Ballpark Math
Turns a rough guess ($18k to $26k) into a range, not a fake precise number.
Ballpark is an iPhone/iPad calculator for numbers nobody actually knows — type a range like $18k to $26k and it returns a range, a middle estimate and a chart instead of a falsely precise figure. It ranks which unknown in your model drives the most uncertainty, so it can tell you in one sentence what's worth researching next. Documents are plain UTF-8 text files, and units are checked so dollars-per-hour times hours can't quietly turn into nonsense. Every feature, including all twelve templates, is free; the one-time Pro purchase only lifts a three-document limit.
What holds up
- +Ranks which unknown drives most of your uncertainty, naming exactly what to research next.
- +Saves models as plain UTF-8 text files — open, diff or back them up outside the app.
- +Runs entirely on-device — no account, no network, nothing collected.
- +Free tier includes every feature and all twelve templates; Pro is a one-time unlock.
Mind the limits
- −Free tier caps you at three documents — Pro's one-time purchase removes that limit.
- −iPhone and iPad only — no Android, web or desktop version.
Picked here? Add the badge
Put it on your site. It links back to this page. Free for every listed product.
<a href="https://stillworks.dev/products/p/ballpark-math/"><img src="https://stillworks.dev/badge/ballpark-math.svg" alt="Picked by StillWorks" width="230" height="54"></a>