetime Pro: one-time $79.99 non-renewing purchase. Payment will be charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscription in Settings → Apple Account → Subscriptions. Privacy Policy: https://www.sigmygroup.com/privacy Terms of Use: https://www.sigmygroup.com/terms

Screenshots

Chat PDF Summary4 screens
Sigmy4 screens

Verdict

The call

The clearest difference is update cadence: Sigmy at every 2 weeks against Chat PDF Summary's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Chat PDF Summary sells 6 in-app purchases, starting at $5.99 per 7 days and Sigmy sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Chat PDF Summary ships an update every 8 months, Sigmy every 2 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

Scorecard1 real difference Ā· 5 level
Chat PDF Summary versus Sigmy: the parameters behind the verdict, then further details
ParameterChat PDF SummarySigmy
PriceFreeFree
Update frequencyEvery 8 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details — not scored
Size9 MB3.2 GB
Age rating4+4+
DeveloperJose SaponSIGMY GROUP PTY LTD

In-app purchases

6 purchases

Chat PDF Summary

Subscriptions2
  • Plus Weekly3 Days trial$5.997 Days
  • Plus Yearly$49.991 Year
One-time4
  • Premium Version$2.99
  • Small Credits Pack$4.99
  • Medium Credits Pack$6.99
Show 1 more
  • Large Credits Pack$8.99
3 purchases

Sigmy

Subscriptions2
  • Pro Monthly7 Days trial$5.991 Month
  • Pro Yearly14 Days trial$39.991 Year
One-time1
  • Lifetime Pro$79.99

Questions

Is Chat PDF Summary free?
Chat PDF Summary is free to download, with in-app purchases available.
Is Sigmy free?
Sigmy is free to download, with in-app purchases available.
Do Chat PDF Summary or Sigmy have ads?
Neither Chat PDF Summary nor Sigmy shows ads.
Which is updated more often, Chat PDF Summary or Sigmy?
Chat PDF Summary ships an update every 8 months, and Sigmy every 2 weeks. Most recently, Chat PDF Summary was updated on October 26, 2026 and Sigmy on October 28, 2026.

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