AstroPup Horizon vs Image FFT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AstroPup Horizon
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AstroPup Horizon allows rapid and accurate capture of your local horizon, using your iPhone or iPad's on-device Neural Engine. No need to capture individual points, just capture a panorama and let machine learning determine figure it out. Magnetometer calibration gets a boost if you include the sun in your image; we'll improve calibration with astrophysics. If needed, make surgical edits or repaint the horizon line within the app. After capture, you can export the data astronomy software such as N.I.N.A., Stellarium, Cartes du Ciel, and SkySafari, and our own AstroPup Sky.
Image FFT
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Run a 2D Fast Fourier Transform on your camera feed, or on photos loaded from your camera roll. - Adjustable thresholds: Adjust the low and high threshold levels with sliders at the top of the screen - Adjustable resolution: Choose from Low (128²), Medium (256²), or High (512²). - Save the FFT output side-by-side with the processed image. This app is 100% offline, and processes no data in the cloud.
Screenshots
Verdict
The clearest difference is price: AstroPup Horizon at Free against Image FFT's $1.99. Image FFT's advantage is iOS requirement (18.6 vs 26.0). On update cadence, 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
AstroPup Horizon is free to download; Image FFT costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
AstroPup Horizon ships an update every 10 days, Image FFT weekly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.
| Parameter | AstroPup Horizon | Image FFT |
|---|---|---|
| Price | Free — better | $1.99 |
| Update frequency | Every 10 days | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 18.6 — better |
| Further details — not scored | ||
| Size | 115 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Aaron Freimark | Emma Sinclair |
In-app purchases
AstroPup Horizon
No in-app purchases
Image FFT
No in-app purchases
