Openbank vs. Zynlo Bank
High-Yield Savings Account Comparison
By Aviel Fahl|Last Updated: November 12, 2025
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Summary of Openbank vs. Zynlo Bank
Key Metrics at a Glance
| Feature | Openbank | Zynlo Bank |
|---|---|---|
| Top Savings APY | 4.20% High-Yield Savings Account | 4.20% Tomorrow Savings Account |
| Minimum to Open | $500 | $10 |
| Minimum Balance for Top APY | $0 | $0.01 |
Openbank
Strengths
- Openbank offers a competitive APY of 4.20% for its High-Yield Savings Account.
- No maintenance fees are charged for the High-Yield Savings Account at Openbank.
- No minimum balance is required for the High-Yield Savings Account at Openbank.
Potential Drawbacks
- Openbank has a low App Store rating of 3.2.
- Openbank is not rated by the BBB and is not BBB Accredited.
- Openbank has no physical branches.
Zynlo Bank
Strengths
- Zynlo Bank has a higher BBB rating of A+.
- Zynlo Bank offers a low minimum deposit of $10 for its Tomorrow Savings Account.
- Zynlo Bank's App Store rating is 4.0, higher than Openbank's.
Potential Drawbacks
- Zynlo Bank has no physical branches.
- Zynlo Bank's current APY is also 4.20%, not higher than Openbank's.
- Zynlo Bank has a Google Play rating of 3.5, lower than Openbank's.
→ As of 11/12/2025 both Openbank (High-Yield Savings Account) and Zynlo Bank (Tomorrow Savings Account) offer an APY of 4.20% .
→ Both banks yield $420 in interest on a $10,000 balance after one year. Neither has an APY advantage, so consider other features (fees, access, app ratings, etc.) when choosing.
Calculate Savings Growth for Openbank vs Zynlo Bank
Openbank - High-Yield Savings Account
Total savings breakdown:
- Interest earned: $2,564.3 (12.47%)
- Total contributions: $13,000 (63.22%)
- Initial deposit: $5,000 (24.31%)
Your total balance
$20,564.30
Total balance: $20,564.3
Earnings: $2,564.3
Bank OverviewZynlo Bank - Tomorrow Savings Account
Total savings breakdown:
- Interest earned: $2,564.3 (12.47%)
- Total contributions: $13,000 (63.22%)
- Initial deposit: $5,000 (24.31%)
Your total balance
$20,564.30
Total balance: $20,564.3
Earnings: $2,564.3
Bank OverviewWith a $5,000 initial deposit and $13,000 in total contributions over 5 years, Openbank's total earnings would be the same as Zynlo Bank's total earnings.
The Banksparency Savings Calculator provides estimated savings growth based on user input and our latest data.
Compare Openbank's vs Zynlo Bank's Savings Accounts
| Openbank | Zynlo Bank | ||
|---|---|---|---|
| Product | High-Yield Savings Account | vs | Tomorrow Savings Account |
| APY | 4.20% (as of 11/12/2025) | 4.20% (as of 11/12/2025) | |
| Bundled Account | No | No | |
| FDIC-insured | Yes | Yes | |
| Online Only | Yes | Yes | |
| Compound Frequency | Monthly | Daily | |
| Minimum Deposit | $500 | $10 | |
| Minimum Balance for APY | $0 | $0.01 | |
| Maintenance Fee | $0 | $0 | |
| Direct Deposit Required | No | No | |
| App Store Rating | 3.2/5 | 4.0/5 | |
| Google Play Rating | 3.2/5 | 3.5/5 | |
| BBB Rating | Not Rated | A+ |
Comparative Historical APY Insights (Last 8 Months)
| Openbank | Zynlo Bank | ||
|---|---|---|---|
| Product | High-Yield Savings Account | vs | Tomorrow Savings Account |
| Latest APY | 4.20 % | 4.20 % | |
| Trend | Sideways | Sideways | |
| Slope (bps/mo) | -3.4 | -1.6 | |
| Rate Changes / Mo | 0.25 | 0.12 | |
| Days Since Last Change | 114 | 35 | |
| High (-8 m) | 4.40 % | 4.35 % | |
| Low (-8 m) | 4.20 % | 4.20 % | |
| Draw-down from High | -4.5 % | -3.4 % | |
| Volatility (CV) | 0.021 | 0.013 |
APY Insights Glossary
- Latest APY
- Most recent advertised annual-percentage yield.
- Trend
- Direction over the last 8 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 (-8 m)
- Highest APY in the last 242 days.
- Low (-8 m)
- Lowest APY in the last 242 days.
- Draw-down from High
- How far today sits below the 8-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.