What Kyra is
A privacy-first trading journal for iOS. Trades stored on-device. Pattern detection runs locally as classical statistical inference — Bayesian inference, Fisher's exact test, and multiple-comparisons correction. Every claim ships with a sample size and a confidence range. Four tiers (Tracking, Hint, Signal, Proven) sharpen as the trade count grows so claims stay honest about evidence. $4.99/mo or $39.99/yr after a 7-day trial.
What TradeZella is
TradeZella is the category leader in the cloud-based trading-journal lane. Web app (with companion mobile apps), broker integrations across major US retail and prop-firm channels, deep analytics surfaces, replay tooling, and a paid-team operation behind it. The cloud architecture is what makes the integrations work — trades flow from the broker into TradeZella's servers, where they are processed, stored, and surfaced through the web UI. TradeZella's annual pricing typically sits well above Kyra's; pricing tiers and exact figures change periodically and are best confirmed on TradeZella's site directly.
How they compare
| Dimension | Kyra | TradeZella |
|---|---|---|
| Platform | iOS-native | Web app + companion mobile apps |
| Where trade data lives | On the user's device + optional iCloud user-private sync | TradeZella servers (cloud) |
| Account required | No (no email, no password) | Yes (email + password) |
| Broker integration | None | Yes — many major brokers via direct or OAuth integration |
| Pattern detection approach | Bayesian inference + Fisher's exact test + multiple-comparisons correction, on-device | Analytics dashboards and cloud-side aggregations |
| Sample size on every claim | Yes — n + confidence range rendered per pattern | Not documented in the standard interface |
| Multiple-comparisons correction | Yes | Not documented in the standard interface |
| Trade replay / chart playback | No | Yes |
| Web/desktop access | No (iOS-native by design) | Yes (web is the primary interface) |
| Pricing | $4.99/mo or $39.99/yr; one tier, one price | Higher annual; pricing tiers change periodically |
| Free tier | Unlimited logging + your single strongest pattern | Limited free or trial-only depending on plan |
The architectural difference is the load-bearing row. Everything else descends from it.
Who should pick which
Pick TradeZella if:
- You want broker auto-sync so trades flow into the journal without manual entry
- You use the web on a laptop as your primary trading workstation
- You want chart replay and visual playback as part of the journaling workflow
- You're trading through a prop-firm workflow where TradeZella has built-in integrations
- You're comfortable with a cloud journal that stores trade data on its servers and requires an account
Pick Kyra if:
- You want the trade data to live on your device, not on a server
- You want pattern claims with explicit sample sizes and uncertainty ranges, not dashboards that don't gate for sample size
- You want named statistical methods (Bayesian inference, Fisher's exact test) rather than proprietary analytics with unspecified math
- You journal primarily on a phone and want an under-10-second Quick P&L entry path
- You prefer no account, no email, no password — open the app and log
- You want a journal whose developer does not store your trade history
The honest trade-off
TradeZella is a more capable product for traders who want broker integration, web access, chart replay, and the deep analytics surface that cloud architecture enables. Those are real advantages and they are why TradeZella is the category leader.
Kyra is shaped by a different commitment. Trade data stays on the device because Kyra does not operate a server that stores it. The pattern engine shows statistical claims rather than dashboard aggregations because it does not assert what the sample size cannot support. Pricing is one tier at one price because the cost should be clear. Those choices produce a different product, not a worse one.
If broker auto-sync is the binding constraint of your workflow, TradeZella is the right tool. If on-device storage plus sample-size-gated pattern claims are the binding constraints, Kyra is the right tool. Both products exist because both constraint sets are real.
For the architectural reasoning, see Why on-device. For the math, see The math behind Kyra. For the security model that the on-device architecture buys, see Security.
Download Kyra on the App Store · Why on-device · The math behind Kyra · The full security model · Compare to other journals
