SolverPad vs Calto
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
SolverPad
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SolverPad β Smart Notes with Live Calculations SolverPad makes everyday and technical calculations fast, clear, and natural. Itβs a smart notepad with a built-in calculator, designed for people who think with numbers. Write notes the way you normally do β SolverPad instantly calculates results right inside your text. No switching apps. No copying numbers. Just notes that calculate themselves. --> Write Notes. See Results Instantly. Type regular notes like: Rent = 1200 Utilities = 150 Groceries = 400 Total = Rent + Utilities + Groceries SolverPad instantly shows the total next to your notes β clean, readable, and always up to date. Change any value, and every related calculation updates automatically. Your notes stay accurate without redoing anything. --> Variables That Update Everywhere Define values once and reuse them across your notes: hourly_rate = 25 hours = 40 weekly_pay = hourly_rate * hours Update a single number, and SolverPad recalculates everything that depends on it β instantly. Perfect for: * Budgets & expenses * Project estimates * Study notes & formulas * Freelance & hourly work tracking --> Smart Math That Feels Natural SolverPad supports: * Percentages (e.g. 20% of 500, 1000 minus 15%) * Multi-line calculations with clear step-by-step results * Unit conversions (distance, weight, time, temperature) * Clean formatting that looks like notes, not spreadsheets Your calculations appear exactly where they matter β subtle, readable, and distraction-free. --> Why SolverPad Is Different Most note apps treat numbers as plain text. Calculator apps force you to jump back and forth. SolverPad combines both β so numbers and ideas live together. No broken workflows. No lost momentum. Just smooth thinking. --> Key Features * Live calculations as you type * Automatic updates when values change * Variable support for reusable values * Percentages and unit conversions * Multi-line calculations with clear results * Clean, minimal, distraction-free design * Works offline --> Perfect For * Students & teachers * Developers & engineers * Budgeting & expense tracking * Project planning & estimates * Quick math and daily calculations Whether youβre planning finances, solving problems, or exploring ideas β SolverPad makes numbers and notes work together beautifully. --> Premium Upgrade Upgrade to SolverPad Premium to enjoy a completely ad-free experience and support ongoing development.
Calto
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A smart calculator that works like math notes. --- Just type "price = 12000" and you're done. Calto is a free smart calculator that lets you write naturally like a math notepad while showing results in real-time. --- Why Calto? Regular calculators just show numbers. But real-life calculations are more complex. - Planning a trip budget and splitting expenses - Converting currencies while budgeting - Calculating tips, discounts, or freelance rates Calto handles all of this naturally, like taking notes. --- Key Features # Variables coffee = 4.50 lunch = 12.00 coffee + lunch = 16.50 Name your numbers. Make calculations meaningful. # Exponent Calculations 2^10 = 1,024 3^3 = 27 Power calculations in one line. # Natural Unit Conversion 10km in mile = 6.21 25C in F = 77 500g in oz = 17.64 100m2 in acre = 0.025 80+ units supported. Length, weight, volume, temperature, time, area, angle. # Live Exchange Rates 100 USD in EUR = 92.50 50 GBP in JPY = 9,375 6 major currencies. Auto-updated every 24 hours. # Mixed Currency Math 100 USD + 50 EUR = $154.25 Different currencies in one calculation. Just works. # Date Calculations today + 30days = 2026-03-04 today + 2weeks = 2026-02-16 Project deadlines, travel dates made easy. # Percent & Tip Calculator 20% of 5000 = 1,000 15% tip on 85 = 12.75 Discounts, tips, split bills. Type what you think. # Crypto Calculator 1 BTC in USD = 97,500 0.5 ETH in EUR = 1,650 Live cryptocurrency rates. Track your crypto portfolio. --- Perfect For - Trip budgeting and expense tracking - Freelancers calculating rates and invoices - Quick tip calculator and bill splitter - Real-time exchange rate conversions - Anyone tired of basic calculators --- Privacy First - Offline Calculator - All calculations stored on device only - Works offline - no internet required for basic math - Only anonymized usage statistics collected (for service improvement) - No account required --- Support Email: iamjw.dev@gmail.com Website: https://calto.iamjw.kr --- Download this free calculator now and experience math notes done right.
Screenshots
Verdict
The clearest difference is in-app purchases: Calto at none against SolverPad's 1. Calto also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. SolverPad sells 1 one-off in-app purchase. Calto asks for nothing beyond the download.
SolverPad ships an update weekly, Calto every 9 days. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.
| Parameter | SolverPad | Calto |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly β better | Every 9 days |
| Ads | Yes | No β better |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 β better | 15.6 |
| Further details β not scored | ||
| Size | 34 MB | 30 MB |
| Age rating | 9+ | 4+ |
| Developer | ASAPP STUDIO | JONGWOO PARK |
In-app purchases
SolverPad
- Premium Version$0.99
Calto
No in-app purchases









