Comparison

SubZero vs FPA 39a

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

Head to head
About

SubZero

Features
Read full description

Take control of every subscription you pay for, from streaming services to gym memberships.\n\nSubZero helps you see recurring costs clearly, track free trials and prepare for upcoming payments.\n\nSMART TRACKING\nAdd subscriptions and recurring payments in seconds\nSee monthly and yearly spending at a glance\nGroup costs by category\nSet a monthly budget and receive an alert when you go over it\n\nTRIALS AND REMINDERS\nTrack free-trial end dates\nReceive reminders before a trial or payment date\nReview active and paused subscriptions in one place\n\nANALYTICS\nView spending trends and category breakdowns\nFind your most expensive subscriptions\nCompare costs in your preferred currency\n\nPRIVACY AND SECURITY\nProtect the app with Face ID or Touch ID\nDelete your account and associated cloud data from Settings\n\nSubZero is free to download. Premium features require an auto-renewable subscription. Choose monthly or yearly Premium in the app. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. You can manage or cancel them in your Apple Account subscription settings.\n\nTerms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/\nPrivacy Policy: https://emircifci.github.io/subzero/privacy.html

About

FPA 39a

Features
Read full description

UNOFFICIAL APP — Not affiliated with, nor approved by AADE (the Greek Independent Authority for Public Revenue). It does not represent any government or public authority. Fpa 39a is an independent, unofficial client for AADE's online service "Article 39a par. 5 of the VAT Code" — the VAT reverse charge mechanism. You sign in with your special TAXISnet web service credentials and manage your tasks as a Buyer, Supplier, or Representative. FEATURES • Buyers: registration/update, details, history • Representatives: management, history, one-time codes per representative • One-time codes (OTP): creation, search, reservation, deletion • Supplier: VAT check, representative verification, transaction registration/modification, history with filters SECURITY • Your login credentials are stored encrypted on your device • Optional lock with biometrics (fingerprint/face) or PIN • Communication exclusively over a secure connection (HTTPS) with AADE Note: This is an independent, unofficial application. The special TAXISnet web service credentials are required (these are NOT your regular TAXISnet login credentials). OFFICIAL AADE SOURCES • Article 39a par. 5 service: https://www.aade.gr/en/service-article-39a-par5-circular-11502992017 • Special web-service credentials management (myAADE): https://www1.aade.gr/sgsisapps/tokenservices/protected/displayConsole.htm DISCLAIMER: Unofficial application. Not affiliated with, nor approved by AADE. It is not a product or service of any government/public authority.

Screenshots

SubZero4 screens
FPA 39a4 screens

Verdict

The call

The clearest difference is in-app purchases: FPA 39a at none against SubZero's 2. FPA 39a also leads on update cadence (daily vs monthly) and device support (4 vs 2). On price, ads and iOS requirement 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. SubZero sells 2 in-app purchases, starting at $4.99 per month. FPA 39a asks for nothing beyond the download.

UpkeepUpdate frequency

SubZero ships an update monthly, FPA 39a daily. The most recent releases landed on October 18, 2026 and October 6, 2026 respectively.

Scorecard3 real differences Ā· 3 level
SubZero versus FPA 39a: the parameters behind the verdict, then further details
ParameterSubZeroFPA 39a
PriceFreeFree
Update frequencyMonthlyDaily — better
AdsYesYes
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPad, Mac, Apple Watch — better
Requires iOS17.0 — better18.0
Further details — not scored
Size13 MB28 MB
Age rating4+4+
Developeremirhan cifciTSETSONIS DIMITRIOS KAI SIA E.E.

In-app purchases

2 purchases

SubZero

Subscriptions2
  • SubZero Pro Monthly$4.991 Month
  • SubZero Pro Yearly$39.991 Year
None

FPA 39a

No in-app purchases

Questions

Is SubZero free?
SubZero is free to download, with in-app purchases available.
Is FPA 39a free?
FPA 39a is free to download, with no in-app purchases.
Do SubZero or FPA 39a have ads?
Both SubZero and FPA 39a show ads.
Which is updated more often, SubZero or FPA 39a?
SubZero ships an update monthly, and FPA 39a daily. Most recently, SubZero was updated on October 18, 2026 and FPA 39a on October 6, 2026.

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