proLibro vs Trace
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
proLibro
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Introducing proLibro, the ultimate destination for digital reading enthusiasts. Dive into a world where imagination knows no bounds, where every page-turn unveils new adventures, knowledge, and inspiration. Experience unparalleled convenience with our user-friendly interface, meticulously crafted to enhance your reading journey. Embrace the future of reading with our cutting-edge technology. With seamless synchronization across devices, your reading progress, notes, and annotations are always at your fingertips, allowing you to pick up right where you left off, anytime, anywhere. You’ve never searched and interacted with content like this before. Some of our key features include: • Immersive content reading experience • Powerful multi-title capable search • Ability to add annotations and notes to your content.
Trace
This app allows users to privately read and organize EPUB files downloaded from AO3 offline. It offers customizable reading settings, library management with personal tags and notes, and robust search and filtering capabilities for fanfiction.
- Offline EPUB reading
- AO3 fanfiction organization
- Customizable reading themes and fonts
- Personalized library management
- Advanced search and filtering
- Optional cloud sync
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Trace Reader is a private, unofficial reader for AO3 EPUBs. Import a story and read it comfortably offline, with the metadata and organisation fanfiction readers actually need. I built this for accessible reading tailored to offline AO3 reading because Apple Books wasn't quite enough. Choose paged or continuous scrolling, adjust the type and spacing, and read in Paper, Sepia, Night or High Contrast themes, with accessible fonts. Filter your collection with all of AO3's filters, and view your library by the things that matter for fanfiction: reading status, fandom, tags, and ships. NO AO3 LOGIN - Keep your account details private. You should never trust a third party with your AO3 login details and this app will never ask you for them. BUILD A LIBRARY THAT FEELS LIKE YOURS • Keep stories as Saved, Reading, Paused, Caught up, Finished or Dropped • Add ratings, personal tags, highlights, and notes by story, chapter or highlighted passage. • Search and filter by fandom, relationships, characters, warnings, series and more • Import individual EPUBs or choose a folder that will automatically load EPUBs once you download them from AO3. • Keep previous EPUB versions and restore one when needed NO ACCOUNT NEEDED Reading, importing and organisation work offline. Your EPUB files and story text stay on your device with no limitations on library size or organization features. TRACE SYNC IS OPTIONAL ADD ON Connect a free Trace account to sync up to 100 stories, restore library details and reading progress on a new device, and access your reading library from any browser. Trace Unlimited adds unlimited Reader sync and private reading Stats. Trace also gives you access to the Trace extension, which lets you track your online reading in the same way you track your EPUB reading, storing it all in the same online library. A subscription is never required to read, import or organise EPUBs on this device. EPUB files are not included in sync right now. Trace Reader is an independent, unofficial app. It is not affiliated with or endorsed by the Organization for Transformative Works or Archive of Our Own. End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Trace at every 2 days against proLibro's monthly. proLibro's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 16.0). On price, 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
Both are free to download. proLibro sells 6 one-off in-app purchases and Trace sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
proLibro ships an update monthly, Trace every 2 days. The most recent releases landed on September 10, 2026 and September 25, 2026 respectively.
| Parameter | proLibro | Trace |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Monthly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 55 MB | 33 MB |
| Age rating | 4+ | 12+ |
| Developer | CogniLore Inc. | ZACHARY SAMUEL LAMBERT |
In-app purchases
proLibro
- Purchase 200 proLibro Credits$2.99
- Purchase 500 proLibro Credits$6.99
- Purchase 1000 proLibro Credits$12.99
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- Purchase 2000 proLibro Credits$24.99
- Purchase 5000 proLibro Credits$64.99
- Buy 10 000 proLibro Credits$129.99
Trace
- Trace Unlimited Monthly$3.991 Month
- Trace Unlimited Yearly$39.991 Year





