Pre vs Folio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pre
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Streamline the HVAC equipment installation process with our app designed specifically for light commercial systems. Ensure every installation adheres to Carrier's standards through a systematic verification process. With this app, contractors can submit photographic evidence of each installation step directly for admin review, enhancing job accountability and quality assurance. Simplify job tracking and validation for contractors and admins, ensuring that all installations meet industry standards. Key Features: - Comprehensive Job Tracking: Record and track every detail of active jobs including job addresses, ensuring all information is centralized and easily accessible. - In-App Photo Documentation: Capture and upload photos directly within the app at various stages of the HVAC installation process. This feature helps maintain a verifiable record of the job's progress and adherence to standards. - Job Review and Validation: Easily access and review submitted jobs. This feature allows contractors and admins to confirm that all completed jobs meet the required specifications and quality standards. - Modify Submitted Jobs: Easily comeback and update any already Submitted Job.
Folio
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Folio keeps HTML files readable, interactive, and available offline—exactly the way they were made. No developer-operated server. No Folio account. No conversion that breaks the layout. Bring in a single HTML file or a folder-based page with its referenced CSS, JavaScript, images, and data. Folio gives each page its own local origin so modern pages—including ES modules, fetch requests, and local storage—can work the way they should. BUILD YOUR LIBRARY • Import files from Files or another app's Share sheet • Import a folder-based page with its referenced supporting files • Watch a folder for new and updated pages • Optionally add and refresh selected files from Google Drive • Organize with favorites, tags, searchable icons, sorting, grouping, and library search • Update many pages at once with bulk actions READ AND USE YOUR PAGES • Stay offline by default, with network access controlled separately for each page • Navigate page history, find text, reload, inspect source, and see useful diagnostics • Choose a top or bottom toolbar that gets out of the way as you read • Download files generated by a page, print, or save and share a PDF • Use a full three-column workspace on iPad or focus on the page full screen • Open chosen pages from widgets, and favorites or recent pages from Home Screen quick actions PRIVATE BY DESIGN • No Folio account, advertising, analytics, or tracking • Optional iCloud sync uses your private iCloud database • Optional Google Drive access is limited to files you choose for Folio • Lock individual pages with Face ID or your device passcode • Locked pages are shielded in the app switcher and badged in widgets and quick actions Two included interactive samples make it easy to explore Folio immediately. Keep reports, dashboards, exported notes, archived documentation, and other web files useful wherever you go—even when the network doesn't.
Screenshots
Verdict
The clearest difference is update cadence: Folio at daily against Pre's every 2 months. Pre's advantage is iOS requirement (13.0 vs 17.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Pre ships an update every 2 months, Folio daily. The most recent releases landed on October 18, 2026 and October 10, 2026 respectively.
| Parameter | Pre | Folio |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 46 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Carrier Corporation | Brian Renshaw |
In-app purchases
Pre
No in-app purchases
Folio
No in-app purchases









