# PostProof: Video Safe Zone — Check captions before export

> Check captions before export (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/postproof-video-safe-zone/id6768481387 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Photo & Video, Productivity
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-05-12
- Data updated: 2026-10-03
- User reviews in markdown: https://appshunter.io/ios/app/postproof-video-safe-zone/id6768481387/reviews.md

## What is PostProof?

NEW — Retention Radar: a whole-clip pacing timeline that finds the boring middle. Motion-energy curve, scene-cut count, and located dead spots with timestamps, all measured on device.

PostProof is a final-pass video checker for creators who want to catch publishing problems before export.

Import a short-form video, pick a generic layout, and PostProof shows pixel-accurate safe zones, stylized feed controls, caption risk with coverage percentages, face risk, cover options, trim controls, export settings, and a publish-readiness plan in one focused workflow.

What you can do with PostProof:

- preview a clip inside a generic short-form video overlay
- run FrameCheck to see whether text, faces, or details may be covered
- compare coverage results across the bundled layouts
- get a ranked Publish Readiness Plan with the highest-priority fixes first
- review safe-zone, audio, readable-text, frame-fill, cover, and Stop Score checks together
- get a Stop Score, muted-readability score, loop score, and tap-to-open score breakdowns
- place a short caption that snaps inside the center-safe area
- browse an offline specs cheat sheet for aspect, duration, resolution, bitrate, and frame rate
- use bundled caption prompts and tags for drafting posting copy
- choose a cover frame scored on exposure, sharpness, contrast, and subject presence
- trim the start and end before export
- export a 720p or 1080p posting copy
- save each run to a local Proofs history
- see a Stop Score trend chart across saved proofs
- compare two saved proofs side by side
- open a full detail sheet with score breakdowns and caption copy

Layouts use generic, layout-descriptive names such as Tall-Caption Vertical, Right-Rail Vertical, Title-Bar Vertical, and Square Timeline. PostProof uses no social-platform brand names.

PostProof is not a social network and does not post for you. It is the quick check before you upload: make sure the caption is readable, the face stays clear, the cover is strong, and the clip is ready to share.

Privacy is simple:

- no account required
- no developer cloud
- no analytics SDK
- no advertising SDK
- no tracking
- video analysis runs on device

PostProof is not affiliated with, endorsed by, or sponsored by any social media platform.


## Version history (last 5 releases)

### 2.2.1 — 2026-09-29

A clearer App Store name and search details. No other changes in this update.

### 2.2 — 2026-08-19

New — Retention Radar. PostProof now watches your WHOLE clip, not just the hook. A motion-energy timeline across the entire video shows where viewers are most likely to bounce, flags the dead spots (still, near-silent stretches) with exact timestamps, counts your cuts and average shot length, and hands a slow open or flat ending straight into Trim & Ship. It's the pacing read no other pre-publish tool gives you — and like everything in PostProof, it runs entirely on device. No account, no upload.

### 2.1 — 2026-06-30

## Publish Readiness Plan

PostProof now builds a ranked pre-export checklist from the same analysis engines creators already use in the app. The plan combines layout collision risk, cross-layout safety, loudness, readable text dwell time, frame fill, cover quality, and Stop Score into one readiness score with the most important fixes first.

## Cleaner Decision Flow

The new readiness panel sits near FrameCheck so creators can move from "what is wrong?" to "what should I fix first?" without hunting across separate panels. Each issue includes a status, plain-English detail, and a concrete fix.

## Store Package Refresh

Version 2.1 includes updated App Store copy, support documentation, privacy documentation, and fresh screenshots that show the current creator QA workflow in use.

### 2.0.1 — 2026-06-25

This update sharpens the interface: the iPad layout now uses a centered, comfortable reading width instead of stretching edge to edge, plus small display fixes. iPhone is unchanged.

### 2.0 — 2026-06-21

PostProof 2.0 — a pro upgrade for your final pre-post check, still fully offline and on-device.

• Loudness & silence check: integrated loudness and true-peak vs. the short-form sweet spot, with a clear too-quiet / clipping verdict.
• Text dwell-time checker: flags on-screen text that flashes by too fast to read, line by line.
• Letterbox / pillarbox detector: catches black bars that read as a lazy cross-post and cut your reach.
• "Works everywhere?" cross-layout report: tests your text against every platform's chrome in one pass.
• Cover-frame audit: exposure, sharpness, contrast, a credibility cue, and safe placement for your first frame.
• Export a PDF proof report bundling every score and fix.

No account, no network, no uploads — your clip never leaves your device.

## Apps similar to PostProof

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Local SlowMo Frame](https://appshunter.io/ios/app/local-slowmo-frame/id6773303060) | — | Free | Photo & Video |
| [Map Timestamp Camera](https://appshunter.io/ios/app/map-timestamp-camera/id6772458296) | — | Free | Photo & Video |
| [AI Photo Enhancer - FixIt](https://appshunter.io/ios/app/ai-photo-enhancer-fixit/id6756921700) | — | Free | Photo & Video |
| [Vivi - Merge Videos](https://appshunter.io/ios/app/vivi-merge-videos/id6468379078) | 5.0 (3) | Free | Photo & Video |
| [SplitCam: Dual Recorder](https://appshunter.io/ios/app/splitcam-dual-recorder/id6761194664) | 4.0 (2) | Free | Photo & Video |
| [ID Photo: Passport Photo](https://appshunter.io/ios/app/id-photo-passport-photo/id6741071388) | 5.0 (8) | $2.99 | Photo & Video |

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-03.*