# Signum download and install on iPhone (2026)

> AI Release · @ai_release1 · https://ai-release.org/guides/signum-skachat-i-ustanovit_en.html

## TL;DR

- **Time to complete:** ~15 minutes (App Store or TestFlight path); ~35 minutes if you sideload a build through Xcode.
- **Difficulty:** Basic for the App Store path, Intermediate for the Xcode path.
- **You will need:** an iPhone with a known iOS version (Settings → General → About), an Apple ID with two-factor authentication, a Wi-Fi connection, and — for the sideload path only — a Mac with Xcode.
- **Unknowns you must verify yourself:** our source posts do not state Signum's App Store listing, bundle identifier, minimum iOS version, download size, build number, or price. Treat every one of those as "check the vendor documentation" before you tap Install.

## Requirements and setup
![Illustration: Requirements and setup](https://ai-release.org/guides/img/signum-skachat-i-ustanovit-en-1.jpg?v=1793522755)


- **Device:** iPhone or iPad with enough free space. Check it in Settings → General → iPhone Storage; the listing on the App Store shows the download size in the same place it does for other apps (for reference, the Microsoft Windows App Mobile listing displays 208.3 MB — that is where the number lives).
- **Apple ID:** signed in at Settings → [your name] → Media & Purchases, with two-factor authentication enabled. Without 2FA, TestFlight invites and App Store purchases fail.
- **Network:** Wi-Fi for the first download; cellular works but large builds may be blocked by the carrier.
- **Signum minimum iOS version:** not published in our sources. The App Store listing states it as "Requires iOS X.Y or later" under the Compatibility section — read that line before downloading.
- **Signum developer name:** not published in our sources. The listing's Developer field is the only trustworthy identifier; compare it with the vendor's documentation.
- **Sideload path only:** macOS with Xcode installed, a free Apple ID for signing, and the Signum source archive or `.ipa`. Verify Xcode exists first — see Step 2.

Preparation checklist:

- [ ] iOS version recorded (Settings → General → About)
- [ ] Free storage greater than listed app size + 1 GB
- [ ] Apple ID signed in and 2FA active
- [ ] Signum's official distribution channel confirmed (App Store, TestFlight, or source)
- [ ] Developer name in the listing matches the vendor documentation

**Example:** on a fresh iPhone the About screen shows entries like "iOS Version 18.x", "Model Name iPhone", "Capacity 128 GB" — write down the iOS Version line, since it decides whether the build will even install.

## Step 1. Confirm the official channel and your device baseline

**What to do:** Open Settings → General → About and note the iOS version. Then open the App Store, search for Signum, and read three fields on the listing: Developer, size, and "Requires iOS". If the vendor documentation points to TestFlight instead, open the TestFlight invitation link from the vendor and skip the App Store search.

**Why:** Most "the app won't install" cases are a mismatch between the build's minimum iOS version, the App Store region tied to your Apple ID, and the publisher identity. Checking three fields takes a minute and removes the guesswork.

**How to check:** The listing shows a Developer name and a Compatibility line. For comparison, a legitimate Microsoft listing displays "Microsoft Corporation" as developer and "4+" as age rating — if Signum's listing shows an unrelated publisher, stop and re-read the vendor docs.

**Example:** App Store page → scroll to Information → "Seller: <vendor name>" and "Size: <NNN> MB". If the Seller field is empty or a personal name, you are on the wrong listing.

If you are also setting up a second device later, the Android side of the same workflow is covered step by step in [WordCraft APK for Android: download, verify and install safely](https://ai-release.org/guides/wordcraft-apk-android-skachat.html?utm_source=tg&utm_medium=channel&utm_campaign=guide_inline&utm_content=guide_to_guide).

## Step 2. Install Signum on the iPhone
![Illustration: Step 2. Install Signum on the iPhone](https://ai-release.org/guides/img/signum-skachat-i-ustanovit-en-2.jpg?v=1793522764)


**What to do:** Pick the channel that matches the vendor documentation.

*Channel A — App Store:* tap Get → Install → confirm with Face ID or your Apple ID password. The icon appears on the Home Screen and fills a progress ring.

*Channel B — TestFlight:* install TestFlight from the App Store, open the vendor's invitation link, tap Accept, then Install. TestFlight displays builds in the `version (build)` format — for reference, a public build of Cortiq Mobile was labelled `1.3.0 (47)`.

*Channel C — Xcode sideload:* with the Signum project or `.app` bundle on the Mac, run these checks first:

```bash
xcodebuild -version
security find-identity -v -p codesigning
plutil -p ./Signum.app/Info.plist | grep -E 'MinimumOSVersion|CFBundleIdentifier|CFBundleShortVersionString'
```

Expected output: an Xcode version line, at least one valid signing identity, and three plist keys printed with their values. Then open the project in Xcode, select your personal team under Signing & Capabilities, set a unique bundle identifier (for example `com.<yourname>.signum`), connect the iPhone by cable, select it as the run destination and press Run. Finally trust the certificate: Settings → General → VPN & Device Management → Developer App → Trust.

**Why:** iOS only launches an app whose signature matches a certificate the device trusts. The App Store and TestFlight paths hand you a pre-signed build; the Xcode path signs it locally, which is why the bundle identifier must be unique and the certificate must be trusted manually.

**How to check:** Confirm the phone is visible to the toolchain before you press Run:

```bash
xcrun devicectl list devices
```

Expected output: a table containing your iPhone's name, its identifier (UDID), and a connected state. If the list is empty, the cable, the "Trust This Computer" prompt, or Developer Mode (Settings → Privacy & Security → Developer Mode) is the problem.

The same "install from a repository, then verify what you got" pattern is described for desktop apps in [Sideraven: install from GitHub and migrate your bookmarks](https://ai-release.org/guides/sideraven-ustanovka-s-github.html?utm_source=tg&utm_medium=channel&utm_campaign=guide_inline&utm_content=guide_to_guide).

## Step 3. Verify the install and the first launch
![Illustration: Step 3. Verify the install and the first launch](https://ai-release.org/guides/img/signum-skachat-i-ustanovit-en-3.jpg?v=1793522771)


**What to do:** Tap the Signum icon once, let it reach its first screen, then close it and check three things: the version number, the storage footprint, and the running process.

**Why:** A successful download is not the same as a successful launch. An untrusted signature, a stale beta that expired, or a build compiled for a newer iOS shows up only at first launch.

**How to check:**

1. Settings → General → iPhone Storage → Signum — the entry shows an app size and a version number.
2. If installed through TestFlight, the TestFlight app lists the installed build (for example `1.3.0 (47)`) together with an expiry date.
3. Stream the device log from the Mac while the app launches:

```bash
log stream --predicate 'process == "Signum"' --level info
```

Expected output: a stream of lines containing the process name and no `crash` or `Code Signature Invalid` entries. Press Ctrl+C to stop.

Success looks like this: the icon launches without a dialog, the version in step 1 matches the vendor documentation, and the log stream shows the process starting. If you want a second, independent reference point for how a small on-device build behaves on a phone, see [AI Agent on Your Phone: How to Install and Use an On-Device Assistant](https://ai-release.org/guides/ii-agent-pryamo-na-smartfone-kak-ustanovit-i-polzovatsy.html?utm_source=tg&utm_medium=channel&utm_campaign=guide_inline&utm_content=guide_to_guide).

## Troubleshooting

**Problem. The App Store refuses to load the listing at all.**

- Error: `Cannot Connect to App Store`
- Cause: the device clock drifted, or the App Store session is stale after a network change.
- Solution: Settings → General → Date & Time → enable Set Automatically; then Settings → [your name] → Media & Purchases → Sign Out, sign back in, and retry the search.

**Problem. The listing exists but the Install button is missing or greyed out.**

- Error: `This app is not available in your region.`
- Cause: the App Store region attached to the Apple ID does not match the storefront that carries the app.
- Solution: Settings → [your name] → Media & Purchases → View Account → Country/Region. Changing region requires a matching payment method; on a fresh account add one, switch, then re-open the listing.

**Problem. The Xcode build stops before it reaches the phone.**

- Error: `Signing for "Signum" requires a development team. Select a development team in the Signing & Capabilities editor.`
- Cause: no team is selected, so Xcode cannot create a provisioning profile.
- Solution: in Xcode open the target → Signing & Capabilities → Team → pick your personal team. If the next error reads `Failed to register bundle identifier`, the identifier is already taken — change it to a unique value such as `com.<yourname>.signum`, then run `xcrun devicectl list devices` again and press Run.

## Summary and next steps

You confirmed the official channel, installed Signum on the iPhone, and verified it through the storage entry and the device log. Next, record the installed version and build number somewhere you can find them, so the next update is a comparison rather than a guess.

## FAQ

**Is Signum free?**
Our source posts do not state a price. The App Store listing shows the price or "Get" button, which is the only authoritative answer for your region.

**Do I need a Mac to install Signum on an iPhone?**
Only for the sideload path. The App Store and TestFlight paths need nothing but the phone.

**Why does the app disappear from the Home Screen after a few days?**
Development-signed builds depend on a signing certificate that has a validity period. Check Apple's current provisioning limits and the vendor documentation; re-signing and reinstalling resolves it.

**Can I run Signum on Android too?**
Not from an iPhone. Android uses a different package format and a different install flow, described in [Best AI apps for Android in 2026](https://ai-release.org/guides/luchshie-ii-prilozheniya-dlya-android-v-2026-godu.html?utm_source=tg&utm_medium=channel&utm_campaign=guide_inline&utm_content=guide_to_guide).