Audio spectrum analyzer EQ Rta vs STL Simple Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Audio spectrum analyzer EQ Rta
This app provides real-time audio analysis and visualization for sound frequency and decibel levels. It's designed for precise audio measurement, suitable for both hobbyists and professionals tuning rooms or speakers.
- Octave Band Real-Time Analyzer
- FFT Plot
- Smooth HD Graphics
- Multispectral Harmonic Analyzer
- Integrated Sound Level Meter
- High FFT Size
- Spectrogram Mode
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Spectrum Analyzer is a powerful real-time audio analysis app. Ideal for room tuning or speaker tuning, this app provides precision audio measurement and visualization that fits in your pocket! Spectrum Analyzer has many advanced features which are normally only found in much more expensive sound analysis software. It offers fast and accurate spectrum analysis suitable for both amateur hi-fi enthusiasts and professional A/V engineers. Feature Highlights: ● Octave Band Real-Time Analyzer ● FFT Plot ● Smooth HD Graphics ● Multispectral Harmonic Analyzer ● Integrated Sound Level Meter (dB-A weightnings) ● Up to 16384 FFT size ● Various window functions ● Spectrogram mode Have any questions? Contact us at lspappscare@gmail.com
STL Simple Viewer
Easily view and interact with 3D STL CAD models. Supports various file types and offers advanced rendering options for detailed analysis. Get model information and explore interiors with clipping planes.
- View ASCII and Binary STL files
- Load STL from ZIP
- Rotate, pan, and zoom
- Orthogonal and Perspective modes
- Model info (triangle count, bounding box)
- Rendering options (faces, edges, transparency)
- Clipping plane for interiors
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STL Simple Viewer is a great app to quickly view STL, 3MF & DXF 3D files and export them to the most commonly used CAD formats. Features: - Supports STL files both ASCII and Binary formats. - Supports 3MF & DXF files. - Load files directly from ZIP archives. - Export to DXF, OBJ, DAE, PLY, USD, STL & 3MF. - Measure distances between points within your model. - Rotate, pan, and zoom models with intuitive touch controls. - Configure rendering options: faces, edges, points, background and transparency. - Render using a clipping plane (useful for viewing model interiors). - View models in Orthographic or Perspective mode. - Obtain model information including triangle count, bounding box, surface area, and volume. Privacy Policy: https://www.boviosoft.com/apps/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For support or questions: support@boviosoft.com
Screenshots
Verdict
The clearest difference is price: STL Simple Viewer at Free against Audio spectrum analyzer EQ Rta's $3.99. STL Simple Viewer also leads on ratings volume (923 vs 245). Audio spectrum analyzer EQ Rta's advantage is review sentiment (56% vs 18%) and in-app purchases (none vs 4). On 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
STL Simple Viewer is free to download; Audio spectrum analyzer EQ Rta costs $3.99 up front. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days. Audio spectrum analyzer EQ Rta asks for nothing beyond the download.
Audio spectrum analyzer EQ Rta holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 245 and 923 respectively. Written reviews point the same way: 56% of Audio spectrum analyzer EQ Rta's written reviews are positive against 18% of STL Simple Viewer's.
Audio spectrum analyzer EQ Rta ships an update every 2 months, STL Simple Viewer every 5 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.
| Parameter | Audio spectrum analyzer EQ Rta | STL Simple Viewer |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.5 (245 ratings) — better | 4.3 (923 ratings) |
| Positive reviews | 56.3% of reviews — better | 18.1% of reviews |
| Number of ratings | 245 | 923 — better |
| Update frequency | Every 2 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, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 18 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Marina Polyanskaya | Victor Bovio |
Customer experience
Audio spectrum analyzer EQ Rta
STL Simple Viewer
User reviews
Audio spectrum analyzer EQ Rta
From 245 App Store ratingsWhat we love
- 👍 Well-designed interface
- 👍 Useful for musicians
- 👍 Good for casual use
- 👍 Accurate for basic analysis
- 👍 Replaces expensive equipment
Room to improve
- 🐛 Does not work on newer iOS
- 🐛 Freezes frequently
- 🐛 Unresponsive graphs
- 🐛 No instructions
- 🐛 Help section shows errors
STL Simple Viewer
From 923 App Store ratingsWhat we love
- 🚀 Simple and intuitive viewer
- 👍 Useful viewing options
- 💡 Supports multiple file formats
Room to improve
- 🐛 Frequent crashes
- 🔋 High battery consumption
- 🚨 Excessive and intrusive ads
- 🔍 Limited functionality for larger files
Bugs and requests
Audio spectrum analyzer EQ Rta
Reported bugs
38 issues- Does not work with iPad Pro M4 and iOS 18
- Freezes all the time on newer iOS versions
- Does not respond correctly on newer iOS
- Does not work on iPhone 11
- HELP in app doesn't work, showing ERROR
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- Not working on iPhone 13 Pro Max
- Froze up, did not work
- On iOS 16, errors, almost not working
- Does not work on iPhone 14 iOS 17.1.1
- Does not appear to show spectral changes
- Bars sometimes move, sometimes don't, get stuck
- Does not work on iPad
- Not working smoothly on iOS 16.3
- Display not timely
- Doesn't work on iPhone 14Pro, latest iOS
- Works on older iPad, not on iPhone
- Shows only nonsense and freezes constantly
- Not usable after iOS 16 update
- Broken as of January 2023
- Sensitivity very low or very slow on iOS 16.2
- App crashes constantly at granular sampling settings
- Graphs unresponsive at lower sampling rates
- Spectrograph doesn't work anymore
- Whole app is useless on iPhone 14
- No input even with microphone access enabled on iOS 16
- Not working in iPhone 13
- App works only with delayed fake data on iOS 16.x
- Don't work on iPhone 12 Pro Max, iPhone 14 pro max, ios15 and ios16
- Erroneous readings, unstable, inaccurate
- Does not open on iOS 10 on an iPhone 6
- No information below 70 hertz
- Cannot select a reading below 50 Hz
- Same problem at the upper end of the audible range
- Measurement results do not match the standard
- Very slow reaction
- No differentiation below 200Hz
- Decibel meter shows 40dB in silence in Octave RTA, but 20dB in FFT Plot with same A curve
- Help section has incorrect encoding, text in hieroglyphs
Requested features
23 requests- Fix for newer iOS versions
- Add instructions
- Fix help section
- Add refund option
- Add zoom function
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- Add external microphone level data correction
- Add AUv3 support
- Add peak hold release/reset button
- Add switchable weighting filters (dB C, dB Z)
- Add ability to capture & export images
- Prevent phone from turning off while using app
- Add quarter tones
- Add manual calibration setting
- Add time-based filter
- Add more bands for detailed info
- Add calibration function
- Add subsonic range display
- Add detailed bass and treble analysis
- Add scale adjustment for vertical and horizontal axes
- Improve reaction time
- Add peak hold reset button
- Add dB C and dB Z weighting filters
- Add image export functionality
STL Simple Viewer
Reported bugs
3 issues- App crashes when opening larger STL files
- Inability to open some file formats
- Ads continue to appear even after paying for ad removal
Requested features
3 requests- Add ability to save color/lighting settings
- Improve stability and reduce crashes
- Provide an ad-free paid version
In-app purchases
Audio spectrum analyzer EQ Rta
No in-app purchases
STL Simple Viewer
- Pro version (1 week plan)$0.997 Days
- Pro version (1 month plan)3 Days trial$1.991 Month
- Remove Ads$2.99
- Export Pack$3.99
Questions
Is Audio spectrum analyzer EQ Rta free?
Is STL Simple Viewer free?
Which has better reviews, Audio spectrum analyzer EQ Rta or STL Simple Viewer?
Do Audio spectrum analyzer EQ Rta or STL Simple Viewer have ads?
Which is updated more often, Audio spectrum analyzer EQ Rta or STL Simple Viewer?
Other comparisons
