Calculator S.L.U.Y.S+ vs Protractor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator S.L.U.Y.S+
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Entrust daily usual calc to S.L.U.Y.S! Simple calculator that always performs binary operations. Haven't you experienced? Problem when calc like... 1+2x3=7 Calc S.L.U.Y.S calc like.. 1+2x3=9 Simple, easy to use calc App nice for daily usual calc like consumption tax. Save up to 50 calc progressions and change part of it later. Useful for calculate shopping where the unit price and quantity change little by little each time. Performs two-items calculations with tree-structures in easy operation. Calc progression display, and “Go back” the progression. “Structured calc” in easy operation. “Calc Unit” 2 consumption tax rates. Input order calculation. Not Normal arithmetic order. Always operate on the calculation results up to immediately before. Calc Units ･ Handle “Calc Unit” which is calc progression before pressing “=“. ･ Re-calc “Calc Unit” with correction. ･ Copy-Paste “Calc Unit” with Text format data. ･ Save “Calc Unit” capability ( Up to 50 calcs with + edition ). ･ Load “Calc Unit” and re-calc with correction. ･ Register 2 consumption tax rates Tax included / excluded calc button with 2 types of consumption tax rates. ･ You can change tax rates on “Settings” at anytime. Structured calc ･ Go down and up between hierarchy with “Enter detail” button and “Parent node” button during calculation. Disclaimer ･ Please note that we are not responsible for any loss or damage caused by using this software. ･ We do our best to ensure the accuracy of the calculation results by this software, but we do not guarantee the accuracy.
Protractor
Measure angles precisely using your phone's screen, gyroscope, or camera. Offers smart presets, real-time feedback with high accuracy, and calibration features to adapt to various situations.
- 3-in-1 measurement modes
- Smart angle presets with alerts
- Hyper-responsive feedback (≤0.5° accuracy)
- Auto dynamic compensation calibration
- Anti-shake technology for motion scenes
- Screen lock for measurements
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Ditch bulky tools! Measure angles precisely anywhere with just your phone. *** Features *** ► Full-Scene Precision Measurement * 3-in-1 Modes: Screen Protractor / Gyroscope Protractor/ Camera Protractor, adapt to different scenarios. * Smart Angle Preset: Input target angles for instant deviation alerts. * Hyper-Responsive Feedback: Real-time tracking with ≤0.5° accuracy. ► Triple-Calibration Assurance * Auto Dynamic Compensation: Device-position-aware baseline calibration * Anti-Shake Tech: 80% accuracy boost in motion scenes (Gyroscope Mode) * Screen lock: Freeze measurements instantly to prevent accidental touches. ► Contact Us * Email: ceo@noadit.com
Screenshots
Verdict
The clearest difference is price: Protractor at Free against Calculator S.L.U.Y.S+'s $1.99. Protractor also leads on update cadence (every 5 weeks vs every 3 months). Calculator S.L.U.Y.S+'s advantage is in-app purchases (none vs 2) and iOS requirement (15.5 vs 17.0). On 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
Protractor is free to download; Calculator S.L.U.Y.S+ costs $1.99 up front. Protractor sells 2 one-off in-app purchases. Calculator S.L.U.Y.S+ asks for nothing beyond the download.
Calculator S.L.U.Y.S+ ships an update every 3 months, Protractor every 5 weeks. Both last shipped on November 3, 2026.
| Parameter | Calculator S.L.U.Y.S+ | Protractor |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 1.8 (6 ratings) — better |
| Positive reviews | — | 63.6% of reviews |
| Number of ratings | — | 6 — better |
| Update frequency | Every 3 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.5 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | ImagineSpark Inc. | Noadit, Inc. |
In-app purchases
Calculator S.L.U.Y.S+
No in-app purchases
Protractor
- Bubble Tea$0.99
- Coffee$4.99
Questions
Is Calculator S.L.U.Y.S+ free?
Is Protractor free?
Do Calculator S.L.U.Y.S+ or Protractor have ads?
Which is updated more often, Calculator S.L.U.Y.S+ or Protractor?
Other comparisons
