Comparison

Lowell Light and Power vs VPD Chart

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Lowell Light and Power

Democratization of VPD

Free

🔧 Utilities

★ 4.531 ratingsView app →

About

Lowell Light and Power

Features

Read full description

Lowell Light and Power Bill Pay provides you account management at your fingertips. You can view your usage and billing history, make payments on your account and receive special messages from Lowell Light and Power.

About

VPD Chart

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

Read full description

The app calculates VPD using air temperature, relative humidity, and canopy temperature. View real-time VPD values on an interactive chart. Connect sensors for automated readings or manually input data via intuitive sliders and text inputs. Key features: • Interactive VPD chart with manual input • Default crop types • Organize charts by assigning them to different zones • Display spots that share the same VPD value • Zoom in and out of the VPD chart with a two-finger pinch and drag to pan around • VPD Target - long-press the chart to set a target VPD value • Dew point area visualization • Grow Timeline • Sync sensor historical data by importing it from sensor's app, via cloud APIs, or bluetooth • Explore sensor history by panning and zooming Supported bluetooth devices: • AC Infinity Cloudcom B2, A2, B1 • SensorPush: HT1, HT.w, HT.xw • Govee: H5051, H5072, H5074, H5075, H5100, H5101, H5102, H5103, H5104, H5105, H5174, H5177, H5179 • SwitchBot: Meter, Plus, Indoor Outdoor • Ruuvi: RuuviTag and RuuviTag Pro • Inkbird: IBS-TH1, IBS-TH1 Plus, IBS-TH2, IBS-TH2 Plus • ThermoPro: TP351, TP357, TP358, TP359 • VIVOSUN AeroLab THB1S • Shelly BLU H&T • Xiaomi Mijia 2 (LYWSD03MMC) (original and pvvx firmware) Supported devices with API connectivity: • Govee • Pulse • UbiBot • Ecowitt • Tuya • SensorPush Educational benefits: • Interactive Learning: Explore the dynamics of VPD based on changes in temperature and relative humidity by manipulating input sliders and animating the chart • Canopy - Air Temperature Link: Easily visualize and set values by linking canopy temperature to air temperature • Chart Bands Control: Toggle chart bands on/off (dew, under transpiration, prop, veg, flower, over transpiration) for a comprehensive understanding Included: 1 chart with manual input and grow timeline, device data sync & explore, default crops VPD Chart Plus subscription unlocks: • Unlimited charts • Automated VPD calculation by using sensors as the input data source • Background monitoring and Alerts (temperature, RH, VPD) • VPD history timeline, available on sensor-driven VPD charts • Custom crops Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Lowell Light and Power3 screens

VPD Chart4 screens

Verdict

The call

The clearest difference is in-app purchases: Lowell Light and Power at none against VPD Chart's 2. Lowell Light and Power also leads on iOS requirement (11.0 vs 15.1). VPD Chart's advantage is update cadence (every 3 weeks vs every 21 months). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Lowell Light and Power ships an update every 21 months, VPD Chart every 3 weeks. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

Scorecard3 real differences · 7 level

Lowell Light and Power versus VPD Chart: the parameters behind the verdict, then further details
Parameter	Lowell Light and Power	VPD Chart
Price	Free	Free
Rating	—	4.5 (31 ratings) — better
Positive reviews	—	73.7% of reviews
Number of ratings	—	31 — better
Update frequency	Every 21 months	Every 3 weeks — better
Ads	No	No
In-app purchases	No — better	Yes
Monetization	—	Free with in-app purchases
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	11.0 — better	15.1
Further details — not scored
Size	5 MB	49 MB
Age rating	4+	4+
Developer	Daffron & Associates, Inc.	INNOVO DEV S.R.L.

In-app purchases

None

Lowell Light and Power

No in-app purchases

2 purchases

VPD Chart

Subscriptions2

VPD Chart Plus (monthly)3 Days trial$3.991 Month
VPD Chart Plus (annual)3 Days trial$29.991 Year

Questions

Is Lowell Light and Power free?

Lowell Light and Power is free to download, with no in-app purchases.

Is VPD Chart free?

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

Do Lowell Light and Power or VPD Chart have ads?

Neither Lowell Light and Power nor VPD Chart shows ads.

Which is updated more often, Lowell Light and Power or VPD Chart?

Lowell Light and Power ships an update every 21 months, and VPD Chart every 3 weeks. Most recently, Lowell Light and Power was updated on October 27, 2026 and VPD Chart on October 22, 2026.