SpendFox mascot
🇪🇺 Built & Operated in the EU

Your money.
Your device.
Your privacy.

Finally, a budgeting app that makes money from your subscription - not from you.

Download SpendFox on the App Store
100% On-device storage
0 Data sold or shared
38 Languages supported

A smarter budgeting app - built for privacy.

Every transaction, budget, and insight is stored only on your iPhone, never on our servers. The one thing we ever send out is a store name, to fetch its logo and category, and even that is processed in transit and never stored. Your amounts, dates, and identity never leave your device.

Auto Transaction Categorisation

Four-layer engine classifies every transaction automatically - your corrections take top priority and are remembered permanently. Merchant logos fetched and cached.

Smart Insights & Subscription Scanner

Statistical spending pattern detection that runs entirely on your device. The subscription scanner surfaces forgotten subscriptions and recurring bills from the last 90 days automatically.

"Can I Afford It?" Calculator

Layers your budget, burn rate, upcoming bills, savings goals, and payment plan commitments into one answer. Shows split payment tiers with interest - or when you can comfortably afford it.

European Bank Sync

Connect European bank accounts, with up to 180 days of history backfilled on the first sync. Background sync runs every three hours, and your credentials stay in your Keychain, never on our servers.

Privacy by architecture, not by policy.

Privacy isn't a feature we bolt on - it's the foundational design principle of our entire stack. Your financial data is stored exclusively on-device. Our backend exists solely to enrich transactions - and is architecturally incapable of retaining them.

Multi-Layer Enrichment Pipeline

When transactions arrive from your bank, our backend fetches and processes the full transaction payload in-memory - amounts, dates, and merchant details - then immediately forwards the enriched result to your device without writing any of it to storage. Only merchant name strings are ever shared with our LLM cleaning layer or logo provider. Everything else is discarded the moment it leaves the pipeline.

On-device data storage
Local-only database · All financial records stay on your iPhone
Active
AES-256-GCM encryption
Transaction notes encrypted at rest · OAuth tokens stored in Keychain only
Secure
End-to-end iCloud sync
PBKDF2-HMAC-SHA256 key derivation · Passphrase only you hold
Secure
Transaction categorisation
Four-layer on-device engine · Confidence scoring · Audit trail
On-device
App Attest verification
Secure Enclave device authentication · Every backend request validated
Active
Cloud financial data storage
Transaction amounts · Balances · Account details · Spending history
Blocked
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Intelligence that stays on your device.

Download SpendFox for iOS. Your financial data is stored on your phone, not on our servers.

Download SpendFox on the App Store
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