Comparison

Sideos Transponder vs Authnull Authenticator

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

Head to head
About

Sideos Transponder

Features
Read full description

This app can be thought of as your real-life wallet: it stores many pieces of information - an ID, a discount code, a loyalty or credit card, a ticket or a document, etc. - and you present them whenever they need to be verified by a service, an organisation or such, then you put them back into your pocket. Inside the Transponder, your data is safely stored within signed Verifiable Credentials (for the sake of the metaphor, think of them as cards), which are validated through your digital identity and can be used across the web only with your direct permission. Locally stored within your mobile Your unique digital identity is created and stored inside your mobile when you download the app, so that you can exchange data through it: this means enhanced security, since no information is valid without being paired with your device, therefore providing implicit two-factor authentication. Accept or provide credentials With the Transponder app, you can accept verifiable credentials and store them safely, in order to use them as needed across websites, services, web-apps. You can provide one credential to login without email or passwords on multiple websites, one to authorise payments without inputting your card details, one to perform a KYC or Bank Account verification procedure, and so on. t is the place where you can store, manage and share your data, identity and much more with other organizations.

About

Authnull Authenticator

Features
Read full description

AuthNull Authenticator is the companion app for the AuthNull identity and privileged access platform. When you sign in to a system your organization protects with AuthNull, your iPhone gets a request. Approve it with one tap, or deny it if it wasn't you. Works with: • Windows and Active Directory sign-ins • VPN (RADIUS) logins • Database access • Privileged password reveal • The AuthNull console and connected apps Approve with confidence • See what is being approved before you answer: the system, the user, the location and a risk level • Number matching: tap the number shown on your sign-in screen, so a request you didn't start can't be approved by mistake • Requests answered on another of your phones clear automatically Secured by your iPhone's hardware • Every approval is signed with a key created in the Secure Enclave. It never leaves the device. • Optional Face ID or Touch ID check on every approval • App lock with a 6-digit PIN, and unlock with Face ID or Touch ID One person, many places • Use the same account across several tenants of your organization • Add up to 10 phones to your account, and sign out any of them from Settings › Devices • Get an alert when a new phone is added to your account Easy to set up • Scan the QR code from your invite, open the invite link, enter an activation code, or sign in to your organization (including single sign-on) • Works with AuthNull cloud and on-premises servers, including private servers reached over VPN One-time codes • Add six-digit one-time codes (TOTP) for other services. The secrets stay on your iPhone. AuthNull Authenticator needs an account from an organization that uses AuthNull. Ask your administrator for an invite.

Screenshots

Sideos Transponder4 screens
Authnull Authenticator4 screens

Verdict

The call

The clearest difference is iOS requirement: Sideos Transponder at 13.0 against Authnull Authenticator's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

Scorecard1 real difference Ā· 5 level
Sideos Transponder versus Authnull Authenticator: the parameters behind the verdict, then further details
ParameterSideos TransponderAuthnull Authenticator
PriceFreeFree
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.0 — better15.0
Further details — not scored
Size74 MB22 MB
Age rating4+4+
Developersideos GmbHAsif Ali

In-app purchases

None

Sideos Transponder

No in-app purchases

None

Authnull Authenticator

No in-app purchases

Questions

Is Sideos Transponder free?
Sideos Transponder is free to download, with no in-app purchases.
Is Authnull Authenticator free?
Authnull Authenticator is free to download, with no in-app purchases.
Do Sideos Transponder or Authnull Authenticator have ads?
Neither Sideos Transponder nor Authnull Authenticator shows ads.
Which is updated more often, Sideos Transponder or Authnull Authenticator?
Sideos Transponder ships an update every 2 months, and Authnull Authenticator every 2 months. Most recently, Sideos Transponder was updated on October 27, 2026 and Authnull Authenticator on October 30, 2026.

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