Comparison

TrustOTP vs Idum Authenticator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TrustOTP

Read full description

TrustOTP is a privacy-first, offline TOTP authenticator built to protect your accounts with secure two-factor authentication (2FA). Generate fast and reliable one-time passwords (OTP) without relying on cloud storage or external servers. PRIVACY BY DESIGN • No account required • No cloud sync or backups • Your secrets never leave this device • Anonymous analytics via TelemetryDeck (optional) FEATURES • Scan QR codes or enter secrets manually • Support for SHA1, SHA256, and SHA512 algorithms • Fast 6-digit OTP code generation • Clean and simple interface • Fully offline authentication • Lightweight and secure PERFECT FOR • Developers • IT professionals • Security-conscious users • Anyone who values privacy and control TrustOTP is designed with transparency, security, and simplicity in mind to help keep your digital accounts safer every day. IN-APP PURCHASE TrustOTP offers a one-time purchase to remove ads and unlock a cleaner experience. • Remove Ads (Lifetime Purchase) Payment will be charged to your Apple ID account at confirmation of purchase. This is a one-time payment and does not renew automatically. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Idum Authenticator

Features
Read full description

Idum Authenticator keeps your two-factor codes private and locked behind Face ID. Lost your phone or upgrading to a new iPhone? Turn on iCloud Sync in Settings and your codes come back automatically—end-to-end encrypted via iCloud Keychain. Generate TOTP and HOTP codes for the sites and apps you already use. Scan a QR code or paste an otpauth:// URI. By default, secrets stay on this device only. When you enable iCloud Sync in the app AND iCloud Keychain in iOS Settings, your Spaces and OTP secrets are stored in iCloud Keychain (E2E encrypted, not iCloud Drive or CloudKit). No Idum account required. The free plan stores up to 4 accounts; Idum Authenticator Pro unlocks unlimited accounts. WHY IDUM AUTHENTICATOR • Optional iCloud Keychain sync—OFF by default; you control it • Unlock with Face ID or Touch ID, then a 6-digit PIN • TOTP and HOTP (SHA-1 / SHA-256 / SHA-512, 6–8 digits) • Scan setup QR codes with the camera, or import from Photos / Files • Copy a code with one tap • No Idum account, no analytics, no ads GET STARTED • Create a PIN on first launch • Tap Add account and scan your service's QR code • Codes refresh automatically; HOTP counters increment when you copy • Enable iCloud Sync in Settings if you want restore on a new device PRIVACY • Default is local-only (Keychain on this iPhone) • Optional iCloud Keychain sync (E2E encrypted, user must enable) • PIN and Face ID unlock never sync—always this device only • Camera is used only to scan setup QR codes • Face ID is used only to unlock the app SUBSCRIPTIONS Idum Authenticator Pro (unlimited accounts) is available as: • Weekly auto-renewable subscription — €4.99 per week • Yearly auto-renewable subscription — €32.99 per year • Lifetime unlock — €78, one-time (non-consumable) Payment is charged to your Apple ID at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in iPhone Settings → Apple ID → Subscriptions. Prices are for the France / Euro storefront; other regions may differ. Support: https://macapps.idum.app/support/ Privacy Policy: https://macapps.idum.app/apps-privacy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

TrustOTP4 screens
Idum Authenticator3 screens

Verdict

The call

The clearest difference is ads: Idum Authenticator at none against TrustOTP's shown. Idum Authenticator also leads on update cadence (every 2 days vs every 3 weeks) and iOS requirement (18.0 vs 26.2). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. TrustOTP sells 2 in-app purchases, starting at $2.99 per month and Idum Authenticator sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

TrustOTP ships an update every 3 weeks, Idum Authenticator every 2 days. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

Scorecard3 real differences · 3 level
TrustOTP versus Idum Authenticator: the parameters behind the verdict, then further details
ParameterTrustOTPIdum Authenticator
PriceFreeFree
Update frequencyEvery 3 weeksEvery 2 days — better
AdsYesNo — better
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS26.218.0 — better
Further details — not scored
Size13 MB9 MB
Age rating17+4+
DeveloperJean Delio CandioIDUM

In-app purchases

2 purchases

TrustOTP

Subscriptions2
  • All Access$2.991 Month
  • All Access$19.991 Year
3 purchases

Idum Authenticator

Subscriptions2
  • Idum Authenticator Pro Weekly$3.997 Days
  • Idum Authenticator Pro Yearly$29.991 Year
One-time1
  • Idum Authenticator Lifetime$69.00

Questions

Is TrustOTP free?
TrustOTP is free to download, with in-app purchases available.
Is Idum Authenticator free?
Idum Authenticator is free to download, with in-app purchases available.
Do TrustOTP or Idum Authenticator have ads?
TrustOTP shows ads; Idum Authenticator does not.
Which is updated more often, TrustOTP or Idum Authenticator?
TrustOTP ships an update every 3 weeks, and Idum Authenticator every 2 days. Most recently, TrustOTP was updated on October 2, 2026 and Idum Authenticator on September 30, 2026.

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