The short answer is: any phone you bought after 2019 is probably fine. The detailed answer matters because tennis recording is hard on a phone — long continuous video capture, high data rates, hot weather, big files at the end. A phone that's "good enough for everyday" can become "the recording stopped at minute 38" on a court. Below: the practical minimum specs for AceSense (and any tennis-AI app), specific phone models that clear the bar, what fails, and what to skip if you're shopping. None of this is a marketing flex — these are the constraints I see in our error logs.

TL;DR

iOS: iPhone 11 or newer. iOS 14+.
Android: Pixel 5+, Galaxy S10+, OnePlus 8+, comparable era. Android 11+.
Camera: 1080p at 30 fps minimum.
Storage: 2 GB free per match (more if 4K, but don't shoot 4K).
Battery: ≥3500 mAh or a power bank.
Network: 4G/LTE for casual; Wi-Fi for upload.

What "minimum" really means

A phone has to do four jobs for tennis AI:

Record stably for 60–120 minutes. Long continuous capture without thermal throttling.
Capture clean 1080p video. A modern AI pipeline can fix a lot, but it can't fix a smeary low-light sensor.
Hold enough storage for the video plus the OS overhead.
Upload reliably. Background-task support, decent radio, modern OS.

Any phone meeting the floor below clears all four. Older or budget phones often fail on (1) — thermal throttling — or (3) — full storage halts the recording.

The floor: iOS

iPhone 11 / 11 Pro / 11 Pro Max (2019). Rear camera shoots 1080p/30 fps cleanly. iOS 14+ supported. Battery is the weakest link on the standard 11; bring a power bank for matches over 75 minutes.

iPhone SE (2nd gen, 2020). Works. Smaller battery; expect to charge between sets.

iPhone 12 and newer. Comfortably above the bar. Standard recommendation.

Below the bar: iPhone X, XS, XR. They can record, but iOS 17/18 isn't fully supported on the older units, and the AceSense iOS app's minimum is iOS 14 — the X family is on iOS 16 max for some, and the camera pipeline is older. We see crashes and dropped frames on these models.

The floor: Android

Pixel 5 (2020). Solid baseline. Pixel cameras are well-tuned for daylight 1080p. Android 11+.

Samsung Galaxy S10 / S10+ (2019). Works. Camera is good; the Exynos vs Snapdragon split is a wash for video.

OnePlus 8 / 8 Pro (2020). Works.

Pixel 6, 7, 8 / Galaxy S20 onwards. Comfortably above the bar.

Below the bar: Samsung A-series phones from before 2021, budget Xiaomi/Realme phones with sub-flagship cameras. The AceSense app installs and runs, but the recording quality and thermal behaviour produce poorer analysis. Not a hard block — a soft warning.

The forum thread "Will SwingVision still work with an Android?" has Android users describing similar pain on older mid-range phones — the issue is universal, not app-specific.

Camera details that actually matter

Resolution. 1080p at 30 fps. Period. Higher resolutions don't help the AI; they just make files bigger. 60 fps does help marginally for serve speed, but at the cost of doubling the file size — usually not worth it.

Lens. The standard wide camera (1x) is the right one. Don't use the ultra-wide — court geometry distorts and shot localization gets less accurate. Don't use the telephoto — you lose the corners of the court.

Stabilization. OIS (optical image stabilization) helps. EIS (electronic) helps a bit too. Most flagships from 2019+ have one or both.

Auto-exposure. Modern phones lock auto-exposure on a moving subject — good. Cheaper phones hunt — bad. If you see the brightness pulsing during playback, the camera is hunting.

Storage

A 90-minute 1080p video is roughly 4–6 GB. Leave 2 GB headroom for OS overhead and the chance of a longer match. If you're at 99% storage, the recording will fail.

Two practices:

Clear last session before recording new. Habit. Open Photos, delete the file you've already uploaded.
Keep the phone at <80% full if you record more than once a week.

Battery

Quick reference for 90-minute 1080p continuous record:

Phone	Approx drain
iPhone 14 Pro / 15 / 16	25–30%
iPhone 11 / 12	35–45%
Pixel 8 / Galaxy S23	25–35%
Pixel 5 / Galaxy S10	40–50%
iPhone SE 2	50–60%

If you start at 100%, almost any qualifying phone will get through one match. If you're recording back-to-back sessions, bring a power bank — see the equipment list for filming a tennis match in 2026.

Network

The upload is where users feel the pain. A 5 GB video over a 50 Mbps Wi-Fi takes about 13 minutes. Over 4G LTE, it can take 30–60 minutes and burn through a daily data cap. Over Wi-Fi at home, it's a non-event.

The AceSense Android and iOS apps use Firebase Storage with chunked, resumable uploads — a dropped connection mid-upload picks up where it left off. SwingVision and other apps have similar resume support. The right rule is still "wait until you're home and on Wi-Fi."

What about Apple Watch?

If you've heard that SwingVision pairs with an Apple Watch for line-calling, the question is whether you need one for AceSense. Answer: no. AceSense does not use the Apple Watch — analysis is video-only and the workflow runs on the phone alone. (If you want the watch-side line-calling feature specifically, that's still a SwingVision-only thing today; we cover the trade-off in AceSense vs SwingVision.)

What about Android tablets / iPads for recording?

Don't. Tablets can record, but their cameras lag behind the phone you already own from the same year. They're heavy on a tripod and prone to wind issues. Use a phone for recording, and use a tablet for the post-match review (the PDF coaching report reads great on an iPad).

What about GoPro / DSLR / dedicated cameras?

This deserves its own post — there's an "I-8" inferred-question we'll write to. For the minimum-phone question: AceSense currently accepts video uploaded from a phone, where the phone has captured the original. If you've shot on a GoPro and offloaded to a phone, you can upload from there too — but the phone-camera path is the optimized one.

The OS-version reality

Both apps drift their minimum OS versions forward over time. As of early 2026:

AceSense iOS: minimum iOS 14, recommended iOS 16+.
AceSense Android: minimum Android 11, recommended Android 13+.

If you're on a phone that can't update past iOS 13 / Android 10, we don't support it today, and the upgrade path is a new phone. That's the real "minimum" — not the model name, but whether the OS is current enough.

What I'd buy if I were buying today (mid-2026)

For a player who isn't a phone enthusiast and just wants the cheapest viable option:

iOS: used iPhone 12. Around €300–€400. Comfortably above every threshold for the next 2–3 years.
Android: used Pixel 7 or current-gen Pixel "a" series. Around €350. Best Android camera pipeline at the price.

Don't buy a phone for AceSense. Buy a phone that's good enough for everyday and use it for AceSense. That's the whole budget answer.

What's the minimum phone for AI tennis analysis?