GridFix vs SnapLine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GridFix
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Tilt your camera up at a building and the verticals lean inward. Let your hand tip and the horizon goes crooked. GridFix fixes this the most intuitive way possible: draw guide lines along the edges that should be straight, and the app computes the perspective correction that makes them truly vertical and horizontal. And now, you can get it right at the moment you shoot. LIVE-CORRECTED CAMERA - The corrected image shows live in the viewfinder. What you see is what you get, no guesswork afterwards - A tilt readout shows your pitch and roll at all times - Correct verticals only, or auto-level the horizon as well - Pinch to zoom, EV compensation scale, long-press AE/AF lock, self-timer, volume-button shutter - Level sensor calibration: a fixed offset from your case or sensor tolerance is measured once and subtracted from then on - The session gallery lets you review shots, compare with the original, or send one straight into the editor EDIT IMPORTED PHOTOS - Guide-line correction: no blind slider fiddling, just show the app which lines should be straight - Double-tap to zoom: magnify right where you are working and trace window frames and beams precisely - A loupe keeps the edge visible while you drag, positioned for right- or left-handed use - Lens distortion correction: fixes the outward bow of ultra-wide edges, which perspective correction alone cannot fix - Fine-tuning: adjust every axis manually after the correction - Crop, rotate, flip, and auto-trim the blank edges correction leaves behind - Edit history: every session is saved automatically, so you can reopen and continue any time IMPORT AND EXPORT - Import from Photos, Files and iCloud Drive, or share into GridFix from any other app - Export JPEG, HEIF, PNG or TIFF, at original resolution or a custom size - Everything runs on your device: no account, no network, your photos never leave your phone FREE AND SUBSCRIPTION Every correction tool is free: guide lines, lens distortion, fine-tune sliders, cropping and the live-corrected camera are all fully usable, with unlimited viewfinder time. The limits are only on output: 3 editor exports a day, 10 camera saves a day, both at up to 2048px on the long edge, JPEG, without capture info or location (the capture date and orientation are kept). Subscribing unlocks: - Unlimited exports and unlimited camera saves - Original-resolution export (up to 48MP; the free tier caps the long edge at 2048px) - RAW import (ProRAW, DNG); PNG, TIFF and HEIF export at maximum encoder quality - Full EXIF kept on exports and captures (lens, exposure, location) - Live-corrected video recording (high-bitrate HEVC) GridFix does one thing well: it makes crooked lines straight. No color grading, no filters, no object removal. Available in English, Traditional Chinese, Simplified Chinese, Japanese, Korean, German, French and Spanish. Privacy Policy: https://gridfixapp.com/policy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
SnapLine
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Lay a camera grid over your photo and place it with an eye for composition. Send the lines behind your subject and the grid steps into the scene. It stops being an overlay and becomes part of the photo. ■ The grid moves into the photo • Rule-of-thirds grid to start from • Middle points that bend each line • End anchors that tilt each line • Extra bend points and rounded curves • Erasing where a line crosses your subject • Auto mask to find your subject ■ Fine work • Zoom up to 8× • Fine brush size control • Loupe under your fingertip • Undo and redo Saves at the full resolution of your original. Exports carry a small SnapLine mark in the corner, and SnapLine Pro removes it. ■ SnapLine Pro advanced features • Saving without the mark • Dashed, double, and glow line styles • Line colors beyond white and black • Snapping to subject corners ■ Privacy • No personal data collected • No sign-up or login Open a photo and let the grid into the scene.
Screenshots
Verdict
GridFix and SnapLine are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. GridFix sells 3 in-app purchases, starting at $2.99 per month and SnapLine sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
GridFix ships an update every 4 days, SnapLine every 6 days. The most recent releases landed on November 5, 2026 and November 13, 2026 respectively.
| Parameter | GridFix | SnapLine |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days — better | Every 6 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | PEI-CHUN CHAO | Dohyun Kim |
In-app purchases
GridFix
- GridFix 訂閱(月繳)$2.991 Month
- GridFix 訂閱(年繳)$14.991 Year
- GridFix 終身買斷$39.99
SnapLine
- SnapLine Pro$1.99








