Vacuum Link vs PDFDarkMode
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Vacuum Link
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Vacuum Link installs on your Apple mobile device. It is customizable to let you select the parameters you want to control and monitor. It also offers recording and plotting capability. Data can be easily exported to your computer for display, sharing, and analysis. Connectivity is achieved through Agilent's serial/bluetooth adapter part number: X3514-68003 **Easy vacuum pump control with your mobile phone** It is easily customizable, allowing you to build a ‘Favourites’ list of the parameters you want to manage. **Smart connectivity at hand** A new way to be connected to your work: export and share device data easily and quickly **Smart features for a modern platform** Vacuum Link installs on your Apple mobile device. It allows real time monitoring of the parameters of your choice, and offers recording capability: data can be exported to your computer to be displayed and shared. Creating log files is easy and sharing them is extremely quick using the regular features available on virtually any cell phones. Log files help users review the pump parameters in a spreadsheet. Plotting parameters variations in time can be done using the dedicated icon.
PDFDarkMode
Easily convert PDFs to a comfortable dark mode with custom text and background colors. Reduce eye strain while reading or studying long documents. Save and revisit your personalized PDFs in a private library.
- Upload PDFs from device
- Customize text and background colors
- Preview dark mode changes
- Download converted PDFs
- Personal PDF library
- Private by design
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PDFDarkMode makes your PDFs easier on the eyes, day or night. Upload any PDF, choose your own text and background colors, preview your changes, and download your converted document directly within the app. Whether you’re studying, reading long-form writing, or reviewing technical documents, PDFDarkMode helps reduce eye strain and make your PDFs visually comfortable and fully personalized. Features • Upload any PDF from Files or your device • Customize text color and background color • Preview your converted PDF in full dark mode • Download it directly • Save and revisit all converted PDFs in your personal library • One-time in-app purchase to download a dark mode PDF for $2.99 • Upgrade to PDFDarkMode Pro for $9.99 to unlock unlimited dark mode PDF downloads Private by Design No logins. No analytics. No tracking. Your PDFs stay private.
Screenshots
Verdict
The clearest difference is in-app purchases: Vacuum Link at none against PDFDarkMode's 6. Vacuum Link also leads on iOS requirement (8.0 vs 15.0). PDFDarkMode's advantage is update cadence (every 4 days vs every 18 months). On price, ads 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. PDFDarkMode sells 5 one-off in-app purchases. Vacuum Link asks for nothing beyond the download.
Vacuum Link ships an update every 18 months, PDFDarkMode every 4 days. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.
| Parameter | Vacuum Link | PDFDarkMode |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 18 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 65 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Agilent Technologies, Inc | Wildcatter LLC |
In-app purchases
Vacuum Link
No in-app purchases
PDFDarkMode
- Download PDF (up to 100 pages)$0.99
- Dark Mode PDF Download2 variants$2.99
- Download PDF (up to 500 pages)$4.99
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- PDFDarkMode Pro$9.99
- Download PDF (500+ pages)$9.99









