# Certi vs Stack Heavy

The clearest difference is rating: Stack Heavy at 5.0 against Certi's 4.0. Stack Heavy also leads on ratings volume (12 vs 4). Certi's advantage is update cadence (every 3 days vs weekly). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Stack Heavy holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 12 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Certi ships an update every 3 days, Stack Heavy weekly. The most recent releases landed on September 26, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Certi | Stack Heavy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/certi-lock/id6745152014/reviews) | **[5.0 (12 ratings)](https://appshunter.io/ios/app/stack-heavy/id6771520255/reviews)** |
| Number of ratings | 4 | **12** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free | Free |
| Size | 39 MB | 10 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Scottsdale Mint LLLP](https://appshunter.io/developer/1078693720) | [Silver Seeker](https://appshunter.io/developer/6771520527) |

## What reviewers say

### Certi

[App page](https://appshunter.io/ios/app/certi-lock/id6745152014)

This app uses synthetic DNA technology to authenticate precious metals, providing instant verification of gold and silver investments. Scan a card to see factory-sealed photos and confirm the authenticity of your items, ensuring peace of mind for investors.

**Highlights:** Synthetic DNA authentication, Barcode scanning, Factory-sealed product photos, Tamper-evident seal verification, Collection tracking, Instant results, Dark mode

**Features:** macOS Compatibility

**In-app purchases:** none


### Stack Heavy

[App page](https://appshunter.io/ios/app/stack-heavy/id6771520255)

This finance app provides real-time precious metal prices and dealer premium tracking. It offers tools to calculate melt values and premiums, helping users find the best deals on bullion and coins. No account or subscriptions are needed.

**Highlights:** Live spot prices for precious metals, Dealer premium tracking, Melt value calculator, Premium calculator with shipping/fees, Automatic updates, No account required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Certi free?

Certi is free to download, with no in-app purchases.

### Is Stack Heavy free?

Stack Heavy is free to download, with no in-app purchases.

### Which has better reviews, Certi or Stack Heavy?

Stack Heavy is rated higher. Certi averages 4.0 out of 5 from 4 ratings, while Stack Heavy averages 5.0 from 12 ratings.

### Do Certi or Stack Heavy have ads?

Neither Certi nor Stack Heavy shows ads.

### Which is updated more often, Certi or Stack Heavy?

Certi ships an update every 3 days, and Stack Heavy weekly. Most recently, Certi was updated on September 26, 2026 and Stack Heavy on September 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*