Comparison

Spark Voicemail vs Authenticator °

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

Head to head
About

Spark Voicemail

This app transforms your voicemail into a visual experience, allowing you to read transcripts, listen, and manage messages easily. It offers features like lock screen access, playback speed control, and email forwarding for enhanced productivity.

Highlights
  • Visual voicemail transcription
  • Lock screen playback and reading
  • Playback speed control
  • Email forwarding
  • Searchable voicemails
  • Personalized greeting setup
  • Biometric security
Read full description

Spark Voicemail revolutionises your voicemail experience, making it effortless to retrieve and respond to voicemails. ---- Please note: To use Spark Voicemail, you must be a Spark mobile customer. ---- KEY FEATURES: READ YOUR VOICEMAIL VISUALLY You can read automatic transcripts of your voicemail. Want to listen to them? That's easy; just press play. LISTEN TO OR READ YOUR VOICEMAIL ON THE LOCK SCREEN That's right - you don't even need to enter the App to read or listen to your latest voicemail. NATIVE SUPPORT FOR DARK MODE We've crafted a beautiful dark mode experience that's easy on the eyes. ACCESS YOUR VOICEMAILS IN ANY ORDER Navigating your voicemails is now as easy as a scroll and tap. View voicemails in threads, organised by contact. PLAYBACK SPEED CONTROL Save time or listen carefully to your voicemails with 0.8x, 1x, 1.5x, or 2x speed controls. EMAIL FORWARDING Add up to two email addresses to receive your voicemails right in your inbox. Why two email addresses? So you can boost your responsiveness by also sending voicemails to your assistant or team to respond on your behalf! Don't worry; you can filter out calls from personal contacts. SEARCH YOUR VOICEMAILS BY NAME OR KEYWORD With our built-in automatic transcription service, Spark Voicemail makes your voicemails effortlessly searchable. EASY PERSONALISED GREETING SETUP Spark Voicemail lets you easily record a new greeting. Change it every season, or if you're away on holiday. EASY MANAGEMENT Managing your voicemails has never been easier. Call back contacts, share your voicemails or delete them to save space. UNLOCK WITH BIOMETRICS Protect voicemails on your phone with a passcode and biometrics - Face ID and Touch ID. COMPLETE NOTIFICATIONS Read or listen to voicemails right from your lock screen or notification centre. Privacy Policy: https://www.spark.co.nz/help/other/terms/policies/privacy-policy/ Terms of Use: https://www.spark.co.nz/help/other/terms/

About

Authenticator °

This app enhances your online security by generating time-sensitive passwords for two-factor and multi-factor authentication. It offers seamless data synchronization across devices, Apple Watch support, and robust encryption for your sensitive information.

Highlights
  • One-Time Passwords (OTP)
  • Seamless Data Synchronization
  • Apple Watch Support
  • End-to-End Encryption
  • Import/Export Encrypted Backups
  • Auto-Lock & Biometric Authentication
Features
Read full description

Cutting-edge security meets convenience: Authenticator° is the ultimate iOS app designed to make your digital life safer and hassle-free. Now supporting Apple Watch, we safeguard your accounts across Twitter, Reddit, LinkedIn, Instagram, TikTok, Amazon, Facebook, Dropbox, and more, providing an unparalleled layer of protection. Key Features: • One-Time Passwords (OTP) – Boost your account security with two-factor or multi-factor authentication, using unique, time-sensitive passwords generated on-demand. • Seamless Data Synchronization – Sync your authentication data across multiple devices effortlessly, ensuring you have access to your accounts whenever you need them. • Apple Watch Support – Your one-time passwords are now a glance away. Enjoy seamless integration with your Apple Watch for quick, convenient authentication. • End-to-End Encryption – Enjoy peace of mind knowing your sensitive information is protected with the highest level of encryption, keeping your data secure from prying eyes. • Import/Export Encrypted Backups – Create private, encrypted backups of your data and effortlessly import or export them to ensure your information is always safe and accessible. • Auto-Lock & Biometric Authentication – Tailor the auto-lock time to your needs and use Touch ID or Face ID for seamless access to your accounts without compromising security. • No Account Required – There's no need to create a separate account for Authenticator°. Simply sign in with your Apple ID for data syncing and iCloud backups or opt for "device only" mode to keep your data exclusively on your device. With Authenticator°, you'll never have to worry about the security of your online accounts again. Take control of your digital life and keep your information safe from hackers and identity thieves with the ultimate authentication app. Download Authenticator° today and experience a new level of online security and convenience. Authenticator° subscription: Authenticator° Premium unlocks features like Data Sync Across Devices, End-to-End Data Encryption, Unlimited Tokens, and Encrypted File Export/Import. Available plan pricing is shown in the app before purchase. Payment will be charged to your App Store account at confirmation of purchase, and subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. You can manage or turn off auto-renewal in your account settings after purchase. See the instructions here: https://support.apple.com/en-us/HT202039 You can read the terms of use and privacy policy here: https://kapi90.github.io/authenticator_privacy_policy.html End User License Agreement (EULA) of the App Store applies: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Spark Voicemail4 screens
Authenticator °4 screens

Verdict

The call

The clearest difference is review sentiment: Authenticator ° at 77% against Spark Voicemail's 22%. Authenticator ° also leads on rating (4.8 vs 3.0) and update cadence (every 2 weeks vs every 2 months). Spark Voicemail's advantage is in-app purchases (none vs 14) and iOS requirement (12.0 vs 15.0). On price and ads 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. Authenticator ° sells 14 in-app purchases, starting at $9.99 per month. Spark Voicemail asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Authenticator ° holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Authenticator ° has 594 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 22% of Spark Voicemail's written reviews are positive against 77% of Authenticator °'s.

UpkeepUpdate frequency

Spark Voicemail ships an update every 2 months, Authenticator ° every 2 weeks. Both last shipped on October 19, 2026.

Scorecard8 real differences · 2 level
Spark Voicemail versus Authenticator °: the parameters behind the verdict, then further details
ParameterSpark VoicemailAuthenticator °
PriceFreeFree
Rating3.0 (4 ratings)4.8 (594 ratings) — better
Positive reviews22.2% of reviews76.7% of reviews — better
Number of ratings4594 — better
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS12.0 — better15.0
Further details — not scored
Size52 MB55 MB
Age rating4+4+
DeveloperNorwood Systems (Aust) Pty LtdBence Kaposzta

Customer experience

Spark Voicemail

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews81 reviews
Positive22.2%
Neutral9.9%
Negative67.9%

Authenticator °

All ratings594 ratings
Positive94.4%
Neutral3.0%
Negative2.5%
Written reviews103 reviews
Positive76.7%
Neutral7.8%
Negative15.5%

User reviews

Spark Voicemail

From 4 App Store ratings

What we love

  • 💡 Visual voicemail management
  • 📝 Transcription of voicemails
  • 👍 Easy to read voicemails
  • 🔄 Works well for some users
  • ✨ Concept is brilliant

Room to improve

  • 🐛 Voicemails delayed
  • 🐛 App crashes frequently
  • 🐛 Activation failures
  • 🐛 Messages not arriving
  • 🐛 App stops working

Authenticator °

From 594 App Store ratings

What we love

  • 👍 Easy to install and use
  • 🔒 Secure password management
  • 🚀 Efficient and fast
  • 👍 Great user interface
  • 🔒 Robust security features

Room to improve

  • 🐛 Occasional crashes or bugs
  • 🔒 Concerns about cloud storage security
  • 🤔 Forced 5-star review before use
  • 🤔 Unclear or confusing onboarding process

Bugs and requests

Spark Voicemail

Reported bugs

44 issues
  • Voicemails arrive a day later
  • Voicemail messages do not arrive in the app
  • App not working correctly with iOS updates
  • App fails to activate
  • App crashes on launch
Show 39 more
  • App stops receiving voicemails
  • App requires frequent reinstallation
  • Activation failed with error code 500
  • App locks users out after updates
  • App crashes when playing voicemails
  • App shows 'refreshing' and doesn't upload messages
  • App shows 'refreshing' for extended periods
  • App not accepting mobile number for activation
  • App closes immediately after launching
  • No notifications for new voicemails
  • App populates with old, deleted voicemails
  • New voicemails not appearing even after combing through old ones
  • Messages come back and repopulate after deletion
  • Messages not ordered chronologically
  • Cannot delete messages
  • Voice to text translation is inaccurate/rubbish
  • App stopped downloading voicemails after last release
  • App is slow with notifications, messages arrive 24 hours later
  • App shows 'this person has temporarily disabled this number' message
  • App shows error code 401 during activation
  • App shows error code 500 during activation
  • App crashes at caller ID proceed screen
  • App crashes immediately after launching
  • App closes automatically when opening to check a message
  • App revives deleted messages
  • App sorts messages into random order
  • App does not show contact names in email notifications
  • App does not have app badge or other notifications
  • App does not have time and date stamp on voicemails
  • App does not allow deletion of messages
  • App messages are not ordered understandably
  • App transcription is embarrassing garbage
  • Push notifications are intermittent
  • Messages from days ago appear after pull to refresh
  • Messages do not display in chronological order
  • No option to automatically forward all messages to email
  • Cannot select both audio and transcription when forwarding to email
  • App doesn't understand English names
  • App shows 'this person has temporarily disabled this number' when activated

Requested features

13 requests
  • Multi-line support for dual-SIM phones
  • Ability to block spam callers
  • Integration with native iOS voicemail
  • Improved transcription accuracy
  • Option to disable transcription
Show 8 more
  • Background refreshing
  • Human support option
  • Option to set temporary greeting on a schedule
  • Contact names in email notifications
  • Option to forward both audio and transcription to email
  • Automatic forwarding of all messages to email
  • Ability to delete all messages
  • Time and date stamp on voicemails

Authenticator °

Reported bugs

3 issues
  • List of saved sites/accounts disappearing
  • Trouble logging in or resetting password
  • Incompatibility with older devices

Requested features

4 requests
  • Allow renaming of accounts
  • Add pop-up notifications like other authenticators
  • Improve sync with desktop/laptop
  • Provide more theme/customization options

In-app purchases

None

Spark Voicemail

No in-app purchases

14 purchases

Authenticator °

Subscriptions11
  • Monthly7 Days trial$9.991 Month
  • Monthly$9.991 Month
  • Monthly3 Days trial$9.991 Month
Show 8 more
  • 3 Month$12.993 Months
  • 1 Year, 50% off$19.991 Year
  • 1 Year Discounted$22.991 Year
  • 1 Year, 30% off$27.991 Year
  • 1 Year with initial offer1 Month trial$34.991 Year
  • Annual subscription7 Days trial$39.991 Year
  • 1 Year$39.991 Year
  • 1 Year3 Days trial$39.991 Year
One-time3
  • Free Lifetime subscriptionFree
  • Lifetime, intro offer$0.29
  • Lifetime$59.99

Questions

Is Spark Voicemail free?
Spark Voicemail is free to download, with no in-app purchases.
Is Authenticator ° free?
Authenticator ° is free to download, with in-app purchases available.
Which has better reviews, Spark Voicemail or Authenticator °?
Authenticator ° is rated higher. Spark Voicemail averages 3.0 out of 5 from 4 ratings, while Authenticator ° averages 4.8 from 594 ratings.
Do Spark Voicemail or Authenticator ° have ads?
Neither Spark Voicemail nor Authenticator ° shows ads.
Which is updated more often, Spark Voicemail or Authenticator °?
Spark Voicemail ships an update every 2 months, and Authenticator ° every 2 weeks. Most recently, Spark Voicemail was updated on October 19, 2026 and Authenticator ° on October 19, 2026.

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