Comparison

Position Size Calculator vs PropSize

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Position Size Calculator

This app provides quick and accurate lot size calculations for various trading instruments directly on your mobile device. It supports Forex, Metals, Commodities, Indices, and Crypto, with a customizable instrument library and support for all major account currencies.

Highlights
  • Accurate lot size calculations
  • Supports Forex, Metals, Commodities, Indices, Crypto
  • Customizable contract size, tick size, tick value
  • Built-in instrument library
  • Works with all major account currencies
  • Fast and minimal interface
Features
Read full description

Stop fumbling with web calculators while trading. Grid puts accurate lot size calculations right on your phone. Size your positions correctly in seconds. # Features • Supports Forex, Metals, Commodities, Indices, and Crypto • Customize contract size, tick size, and tick value • Built-in instrument library with broker-specific inputs • Works with all major account currencies • Fast and minimal interface designed for clarity and efficiency # Pricing Grid is premium and ad-free. A subscription is required to use the app. We offer a 7-day free trial so you can test all features. • Annual Plan - $19.99 / year • Weekly Plan - $2.99 / week • Lifetime Plan - $99.99 once Prices shown are for US customers and may vary by region. Payment charged to Apple Account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Manage subscriptions in Account Settings. Terms of Use: https://www.stadelbauer.dev/terms-of-use Privacy Policy: https://www.stadelbauer.dev/privacy-policy

About

PropSize

Features
Read full description

Position sizing for prop traders. Enter your balance, risk and stop loss to estimate a lot size. PropSize brings position sizing, configurable prop-firm loss-limit context and shareable trade cards together in one iPhone app. • Calculate forex, gold and supported index position sizes. • Use a stop distance in pips or enter entry and stop prices. • Type your own risk percentage or use quick adjustments. • Choose your firm and account type, with optional broker overrides. • Try a guided calculation before exploring subscription options. • Speak trade inputs using Apple's speech recognition, or type them. • Copy your lot size or share a trade card. Loss-limit context compares a single estimated trade risk with your configured initial account size and limit. PropSize does not connect to a trading account, track today's losses or open positions, or calculate remaining drawdown. Estimates exclude spread, fees and slippage. Currency conversions use reference rates, which may be cached. Broker contract and volume rules can vary; optional overrides are available. Subscriptions Choose a monthly or annual subscription. Eligible customers may receive the trial displayed at checkout. Apple determines eligibility. The price, trial and renewal terms are shown before confirmation. Subscriptions renew unless cancelled. Purchases and restores require an internet connection; some calculations can use cached rates. PropSize is a calculation tool, not financial advice. It does not guarantee a firm's rules are current or that a trade will avoid a breach. Privacy: https://propsize.app/privacy Terms: https://propsize.app/terms

Screenshots

Position Size Calculator4 screens
PropSize4 screens

Verdict

The call

The clearest difference is iOS requirement: PropSize at 15.1 against Position Size Calculator's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Position Size Calculator sells 5 in-app purchases, starting at $2.99 per 7 days and PropSize sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Position Size Calculator ships an update every 3 months, PropSize every 2 months. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

Scorecard1 real difference · 9 level
Position Size Calculator versus PropSize: the parameters behind the verdict, then further details
ParameterPosition Size CalculatorPropSize
PriceFreeFree
Rating4.5 (2 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationSubscription—
DevicesiPhoneiPhone, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size6 MB38 MB
Age rating4+4+
DeveloperChristoph StadelbauerJUSTICE UGHELIE

In-app purchases

5 purchases

Position Size Calculator

Subscriptions4
  • Grid Premium$2.997 Days
  • Grid Premium3 Days trial$4.997 Days
  • Grid Premium7 Days trial$19.991 Year
Show 1 more
  • Grid Premium3 Days trial$29.991 Year
One-time1
  • Grid Premium Lifetime$89.99
2 purchases

PropSize

Subscriptions2
  • PropSize Monthly3 Days trial$8.991 Month
  • PropSize Annual7 Days trial$59.991 Year

Questions

Is Position Size Calculator free?
Position Size Calculator is free to download, with in-app purchases available.
Is PropSize free?
PropSize is free to download, with in-app purchases available.
Do Position Size Calculator or PropSize have ads?
Neither Position Size Calculator nor PropSize shows ads.
Which is updated more often, Position Size Calculator or PropSize?
Position Size Calculator ships an update every 3 months, and PropSize every 2 months. Most recently, Position Size Calculator was updated on October 30, 2026 and PropSize on November 9, 2026.

Other comparisons