Iris Drive vs SoloPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Iris Drive
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Iris Drive is private file sync for devices you control. Create a local profile or link an existing device, then browse synced files through the native Files app. Share selected folders with people you choose, keep encrypted backups, and open Iris apps from one place. Your files and cryptographic keys stay under your control. Iris Drive has no ads, analytics, or tracking.
SoloPDF
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SoloPDF is a clean, fast, fully local PDF reader — no ads, no account, nothing ever uploaded. • Reading: multiple tabs, outline, page thumbnails, full-text search, fit-width/fit-page zoom. Huge files open instantly thanks to on-demand loading. • Highlights become notes: highlight any text and the annotation is saved as a Markdown notes file (.annotations.md) right next to the PDF — open, edit, and version it with any editor (including our SoloMD). solopdf:// links inside the notes jump straight back to the highlighted passage. • Forms: fill AcroForm PDFs (text fields, checkboxes, dropdowns) and save the result. • Export to Markdown: turn a whole PDF into a Markdown document, outline headings included. • Dark mode with smart page inversion for comfortable night reading. • Interface in English, 简体中文, 繁體中文, and 日本語. Everything runs on your device. No network calls, no data collection.
Screenshots
Verdict
The clearest difference is device support: SoloPDF at 4 against Iris Drive's 2. SoloPDF also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, 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. Neither carries in-app purchases, so what you see is what you pay.
Iris Drive ships an update every 5 weeks, SoloPDF monthly. The most recent releases landed on September 21, 2026 and September 24, 2026 respectively.
| Parameter | Iris Drive | SoloPDF |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 89 MB | 14 MB |
| Age rating | 17+ | 4+ |
| Developer | Sirius Business Oy | 向东 李 |
In-app purchases
Iris Drive
No in-app purchases
SoloPDF
No in-app purchases





