# hey abby vs VPD Chart

The clearest difference is rating: VPD Chart at 4.5 against hey abby's 3.4. VPD Chart also leads on review sentiment (74% vs 36%). hey abby's advantage is in-app purchases (none vs 2) and ratings volume (107 vs 30). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. VPD Chart sells 2 in-app purchases, starting at $3.99 per month. hey abby asks for nothing beyond the download.

VPD Chart holds the better App Store score, 4.5 against 3.4. Both are backed by a comparable volume of ratings — 107 and 30 respectively. Written reviews point the same way: 36% of hey abby's written reviews are positive against 74% of VPD Chart's.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | hey abby | VPD Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (107 ratings)](https://appshunter.io/ios/app/hey-abby/id1594778711/reviews) | **[4.5 (30 ratings)](https://appshunter.io/ios/app/vpd-chart/id6470015847/reviews)** |
| Number of ratings | **107** | 30 |
| Positive reviews | 35.7% of reviews | **73.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 90 MB | 49 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [CL Design Studio LLC](https://appshunter.io/developer/1594778713) | [INNOVO DEV S.R.L.](https://appshunter.io/developer/1814828527) |

## What reviewers say

### hey abby

[App page](https://appshunter.io/ios/app/hey-abby/id1594778711)

This app guides users through plant cultivation from seed to harvest with step-by-step video instructions. It offers tools to track plant progress, maintain detailed grow diaries with data charts, and manage climate settings.

**Highlights:** Step-by-step video grow instructions, Plant progress tracking, Detailed grow diaries, Climate management tools, Grow community access

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use for beginners
- 👍 Self-explanatory system
- 👍 App guides users through steps
- 👍 Good for keeping track
- 👍 Nice and smart grow box app

**What reviewers complain about**

- 🐛 App is buggy and unreliable
- 🐛 Frequent app crashes and freezes
- 🐛 Difficult to navigate and find instructions
- 🐛 App logs users out frequently
- 🐛 Poor customer support experience

**Reported bugs**

- App keeps changing settings
- Light panel went out
- App skipped drying process
- Cannot get box temp under 75 degrees
- App logs out frequently

**Requested features**

- More regular app updates
- Ability to invite others to manage the box
- See environmental details
- Translate app to German
- Improve German translation


### VPD Chart

[App page](https://appshunter.io/ios/app/vpd-chart/id6470015847)

This app calculates Vapor Pressure Deficit (VPD) using air temperature, relative humidity, and canopy temperature. It offers real-time charting, sensor integration, and educational tools to understand plant growth environments. Organize data by zones and visualize dew point areas.

**Highlights:** VPD calculation, Interactive VPD chart, Sensor integration, Zone organization, Dew point visualization, Grow Timeline

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VPD Chart Plus (monthly) | $3.99 | per month |
| VPD Chart Plus (annual) | $29.99 | per year |


## Frequently asked questions

### Is hey abby free?

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

### Is VPD Chart free?

VPD Chart is free to download, with in-app purchases available.

### Which has better reviews, hey abby or VPD Chart?

VPD Chart is rated higher. hey abby averages 3.4 out of 5 from 107 ratings, while VPD Chart averages 4.5 from 30 ratings.

### Do hey abby or VPD Chart have ads?

Neither hey abby nor VPD Chart shows ads.

### Which is updated more often, hey abby or VPD Chart?

hey abby ships an update every 3 weeks, and VPD Chart every 3 weeks. Most recently, hey abby was updated on October 15, 2026 and VPD Chart on October 14, 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.*