credit cards: 14-day ROI scorecard for “cashback credit cards” — prove lift before annual

Scorecard sheet (fill in)

Metric	Nubank	Inter	C6 Bank
Day-0 baseline
effective annual fee
real cashback
card exit
Day-14 lift (%)
True period cost
Metric owner

Nubank, Inter, and C6 Bank on the scorecard

Nubank only “passes” “cashback credit cards” hype if the internal KPI rises with a day-14 screenshot.

Inter shows near “best cash back cards”; measure the same KPI, not marketing demos.

Keep C6 Bank as control: noisy lift freezes the shortlist.

Fails that kill annual

• Invented baseline for Nubank/Inter with no screenshot.
• Lift on C6 Bank without true period cost.
• “best credit cards 2026” never becomes a named KPI.
• Incomplete scorecard on day 14.

Scorecard go / no-go

Consider annual on card-picks-2026 only with a green sheet and ≥10% lift. Otherwise stay monthly.

Compare Card revisits when “cashback credit cards” or “best cash back cards” change the team KPI.

Kit: baseline, day-14 shots, true cost, metric owner, sentence tying “double cash back cards” to ROI.

Compare Card (card-picks-2026) turns “cashback credit cards” into a 14-day ROI scorecard — not an impulse annual upgrade for credit cards.

Nearby signals (“best cash back cards”, “double cash back cards”, “best credit cards 2026”) only count after baseline + KPI runs on Nubank/Inter/C6 Bank.

Rule: if ROI misses the floor in 14 days, the team stays monthly.

ROI scorecard for credit cards

effective annual fee. Add fee + fx + optional insurance over 12 months on Nubank and log the day-0 number.

real cashback. Simulate 3 categories from your statement on Inter; compare with C6 Bank in the same window.

card exit. Note cancel window and any penalty. No day-14 evidence → scorecard fails.

Three tracks a team runs in Fort Wayne

A finance ops in Fort Wayne froze baseline ~100 units/week, tested Nubank, mirrored on Inter, and kept C6 Bank as control with 2 seats.

Ceiling ~$70/month. No ≥10% lift vs baseline → no annual.

On card-picks-2026, if “cashback credit cards” cannot produce measurable lift on Nubank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best cash back cards” cannot produce measurable lift on Inter in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “double cash back cards” cannot produce measurable lift on C6 Bank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best credit cards 2026” cannot produce measurable lift on Nubank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “no annual fee card” cannot produce measurable lift on Inter in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “cash back cards” cannot produce measurable lift on C6 Bank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “credit cards” cannot produce measurable lift on Nubank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “cashback credit cards” cannot produce measurable lift on Inter in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best cash back cards” cannot produce measurable lift on C6 Bank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “double cash back cards” cannot produce measurable lift on Nubank in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best credit cards 2026” cannot produce measurable lift on Inter in 14 days, Compare Card treats it as credit cards noise.

On card-picks-2026, if “no annual fee card” cannot produce measurable lift on C6 Bank in 14 days, Compare Card treats it as credit cards noise.

Compare Card · card-picks-2026: 14-day scorecard for “cashback credit cards” on Nubank/Inter/C6 Bank before annual credit cards.

card-picks-2026-roi-scorecard-14d-2026-08-11 proof 1: in Mobile, a ops head ran effective annual fee on Nubank (add fee + FX + optional insurance over 12 months) and filed credit cards in 42 min. Compare Card does not reuse card-picks-2026-roi-scorecard-14d-2026-08-11 on another card-picks-2026 date.