American Express vs Discover Bank
High-Yield Savings Accounts Comparison
Last Updated: October 14, 2025
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Summary of American Express vs. Discover Bank
Key Metrics at a Glance
| Feature | American Express | Discover Bank |
|---|---|---|
| Top Savings APY | 3.50% High Yield Savings Account | 3.40% Online Savings Account |
| Minimum to Open | $0 | $0 |
| Minimum Balance for APY | $0 | $0 |
American Express
Strengths
- American Express offers a higher APY of 3.50% compared to Discover Bank's 3.40%.
- No maintenance fees for the High Yield Savings Account at American Express.
- American Express has a strong App Store rating of 4.9.
Potential Drawbacks
- American Express has an F BBB rating and is not BBB Accredited.
- American Express has a lower Google Play rating of 3.7 compared to Discover Bank.
Discover Bank
Strengths
- Discover Bank has an A+ BBB rating and is BBB Accredited.
- Discover Bank has a higher Google Play rating of 4.3.
Potential Drawbacks
- Discover Bank's current APY is lower at 3.40%, down from 3.50% 30 days ago.
- Discover Bank offers no branches for in-person banking.
→ As of October 14, 2025 American Express offers an APY of 3.50% for its High Yield Savings Account, with a minimum balance of $0, compared to Discover Bank's 3.40% APY for its Online Savings Account, with a minimum balance of $0.
→ American Express yields $10 more than Discover Bank on a $10,000 balance after one year. American Express pays $350, while Discover Bank pays $340 - an APY advantage for American Express.
Calculate Savings Growth for American Express vs Discover Bank
American Express
Total savings breakdown:
- Interest earned: $2,114.1 (10.51%)
- Total contributions: $13,000 (64.63%)
- Initial deposit: $5,000 (24.86%)
Your total balance
$20,114.10
Total balance: $20,114.1
Earnings: $2,114.1
Bank OverviewDiscover Bank
Total savings breakdown:
- Interest earned: $2,050.5 (10.23%)
- Total contributions: $13,000 (64.84%)
- Initial deposit: $5,000 (24.94%)
Your total balance
$20,050.50
Total balance: $20,050.5
Earnings: $2,050.5
Bank OverviewWith a $5,000 initial deposit and $13,000 in total contributions over 5 years, American Express's total earnings would be $63.6 higher than Discover Bank's total earnings.
The Banksparency Savings Calculator provides estimated savings growth based on user input and our latest data.
Compare American Express' vs Discover Bank's Savings Accounts
| American Express | Discover Bank | ||
|---|---|---|---|
| Product | High Yield Savings Account | vs | Online Savings Account |
| APY | 3.50% (as of 10/14/2025) | 3.40% (as of 10/14/2025) | |
| Bundled Account | No | No | |
| FDIC-insured | Yes | Yes | |
| Online Only | Yes | Yes | |
| Compound Frequency | Daily | Daily | |
| Minimum Deposit | $0 | $0 | |
| Minimum Balance for APY | $0 | $0 | |
| Maintenance Fee | $0 | $0 | |
| Direct Deposit Required | No | No | |
| App Store Rating | 4.9/5 | 4.9/5 | |
| Google Play Rating | 3.7/5 | 4.3/5 | |
| BBB Rating | F | A+ |
Comparative Historical APY Insights (Last 9 Months)
| American Express | Discover Bank | ||
|---|---|---|---|
| Product | High Yield Savings Account | vs | Online Savings Account |
| Latest APY | 3.50 % | 3.40 % | |
| Trend | Sideways | Sideways | |
| Slope (bps/mo) | -3.8 | -3.9 | |
| Rate Changes / Mo | 0.34 | 0.45 | |
| Days Since Last Change | 83 | 14 | |
| High (-9 m) | 3.80 % | 3.75 % | |
| Low (-9 m) | 3.50 % | 3.40 % | |
| Draw-down from High | -7.9 % | -9.3 % | |
| Volatility (CV) | 0.028 | 0.029 |
APY Insights Glossary
- Latest APY
- Most recent advertised annual-percentage yield.
- Trend
- Direction over the last 9 months (regression slope).
- Slope (bps/mo)
- Average monthly change; 10 bps = 0.10 pp.
- Rate Changes / Mo
- Typical number of APY moves per month.
- Days Since Last Change
- Recency of the latest APY adjustment.
- High (-9 m)
- Highest APY in the last 265 days.
- Low (-9 m)
- Lowest APY in the last 265 days.
- Draw-down from High
- How far today sits below the 9-month peak.
- Volatility (CV)
- Coefficient of variation = stdev ÷ mean.
Why Track Savings-Account APYs?
- See how quickly a bank reacts to Fed moves or competition.
- Gauge “twitchiness” - frequent moves can annoy savers.
- Spot if you're buying near a peak (draw-down) or riding a rise.
- Slope (bps/mo) shows speed of change.
- Volatility (CV) scales jumps by average level.