Comparison

BulletCalc3 vs Barometer ∞ Pressure Altitude

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Barometer ∞ Pressure Altitude

Access your device's built-in barometer for real-time atmospheric pressure and altitude readings. Offers multiple units and works offline without requiring signup or subscriptions.

Highlights
  • Live barometric pressure readings
  • Current altitude display
  • Multiple pressure units (atm, hPa, kPa, Bar)
  • Offline functionality
  • Native iOS design
  • Minimalist interface
Read full description

Your iPhone already has a barometer. Use it. Barometer ∞ gives you instant, accurate atmospheric pressure readings and your current altitude — straight from the device's built-in sensor. No signup, no subscription, no fuss. • Live barometric pressure, updated in real time • Current altitude in meters, powered by the same sensor pilots trust • Four pressure units — pick Standard Atmosphere (atm), Hectopascals (hPa), Kilopascals (kPa), or Bar • Works offline — no internet or location required to read pressure • Native iOS design built for iOS 17 and later • Tiny download and zero clutter Great for: — Hikers and climbers curious about elevation — Weather watchers tracking pressure shifts — Students, teachers, and anyone learning about atmospheric science — Anyone who wants a clean, fast reading without wading through ads-riddled "pro" alternatives Barometer ∞ is intentionally simple. It does one thing — show you what your iPhone's pressure sensor sees — and it does it instantly. No cluttered dashboards, no weather forecasts you didn't ask for, no dark-pattern paywalls. Privacy Policy: https://triplegelato.notion.site/Privacy-Policy-182d18371d6181b588d4ed7dbd0ba832 Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

BulletCalc34 screens
Barometer ∞ Pressure Altitude1 screens

Verdict

The call

The clearest difference is price: Barometer ∞ Pressure Altitude at Free against BulletCalc3's $0.99. Barometer ∞ Pressure Altitude also leads on rating (5.0 vs 3.0). BulletCalc3's advantage is ads (none vs shown) and update cadence (every 2 months vs every 10 months). On ratings volume and in-app purchases 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

Barometer ∞ Pressure Altitude is free to download; BulletCalc3 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Barometer ∞ Pressure Altitude holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

BulletCalc3 ships an update every 2 months, Barometer ∞ Pressure Altitude every 10 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 2 level
BulletCalc3 versus Barometer ∞ Pressure Altitude: the parameters behind the verdict, then further details
ParameterBulletCalc3Barometer ∞ Pressure Altitude
Price$0.99Free — better
Rating3.0 (2 ratings)5.0 (1 ratings) — better
Number of ratings2 — better1
Update frequencyEvery 2 months — betterEvery 10 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better17.0
Further details — not scored
Size6 MB16 MB
Age rating17+4+
DeveloperJack McCormackFawkes Wei

Customer experience

BulletCalc3

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

Barometer ∞ Pressure Altitude

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

BulletCalc3

No in-app purchases

None

Barometer ∞ Pressure Altitude

No in-app purchases

Questions

Is BulletCalc3 free?
BulletCalc3 costs $0.99, with no in-app purchases.
Is Barometer ∞ Pressure Altitude free?
Barometer ∞ Pressure Altitude is free to download, with no in-app purchases.
Which has better reviews, BulletCalc3 or Barometer ∞ Pressure Altitude?
Barometer ∞ Pressure Altitude is rated higher. BulletCalc3 averages 3.0 out of 5 from 2 ratings, while Barometer ∞ Pressure Altitude averages 5.0 from 1 ratings.
Do BulletCalc3 or Barometer ∞ Pressure Altitude have ads?
Barometer ∞ Pressure Altitude shows ads; BulletCalc3 does not.
Which is updated more often, BulletCalc3 or Barometer ∞ Pressure Altitude?
BulletCalc3 ships an update every 2 months, and Barometer ∞ Pressure Altitude every 10 months. Most recently, BulletCalc3 was updated on October 24, 2026 and Barometer ∞ Pressure Altitude on October 30, 2026.

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