Comparison

AutoSilent vs VPD Chart

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

Head to head
About

AutoSilent

This app automatically silences your iPhone or iPad during scheduled meetings, at specific locations, or at set times. It seamlessly integrates with your calendar and location services to manage your device's ringer, ensuring you're never disturbed or embarrassed by notifications in inappropriate situations. It can also automatically unmute your device when the event concludes.

Highlights
  • Automatic silencing for calendar events
  • Location-based silencing
  • Scheduled silencing
  • Automatic unmuting
  • Calendar synchronization
  • Customizable silent event criteria
Features
Read full description

AutoSilent automatically mutes your iDevice (iPhone, iPad) during meetings, scheduled times or at selected locations. Comes with 7 days free trial period. After this you may purchase an auto-renewing subscription through an In-App Purchase. If you do not maintain a subscription you will not be able to have premium features, like: Schedule events, Location Events snd Calendar events. • Auto-renewable subscription • 1 month ($1.99) • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. Note: ------ In case of a problem to identify an already purchased subscription, please try first to quit and re-open the app. In case it does not work please click on "Restore Purchases". EULA ------ https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy -------------- http://www.gutherz.org/autosilent/privacy_policy_autosilent.html In the first tab the next silent event that it finds in your iPhone calendars. This tab is not intended to be used to add or modify events. To add new event just open your Calendar application and add/modify your event. AutoSilent will automatically synchronize with your calendars. On first run, make sure to allow AutoSilent to get your current location and allow it to get notifications. AutoSilent synchronizes with your calendars and automatically silents your iDevice during meetings. AutoSilent automatically re-sets your iDevice back to Regular/Ring mode at the end of the meeting. AutoSilent is a location based application. It can detect your current location and mute your iDevice automatically when you are at School or at the University. AutoSilent will set your iDevice back to Regular/Ring mode when you leave those places. Don’t miss an important call because you forget to un mute your phone. Don’t be embarrassed by alerts that go on while you are in a meeting. Let AutoSilent do the job for you. Calendar event is considered silent when: 1. Availability is busy 2. Not a whole day event 3. Event notes do not contain !ring 4. Event notes contain !silent Calendar Tab – This tab shows you the next meeting that AutoSilent will automatically mute your iDevice Locations Tab – Lists locations where AutoSilent automatically mutes your iDevice. You can click on any of the location rows and make modifications. Settings Tab - Calendar Silent: enables or disables mute for calendar events. Location silent: enables or disables mute for Location events. Ring/Silent Notification: Enables or disables notification alerts whenever iDevice changes its mode from mute to un mute and vice versa. Next Silent Event: Specifies the number of days to look forward for the next Silent event in your calendar(s). (Defaults to 30 days) Location Radius: Specifies the radius where AutoSilent checks for location events. (Defaults to 500 meters) Calendar: Selects the calendar to check for calendar events. (Defaults to ALL calendars) Silent Out Of Office: Silence the phone during "Out Of Office" events. Keep Mute Status: When selected AutoSilent will not change your iDevice to ring mode if it was silent before event was started. Only !silent events: AutoSilent will only look for !silent events in your selected calendars. Mute on WiFi network: put _all for all WiFi networks or the WiFi name that will be used by AutoSilent to mute your device once you are connected to that network. AutoSilent will unmute your device once you are disconnected from that network. Battery Disclaimer: Continued use of GPS running in the background can dramatically decrease battery life.

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

AutoSilent4 screens
VPD Chart4 screens

Verdict

The call

The clearest difference is rating: VPD Chart at 4.5 against AutoSilent's 3.5. VPD Chart also leads on review sentiment (74% vs 42%). AutoSilent's advantage is ratings volume (183 vs 30) and iOS requirement (12.0 vs 15.1). On price, update cadence, ads and in-app purchases 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. AutoSilent sells 1 in-app purchase, starting at $1.99 per month and VPD Chart sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

VPD Chart holds the better App Store score, 4.5 against 3.5. That said, the two scores are not equally well evidenced: AutoSilent has 183 ratings behind it against 30, so its average is the more settled of the two. Written reviews point the same way: 42% of AutoSilent's written reviews are positive against 74% of VPD Chart's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 28, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
AutoSilent versus VPD Chart: the parameters behind the verdict, then further details
ParameterAutoSilentVPD Chart
PriceFreeFree
Rating3.5 (183 ratings)4.5 (30 ratings) — better
Positive reviews42.1% of reviews73.7% of reviews — better
Number of ratings183 — better30
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS12.0 — better15.1
Further details — not scored
Size25 MB49 MB
Age rating4+4+
DeveloperNiv GutherzINNOVO DEV S.R.L.

Customer experience

AutoSilent

All ratings183 ratings
Positive62.8%
Neutral6.6%
Negative30.6%
Written reviews178 reviews
Positive42.1%
Neutral12.4%
Negative45.5%

VPD Chart

All ratings30 ratings
Positive86.7%
Neutral3.3%
Negative10.0%
Written reviews19 reviews
Positive73.7%
Neutral0.0%
Negative26.3%

Bugs and requests

AutoSilent

Reported bugs

3 issues
  • Silencing not working as expected
  • Constant notifications/alerts from the app
  • Losing custom settings after updates

Requested features

4 requests
  • Ability to selectively silence contacts/numbers
  • Master on/off switch for easier deactivation
  • More flexible scheduling options (e.g. overnight)
  • Improved integration with iOS Focus mode

VPD Chart

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

AutoSilent

Subscriptions1
  • AutoSilent Premium Features$1.991 Month
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 AutoSilent free?
AutoSilent is free to download, with in-app purchases available.
Is VPD Chart free?
VPD Chart is free to download, with in-app purchases available.
Which has better reviews, AutoSilent or VPD Chart?
VPD Chart is rated higher. AutoSilent averages 3.5 out of 5 from 183 ratings, while VPD Chart averages 4.5 from 30 ratings.
Do AutoSilent or VPD Chart have ads?
Neither AutoSilent nor VPD Chart shows ads.
Which is updated more often, AutoSilent or VPD Chart?
AutoSilent ships an update every 3 weeks, and VPD Chart every 3 weeks. Most recently, AutoSilent was updated on September 28, 2026 and VPD Chart on September 22, 2026.

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