iSafe Folder vs Stringline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSafe Folder
Securely store and organize your private files, including photos, videos, and documents. Customize your lock screen with gestures and import files from various cloud services and devices. Manage your data with renaming, archiving, and sorting options.
- Customizable gesture lock screen
- Import from cloud services
- Organize and manage files
- Support for various file types
- Dark and Light mode options
- Drag and Drop support on iPad
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Add a new layer of privacy to your Data. Lock, organise and read your files, audio, video (mp4, avi, MOV), photos, documents (Office, Pages, Numbers, Keynotes, pdf,...) Support Drag and Drop (multitasking) on iPad - Customizable gesture lock screen • customize the size your gesture grid • customize the length of your passcode up to 25 points on iPad, 16 on iPhone - Import from : • iOS App, • itunes sharing, • iCloud, • AirDrop, • Dropbox, • Mega, ... - Rename, archive (zip), share your files, move them to different folders - Sort your files/folders by name or type - Choose between Dark-mode or Light-mode display TRY FOR FREE term of use: http://i-arun-softwares.com/TermsOfService.html
Stringline
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Construction calculator that works in feet, inches, and fractions — matched to 1/64". Download for free. No subscription. No ads. Works offline. 14 SPECIALTY CALCULATORS Stair Layout — rise, run, stringer, angle. IRC and OSHA code check built in. Concrete — cubic yards and bag counts for slabs, footings, columns. Rafter Length — common, hip/valley, jack. Plumb cut, seat cut, overhang. Equal Spacing — every position for studs, balusters, posts, joists. Compound Miter — blade tilt and miter angle for crown and trim. Studs / OC — count and positions for any wall at 16" or 24". Pitch / Slope — pitch, degrees, grade, and roof factor. Baluster Spacing — count, gap, and positions. IRC 4" sphere test built in. Board Feet — lumber volume from nominal dimensions. Drywall Estimator — sheets, waste factor, and opening deductions. Roofing Calculator — squares, bundles, and sheathing for any roof pitch. Right Triangle — check square on any corner. Two sides in, all angles out. Area & Volume — rectangles, circles, triangles, trapezoids. Conversions — feet-inches, decimal feet, metric. HOW IT WORKS Three calculators are yours to keep — Right Triangle, Area & Volume, and Conversions — with the full keypad, memory, and paper tape. No limits, no catch. The other 11 Pro calculators (stairs, concrete, rafters, and more) come with 5 uses so you can try them on a real job. One purchase unlocks everything permanently. YOUR TAPE READS FRACTIONS. SO DOES STRINGLINE. Enter 12' 3-1/2" exactly how you say it. No converting to decimals, no rounding surprises. Integer 64ths arithmetic — every answer matches your tape, not a floating-point guess. BUILT TO BE TRUSTED • Shows the math — step-by-step so you can verify every answer • IRC and OSHA validation with code section citations • Every formula verified against building code standards before release • Paper tape and full calculation history • PDF export with Show My Work steps • Works completely offline — no internet, no accounts No subscription. No ads. Built for tradespeople who can't afford a wrong number.
Screenshots
Verdict
The clearest difference is update cadence: Stringline at every 2 weeks against iSafe Folder's every 6 months. iSafe Folder's advantage is iOS requirement (11.0 vs 15.1). On price, ads, 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. iSafe Folder sells 1 one-off in-app purchase and Stringline sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
iSafe Folder ships an update every 6 months, Stringline every 2 weeks. The most recent releases landed on September 17, 2026 and June 27, 2026 respectively.
| Parameter | iSafe Folder | Stringline |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 27 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Laurent Bottigliengo | Hector Sahagun |
In-app purchases
iSafe Folder
- Unlimited Usage$3.99
Stringline
- Stringline Pro$2.99





