Device requirements
Tacita runs a real language model on your phone. That puts a real floor under the hardware. This page lays out where the floor is, how it is enforced, and what that means if your phone is on the wrong side of it.
The short version
Tacita is built for flagship phones. The on-device language model needs several gigabytes of RAM and a modern GPU to answer at a comfortable pace, so the app is restricted to hardware that can run it well. You do not have to check anything yourself: if Tacita appears in your Google Play store or your App Store, your phone is on the supported list. If it does not appear, it is not — that is the system working as designed.
What we require
Android
- Android 12 or newer (API level 31+).
- Vulkan 1.2 graphics support, with compute capability.
- ARM 64-bit CPU (
arm64-v8a). - 8 GB of RAM recommended for the Pro model. The Light model runs on devices with less RAM that still meet the other floors.
iOS
- iOS 17 or newer.
- Metal-capable iPhone (every iPhone Apple still ships iOS 17 to).
- iPhone 15 Pro or newer for the best experience. Earlier iPhones that meet the iOS floor work, but the Pro model fits comfortably only on devices with 8 GB of RAM.
Examples of supported devices
A non-exhaustive list, by manufacturer. The pattern is the same in every row: the floor model, and any newer model in the same line.
| Manufacturer | Floor | Notes |
|---|---|---|
| Google Pixel | Pixel 7 and newer | Tensor G2 and later. Includes Pixel 8 / 8 Pro / 8a, Pixel 9 / 9 Pro / 9 Pro XL / 9a. |
| Samsung Galaxy | Galaxy S22 Ultra and newer | Snapdragon 8 Gen 1 and later. Includes the S23, S24, and S25 series, and the Z Fold 4+ / Z Flip 4+ foldables. |
| OnePlus | OnePlus 10 Pro and newer | Includes OnePlus 11, 12, and 13. |
| Xiaomi | Xiaomi 12 Pro and newer | Includes the 13, 14, and 15 series and Mi Mix Fold 3. |
| Sony / ASUS | Xperia 1 IV+, ROG Phone 6+, Zenfone 9+ | Any flagship from these lines released in 2022 or later. |
| Apple | iPhone 15 Pro and newer | iPhone 13 and 14 also meet the OS floor; the Pro model is tighter on RAM there. iPhone 16 and the M-series iPad are comfortably supported. |
Newer flagship phones from these manufacturers — and from any other manufacturer that ships Vulkan 1.2 graphics on Android 12+ — qualify automatically. Tacita does not maintain a manual whitelist; the requirements are capability-based, so when a new flagship launches that clears the bar, it is supported on day one.
Why we gate
Tacita is a privacy-first product. The privacy contract — no servers, no telemetry, no chat content leaving the device — depends on the language model running locally. The model in turn needs RAM, a competent GPU, and a CPU with enough performance cores to answer at a pace that feels like a chat. On older or lower-end phones that do not meet the floor, the model runs at a few tokens per second, the device thermally throttles, and the experience is poor — which is bad for the user and bad for the app's reputation.
Rather than ship a degraded experience to phones that cannot host the product properly, Tacita restricts itself to hardware that can. That is the trade-off behind the device list above.
What if my phone isn't supported
If Tacita does not appear in your Google Play store or your App Store, your phone is below the hardware floor and the store has correctly hidden the listing. There is nothing broken on your end — that is the system working as designed.
If your device meets the OS floor (Android 12 with Vulkan 1.2, or iOS 17) but only narrowly — for example a 6 GB phone — you may still see Tacita on the store. In that case the Light model is available; the Pro model will refuse to install with a clear message explaining that it needs more RAM. The Light model is the same Gemma 4 family at the smaller E2B size and remains a real, capable assistant.
Tacita's requirements will continue to track the flagship tier as the hardware moves. As Apple deprecates older iPhones each fall and as Android phones with newer GPUs become the norm, the bar will rise gently with the market — never more aggressively than that.
Related: the models documentation for the two GGUFs Tacita ships and the runtime planner that picks settings per device tier, the privacy architecture page for the encryption stack underneath, and the FAQ for direct answers to common questions.