DeltaV CHARM DEWD vs Linear Interpolation Master
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DeltaV CHARM DEWD
Diagnose and wire DeltaV CHARMs using your mobile device's camera. Scan CHARM LEDs to understand blink patterns or scan labels for wiring diagrams. Quickly access information, save favorites, add notes, and share with colleagues.
- Scan CHARM LED blink patterns
- Scan CHARM labels for text recognition
- Instantly understand blink pattern meanings
- Swiftly find associated wiring diagrams
- Browse and search for results
- Store results as Favorites
- Create or edit Notes
- Share information with colleagues
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The DEWD abides helping you diagnose and wire DeltaV CHARMs. Using the camera on your mobile device, intuitively scan the CHARM LED to instantly understand the meaning of the blink pattern or scan the CHARM Label for text recognition to swiftly find the associated wiring diagram. You can quickly understand why a CHARM LED is flashing or efficiently view a CHARM’s wiring diagram. You can also browse or search for results instead of scanning. For any given result, you can store it as a Favorite, Create or Edit (existing) Notes, or Share in context with a colleague.
Linear Interpolation Master
This tool simplifies linear interpolation calculations for industrial commissioning engineers. It features large, easily readable numbers for field use and allows for quick swapping of coordinate systems, such as converting between 4-20mA and 0-100% scales.
- Large number display for field visibility
- Quickly swap X and Y coordinates
- 4-20mA to 0-100% conversion
- 0-100% to 4-20mA conversion
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A linear interpolation calculator designed for industrial commissioning engineers. It has the following features: - Displays large numbers for when you are out in the field commissioning. - Allows quickly swapping x and y coordinates; for example from 4-20mA -> 0-100% to 0-100% -> 4-20mA.
Screenshots
Verdict
The clearest difference is rating: Linear Interpolation Master at 4.7 against DeltaV CHARM DEWD's 4.1. Linear Interpolation Master also leads on ratings volume (176 vs 14) and device support (3 vs 1). DeltaV CHARM DEWD's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price, review sentiment and update cadence 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. Linear Interpolation Master sells 3 one-off in-app purchases. DeltaV CHARM DEWD asks for nothing beyond the download.
Linear Interpolation Master holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: Linear Interpolation Master has 176 ratings behind it against 14, so its average is the more settled of the two. Written reviews point the same way: 56% of DeltaV CHARM DEWD's written reviews are positive against 63% of Linear Interpolation Master's.
DeltaV CHARM DEWD ships an update every 4 months, Linear Interpolation Master every 5 months. The most recent releases landed on June 1, 2026 and September 22, 2026 respectively.
| Parameter | DeltaV CHARM DEWD | Linear Interpolation Master |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (14 ratings) | 4.7 (176 ratings) — better |
| Positive reviews | 55.6% of reviews | 62.5% of reviews — better |
| Number of ratings | 14 | 176 — better |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 64 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Emerson Process Management | VERVE TECHNOLOGIES PTY. LTD. |
Customer experience
DeltaV CHARM DEWD
Linear Interpolation Master
In-app purchases
DeltaV CHARM DEWD
No in-app purchases
Linear Interpolation Master
- Generous Tip$2.99
- Massive Tip$3.99
- Amazing Tip$4.99
Questions
Is DeltaV CHARM DEWD free?
Is Linear Interpolation Master free?
Which has better reviews, DeltaV CHARM DEWD or Linear Interpolation Master?
Do DeltaV CHARM DEWD or Linear Interpolation Master have ads?
Which is updated more often, DeltaV CHARM DEWD or Linear Interpolation Master?
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