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Ryban
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A native Mac app that measures your safe yearly spend from your real accounts — taxes, Social Security, RMDs, a thousand simulated markets. Free to explore; your data stays on your Mac.

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Website, pricing, platforms and company facts side by side.
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| Website | zbee.app | opalstack.com |
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| Company | 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


ZBee answers one question: how much can you safely spend per year in retirement? It connects to your brokerage and retirement accounts read-only (or takes manual entry / CSV import) and measures the maximum sustainable annual spend for the plan you actually have - with taxes, RMDs, Social...
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