Updated October 17, 2026 · SumCue Editorial Team
Monzo Flex vs Upgrade OneCard™
Upgrade OneCard™
Higher score in this comparison
Monzo Flex
Monzo Flex vs Upgrade OneCard™: the differences
| Compare | Monzo FlexReviewSee alternativesSee alternatives | Upgrade OneCard™ReviewVisitVisit |
|---|---|---|
| Annual fee | £0 | $0 |
| Currency conversion fee | 0%Lower | 3% |
| Rewards type | None | Cashback |
| Perks | 0% interest over 3 months on purchases of GBP 100 or more, repeatable, 0% interest if you pay in full, No overseas fees (Mastercard exchange rate only), Section 75 purchase protection, Credit limit up to GBP 10,000, Flex purchases from up to 2 weeks ago, Instant notifications and real time balance updates, Separate paid card: Aura (GBP 15 a month) adds 1% cashback on groceries, 0.5% on everything else uncapped, auto invested cashback, Apple TV, Google AI Plus, 2 airport lounge and 2 fast track passes a year | Visa Zero Liability protection, Travel and Emergency Assistance Services, Roadside Dispatch, Upgrade Shopping offers, Rewards do not expire, 24/7 fraud monitoring and real time alerts, Flexible payment options Pay Now, Pay in 4, Pay Over Time (coming soon) |
| APR | 29% | Not confirmed |
| Rewards rate | Not confirmed | 3% cash back on gas, groceries, streaming and monthly subscriptions, and utilities; 1% on everything else, uncapped |
| Credit needed | Fair | Not confirmed |
Same on both: Card kind (Credit).
We earn a commission when you sign up through links on this site. Partner status can affect where a brand appears in our rankings. Partners with a live offer in your country come first, then every other brand by score.
Key differences
- Upgrade OneCard™ scores higher overall: 9.0 vs 8.8.
- Currency conversion fee is lower at Monzo Flex: 0% vs 3%.
- Perks: only Monzo Flex offers 0% interest over 3 months on purchases of GBP 100 or more, repeatable, 0% interest if you pay in full, No overseas fees (Mastercard exchange rate only).
- Perks: only Upgrade OneCard™ offers Visa Zero Liability protection, Travel and Emergency Assistance Services, Roadside Dispatch.
- Support channels: only Monzo Flex offers Chat.
- Support channels: only Upgrade OneCard™ offers Email, Phone.
- Features: only Monzo Flex offers Virtual card, Travel.
- Features: only Upgrade OneCard™ offers Rewards.
Our verdict on each
Monzo Flex
Monzo Flex suits people who want a no annual fee credit card and clear spending notifications, and it costs nothing to hold at £0. Borrowing from it costs more, since the card APR is 29% and a personal loan carries an origination fee of 0 on a 12 to 84 term.
Upgrade OneCard™
Upgrade says applying does not affect a credit score, but approval triggers a hard inquiry that may affect it.
Score breakdown
| Area | Monzo Flex | Upgrade OneCard™ |
|---|---|---|
| Cost | 9.1HigherAnnual fee £0, currency conversion fee 0% and loan origination fee 0, against a card APR of 29%. | 8.8An annual fee of $0 on the credit card and a monthly fee of $0 on the checking account, against 3% for currency conversion. |
| Offer | 9.2 | 9.4Higher |
| Trust | 8.4 | Not confirmed |
Spending 1,000 abroad
Monzo Flex
0
0% of 1,000
Upgrade OneCard™
30
3% of 1,000
Monzo Flex comes out 30 lower in this example.
Worked out from the stated prices and rates; your own total depends on how you use it. Facts checked September 26, 2026.
How they place
| Ranking | Monzo Flex | Upgrade OneCard™ |
|---|---|---|
| Credit and debit cards | 702 of 1594 | 39 of 1594 |
| Credit cards | 201 of 421 | 14 of 421 |
| Debit cards | 439 of 826 | 28 of 826 |
Every fact side by side
| Fact | Monzo Flex | Upgrade OneCard™ |
|---|---|---|
| Pricing model | No annual fee | No annual fee |
| Features | Virtual card, Travel | Rewards |
| Audience | Kids, Business | Not confirmed |
| Legal entity | Monzo Bank Limited | Upgrade, Inc. |
| Headquarters | United Kingdom | United States |
| Founded | 2015 | Not confirmed |
| Support channels | Help centre, Chat | Email, Phone, Help centre |
Loans
| Fact | Monzo Flex | Upgrade OneCard™ |
|---|---|---|
| Loan amount | £10,000 to £35,000 | Not confirmed |
| Term | 12 to 84 months | Not confirmed |
| Arrangement fee | 0 | Not confirmed |
| Funding time | Minutes after approval, into the Monzo account | Not confirmed |
| Representative example | Borrow £4,800 over 36 months, 35 monthly repayments of £181 plus one final payment of £150.99, 20.9% fixed interest rate, 23.0% representative APR, total repay £6,485.99 | Not confirmed |
| Rate type | Fixed | Not confirmed |
| Lender type | Direct lender | Not confirmed |
| Free early repayment | Yes | Not confirmed |
| Eligibility | UK residents aged 18+, Monzo Current Account required | Not confirmed |
| Loan types | Personal, Debt consolidation, Car | Not confirmed |
| Use cases | Home improvement | Not confirmed |
Debit cards
| Fact | Monzo Flex | Upgrade OneCard™ |
|---|---|---|
| Monthly fee | £0 | $0 |
| Free ATM withdrawals | £200 | $0 |
| Card type | Debit | Debit |
| Cashback rate | Not confirmed | 2% |
| Card network | Mastercard | Visa |
| Currencies | 38 | Not confirmed |
Where each stands against the rest
| Fact | Monzo Flex | Upgrade OneCard™ | Median |
|---|---|---|---|
| APR | 29%highest quarter | Not confirmed | 11.635% |
| Currency conversion fee | 0%below the median | 3%highest quarter | 1% |
Median across 486 listed providers.
Pros and cons
Monzo Flex
Pros
- Annual fee of £0 and currency conversion fee of 0% both rank 1 of 186 brands on our data
- Free early repayment on the personal loan, with an origination fee of 0
- Loan money lands Minutes after approval, into the Monzo account, and the card sends instant notifications and real time balance updates
Cons
- The card APR of 29% sits well above the site median of 15.5% for cards
- Rewards are none on the standard card, with cashback only on the separate paid Aura card
- Support runs on help centre and chat only, with a help centre and chat rather than a phone line
Upgrade OneCard™
Pros
- Age, location and repayment-capacity requirements are specified
Cons
- Approval triggers a hard inquiry that may affect the applicant’s credit score
Who each suits
Monzo Flex
Who it suits
- Existing Monzo Current Account holders who pay the balance in full each month
- Travellers who want a card with a currency conversion fee of 0%
- Borrowers wanting a fixed rate personal loan with free early repayment
Who should look elsewhere
- Anyone who wants cashback or points on the standard card, where rewards are none
- Borrowers who need a soft credit check, as the loan asks for fair credit
- People who need phone support, since support runs on help centre and chat
Upgrade OneCard™
Who it suits
- US applicants checking OneCard’s age, residency, credit inquiry and repayment criteria.
Who should look elsewhere
- Customers who want high advantages concentrated in one spending area.
- People who want extra travel benefits or premium card features.
Current offers
Monzo Flex
Current offer
Bonus
Cashback on brands you love: 2-10% cashback
Monzo current account customers; pick the offers in the app, shop in person or online with the Monzo card
Source, checked September 26, 2026
Country by country
| Country | Monzo Flex | Upgrade OneCard™ |
|---|---|---|
| United Kingdom | Yes | No |
| United States | No | Yes |
Questions about each
Monzo Flex
Is there an annual fee on Monzo Flex?+
There is no annual fee, listed as £0. The model is no annual fee, and the same brand charges a monthly fee of £0 on the current account side. Optional extras, such as the paid Aura card, sit outside that and carry their own charge.
What APR does Monzo Flex charge?+
The card APR is 29%, which is well above the site median of 15.5% and ranks 111 of 138 on our data. The perks list interest free months on larger purchases, and interest free spending if you pay in full. Repaying the balance each month keeps interest at nothing.
Upgrade OneCard™
What sets this card apart from other everyday cards?+
Many everyday cards change how they treat spending by rotating categories or adding tiers that shift from month to month. This product keeps the approach level, so general purchases follow one consistent pattern. That steadiness is its main appeal, although people who want stronger advantages in particular areas may prefer other cards for their habits.
Can the card be used in place of a debit card?+
The product combines several functions, including a debit card element alongside credit and borrowing features. Holders who prefer a debit style of spending can use that function for day to day payments. Anyone who plans to rely on it that way should check how each function is set up before committing to the arrangement.
Other options to compare
Other matchups
Upgrade OneCard™
Monzo Flex