Free financial tools, no login required.
A growing suite of card, banking and crypto utilities — BIN lookups, currency conversion, IBAN and SWIFT validation, MCC decoding and more. All free, all private, no tracking.
Cards & BINs
BIN Lookup
Resolve any card BIN to issuer, country, scheme & type.
BIN Checker
Validate and inspect a card BIN instantly.
Card Country Checker
Find which country a card was issued in.
Card Brand Checker
Detect the network — Visa, Mastercard, Amex & more.
Prepaid Card Checker
Identify prepaid, debit and credit card types.
Card Level Checker
Resolve a card's product tier — Classic through Infinite — from its BIN.
Commercial Card Lookup
Spot business, corporate, purchasing and fleet BINs before they hit your interchange.
Test Card Generator
Sandbox card numbers for development and QA — not real cards.
Card Decline Codes
Look up any ISO 8583 decline code — meaning, retry advice & fix.
Money & FX
Business & Tax
VAT Calculator
Add or remove VAT at standard rates for 60 countries.
Sales Tax Calculator
State and average local sales tax for all 50 US states.
Profit Margin Calculator
Margin from cost and price, or the price to hit a target.
Markup Calculator
Cost to selling price, and the margin that markup really earns.
Commission Calculator
Flat or tiered sales commission with the blended effective rate.
Expense Splitter
Split group costs and settle up in the fewest transfers.
Invoice Generator
Build an invoice and save it as a PDF. No signup, no watermark.
Receipt Generator
Proof-of-payment receipts as PDF, free and without an account.
Advertising
Google Ads Budget Calculator
Plan ad spend, clicks, conversions, ROAS & ROI.
Meta Ads Budget Calculator
Plan Facebook & Instagram spend from CPM and reach through to profit.
TikTok Ads Budget Calculator
Cheap impressions, cold traffic — see if it clears break-even.
Break-Even ROAS Calculator
The ROAS you actually need: 1 ÷ margin. At 30% that is 3.33x, not 2x.
Campaign Profit Calculator
Profit in dollars after COGS and media — not a ROAS multiple.
CTR Calculator
Click-through rate and what a change to it does downstream.
CPM Calculator
Cost per thousand impressions, reach, and the real cost per customer.
CAC Calculator
Paid vs blended customer acquisition cost, and the gap between them.
LTV Calculator
Two lifetime-value models side by side, plus LTV:CAC and payback.
SEO
Meta Tag Generator
Title, description, Open Graph and Twitter Card tags from one form.
SERP Preview Tool
Pixel-accurate Google snippet preview — width, not character count.
Schema Generator
JSON-LD structured data, with the types that still earn a rich result.
Robots.txt Generator
Crawl rules, AI bot blocking, and warnings when a rule overreaches.
Sitemap Generator
URLs to valid sitemap.xml, with index splitting past 50,000.
Canonical Checker
Canonical, robots and X-Robots-Tag signals — and where they contradict.
Redirect Checker
Trace every hop with status and timing. Detects loops and long chains.
Heading Checker
H1-H6 outline with missing H1s, skipped levels and empty headings.
Keyword Density Checker
Word and phrase frequency from body copy, boilerplate stripped out.
Slug Generator
Clean URL slugs with real transliteration, not stripped accents.
Banking
Crypto
Crypto Card Hub
Explore and compare the best crypto cards in one place.
Virtual Card Checker
Check virtual card BINs and compatibility.
Gas Fee Estimator
Live gas prices and USD transaction costs across 50 EVM chains.
DCA Calculator
Backtest recurring crypto buys against real historical prices.
APY Calculator
Compound interest, APR to APY, and what a token drop does to your yield.
Mining Profit Calculator
Live difficulty, break-even power cost, and payback that accounts for rising difficulty.
Liquidation Calculator
Liquidation price from real maintenance-margin tiers, plus the funding drift most tools ignore.
Wallet Address Checker
Validate an ETH, BTC or SOL address offline — EIP-55 checksum and typo detection.
Wallet Balance Viewer
Resolve an ENS name and read native balances across 12 EVM chains at once.
Token Decimal Checker
Read a token's real decimals on-chain and convert raw to human amounts.
ABI Decoder
Decode Ethereum calldata into a readable call. ERC20 and NFT signatures built in.
Transaction Decoder
Parse a raw signed transaction and recover the sender from its signature.
Bitcoin Transaction Size Calculator
vBytes from inputs and outputs, priced at the live mempool fee rate.
Instant
Every tool runs in your browser or at the edge — results in milliseconds.
Private
No accounts, no tracking, and we never store card or personal data.
Free forever
Built for developers, media buyers and travelers. Always free to use.
Beyond the tools: get a real crypto card.
Oninee issues virtual Visa and Mastercard BINs funded with USDT — accepted worldwide for ads, SaaS, travel and everyday spending.
Explore Oninee
Discover our complete suite of crypto virtual card solutions and services