Gradient Image Generator vs CoronaSDR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gradient Image Generator
Easily create custom gradient images with CSS, SVG, or image file outputs. Adjust colors, angles, dimensions, and zoom for precise visual effects. Save directly to your device or copy code for web design.
- Generate CSS, SVG, and image gradients
- Set 2-12 custom colors and positions
- Adjust gradient orientation and angle
- Define image dimensions up to 8000 pixels
- Instant preview for precise results
- Save images or copy code to clipboard
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Gradient Image Generator generate 3 types of gradient image. CSS3 Codes, SVG Codes and Images. with instant previewing so you get exactly what you had in mind. Generate a linear gradient and save it as an image, css code or sag code. You can set the dimensions for the image, the colors, the orientation and the zoom of the gradient. Features: - Able to set number of colours from 2 to 12 - Able to set custom colour for each node - Able to set colour node position - Able to set Gradient orientation such as horizontal, vertical, 30°, 45° or custom angle - Able to set image size range from 5 to 8000 pixels in rectangular shape - Lightweight app with a small size, optimized for everyday use Saving options: - Save generate Gradient Image to camera roll - Copy generate CSS 3 Code into clipboard and paste into any html app you desire - Copy generate SVG Code into clipboard and paste into any app you desire Gradient images are used everywhere in web page design, background design. Eg, it can be use as the background buttons, html table, DIVs, to act as shadows and other interesting visual effects etc. In computer graphics, a color gradient specifies a range of position-dependent colors, usually used to fill a region. For example, many window managers allow the screen background to be specified as a gradient. The colors produced by a gradient vary continuously with position, producing smooth color transitions. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
CoronaSDR
This application allows users to connect to and control RTL-SDR servers on their local network. It provides live spectrum and waterfall displays, various demodulation modes, and DSP controls for audio filtering and signal tuning. Users can save favorite stations and adjust RF settings.
- Live spectrum and waterfall display
- Multiple demodulation modes (AM, NFM, WFM, USB, LSB, CW)
- DSP controls (squelch, AGC, filters)
- Station favorites with import/export
- RF controls (PPM, tuner options)
- Diagnostics and performance pipeline
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CoronaSDR is an iOS app for listening to rtl_tcp SDR servers over your local network. Key features: - Live spectrum and waterfall rendering - Demodulation modes: AM, NFM, WFM, USB, LSB, CW - DSP controls: squelch, AGC, audio filters, de-emphasis - Station favorites with import/export - RF controls such as PPM and tuner options (hardware/server dependent) - Diagnostics and a performance-focused pipeline No account is required. Set your rtl_tcp host and port, connect, and tune. Built by Silviu YO6SAY for the radio community.
Screenshots
Verdict
The clearest difference is review sentiment: CoronaSDR at 100% against Gradient Image Generator's 0%. CoronaSDR also leads on price (Free vs $2.99) and update cadence (every 3 weeks vs every 40 months). Gradient Image Generator's advantage is iOS requirement (13 vs 18.0). On ratings volume, 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
CoronaSDR is free to download; Gradient Image Generator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
CoronaSDR holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 5 respectively. Written reviews point the same way: 0% of Gradient Image Generator's written reviews are positive against 100% of CoronaSDR's.
Gradient Image Generator ships an update every 40 months, CoronaSDR every 3 weeks. The most recent releases landed on September 18, 2026 and September 5, 2026 respectively.
| Parameter | Gradient Image Generator | CoronaSDR |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.7 (3 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 | 5 — better |
| Update frequency | Every 40 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13 — better | 18.0 |
| Further details — not scored | ||
| Size | 2 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Nitrio | Alien Systems S.R.L. |
Customer experience
Gradient Image Generator
CoronaSDR
In-app purchases
Gradient Image Generator
No in-app purchases
CoronaSDR
No in-app purchases





