Comparison

ShapeShift vs GEM

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

Head to head
About

ShapeShift

Manage your digital assets with a self-custody wallet and decentralized exchange aggregator. Swap various cryptocurrencies across different blockchains quickly and securely, with options to stake and earn yield.

Highlights
  • Cross-chain crypto swaps
  • Self-custody wallet
  • DeFi staking and yield earning
  • Best-rate pricing aggregation
  • Limit orders and custom tokens
  • Multiple account management
Features
Read full description

Take full control of your crypto with ShapeShift — a mobile-first wallet and DEX aggregator that lets you swap Bitcoin, Ethereum, stablecoins, and altcoins across top chains in seconds. • Fast swaps for Solana, Bitcoin, Ethereum, USDC, and more • Best-rate pricing via THORChain, Matcha, Jupiter, 0x, CoW Swap • Cross-chain BTC ↔ anything with full self-custody • One-tap DeFi: stake, add liquidity, and earn yield • Set limit orders, import custom tokens, and manage multiple accounts • No signups, no custodians, no KYC — your keys, your crypto Download ShapeShift and start swapping, staking, and earning — all from one powerful app.

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

ShapeShift4 screens
GEM4 screens

Verdict

The call

The clearest difference is rating: GEM at 5.0 against ShapeShift's 4.2. GEM also leads on update cadence (weekly vs every 5 weeks) and iOS requirement (13.0 vs 15.1). ShapeShift's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price 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. GEM sells 3 in-app purchases, starting at $0.99 per 7 days. ShapeShift asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GEM holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: ShapeShift has 82 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

ShapeShift ships an update every 5 weeks, GEM weekly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard7 real differences · 3 level
ShapeShift versus GEM: the parameters behind the verdict, then further details
ParameterShapeShiftGEM
PriceFreeFree
Rating4.2 (82 ratings)5.0 (1 ratings) — better
Positive reviews29.5% of reviews—
Number of ratings82 — better1
Update frequencyEvery 5 weeksWeekly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size27 MB58 MB
Age rating4+12+
DeveloperShapeShift AGAiremes

Bugs and requests

ShapeShift

Reported bugs

14 issues
  • Crashes on Start-up
  • Crashes when loading address book
  • Can't Login
  • Verification Failed
  • Password changed
Show 9 more
  • Constantly crashes at sign in
  • Crashes when trying to load the address book
  • Can't Use App
  • Crashes on Start-up
  • Crashes when loading address book
  • Can't Login
  • Verification Failed
  • Password changed
  • Constantly crashes at sign in

Requested features

3 requests
  • Dark mode option
  • Advanced analytics dashboard
  • Private Key Option

GEM

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

ShapeShift

No in-app purchases

3 purchases

GEM

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

Questions

Is ShapeShift free?
ShapeShift is free to download, with no in-app purchases.
Is GEM free?
GEM is free to download, with in-app purchases available.
Which has better reviews, ShapeShift or GEM?
GEM is rated higher. ShapeShift averages 4.2 out of 5 from 82 ratings, while GEM averages 5.0 from 1 ratings.
Do ShapeShift or GEM have ads?
GEM shows ads; ShapeShift does not.
Which is updated more often, ShapeShift or GEM?
ShapeShift ships an update every 5 weeks, and GEM weekly. Most recently, ShapeShift was updated on November 1, 2026 and GEM on October 31, 2026.

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