# Seal: Home Canning Safety — Pressure, water bath, altitude

> USDA home canning safety guide with cited recipes and processing times. (iPhone/iPad app by Roman Kopaliani.)

- Source: https://appshunter.io/ios/app/seal-home-canning-safety/id6778012488 (this page in markdown: same URL + `.md`)
- Developer: [Roman Kopaliani](https://appshunter.io/developer/1635315269)
- Category: Food & Drink, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-06-11
- Data updated: 2026-09-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/seal-home-canning-safety/id6778012488/reviews.md

## What is Seal?

Pay once. No subscription, no ads, no account, no AI. Works offline.

Seal is the iOS companion for USDA-tested home canning. Pick a food, set your altitude, and Seal computes the processing time and pressure for your jar size — cited "Per USDA Complete Guide" or "Per NCHFP" inline so you can verify the number against the source. 42 USDA-tested recipes across fruit, tomato, vegetable, meat, fermented, and jam & jelly chapters. Apple recipes show both Ball 38th Edition (2024 acidified) and USDA 2015 sources where the two diverge — Seal never picks a winner.

The Moon Dog wedge for Seal is voice: every number cites the source. No "it is safe to…" framing. The 11-item Pre-process Checklist mirrors Iowa State's "potentially deadly canning mistakes." The symptom-first jar-failure diagnostic answers the canonical "my jar did X, is it safe?" question with 13 USDA / NCHFP / Penn State / Iowa State / CDC-cited rows — bulged-lid and spurting-on-unseal cases lead with the CDC botulism triple-negative ("you cannot see, smell, or taste the toxin") before any disposal copy.

Features
• 42 USDA-tested recipes, each cited to USDA Complete Guide chapter / NCHFP / Ball 38th — verified against NCHFP canonical pages before ship
• Altitude-aware processing: water-bath times extend per USDA Part 1 table; pressure-canner PSI looked up by altitude + gauge type, with explicit warning on the weighted-gauge step from 10 → 15 psi at 1,001 ft
• 11-item Pre-process Checklist (Iowa State Extension) — every recipe run starts here; no timer until all 11 are confirmed
• Process timer with phase prompts (vent → process → cool-down) — voice via AVSpeechSynthesizer, haptic via CoreHaptics, big readable type for hands-busy moments next to the canner
• 13-row symptom-first jar-failure diagnostic — DO NOT OPEN gating on bulged lids and spurting-on-unseal cases with CDC botulism framing
• Recipe-Alteration Check — the 2-hour vs 24-hour correction window mapped to the right gating question ("did you follow a tested recipe exactly?") so an altered recipe never gets routed to the 24-hour reprocess path
• Pumpkin purée and zucchini / summer squash intercepts — both NOT USDA-approved; named warning fires at the food picker before any processing screen loads
• Tomato acidification gate — boundary foods require 2 Tbsp bottled lemon juice per quart or 1/2 tsp citric acid per quart; the timer stays disabled until the user confirms the acidification step
• Jar log (SwiftData, on-device) — batch history with recipe, jar size, altitude, time, PSI, lot number

For home canners working from the USDA Complete Guide to Home Canning, NCHFP, and the Ball Blue Book. Pressure-canner and water-bath users at any altitude.

$6.99 one-time. No subscription, no ads, no account, no cloud.

Privacy: Seal collects nothing. No analytics, no accounts, no network requests. Your batch log and settings live on your device.

Seal presents USDA / NCHFP / Extension guidance for educational purposes. Follow the latest version of any recipe publication (USDA, NCHFP, cooperative extension, Ball) for authoritative safety information. Consult a Master Food Preserver for borderline cases.

What Seal does not do: generate recipes with AI. Generative AI hallucinating canning process times kills people. Seal only surfaces USDA-tested data with the source named on every screen.

## Key features

- USDA-tested recipes with inline citations
- Altitude-aware processing time and pressure calculations
- Pre-process checklist for safety
- Jar-failure diagnostic tool
- Offline functionality
- Recipe alteration checks
- Jar log for batch history

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Seal Pro (lifetime) | $6.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/seal-home-canning-safety/id6778012488/reviews.md

### 5/5 — Nice

*2026-07-03*

been canning for years and always second guessed my times. this just tells me straight up if a batch is safe. no fluff

### 5/5 — Just works

*2026-07-01*

No ads, no subscription nonsense, tells me my jars are safe. That's all I wanted.

## Frequently asked questions about Seal

### What is the price of Seal: Home Canning Safety?

Seal: Home Canning Safety is a paid app with a one-time purchase price of $6.99. There are no subscriptions or ads, and it does not require an account or cloud services.

### Does Seal: Home Canning Safety have ads?

No, Seal: Home Canning Safety is ad-free. The app explicitly states 'no ads' and focuses on providing a secure, offline experience for users.

### What devices does Seal: Home Canning Safety support?

Seal: Home Canning Safety is available for iOS devices, specifically iPhones and iPads. It is designed to work offline on these platforms.

### How often is Seal: Home Canning Safety updated?

The latest version of Seal: Home Canning Safety is 1.3, which was last updated on July 2, 2026. Updates are provided to ensure the app reflects the latest USDA guidance and maintains functionality.

### What is the age rating for Seal: Home Canning Safety?

Seal: Home Canning Safety has an age rating of 4+. This indicates it is suitable for children and adults, with no mature content.

### Can I use Seal: Home Canning Safety without an internet connection?

Yes, Seal: Home Canning Safety works offline. It does not require an internet connection, an account, or cloud services, making it accessible anytime, anywhere.

### What sources does Seal: Home Canning Safety cite for its canning information?

Seal: Home Canning Safety cites USDA-tested recipes and processing times directly from sources like the USDA Complete Guide to Home Canning and the NCHFP. It also references Ball Blue Book and various Extension services for accuracy.

### How does Seal: Home Canning Safety help with potential canning mistakes?

The app includes an 11-item Pre-process Checklist mirroring common mistakes and a symptom-first jar-failure diagnostic. For critical issues like bulged lids, it prominently displays CDC warnings about botulism toxins before offering disposal advice.

## Version history (last 5 releases)

### 1.7 — 2026-08-15

Maintenance update. No feature changes.

### 1.6 — 2026-07-25

• Fixed Restore Purchases so returning customers reliably get their unlock back
• The free trial now shows how much time is left
• Confirmed every processing time against the NCHFP primary sources

### 1.5 — 2026-07-23

Behind-the-scenes improvements for a smoother, faster app.

### 1.4 — 2026-07-16

The number keyboard now has a Done button, so you can dismiss it when you're finished. Thanks to everyone who wrote in about this.

### 1.3 — 2026-07-02

Canning season is here. This update adds a quick-jump list of related Moon Dog kitchen-safety apps in Settings, and refreshes the App Store keywords so folks searching altitude and elevation charts can actually find Seal. Also polished the Pro unlock flow. Stay safe out there — check your altitude, follow the USDA times.

## More apps by Roman Kopaliani

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All apps by Roman Kopaliani: https://appshunter.io/developer/1635315269

## Related topics

[roman baths](https://appshunter.io/ios/topics/roman-baths)

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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 2026-09-08.*