Tone Gen Pro vs smartDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tone Gen Pro
Create various audio signals, including single tones, sweeps, and merged sounds, with extensive parameter control. Ideal for students, musicians, educators, and audio professionals exploring sound.
- Generate single type signals (sine, square, noise)
- Create sweep (chirp) signals (linear/exponential)
- Generate click signals with adjustable duty cycle
- Merge multiple tones and sweeps
- Frequencies up to 20 kHz
- Extensive parameter control
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Generate audio signal of different shapes with many parameters and options. You can generate frequencies up to 20 kHz of audio signal. If you are curious student about sound after a physics class, music instruments hobbyist/professional, a teacher, or a professional in audio equipment, this app is for you ! You can generate: - Single type signal (sinusoidal, square, noise, etc) - Sweep (chirp) signal (linear or exponential) - Click: ON-OFF sine wave with any duty cycle and ON frequency - Merged sound of any number of tones or sweeps
smartDF
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iPadOS application designed in cooperation between certified developer Carlos Lago and Rhotheta International Inc - www.rhothetaint.com - for the remote control and monitoring of Rhotheta radio direction finders via Bluetooth (BLE) or Wi-Fi. A modern UI for direction finder (DF) products increases crew productivity and enhances mission awareness during search-and-rescue, law enforcement, and special missions. DF sensor data is conveniently displayed over maps with state-of-the-art graphics.
Screenshots
Verdict
The clearest difference is in-app purchases: smartDF at none against Tone Gen Pro's 1. smartDF also leads on update cadence (weekly vs every 3 months). Tone Gen Pro's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 15.4). On price and ads 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. Tone Gen Pro sells 1 one-off in-app purchase. smartDF asks for nothing beyond the download.
Tone Gen Pro ships an update every 3 months, smartDF weekly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Tone Gen Pro | smartDF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (48 ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 48 — better | — |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 12.0 — better | 15.4 |
| Further details — not scored | ||
| Size | 44 MB | 59 MB |
| Age rating | 12+ | 4+ |
| Developer | Ibrahim Al-Sammarraie | Carlos Yordanis Lago Gonzalez |
In-app purchases
Tone Gen Pro
- Tone Gen Pro Full$1.99
smartDF
No in-app purchases
