QuiltingCalc vs PerchLens
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
QuiltingCalc
This app offers eight essential quilting calculators to simplify fabric calculations. It helps with conversions, determining fabric needs for backing, borders, and binding, and calculating piece cuts from larger fabric pieces. It also includes specialized calculators for common quilting blocks and triangles.
- Fabric measurement conversion (yards/inches, meters/cm)
- Backing and batting yardage calculation
- Piece cutting from larger fabric
- Binding fabric calculation
- Border fabric calculation
- Square-in-a-square block dimensions
- Triangle calculations for blocks
Read full descriptionHide full description
Robert Kaufman Fabrics and Quilter's Paradise have joined forces to bring you a collection of eight essential quilting calculators. With these calculators you'll be able to quickly convert between yards and inches, meters and centimeters; learn how much fabric you need for backing, batting and borders; and determine how many rectangular pieces can be cut from a larger piece. There are even calculators for square-in-a-square, set-in and corner triangles. Here's a brief description of each calculator: Fabric Measurement Converter: Converts between inches and yards in decimal form, and yards in fractional form. (With metric equivalents.) Backing and Batting Calculator: Determines how much material from a bolt of fabric is needed to make the backing for a quilt. Piece Count Calculator: Shows the number of fixed-sized pieces of fabric that can be cut from a larger piece. Pieces to Area Calculator: Indicates how much fabric is needed in order to cut a given number of fixed-sized pieces. Binding Calculator: Tells you the amount of fabric required to bind your quilt, based on the quilt’s dimensions and the binding strip width. Border Calculator: Shows the amount of fabric required to create borders, based on a quilt’s dimensions and the width of the borders. Square-in-a-Square Calculator: Works out the key dimensions of a square-in-a-square block. Set-in and Corner Triangle Calculator: Determines the size of the square piece you’ll need to cut in order to create both unfinished set-in triangles and unfinished corner triangles.
PerchLens
This app enhances bird watching by integrating camera technology with bird feeders to capture images of visiting birds. It offers enthusiasts an innovative way to observe and engage with local wildlife.
- Camera-enabled bird feeder
- Captures images of visiting birds
- Innovative nature engagement
- High-tech bird watching
- Feathered friends observation
Read full descriptionHide full description
PerchLens leads the way in bird watching innovation. By merging cutting-edge camera tech with classic bird feeders, it captures visiting birds, granting enthusiasts an exclusive peek into our feathered friends' world! It's a complete game-changer in our nature engagement!
Screenshots
Verdict
The clearest difference is review sentiment: QuiltingCalc at 66% against PerchLens's 12%. QuiltingCalc also leads on rating (4.2 vs 1.9). PerchLens's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, ratings volume, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
QuiltingCalc holds the better App Store score, 4.2 against 1.9. Both are backed by a comparable volume of ratings — 125 and 304 respectively. Written reviews point the same way: 66% of QuiltingCalc's written reviews are positive against 12% of PerchLens's.
QuiltingCalc ships an update every 2 months, PerchLens every 3 weeks. The most recent releases landed on September 19, 2026 and September 24, 2026 respectively.
| Parameter | QuiltingCalc | PerchLens |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (125 ratings) — better | 1.9 (304 ratings) |
| Positive reviews | 65.8% of reviews — better | 12.1% of reviews |
| Number of ratings | 125 | 304 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 53 MB | 201 MB |
| Age rating | 4+ | 4+ |
| Developer | Handmade Interactive LLC | POCKET INC |
Customer experience
QuiltingCalc
PerchLens
User reviews
QuiltingCalc
From 125 App Store ratingsWhat we love
- 🎯 Accurate fabric calculations for borders, bindings, and backing
- ⚡ Quick and easy-to-use interface for on-the-go shopping
- 💰 Free app with valuable quilting functionality
- 🔄 Reliable performance for most users over extended periods
- 📱 Helpful tool for beginners learning quilting math
Room to improve
- 🐛 Frequent crashes and freezing issues
- 🐛 App won't open or gets stuck on loading screen
- 🐛 Back button navigation doesn't work properly
- 🐛 Unable to exit app and return to enter new measurements
- ⚠️ Calculation errors for certain fabric widths (especially 108" backing)
PerchLens
From 304 App Store ratingsWhat we love
- 🚀 Easy to use
- 👍 Works well
- 🚀 Feeder works perfectly
- 👍 Accurate AI recognizer
Room to improve
- 🐛 Motion detection too sensitive
- 🐛 Difficult to set up
- 🐛 Unreliable connection
- 🐛 Inaccurate AI bird identification
- 🐛 Camera quality issues
Bugs and requests
QuiltingCalc
Reported bugs
14 issues- App crashes on startup or during use
- Freezes on title/loading screen indefinitely
- Black screen errors when exiting app
- Back button ('<') doesn't function
- Cannot return to previous screens to modify inputs
Show 9 moreShow fewer
- Binding calculator hangs after width selection
- Square-in-square calculator doesn't allow navigation back
- Fabric width validation errors with numbers already entered
- Border 3 validation errors appearing incorrectly
- Inconsistent yardage calculations for same inputs
- App won't open - shows blank screen with spinning wheel
- Incompatibility with iPad 2 and older iOS versions
- Recent update broke previously working functionality
- Two-digit number input not accepted in pieces-to-yardage calculation
Requested features
12 requests- Metric to imperial conversion tool
- Landscape mode and full iPad support
- Default settings for binding strip width (2.5") and border type
- Wide-backing fabric support (108 inch)
- Quilt size templates (baby, lap, throw sizes)
Show 7 moreShow fewer
- Sashing calculation feature
- Backing fabric piecing diagrams with instructions
- Ability to calculate multiple quilts without exiting app
- Inches to centimeters converter
- Ability to enter dimensions larger than fabric width
- Save/store previous calculations
- Tutorial or help documentation within app
PerchLens
Reported bugs
4 issues- Inconsistent video recording and storage
- Inability to connect to Wi-Fi
- Login and account issues
- Compatibility problems with newer OS versions
Requested features
5 requests- Option to turn off AI bird identification
- Improved squirrel deterrent features
- Ability to share videos and photos
- Compatibility with smart home platforms
- Better battery life management
In-app purchases
QuiltingCalc
No in-app purchases
PerchLens
No in-app purchases
