CalcEngineer vs BUNKO Notes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalcEngineer
This app provides professional engineering calculations for compressed air systems. It helps engineers and technicians determine CFM requirements, size compressors and tanks, and analyze pressure drops for optimized pneumatic systems.
- CFM Calculator
- Compressor & Tank Sizing
- Pressure Drop Analysis
- Flow Velocity & Pipe Sizing
- Multiple CFM Entries
- General Engineering Calculator Suite
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CalcEngineer - Professional Engineering Calculators The ultimate compressed air system calculator for engineers, technicians, and professionals. Calculate CFM requirements, size compressors and tanks, analyze pressure drops, and optimize your pneumatic systems with engineering-grade precision. KEY FEATURES: • CFM Calculator - Air actuator airflow calculations with real-time results • Compressor Sizing - Size compressors for your specific air demands • Tank Sizing - Calculate air receiver tank requirements and capacity • Pressure Drop Analysis - Determine pressure loss in pipes and fittings • Flow Velocity Calculator - Calculate fluid velocity for optimal system design • Pipe Sizing - Optimize pipe diameter selection for efficiency • Multiple CFM Entries - Add multiple air demands for complex systems • Engineering Calculator Suite - Additional tools for mechanical, electrical, chemical, and thermal engineering PROFESSIONAL TOOLS: • Real-time calculations using industry-standard formulas • Pre-filled values that transfer between calculators • Imperial and metric unit support with automatic conversion • Engineering-grade accuracy for professional applications • Clean, intuitive interface designed for daily use PERFECT FOR: • Industrial engineers and maintenance teams • System designers and consultants • Engineering students and educators • Manufacturing and facility managers • HVAC professionals and technicians Built by Justin Bush | JB CRE8IV - Professional engineering calculation solutions.
BUNKO Notes
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Bunko — Your Personal Knowledge Library Bunko helps you organize ideas, research, and collections into a beautifully structured library. Create collections, divide them into chapters, and build detailed pages that keep your information clear and easy to navigate. Whether you're organizing research, worldbuilding notes, study materials, or personal archives, Bunko gives you a powerful system to structure your knowledge. Organize Information Your Way • Create unlimited collections • Divide collections into chapters • Build detailed pages of structured information • Store images and references alongside your notes • Keep your information organized and searchable Designed for Thinkers and Creators Bunko works perfectly for: • research and study notes • worldbuilding and writing projects • personal archives and collections • tabletop gaming references • hobby catalogs and documentation Powerful Import & Backup Tools Import structured data to quickly create collections, chapters, and pages. Bunko also includes backup tools so your library stays safe and portable. Premium Features Upgrade to Bunko Premium to unlock advanced tools including: • spreadsheet import for rapid collection creation • enhanced themes and visual customization • advanced export and backup options Your Library, Your Structure Bunko is designed to give you complete control over how information is organized. Build a knowledge system that grows with you.
Screenshots
Verdict
The clearest difference is in-app purchases: CalcEngineer at none against BUNKO Notes's 1. BUNKO Notes's advantage is iOS requirement (15.1 vs 17). 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
Both are free to download. BUNKO Notes sells 1 one-off in-app purchase. CalcEngineer asks for nothing beyond the download.
CalcEngineer ships an update every 2 days, BUNKO Notes every 3 days. The most recent releases landed on September 12, 2026 and September 20, 2026 respectively.
| Parameter | CalcEngineer | BUNKO Notes |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 days — better | Every 3 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17 | 15.1 — better |
| Further details — not scored | ||
| Size | 10 MB | 105 MB |
| Age rating | 9+ | 4+ |
| Developer | Justin Bush | ZACHARY MASON KELLER |
In-app purchases
CalcEngineer
No in-app purchases
BUNKO Notes
- BUNKO Pro Lifetime$4.99









