Comparison

ChartTreker vs GEM

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

Head to head
About

ChartTreker

This app provides professional-grade mobile charting and technical analysis tools for active traders. It offers real-time market data, advanced indicators, and customizable charts without ads or distractions.

Highlights
  • Intuitive multi-touch charting
  • Real-time market quotes
  • Advanced technical indicators
  • Customizable chart themes
  • Unlimited watchlists (subscription)
  • Distraction-free interface
Features
Read full description

ChartTreker™ – Pro Charting for iPhone & iPad Built exclusively for active traders and technical analysts, ChartTreker™ delivers professional-grade mobile charting with the precision, reliability, and intuitive experience you've been waiting for. No ads, no distractions—just powerful charts, real-time quotes, and advanced analysis tools optimized for your iPhone and iPad. Why Active Traders Choose ChartTreker™: • PROFESSIONAL MOBILE CHARTING Intuitive multi-touch gestures provide effortless chart zooming, panning, and annotation, allowing deep technical analysis wherever you trade. • REAL-TIME MARKET QUOTES AND DATA Stay ahead of the market with accurate, reliable real-time quotes for all your tracked symbols. • ADVANCED TECHNICAL INDICATORS & ANNOTATIONS Access popular technical studies like MACD, RSI, ADX, Stochastics, and Ichimoku Clouds, plus powerful annotation tools like trend lines, Fibonacci retracements, and custom text notes. • FULLY CUSTOMIZABLE CHARTS Organize your trading workflow with customizable chart themes, unlimited watchlists, and layouts tailored specifically to your strategy (Standard Subscription). • PRIVACY & DISTRACTION-FREE CHARTING Enjoy a clean, professional environment. ChartTreker™ has zero ads and respects your privacy, never selling or sharing your data. See What Real Traders Are Saying: (5 Stars) "I am a full-time trader (16 yrs) and have tried every iPad charting app out there—ChartTreker blows them ALL away! Professional-grade charts and indicators. Love it!" – Jeff York (@mpgtrader) (5 Stars) "Finally, an app that brings advanced, versatile trading tools to mobile. Helps me track all my stocks easily in one place." – David2million FREE FEATURES: • Interactive charts: Zoom, pan, annotate effortlessly • 18 advanced technical studies included • Annotation tools: trend lines, Fibonacci, text notes & more • One customizable watchlist (up to 10 symbols) • Dynamic sorting and easy sharing (Twitter, email) UPGRADE TO STANDARD SUBSCRIPTION (Try 2 Weeks Free): • Analyze up to 3 charts simultaneously (multi-timeframe) • Unlimited symbols and watchlists • Auto-refresh quotes & charts (5-sec to 5-min intervals) • Additional premium indicators: Floor Trader, Camarilla, Woodies, Demark, Fibonacci Pivots, % Bollinger Bands, Custom Oscillators, Donchian Channels, Moving Average Envelopes, Ribbons & Trailing Volatility Bands, VWAP (intraday) SUBSCRIPTION OPTIONS: • Monthly: $3.99 • 6-Month (save 16%): $19.99 Please note: • Payment will be charged to iTunes Account at confirmation of purchase Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal • Subscriptions may be managed by the user and auto-renewal may be turned off by going to Account Settings after purchase • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://legacy.charttreker.com/privacy-policy/ Terms of Use: https://legacy.charttreker.com/terms-of-use/ CONNECT WITH US: Web: charttreker.com X/Twitter: @ChartTreker

About

GEM

This app provides a data-driven monthly signal for investment decisions based on a dual-momentum strategy. It helps users choose between US stocks, international stocks, and safe assets like Treasury bills, offering backtesting and performance tracking.

Highlights
  • Monthly investment signal
  • Dual-momentum strategy implementation
  • Backtesting and performance tracking
  • Customizable ETF selection
  • Smart notifications
  • Pro subscription for advanced features
Features
Read full description

GEM Calculator is a free investment signal app that implements the Global Equity Momentum (GEM) strategy — a proven dual-momentum approach developed by Gary Antonacci to help investors decide between US stocks, international stocks, and safe assets like Treasury bills. Stop guessing. Get a clear, data-driven monthly signal telling you exactly what to hold. HOW IT WORKS The GEM strategy uses two simple rules every month: 1. Safety Check - Is the US stock market trending up or down? If down, move to safe assets. 2. Pick the Winner - If markets are trending up, compare US vs international stocks and hold whichever has stronger 12-month momentum. That's it. One decision per month. No day trading, no complex analysis. MONTHLY INVESTMENT SIGNAL Open the app and instantly see this month's signal: - LONG SPY — Hold US equities - LONG VEU — Hold international equities - CASH BIL — Move to Treasury bills (risk-off) The signal includes a buffer indicator showing how far the market is from a trend reversal, plus a countdown to the next monthly update. BACKTEST & PERFORMANCE TRACKING Don't just trust the strategy - verify it: - Full historical backtest with Dollar-Cost Averaging (DCA) simulation - Compare GEM returns vs Buy & Hold across 1, 2, 3, and 5-year periods - Maximum drawdown analysis for both strategies - Month-by-month detailed log of every signal and portfolio change - Interactive performance charts for all three asset classes CUSTOMIZABLE ETF SELECTION Tailor the strategy to your broker and region: • Choose from 30+ ETFs for each asset slot • US Equities: SPY, VOO, IVV, QQQ, and more • International Equities: VEU, VXUS, EFA, EIMI.L, AMUN.PA • Safe Assets: BIL, SHV, SGOV • Non-US listed ETFs supported for European and global investors SMART NOTIFICATIONS Never miss a signal change. Enable monthly reminders on the 1st of each month so you always know when to check your portfolio allocation. GEM PRO Upgrade to Pro for the full experience: • Monthly signal alerts pushed to your device • Extended backtest history up to 5 years • Custom ETF watchlist • Priority updates and new features WHO IS THIS FOR? • Passive investors who want a systematic, rules-based approach • Index fund investors looking to reduce drawdowns • Momentum strategy enthusiasts • Anyone tired of emotional investing decisions GEM Calculator is an educational tool. Past performance does not guarantee future results. Always do your own research before making investment decisions. You may purchase an auto-renewing subscription through an In-App Purchase. • Auto-renewable subscription • Weekly ($3.99), 3 months ($27.99) and 1 year ($79.99) durations • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase • Privacy policy and terms of use: Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ GEM Calculator Terms of Use: https://flymate.io/terms_of_use.html GEM Calculator Privacy Policy: http://flymate.io/privacy_policy.html

Screenshots

ChartTreker4 screens
GEM4 screens

Verdict

The call

The clearest difference is rating: GEM at 5.0 against ChartTreker's 4.5. GEM also leads on update cadence (weekly vs every 6 weeks) and iOS requirement (13.0 vs 18.0). ChartTreker's advantage is ads (none vs shown) and ratings volume (27 vs 1). On price, in-app purchases, monetization model and device support 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. ChartTreker sells 2 in-app purchases, starting at $3.99 per month and GEM sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

GEM holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: ChartTreker has 27 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

ChartTreker ships an update every 6 weeks, GEM weekly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
ChartTreker versus GEM: the parameters behind the verdict, then further details
ParameterChartTrekerGEM
PriceFreeFree
Rating4.5 (27 ratings)5.0 (1 ratings) — better
Positive reviews71.7% of reviews—
Number of ratings27 — better1
Update frequencyEvery 6 weeksWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.013.0 — better
Further details — not scored
Size104 MB58 MB
Age rating4+12+
DeveloperLiquidstreams, LLCAiremes

Bugs and requests

ChartTreker

Reported bugs

17 issues
  • Prices not updating
  • App crashes
  • Watchlists disappear after crash
  • Real-time quotes not working
  • Fibonacci retracement calculation error
Show 12 more
  • Charts not loading
  • App timing out
  • Tutorial locks up app
  • Candles not appearing on daily chart
  • RSI chart disappeared
  • Chart zooming sluggish
  • App not reflecting stock splits
  • Daily charts limited to 2 years
  • App crashes and requires reinstallation
  • Cannot save across platforms
  • Hard to control drawing trendlines
  • QuickStart Tutorial locks up app

Requested features

10 requests
  • Logarithmic price scale option
  • Crosshairs/cursor for individual bars
  • Real-time quotes for non-US stocks
  • Equity and commodity futures and forex charts
  • Sync charts across devices
Show 5 more
  • Add ASX exchange
  • Scale stock symbols larger
  • Update between devices
  • Dark mode option
  • Advanced analytics dashboard

GEM

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

ChartTreker

Subscriptions2
  • Standard Subscription$3.991 Month
  • Standard Subscription$19.996 Months
3 purchases

GEM

Subscriptions3
  • Weekly Plan$0.997 Days
  • 3-Month Plan$10.993 Months
  • Yearly Plan$39.991 Year

Questions

Is ChartTreker free?
ChartTreker is free to download, with in-app purchases available.
Is GEM free?
GEM is free to download, with in-app purchases available.
Which has better reviews, ChartTreker or GEM?
GEM is rated higher. ChartTreker averages 4.5 out of 5 from 27 ratings, while GEM averages 5.0 from 1 ratings.
Do ChartTreker or GEM have ads?
GEM shows ads; ChartTreker does not.
Which is updated more often, ChartTreker or GEM?
ChartTreker ships an update every 6 weeks, and GEM weekly. Most recently, ChartTreker was updated on November 1, 2026 and GEM on October 31, 2026.

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