Comparison

ACE Checklist Editor vs ChronoCalc Pro

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

Head to head
About

ACE Checklist Editor

Create, manage, and execute aviation checklists digitally. Designed for pilots, it offers offline functionality, professional templates, and multi-format import/export for enhanced safety and efficiency in the cockpit.

Highlights
  • Digital aviation checklist creation
  • Offline functionality
  • Multi-format import/export (ACE, ForeFlight, Dynon)
  • Professional templates
  • Challenge & Response format
  • Revision history
  • Smart organization by aircraft or phase of flight
Features
Read full description

Transform Your Aviation Safety with Professional Digital Checklists ACE Checklist Editor is the professional pilot's choice for creating, managing, and executing aviation checklists on your iPhone, iPad, and Mac. Designed by pilots for pilots, ACE brings the reliability of paper checklists into the digital age with powerful features that enhance safety and efficiency. WHY PILOTS CHOOSE ACE • Universal Compatibility - Import and export checklists in ACE (.ace), ForeFlight (.fmd), and Dynon formats • Industry-Standard ACE Format - Compatible with Garmin avionics and other systems that support ACE files • Works Offline - All your checklists are stored locally on your device. No internet required in flight • Professional Templates - Start with expertly crafted templates for popular aircraft or create your own from scratch • External Drive Sync - Keep your checklists synchronized across devices using external drives • Smart Organization - Group checklists by aircraft, phase of flight, or custom categories SAFETY-FIRST DESIGN • Challenge & Response Format - Clear distinction between checklist items and expected responses • Emergency Procedures - Quick access to critical checklists with high-visibility formatting • Warning & Caution Items - Color-coded alerts for critical items that demand attention • Revision History - Track all changes with complete version control • No Distractions - Clean, focused interface designed for cockpit use POWERFUL FEATURES • Multi-Format Import & Export - Share checklists in Garmin (.ace) [.gcl and .gplts coming soon], ForeFlight (.fmd), or Dynon formats with other pilots and avionics systems • ForeFlight Integration - Import your existing ForeFlight checklists and export back in encrypted .fmd format • Dynon Compatibility - Full support for Dynon SkyView checklist format with proper line wrapping • Multiple Aircraft - Manage checklists for your entire fleet in one app • Customizable Sections - Organize by phase of flight: Preflight, Startup, Taxi, Takeoff, Cruise, Landing, Shutdown • Rich Formatting - Add notes, references, conditional items, and amplified procedures • Search & Filter - Quickly find any checklist or item across your entire library BUILT FOR REAL PILOTS Whether you're a student pilot building good habits, a CFI managing training aircraft, or a professional pilot flying complex aircraft, ACE adapts to your needs: • Student Pilots: Learn proper checklist discipline with clear, organized procedures • Flight Instructors: Create standardized checklists for your training fleet • Aircraft Owners: Maintain custom checklists that match your specific equipment and STCs • Professional Pilots: Manage multiple aircraft types with airline-style formatting ONE APP, EVERY DEVICE • Native iPhone, iPad, and Mac apps, all in one download • Edit on the Mac with a full desktop window, menus, and keyboard • Document-based app - Open .ace files directly from Files, email, or other apps • iCloud backup keeps your data safe YOUR DATA, YOUR CONTROL • All checklists stored locally on your device but auto synced via iCloud to other devices you control. • No account required • Core checklist editing is available without a subscription; optional subscriptions and lifetime purchases unlock additional features • Export your data anytime in ACE, ForeFlight, or Dynon formats • Privacy-focused: We never see your checklists IMPORTANT SAFETY NOTICE ACE Checklist Editor is designed to assist pilots but does not replace your aircraft's official Pilot Operating Handbook (POH) or FAA-approved flight manual. Always verify checklist items against your aircraft's official documentation. Every aircraft is unique with different equipment and STCs. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Additional Terms: https://www.acechecklist.com/terms Privacy Policy: https://www.acechecklist.com/privacy

About

ChronoCalc Pro

Features
Read full description

The simplest and most powerful way to calculate time. Perfect for pilots, freelancers, consultants, and anyone who needs to track and calculate hours with precision. FEATURES: - CSV Import/Export - Seamlessly import time logs or export your calculation history. Use a configurable delimiter (comma, semicolon, or tab) for compatibility with any spreadsheet. - Pro Time Math - Add, subtract, multiply, and divide time values effortlessly. - Flexible Time Input - Enter time your way: 1h30m, 1:30, or 1,30. The app intelligently understands your input. - Instant Decimal Conversion - Instantly switch between standard time (1h 30m) and decimal hours (1.5 hrs), with customizable decimal precision. - Multi-line Display - Keep track of complex calculations with a clear, scrollable display where each new operation appears on its own line. - Quick Copy - Tap to copy the final result to your clipboard with a single tap. - Full Customization - Tailor the app to your workflow with settings for appearance (Light/Dark/System), decimal precision, comma interpretation, and CSV formats. - Smart & Robust - Handles negative time values and seconds with perfect formatting. PERFECT FOR: - Pilots: Logging flight hours and calculating block time. - Freelancers & Consultants: Tracking billable hours and creating invoices. - Project Managers: Calculating project durations and resource timing. - Anyone: Converting time formats, adding up timesheets, or any task that involves time math. No ads. No subscriptions. Your data is 100% private and never leaves your device.

Screenshots

ACE Checklist Editor4 screens
ChronoCalc Pro2 screens

Verdict

The call

The clearest difference is in-app purchases: ChronoCalc Pro at none against ACE Checklist Editor's 10. ChronoCalc Pro also leads on iOS requirement (16.6 vs 18.0). On price, update cadence, ads 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. ACE Checklist Editor sells 10 in-app purchases, starting at $5.99 per month. ChronoCalc Pro asks for nothing beyond the download.

UpkeepUpdate frequency

ACE Checklist Editor ships an update every 4 days, ChronoCalc Pro every 8 days. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

Scorecard2 real differences · 8 level
ACE Checklist Editor versus ChronoCalc Pro: the parameters behind the verdict, then further details
ParameterACE Checklist EditorChronoCalc Pro
PriceFreeFree
Rating3.8 (4 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 4 days — betterEvery 8 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.6 — better
Further details — not scored
Size13 MB4 MB
Age rating4+4+
DeveloperPatrick MichalinaERLEND JOHNSRUD VAAGE

In-app purchases

10 purchases

ACE Checklist Editor

Subscriptions2
  • ACE Pro Monthly$5.991 Month
  • ACE Pro Annual$49.991 Year
One-time8
  • Fly Mode (Lifetime)$4.99
  • PDF Export (Lifetime)$9.99
  • Beechcraft Baron B55 (BE55)$9.99
Show 5 more
  • Beechcraft Baron B58 (BE58)$9.99
  • Beechcraft Baron B58P (B58T)$9.99
  • Beechcraft Duchess (BE76)$9.99
  • Piper JETPROP (PA46) Checklist$9.99
  • ACE File Access (Lifetime)$99.99
None

ChronoCalc Pro

No in-app purchases

Questions

Is ACE Checklist Editor free?
ACE Checklist Editor is free to download, with in-app purchases available.
Is ChronoCalc Pro free?
ChronoCalc Pro is free to download, with no in-app purchases.
Do ACE Checklist Editor or ChronoCalc Pro have ads?
Neither ACE Checklist Editor nor ChronoCalc Pro shows ads.
Which is updated more often, ACE Checklist Editor or ChronoCalc Pro?
ACE Checklist Editor ships an update every 4 days, and ChronoCalc Pro every 8 days. Most recently, ACE Checklist Editor was updated on October 17, 2026 and ChronoCalc Pro on October 19, 2026.

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