BulletCalc3 vs Chronverter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BulletCalc3
Calculate ballistic trajectories for firearms with detailed charts and data. Offers metric and imperial units, automatic calculation of bullet drop, energy, and velocity at various ranges. Includes features for adjusting gun sight zero and measuring slant angles.
- Metric/Imperial unit support
- Dynamic ballistic charts
- Automatic FPS/Energy/Drop calculation
- Gun sight zero adjustment
- Slant angle measurement
- Web search for bullet specs
- Export distance data
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Calculate your Ballistics like a Pro! BulletCalc3 does it all.....Metric / Imperial / or Metric AND Imperial!! Generate Dynamic Ballistic CHARTS w/ "GRAPH DATA" Button -> also featuring Ranges of 100 yards / 200 yards / 300 yards / & 500 yards! **Gravity on Earth is Very Reliable & Limits the Distance a Heavier-than-Air Object Can be Thrown at a Given Speed -> Throwing FARTHER requires Throwing FASTER & Sometimes HIGHER -> Evaluate your FORWARD PASS w/ BulletCalc3 & Develop an Arm like a Cannon!!!......or Just Evaluate a REAL Cannon!! BulletCalc3 will Automatically Calculate FPS / Bullet Energies / Bullet Drop due to Gravity at 100 / 200 / 300 / 400 / 500 / 1000 yards!!! *note: the Aerodynamic Drag Coefficient Used is Exclusive to BulletCalc3, and may vary from Published Values. ++ Aerodynamic Drag Values can be Calibrated or Fine-Tuned using Trajectory Data Published on Ammunition Boxes....or also via Range Observations w/ Chronograph & Bench Mount -> Resulting in Improved Ballistic Model Performance at ANY Distance ++ Sound Barrier Turbulence & Bullet Shape Related Aerodynamic Fluctuation are Known Phenomenon affecting ALL Ballistic Calculators -> BulletCalc3 utilizes Simplicity as the Best Approach for Minimizing Model-to-Measurement Variation in FAST Smartphone Based Ballistic Calculation Don't know what the specs on that Bullet Cartridge are? Use the "Web Search" button to pull up all of the information you're missing right from the Shooting Range Calculate Instantaneous Velocities and Energies at any Range Distance you want to! Now you're the Expert!! -Located in "GRAPH DATA" >>> MOA [Minute of Arc] -> mrad [milliradians] -> Gun Sight ZERO Setting [yards] -> Yards / mil & Meters / mil **to Adjust Gun Sight ZERO -> [Press "CHANGE UNITS" Button] -> [Scroll to Bottom] -> [Adjust Value] -> [Press "SAVE UNITS"] >>> Gun Sight ZERO sets Parabolic Gravitational Arc by using Raw MUZZLE Velocity as a Horizontal Vector -> Slower Speeds w/ Longer Gun Sight ZERO = Taller Parabolic Arc *which Corresponds to Higher Firing Angle -"RIFLEMAN'S RULE" & Tiltmeter Accelerometer Feature -> Located in "Change Units" MENU **Easily measure Slant ANGLE of a Hill & Automatically Calculate Rifleman's Horizontal Distance from Slant Range Laser Rangefinder Value ***Pressing "EXPORT Distance" Button Updates the Bullet Drop Calculation & Dataset -INTERACTIVE TextField to Ballistic Charts "GRAPH DATA" Feature -> Calculation Parameters Description **this GRAPH Description Auto-Populates when "CALCULATE" Button is Pressed or CALIBER is Selected from MENU ***Description Data Includes -> Caliber Information / Muzzle Velocity / Projectile Mass / Aerodynamic Drag Coefficient -> [Tap "CALCULATE"] or [Select a CALIBER from MENU] -> [Tap "GRAPH DATA"] -> [Scroll Down to CHART DESCRIPTION Text Field below TOP GRAPH] -> [Modify DESCRIPTION as Desired] -GRAPH Description Feature -> Copy-Paste-to-Clipboard **to COPY Ballistic Parameters: "Tap mrad [milliradians] -> MOA [Minute of Arc] -> yards / mil" -> Text will Flash RED ***PASTE Clipboard -> to Notes, Text Messages, Email, etc >>> to Describe Ballistic CHART
Chronverter
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Chronverter is the essential tool for air gun and airsoft enthusiasts who need fast, accurate ballistics conversions on the field or at the range. Point your chronograph, enter the reading, and instantly see how your muzzle velocity translates across every common ammo weight — all in one clean, tactical interface. What It Does Feed Chronverter a single velocity reading and it calculates the equivalent speed and muzzle energy for every ammo weight you care about, using the industry-standard kinetic energy conversion formula. No more mental math. No more spreadsheets. Key Features - Instant multi-weight conversion — See FPS, M/S, and Joules for all your ammo weights simultaneously in a clean, colour-coded table - FPS & M/S support — Switch between feet-per-second and meters-per-second with a single tap; input and output update instantly - Reference-row highlighting — The weight you measured is highlighted in amber so you can always see your baseline at a glance - Custom ammo weights — Add or remove weights to match your exact loadout; changes are saved automatically - Persistent settings — Your last-used ammo weight, velocity unit, and caliber are remembered between sessions - Caliber tracking — Log your barrel bore diameter in millimeters using the precision stepper or by typing directly - Minimal, high-contrast UI — Designed for bright outdoor conditions with a dark tactical theme and large, readable numbers - Chronograph Link — Connect Chronverter directly to your HT-X3005 or HT-X3006 WiFi chronograph and watch your shots come in live Who It's For - Airsoft players verifying field limits before a game - Air gun shooters comparing pellet performance - Tech players and gun tuners optimizing velocity for different ammo weights - Event referees or marshals performing quick field checks
Screenshots
Verdict
The clearest difference is price: Chronverter at Free against BulletCalc3's $0.99. BulletCalc3's advantage is iOS requirement (15.6 vs 18.0). On update cadence, ads, in-app purchases 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
Chronverter is free to download; BulletCalc3 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.
| Parameter | BulletCalc3 | Chronverter |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 6 MB | 4 MB |
| Age rating | 17+ | 4+ |
| Developer | Jack McCormack | Arthur Christopher Belmonte |
In-app purchases
BulletCalc3
No in-app purchases
Chronverter
No in-app purchases









