Line vs PDF Maker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Line
This app models the relationship between two variables using linear regression. It fits a linear equation to observed data, calculating the slope, intercept, correlation coefficient, and coefficient of determination to assess the model's fit.
- Linear regression modeling
- Calculate slope and intercept
- Correlation coefficient calculation
- Coefficient of determination (R2)
- Model fit assessment
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The Line-Fit app uses linear regression to model the relationship between two variables (x and y) by fitting a linear equation to observed data. One variable is considered to be an explanatory (independent) variable, and the other is considered to be a response (dependent) variable. A linear regression line has an equation of the form Y = a + bX, where X is the explanatory variable and Y is the dependent variable. The slope of the line is b, and the intercept is a (the value of y when x = 0). To measure the association between the two variables the correlation coefficient is used, which is a value between -1 and 1 indicating the strength of the association of the observed data for the two variables. The coefficient of determination, R2, measures how close the data are to the fitted regression line. In general, higher values of R2 indicate a better fit of the model to the given data. R2 is always positive and equal to 1.0 for a perfect fit.
PDF Maker
Easily convert various file types, including documents and photos, into PDF format directly on your device. This app offers advanced tools for merging, splitting, and compressing PDFs, along with options to add content and share your creations.
- Convert DOC, XLS, JPG, TXT, PPT, SVG to PDF
- Create new PDFs from photos or text
- Merge and split PDF files
- Compress PDF files
- Preview, export, and share PDFs
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PDF Maker is a tool to convert any file from DOC, XLS, JPG, TXT, PPT, SVG to PDF easily. Make PDF files right on your iPhone using PDF Converter. Features: Pick DOCX, PPTX, XLSX file on your phone and convert to PDF in seconds Add photo or text to create a new PDF file Use advanced PDF tools: Merge, Split, Compress Preview, Export or Share PDF files to other apps Privacy Policy: https://kupertinolabs.com/privacy-policy Terms of Use: https://kupertinolabs.com/terms-of-use
Screenshots
Verdict
The clearest difference is rating: PDF Maker at 4.6 against Line's 3.7. PDF Maker also leads on update cadence (every 4 months vs every 41 months) and review sentiment (29% vs 0%). Line's advantage is in-app purchases (none vs 5). On price, ads, device support and iOS requirement 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. PDF Maker sells 5 in-app purchases, starting at $6.99 per 7 days. Line asks for nothing beyond the download.
PDF Maker holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: PDF Maker has 1.2K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 0% of Line's written reviews are positive against 29% of PDF Maker's.
Line ships an update every 41 months, PDF Maker every 4 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | Line | PDF Maker |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) | 4.6 (1.2K ratings) — better |
| Positive reviews | 0.0% of reviews | 28.6% of reviews — better |
| Number of ratings | 3 | 1.2K — better |
| Update frequency | Every 41 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 140 MB |
| Age rating | 12+ | 4+ |
| Developer | Bjarne Berge | Muhammet Yalcın Ozdemir Halil Ibrahim Karahan Mustafa Ayten Kupertino Bilisim Yazılım K.S |
Customer experience
Line
PDF Maker
In-app purchases
Line
No in-app purchases
PDF Maker
- Weekly Premium3 Days trial$6.997 Days
- Monthly Premium$9.991 Month
- Secret Discount Pro$24.991 Year
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- PDF Converter3 Days trial$29.991 Year
- Yearly Premium$49.991 Year
