Comparison

Carpentry Formulator vs PsychWatch

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

Head to head
About

Carpentry Formulator

This app provides over 150 formulas and dozens of conversions for carpenters and builders. It calculates loads on walls and headers, material quantities for projects, and dimensions for roofing and stairs. It also includes area and volume calculations for various shapes.

Highlights
  • Load calculations for walls and headers
  • Material quantity estimation (joists, studs, concrete)
  • Roofing and stair dimension calculations
  • Area and volume formulas for geometric shapes
  • Dozens of unit conversion tools
  • Shareable calculation results
Features
Read full description

CARPENTRY FORMULATOR contains over 150 formulas that are useful for carpenters and builders. This app calculates loads on walls and loads on headers.The app calculates space between balusters, wood needed for railings It calculates Hardwood Flooring, calculations on Board Feet and Lumber conversions. It calculates the number of Joists, Sheet Rock, Concrete and Asphalt needed. The program has special sections on Roofing and Stairs. The CARPENTRY FORMULATOR has various formulas to calculate area and volumes of differing shapes. The program also includes dozens of conversions; everything from square feet to square inches and square inches to feet of water. Every result in CARPENTRY FORMULATOR shared. In the coming months there will be updates to CARPENTRY FORMULATOR that will include additional formulas. If there are formulas you would like that are not yet included, just e-mail us and we will try to include it in our next update. LOAD ON WALLS *Load on One Story Building Truss Roof *Load on One Story Building with Attic Stick Built *Load on Two Story Building with Attic Stick Roof *Total Load on Beam *Weight Header Can Carry LUMBER CALCULATION *Cost of Hardwood Flooring *Calculating Board Feet *Lumber Conversions- Board and Linear Feet MATERIALS NEEDED *Number of Joist Required *Number of Studs Required *Sheet Rock Coverage *Asphalt Needed *Cubic Yard of Concrete Needed *Coverage from Concrete ROOFING *Shed roof *Gable roof *Hip roof on square building *Gable Roof Sheathing *Shed Roof Sheeting *Hip Roof Sheeting STAIRS *Number of risers *Unit risers *Unit run *Total run Area Formulas Include: SQUARES *Area *Perimeter *Length of the diagonal RECTANGLES *Area *Perimeter *Length of base *Height *Length of diagonal PYRAMIDS *Pyramid area *Pyramid v *Volume prism SPHERES *Area of surface *Sde of cube *Volume of sphere Cylinder: *Cylinder area *Cylinder length *Volume *Capacity *Area of Cylinder Base *Length of Cylinder CIRCLES *Circumference *Radius *Diameter of Circle *Area of circle *Arc length *Degrees of arcs *Radius of arc CONES *Lateral surface area *Total surface area Ellipse:Area Hexagon:Area Parallelogram Area 200 Conversion formulas

About

PsychWatch

This timer app is designed for professionals administering timed assessments. It offers one-touch controls, hands-free voice commands, and custom test sequences to streamline the process and keep focus on the client.

Highlights
  • One-touch timing with haptic feedback
  • Hands-free voice control
  • Customizable test sequences
  • Automatic test run history logging
  • Personalized display options (light/dark mode)
Read full description

PsychWatch is the stopwatch app built specifically for psychologists and other professionals who administer cognitive and timed assessments. A timer app with simple, intuitive interface lets you keep your attention on your client—not your device. Key Features: • One-touch timing – Large button control timer function controls all timer functions. Bright colors and haptic feedback give you instant but discrete feedback. • Hands-free control – Use voice commands to start, stop, and reset without breaking focus. • Custom test sequences – Preload your timed assessments so you can run through them without manually setting each timer. • Test run history – Automatically logs times so you can skip note-taking during sessions. • Personalized display – Choose light or dark mode and set your preferred timer format. Why PsychWatch? Designed with input from psychologists, PsychWatch helps streamline your testing process. Whether you’re running a single timed task or a full cognitive battery, you’ll save time and mental energy while ensuring accuracy. Free to use. Upgrade once for voice control, unlimited test lists, and more.

Screenshots

Carpentry Formulator4 screens
PsychWatch4 screens

Verdict

The call

The clearest difference is review sentiment: PsychWatch at 100% against Carpentry Formulator's 25%. PsychWatch also leads on rating (5.0 vs 3.8). Carpentry Formulator's advantage is monetization model (free vs free with in-app purchases). On price, ratings volume, update cadence and ads 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. Carpentry Formulator sells 1 one-off in-app purchase and PsychWatch sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

PsychWatch holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews point the same way: 25% of Carpentry Formulator's written reviews are positive against 100% of PsychWatch's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

Scorecard3 real differences · 7 level
Carpentry Formulator versus PsychWatch: the parameters behind the verdict, then further details
ParameterCarpentry FormulatorPsychWatch
PriceFreeFree
Rating3.8 (4 ratings)5.0 (2 ratings) — better
Positive reviews25.0% of reviews100.0% of reviews — better
Number of ratings4 — better2
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.617.0 — better
Further details — not scored
Size23 MB7 MB
Age rating4+4+
DeveloperHistorycentral.comhipmata LLC

Customer experience

Carpentry Formulator

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews8 reviews
Positive25.0%
Neutral12.5%
Negative62.5%

PsychWatch

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Carpentry Formulator

One-time1
  • Professional Features$2.99
3 purchases

PsychWatch

One-time3
  • Premium$3.99
  • Premium$5.99
  • Premium$7.99

Questions

Is Carpentry Formulator free?
Carpentry Formulator is free to download, with in-app purchases available.
Is PsychWatch free?
PsychWatch is free to download, with in-app purchases available.
Which has better reviews, Carpentry Formulator or PsychWatch?
PsychWatch is rated higher. Carpentry Formulator averages 3.8 out of 5 from 4 ratings, while PsychWatch averages 5.0 from 2 ratings.
Do Carpentry Formulator or PsychWatch have ads?
Neither Carpentry Formulator nor PsychWatch shows ads.
Which is updated more often, Carpentry Formulator or PsychWatch?
Carpentry Formulator ships an update every 2 months, and PsychWatch every 2 months. Most recently, Carpentry Formulator was updated on October 6, 2026 and PsychWatch on October 9, 2026.

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