Too many terms to remember
Every card has different categories, rates and caps — nobody remembers them all
A Thai-built AI credit-card assistant
Which card should I use?Know instantly which one wins
Tell LINE what you're about to pay for, and instantly know which card wins — with the baht amount you save.
✓ Free to start, no card linking✓ We never store full card numbers✓ Works even if the AI is down
WhichCard3× miles
Travel Infinite
WhichCard4% cashback
Cashback Plus
WhichCard5% dining
Dining Signature
You: paying ฿1,200 for dinner — which card?
Best: use Dining Signature
5% cashback = ฿60 · ฿36 more than any other card
20banks
covering Thailand's major card issuers
410cards
credit cards in our database
107promos
promotions updated daily
0seconds
to an answer — no app to open
See it work before you sign up
Ask in LINE, get the answer instantly
A real chat with WhichCard — it replies with the best card, plus the reason and the exact baht.
W
WhichCard
● online
Paying ฿5,000 at Shopee — which card?
Use KTC X฿180 more back
5% cashback on online shopping (vs 1% on your other cards).
SCB M≈ ฿60
And ฿1,200 for dinner?
Use Dining Signature฿36 more back
5% on dining — more than the 2% on your other cards.
You've got several great cards
but swipe the wrong one almost every time
Cashback, points, miles, promo caps — too much to remember at the register. The difference you quietly lose is real money.
Wrong card = lost money
A few baht each time, but thousands over a year
Points expire unused
Earned over a year, forgotten, then gone for free
Too many promos to track
New promos every week — which ones even apply to you?
How it works
3 steps, ready in a minute
No new app, no card linking — right inside the LINE you already use
1
Add WhichCard on LINE
One tap and WhichCard is in your chat, ready to answer
2
Tell it which cards you have
Pick your cards in the mini-app — we never ask for full card numbers
3
Ask before you pay
“Paying ฿1,000 for fuel — which card?” and get an answer with the numbers
Features
Maximize cash back on every swipe — without memorizing a thing
Know which card wins, and by how many baht
No guessing, no comparing tables yourself — we compute it from each card's real rules with a verifiable engine and tell you, in baht, exactly how much more one card is worth (not an AI guess).
Recommendation
+฿342
saved per month on average*
Trustworthy, even if the AI is down
Answers come from the calculation engine, not a guess — accurate and ready every time you're about to pay
Never leave points on the table
Alerts before points expire and before promo caps fill up — the rewards you earned won't quietly vanish
Promos that actually fit your cards
Only fresh promos that work with the cards in your wallet, updated daily — no hunting required
Your whole wallet, inside LINE
Every card, point balance, promo cap and perk in one mini-app — nothing new to install
*Savings figures are illustrative and depend on your actual cards and spending.
Privacy
Private by design
Money matters demand trust, so we keep as little data as possible
We never store full card numbers
Cards in the system are just catalog references — we never keep your card number
Points are manual-only
We never connect to your bank account — you stay in control of your data
Every promo has a source
Every promotion cites its source and date, fully traceable
Frequently asked questions
Is WhichCard free?
Free to start — ask for recommendations every month and manage your full wallet. If you want unlimited questions, a personalized promo feed, and points-expiry reminders, you can upgrade to Pro later.
Do I have to link a credit card or bank account?
Not at all. You just pick which card models you have from our catalog — we never ask for full card numbers and never connect to your accounts.
How accurate are the recommendations?
Recommendations are computed from each card's real benefit rules with a verifiable engine. The AI only understands your question and explains the answer — even if the AI is down, the answer stays correct.
Which banks' cards are supported?
We cover Thailand's major issuers — 20 banks and 410+ card models, with promotions we track and keep up to date.
Pricing
Start free, upgrade when you're ready
Both plans always give the correct answer — Pro just unlocks depth and automatic tracking.
Free
฿0
Pro
฿82.5 / month
Yearly ฿990 — ~4 months free · or ฿119/mo monthly
Which-card questions
5/month
100/month
Cards in your wallet
✓
✓
Best-card recommendation
Best card
Full ranking
Cap (spend limit) tracking
—
✓
Points-expiry reminders
—
✓
Promos matched to your cards
—
✓
Stronger AI for complex questions
—
✓
Start free in LINE
No card linking · Cancel anytime · We never store full card numbers
Next time, ask WhichCard before you pay
Add it on LINE today and start saving from your very next payment. Free, no card linking.
Add on LINE