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Is Opus One Safe?

Opus One privacy label · by PISO 13, Inc. · checked November 2026

  • Collects location
  • Recently updated
App Privacy label Developer-reported · checked November 1, 2026
Used to track you
0types

None declared

Linked to you
6types
Not linked to you
1type
Short answer

Mostly a question of trust: Opus One collects data linked to you but declares no tracking. The sensitive items are location and user content. In total the label lists 7 data types; 41% of calendar planners we checked declare tracking.

At a glance

Opus One privacy in one look

Data exposure on the label
Linked to you
  1. 1
  2. 2
  3. 3
  4. 4

Built only from the developer's App Store label. It describes disclosure, not tested behaviour.

Verdict from the label
Linked to you, no tracking

Opus One collects 6 data types tied to your identity but declares no tracking.

Try it

Did Opus One ask for something?

Pick the permission prompt you saw. We compare it with what Opus One's developer declared.

It asked me for access to…
Tap a prompt to compare it with the label.
Matches the label

Opus One lists Location on its label. Choose While Using and turn off Precise Location if the feature works without it.

Matches the label

Opus One lists User Content on its label, linked to you. Choose Limited Access and pick only the photos you want to share.

Not on the label

Contacts is not on Opus One's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

Not declared on the label

Opus One declares no tracking, so a tracking prompt would contradict its label. Decline it, and consider reporting the mismatch to Apple.

Not on the label

Health & Fitness is not on Opus One's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

A permission is what the app can reach on your iPhone; the label is what the developer says leaves it. They answer different questions.

Line by line

What Opus One collects, explained

Data typeWhat it coversWhere to limit it
LocationSensitiveNot linked to you Where your phone is, either precisely (street level) or approximately (city or area). Settings › Privacy & Security › Location Services: choose Never or While Using, and turn off Precise Location if the app does not need it.
User ContentSensitiveLinked to you Messages, photos, videos, audio recordings, documents and support chats you create or upload. Settings › Privacy & Security › Photos: choose Limited Access or None; review Microphone and Files access too.
Contact InfoLinked to you Your name, email address, phone number or postal address. Use Sign in with Apple with Hide My Email where offered, and check the app's account and marketing preferences.
PurchasesLinked to you What you have bought or tend to buy. Review in-app marketing settings; subscriptions are listed in Settings › [your name] › Subscriptions.
IdentifiersLinked to you An account ID, screen name, customer number or a device-level ID such as the advertising identifier. Settings › Privacy & Security › Tracking: turn off Allow Apps to Request to Track, or tap Ask App Not to Track when prompted.
Usage DataLinked to you What you tap, open and view inside the app, plus which ads you have seen. There is no single iOS switch. Look for an analytics or personalised-ads toggle in the app's own settings.
DiagnosticsLinked to you Crash logs, launch times, hang rates and energy use. Settings › Privacy & Security › Analytics & Improvements › Share With App Developers controls what Apple passes on; the app's own crash reporting is separate.
Reading the label

What Opus One's label means for you

Opus One's label has 6 types under “Data Linked to You”, 1 type under “Data Not Linked to You”. A data type can appear in more than one section when it is used for different purposes — for example, identifiers used for both analytics and advertising.

Opus One declares no tracking, which means the developer says it does not combine your data with other companies' data for advertising or sell it to data brokers. The data linked to you — user content, contact info, purchases, identifiers, usage data and diagnostics — is still tied to your identity, typically through an account, and is covered by the developer's privacy policy and retention rules.

The items that deserve the most attention are location and user content. Location history reveals home, work and routines. Precise location deserves the most scrutiny.

Calendars reveal where you will be and who you meet. Planner apps may also read your other calendars and reminders. Check the Calendars permission level (full access or add-only) in Settings › Privacy & Security › Calendars.

Among the 152 calendar planners in our snapshot with a label, 41% declare tracking, 60% collect data linked to you and 26% say they collect nothing. Opus One lists 7 data types, more than the average of 2.9 for this group.

Productivity apps tend to collect the work you do in them — documents, notes and files — so User Content is common. The question is whether it syncs to the developer's servers and how it is protected there.

On your iPhone

Settings to check for Opus One

  1. 1

    Tracking

    Settings › Privacy & Security › Tracking. If “Allow Apps to Request to Track” is off, apps cannot ask, and they are told to treat you as having declined. You can also turn it off for this app alone.

  2. 2

    Location

    Settings › Privacy & Security › Location Services › Opus One. Choose While Using or Never, and switch off Precise Location if a city-level answer is enough.

  3. 3

    Photos

    Settings › Privacy & Security › Photos. Limited Access lets you pick exactly which pictures the app can see; Add Photos Only lets it save without reading your library.

  4. 4

    Sign-in

    When creating an account, Sign in with Apple can give the app a relay address from Hide My Email instead of your real one.

  5. 5

    Lock the app

    On iOS 18 and later, touch and hold the icon and choose Require Face ID. Anyone who picks up your unlocked phone then needs your face, fingerprint or passcode to open it.

  6. 6

    Notifications

    Settings › Notifications › Opus One › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Cross-app tracking

Does Opus One track you?

No tracking declared

There is no “Data Used to Track You” section on Opus One's label.

Does Opus One track you? Full answer and how to stop it →

iOS 18 and later

Lock Opus One behind Face ID

  1. Find Opus One on your Home Screen or in App Library.
  2. Touch and hold the icon until the quick-actions menu opens.
  3. Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
  4. Tap Require Face ID again to confirm. Opus One now asks for authentication every time it opens.

The lock is an iPhone feature, so it works whether or not Opus One has a passcode of its own. It does not change what the app sends to its developer.

From the App Store record

About Opus One

DeveloperPISO 13, Inc.
App Store categoryProductivity
Latest version2.9.6, released October 2026
First releasedSeptember 2016
RequiresiOS 15.0 or later
Size187 MB
Age rating4+
Languages4 (EN, FR, IT, ES)
Bundle IDcom.piso13.opus1Mobile

The current version shipped in October 2026, so the app is actively maintained and its label is likely current. Labels are updated by developers when practices change.

Read with care

What the label cannot tell you

  • A label is self-reported. Apple publishes the developer's answers and can reject apps that misrepresent them, but it does not independently verify what Opus One sends.
  • It does not say where data is stored, how long it is kept, whether it is encrypted, or which companies receive it. The privacy policy covers those points.
  • Optional data counts: if a feature lets you add something (a profile photo, a phone number), the type is listed even if you never use the feature.
  • Data handled only on your iPhone is not 'collected', so a no-collection label is compatible with an app that reads your files locally.
  • Third-party sign-in, payment processors and SDKs are supposed to be included, but a label can lag behind a new version.

The question to ask Opus One's developer: Does it need to read my calendars, or only add events?

How it compares

Opus One vs similar calendar planners

Data types listed on each App Store privacy label
Tracks youLinked to youNot linkedCollects nothing

Fewer types is not automatically safer: a cloud backup app has to collect your files to work. Compare like with like.

Checking another app?

Look up any of our apps in seconds, or put two labels side by side.

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Do it now

Your Opus One privacy checklist

Tick what you have done
Tick each step as you do it on your iPhone.

Done. You have applied every control the label points to.

Quick quiz

True or false?

  1. Q1Opus One's privacy label says it uses data to track you.
    Right.
    Not quite.

    False: there is no Data Used to Track You section on Opus One's label.

  2. Q2Apple tests every app to confirm its privacy label is accurate.
    Right.
    Not quite.

    Labels are self-reported by developers. Apple can reject or remove apps that misrepresent practices, but it does not audit each label.

  3. Q3Opus One collects Location.
    Right.
    Not quite.

    True: Location appears on its label, in the Not Linked to You section.

  4. Q4Data “Not Linked to You” is never sent off your iPhone.
    Right.
    Not quite.

    It is collected and sent; the developer says it is de-identified rather than tied to your account or device.

  5. Q5Tapping “Ask App Not to Track” can stop an app from working.
    Right.
    Not quite.

    Apple's rules require apps to work the same whether or not you allow tracking.

Questions people ask

Opus One privacy FAQ

Is Opus One safe to use?
Based on its App Store privacy label, opus One collects 6 data types tied to your identity but declares no tracking. Whether that is acceptable depends on what you will store in it. The label is developer-reported, not an independent security test.
Does Opus One track you?
No. Opus One's label has no Data Used to Track You section.
What data does Opus One collect?
Location, user content, contact info, purchases, identifiers, usage data and diagnostics. Of these, user content, contact info, purchases, identifiers, usage data and diagnostics are linked to your identity.
Who makes Opus One?
PISO 13, Inc., according to the App Store. It was first released in September 2016 and the current version is 2.9.6.
Can I lock Opus One with Face ID?
On iOS 18 or later, touch and hold Opus One's icon and choose Require Face ID (or Touch ID / Passcode). This is an iPhone feature and works for most downloaded apps, whether or not the app has its own lock. If you don't see the option, update iOS.
How does Opus One compare with other calendar planners?
Across 152 calendar planners with labels in our snapshot, 41% declare tracking and 26% say they collect no data. Opus One lists 7 data types against an average of 2.9.
Does it need to read my calendars, or only add events?
The privacy label cannot answer that. Look for it in Opus One's privacy policy or support pages, linked from the App Store listing. Check the Calendars permission level (full access or add-only) in Settings › Privacy & Security › Calendars.
How do I delete my data from Opus One?
Apps that let you create an account must also let you start account deletion from inside the app (an App Store rule since June 2022). Deleting the app from your iPhone alone does not delete data already sent to the developer.
Facts on this page come from Opus One on the App Store, as reported by the developer. Checked 2026-11-01. How we collect data · Report a correction