DVS vs Image to PDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DVS
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The DVS Control app can be used in conjunction with with the DVS Control Unit. The app uses sophisticated software for the use with smart phones, tablets and computers (PC & Mac). By using the DVS Control app you can connect your DVS Control Unit to your wireless network. Once connected you can remotely access the settings of the unit, set alarm notifications and view live sensor readings. For example, if for any reason the oxygen concentration falls below a set point, you will receive an alarm (push notification) to your device. Using the DVS Control app you are able to remotely view how your system is performing. For example, check when the unit was last cleaned. You may also adjust the settings of the control unit, such as the duration of cleaning intervals. Main Features: - Remotely access the DVS Control Unit. - Receive alarms. - View live performance data. - Easily adjust settings. - View temperature, pH and Oxygen %. - Pond water level control
Image to PDF
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Create, edit, and sign PDFs on the go. PDF Composer is your all-in-one PDF editor, scanner, and converter. Easily turn images, documents, or scans into PDFs, then edit, mark up, sign, and share them from your iPhone or iPad. Key Features: Convert & Create PDFs • Turn images, scans, and documents into PDF files • Combine multiple pages into a single PDF • Import from Files, Photos, or your camera Edit & Annotate • Draw, highlight, and add comments to any page • Edit, adjust, and apply filters • Use Apple Pencil for precision on iPad Sign Documents • Add digital signatures with your finger or stylus • Save your signature for quick reuse Scan to PDF • Use your camera to scan documents • Enhance with image filters Export & Share • Save to device or share via email, cloud, or messages • All files are stored locally for maximum privacy Download PDF Composer today and handle all your PDF tasks effortlessly, anywhere. Privacy Policy: https://pdfcomposerapp.github.io/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: DVS at none against Image to PDF's 3. DVS also leads on iOS requirement (11.0 vs 17.5). Image to PDF's advantage is update cadence (fortnightly vs every 3 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. Image to PDF sells 3 in-app purchases, starting at $2.99 per 7 days. DVS asks for nothing beyond the download.
DVS ships an update every 3 months, Image to PDF fortnightly. The most recent releases landed on October 18, 2026 and October 8, 2026 respectively.
| Parameter | DVS | Image to PDF |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.5 |
| Further details — not scored | ||
| Size | 36 MB | 25 MB |
| Age rating | 4+ | 17+ |
| Developer | Senect GmbH & Co. KG | Kiryl Kaveryn |
In-app purchases
DVS
No in-app purchases
Image to PDF
- Unlimited access3 Days trial$2.997 Days
- Unlimited access$3.991 Month
- Unlimited access$17.991 Year









