ZBee vs Pralana
Last reviewed: September 2026
Pralana is the power user's retirement engine — famous for the deepest tax modeling in the DIY category and for optimizers that hunt for the best Roth-conversion and claiming strategies. It earns its devotees, and it asks something of them: hand-entered data and a dense, hands-on interface. ZBee comes at retirement from the opposite end — a native Mac app that syncs your real brokerage holdings and measures one thing, the most you can safely spend, with every assumption disclosed. This comparison is really about how much configuring you want to do, and whether you want a recommendation or a measurement.
The one-line version: Pralana searches for your optimal strategy; ZBee measures what your actual accounts support.
| ZBee | Pralana | |
|---|---|---|
| Where your data lives | On your Mac — by design, not policy | Their cloud (or local Excel) |
| Platform | Native Mac app | Web (+ Excel) |
| Native iPhone app | Free iPhone & iPad app — a private, on-device estimate | No |
| Uses your real accounts | Yes — read-only, direct to your Mac | No — you type them in |
| What linking brings in | Your actual holdings — every position, priced as of your last sync | No linking |
| Core question | Most you can safely spend | Tax-accurate projections |
| A yearly spending figure with guardrail thresholds |
Yes — this year's trigger points in dollars: the level below which the rules trim (and to what), and where a raise is earned. Published Guyton-Klinger rules you can verify by hand | Modeled inside projections — no live yearly readout |
| Would it have survived real market history? |
Yes — automatically: your safe-spend number is replayed through every real market sequence since 1928 (1929, 1966, 1973 and all) and reported as "survived N of M," with any failing years named | Historical sequence modeling — advanced, hands-on |
| Year-by-year tax detail (you can audit) |
Yes — federal, state, IRMAA, NIIT, RMDs, shown | Deepest — full 1040-level |
| Roth-conversion optimizer | No, by design: enter the Roth plan you or your adviser chose and see exactly what it does | Yes |
| Shows its methodology & what it won't model |
Yes — cited sources, published | Yes (dense) |
| Price | $132 a year | Online: $119 the first year, then $89 a year. Or $99 once for the Excel edition (Gold) |
Pralana's prices checked on its purchase page in September 2026; other features as published August 2026. They change — check Pralana for the current details. ZBee isn't affiliated with Pralana.
Where Pralana does more
Being straight about this: Pralana's tax engine is the deepest in the category — full 1040-level, year by year — and its genuine Roth-conversion and Social Security optimizers search for an answer rather than just modeling one. Its historical sequence modeling is also advanced, in a hands-on way. If you enjoy detailed configuration and what you want most is an optimizer that tells you what to do, Pralana may fit you better — and that's a fine reason to pick it. (To Pralana's credit, its methodology is published too, in its dense, engineering-manual way.)
Where ZBee is different
Start with what the model is grounded in: Pralana has no account linking — its precision applies to figures you enter and maintain by hand. ZBee syncs every real position read-only from your brokerage, priced as of your last sync, so the tax detail it does model (federal, state, IRMAA, NIIT, RMDs — shown, auditable) is computed against what you actually own today. Then what you get out: Pralana produces projections you interrogate; ZBee produces a spending number with this year's trim-and-raise trigger points in dollars, stress-tested automatically through every real market sequence since 1928. And ZBee is a native Mac app whose answer is worked out and stored on your machine, never on ZBee's servers: no cloud account, no spreadsheet upkeep.
The optimizer row is a genuine philosophical split, not a missing feature. ZBee measures what your current situation supports: enter the Roth conversion plan you or your adviser chose and see exactly what it does. It deliberately won't search for a restructuring, because an "optimal" conversion plan depends on estate goals, future tax law, and risk tolerance — things software can't know and a CPA or CFP is licensed to advise on. The full comparison covers this line-drawing in detail.
Which should you choose?
Choose Pralana if you want maximum tax-modeling depth and strategy optimizers,
and you're happy doing detailed, hands-on data entry and configuration.
Choose ZBee if you want the spending answer measured from your real accounts
with near-zero upkeep, on your own Mac, from a tool that shows its work.
ZBee is free for 30 days on your own portfolio — no account, no card — a fair place
to see the difference for yourself.
See pricing · The full comparison · ZBee vs Boldin · ZBee vs ProjectionLab · ZBee vs MaxiFi · Guyton-Klinger spending guardrails · How much can you safely spend? · Read the methodology